Mr. Kneer's Science Fair Page



8th grade SSA Review Assessment1.Maria and Lauren want to learn about how fast a rose bush grows. They choose plants of equal height and each student takes one bush home. They grow their plant inside and to give it 25 mL of water every other day. After one month, the girls noticed different results. ?Maria's PlantLauren's PlantPlant Height on Day 14 centimeters4 centimetersPlant Height on Day 3010 centimeters6 centimetersWhat should the girls have done differently to insure their methods were similar?A. chosen a different plant to work with B. controlled other variables such as how much sunlight the plants got C. recorded the heights of the plants every day of the month D. used better soil with more organic matter in it 2.Javier and Jessica are measuring the water temperature of a stream. Javier records the water temperature as 56°. Jessica tests the water at the same location, but finds that the water temperature is 13°. What is the most likely cause of the different results?A. Javier’s thermometer was in moving water, Jessica’s was in still water. B. Javier’s thermometer was digital, Jessica used a standard thermometer.C. Javier recorded degrees Fahrenheit. Jessica recorded degrees Celsius. D. Javier measured temperature, but Jessica measured volume.3.Earth’s spheres interact in many ways. Which of the following is the BEST example of the hydrosphere and atmosphere interacting?A. A heavy snowfall adds mass to a glacier. B. Polluted air kills several animal species. C. Magma erupts and releases trapped gases. D. Ocean currents influence weather patterns. 4.The cryosphere and biosphere are two components of Earth’s systems. What is one way that the cryosphere and biosphere interact?A. A glacier picks up rock and sediment as it moves down a valley. B. Heavy rains bring an end to a dry period on the African savannah. C. A volcanic eruption destroys the plants on an island. D. A melting glacier provides fresh water for plants and animals in the valley below the glacier. 5.The graphs below show the average temperature range and average precipitation in Denver, Colorado. Which data would you use to make a statement about Denver's climate?A. the average temperature range B. the average monthly precipitation C. the highest values for each of the graphs D. a combination of all the data on the graphs 6.When people talk about the conditions outside, they often confuse the terms weather and climate. What is the difference between weather and climate?A. Weather conditions change daily but climate conditions do not change. B. Weather describes the conditions of the atmosphere and climate describes the pattern of weather over a long period of time. C. Weather describes the conditions of the atmosphere and climate describes the average temperature. D. Climate describes the average precipitation while weather describes the average temperature. 7.Heat energy is transferred through solids, liquids, and gases. How is heat transferred throughout the world’s oceans?A. Convection currents are driven by sunlight warming surface waters, which flow throughout the oceans, distributing energy as heat. B. Sunlight penetrates the ocean’s waters, evenly distributing energy as heat from the surface to the ocean floor C. The warmed atmosphere transfers energy as heat to the rivers and the energy is distributed by conduction to oceans. D. Energy in the form of heat is transferred throughout the ocean by waves and surface currents. 8.Earth has hot, dry regions and cool, wet regions. How does convection contribute to the distribution of heat and moisture across Earth?A. Convection allows the transfer of energy directly from the Sun to Earth’s surface. B. Convection distributes energy as heat throughout Earth’s solid crust, warming the entire planet. C. Convection causes the water vapor in the atmosphere to absorb the energy from warm water all over Earth. D. Convection causes air masses carrying water and heat to rise and fall, all over Earth. 9.Sand dunes can have many shapes and sizes. How is a natural sand dune formed??A. Windblown sand piles up on a mountain. B. Windblown sand is trapped by beach grass or other objects C. Sand is pulled off the beach and into the ocean. D. Animals push sand into small hills as they burrow along a beach. 10.The state of Florida is a peninsula. What type of landform borders the Florida peninsula on three sides?A. a river B. a delta C. a coastline D. a mountain 11.All matter has mass, and gravity is a result of mass. Which statement about mass is correct?A. Mass remains constant regardless of its location. B. Mass depends on the gravitational force acting on it. C. Mass is expressed in a unit known as the Newton (N). D. Mass is a measure of the gravitational force exerted on an object. 12.Isaac wanted to use a model to explain to his class how distance affects gravitational force. He placed one large ball and one small marble at various distances away from each other and then explained the effect of the distance on the force of gravity between them.At which distance, should Isaac have explained that the gravitational force was the strongest between the two marbles?A. 20 cm B. 5 cm C. 122 cm D. 375 cm 13.Hector wrapped a copper wire around a nail and attached the ends of the wire to a battery. What force was responsible for causing the paper clips to attach themselves to the nail?A. magnetic force B. balanced force C. frictional force D. gravitational force 14.Wet floors can sometimes be slippery. What is the reason for this?A. The water increases the friction between the floor and feet. B. The water decreases the fiction between the floor and feet. C. The water produces a new force between the floor and feet. D. The water sets up a magnetic force between the floor and feet. 15.The graph below plots the distance in kilometers traveled by an object over time in hours. What can you conclude from this graph?A. The speed of the moving object remains constant. B. The speed of the moving object increases over time. C. The speed of the moving object decreases over time. D. The speed of the moving object constantly changes. 16.The drawing below shows three different positions of a skier as she descends a snow-packed hill. Which statement about the skier is correct?A. The skier’s kinetic energy is higher at point A than at point B. B. The skier’s kinetic energy is lower at point C than at point B. C. The skier’s potential energy is lower at point A than at point C. D. The skier’s potential energy is higher at point B than at point C. 17.Kalinda did an experiment to study motion. She measured an object moving 20 meters (m) after 2 seconds (s), and she plotted her first data point as shown on the graph below. She also discovered that the object moved at a constant speed. Which of the following data points should Kalinda correctly plot next on her graph?A. 40 meters, 3 seconds B. 30 meters, 5 seconds C. 40 meters, 4 seconds D. 50 meters, 6 seconds 18.According to the law of conservation of energy, what happens to mechanical energy if the potential energy of an object decreases?A. Mechanical energy decreases. B. Mechanical energy increases. C. Mechanical energy remains unchanged. D. There is no mechanical energy. 19.Flowering plants are complex organisms composed of various structures that work together to perform specific functions. What type of structure is formed by a group of similar cells that work together to perform a specific function?A. an organism B. an organ C. a tissue D. an organ system 20.Cells carry out all of the life functions. Which of the following identifies the units that make up cells?A. organelles and organ systems B. organs and organelles C. atoms and tissues D. atoms and molecules 21.An important characteristic for cells is the ability to maintain homeostasis. Which of the processes below helps to regulate the amount of materials inside cells?A. elimination of wastes B. locomotion C. cell division D. using energy 22.The cell membrane constantly moves materials into and out of the cell to help the cell maintain homeostasis. Which word is best used to describe what happens as a result of homeostasis?A. growth B. change C. stability D. reproduction 23.Lucia was looking at cells with a microscope. She knows the cells are classified as either plant cells or animal cells. How can she confirm?that these cells are plant cells?A. Observing a small vacuole in the center of the cells. B. Observing a cytoplasm that contains lysosomes. C. Observing a cell membrane surrounding the entire cell. D. Observing a cell wall outside of the cell membrane. 24.Helena wrote the names of organelles on index cards. She then wrote the functions of the organelles on other index cards. Which of the following is a correct pair between the name and function of organelles?A. mitochondrion: directs activities in the cell B. ribosome: makes proteins C. nucleus: supplies energy for the cell D. cell wall: stores water and other liquids 25.The body absorbs nutrients through the small intestines. The blood transports these nutrients to every cell in the body. The blood also carries oxygen to every cell. The cells use the nutrients and oxygen to supply the energy the body needs. What three body systems are working together in this situation?A. nervous, digestive, and circulatory systems B. digestive, circulatory, and excretory systems C. respiratory, circulatory, and digestive systems D. circulatory, immune, and respiratory systems 26.Emilio stepped on a thumbtack with his bare foot. He yelled and immediately jerked his leg. Which two systems were responsible for the way Emilio responded?A. nervous and musculoskeletal B. digestive and respiratory C. circulatory and musculoskeletal D. nervous and circulatory 27.Viruses, bacteria, fungi, and parasites are types of infectious agents that may infect the human body and cause disease. How do bacteria, fungi, and parasites differ from viruses?A. Bacteria, fungi, and parasites are all smaller than viruses. B. Bacteria, fungi, and parasites are not microscopic organisms. C. Bacteria, fungi, and parasites all cause diseases that be treated with antibiotics. D. Bacteria, fungi, and parasites are all organisms, but viruses are not. 28.Trichinosis is a disease that can be spread to humans when raw or undercooked pork is eaten. The disease is caused by a roundworm that lives within the body of a pig. What type of infectious agent causes trichinosis?A. bacterium B. fungus C. parasite D. virus 29.Four kingdoms are included in the domain Eukarya. On what basis are organisms classified into this domain?A. presence of a cell wall B. presence of heredity material C. presence of cell organelles D. presence of a single-cell 30.An organism is multi-cellular, cannot move about freely, lives on land, and decomposes other organisms for food.?Into which kingdom would this organism be classified?A. Fungus B. Plant C. Protist D. Archaea 31.Darren conducted an experiment on the effect of different types of drinks on athletic performance. He gave milk to one group of runners, water to another group of runners, and a low-sugar sports drink to a third group of runners. He timed how long it took each group to run 100 meters and then averaged each group’s times. He repeated the experiment three times and compiled his results in the table below. BEVERAGES AND THEIR EFFECT ON RUNNING TIMESBEVERAGETRIAL 1TRIAL 2TRIAL 3milk13 sec12 sec12.5 secwater12 sec12.5 sec12 secsports drink11.5 sec12 sec12 secWhich of the following reasons best explains why Darren repeated his experiment?A. He was trying to obtain different experimental results. B. He did not perform the experiment correctly the first two times. C. He wanted to insure that his results were more reliable. D. He knew that all experiments should be performed exactly three times. 32.Cara read an article on why repetition and replication are so important, but she did not understand the difference between them. Which of the following best explains the two terms?A. Repetition is when a scientist conducts an experiment the first time; replication is when the scientist conducts the experiment again after a few years. B. Repetition is when a scientist does the same experiment a number of times; replication is when other scientists reproduce a scientist’s experiment. C. Repetition is when a scientist publishes in more than one scientific periodical; replication is when another scientist reproduces another scientist’s results. D. Repetition is when a scientist commits an error in an experiment the first time and must repeat it; replication is when a scientist repeats an experiment to make sure it is valid. 33.Models can help answer some, but not all, scientific questions. Which scientific question below would be best answered by using a model?A. How do wolves communicate with each other? B. How does temperature affect the rate of water evaporation? C. How do the positions of the sun and the tilt of Earth cause seasons? D. What insect-repelling chemicals are found in the wood of redwood trees? 34.A model can represent an object, system, or process. Why do all models have limitations?A. because all models are two-dimensional B. because a model includes every factor that affects it C. because a model is smaller than the thing it represents D. because a model is never exactly the same as the thing it represents 35.Scientists began exploring the ideas that make up the current atomic theory more than 2,500 years ago. Since that time, many models of the atom that were once accepted by scientists have been abandoned and replaced. Why have atomic models changed over time???A. A model is abandoned when it is discovered to have limitations. B. New models have been developed as new information is discovered. C. The discovery of each new element requires the development of a new atomic model. D. Scientists discovered that models do not provide a useful way to show or explain scientific concepts. 36.At one time, fungi, like mushrooms, were classified in the same kingdom as plants. Today, fungi are classified in their own kingdom. Which statement best summarizes why fungi and plants are now classified in separate kingdoms?A. The discovery of new evidence led to a reclassification of fungi. B. Advancements in technology showed that fungi and plants are closely related. C. The plant kingdom was getting too large, so scientists divided it into two kingdoms. D. Plants and fungi both contain cell walls and share more characteristics than separate them. 37.Which best explains the difference between a scientific theory and a scientific law?A. A law is developed by scientists; a theory is developed by engineers. B. A law is based on evidence; a theory is based on ideas. C. A theory can become a law; a law cannot become a theory. D. A theory explains a set of observations; a law describes a pattern in nature. 38.Scientists in all branches of science have developed scientific theories. Which of the following statements is true about all scientific theories?A. Scientific theories are not widely accepted when they are first developed. B. Scientific theories are based on large amounts of evidence. C. Scientific theories will become scientific laws if enough scientists support them. D. Scientific theories are based on the work of individual scientists. 39.Consider the following hypothesis: “The time it takes for sugar to dissolve in water depends on the temperature of the water.” Which of the following is the test (independent) variable for an experiment that would be designed based on the hypothesis?A. the amount of sugar placed in the water B. the temperature of the water in which the sugar is placed C. the type of sugar placed in the water D. the time required for the sugar to dissolve in the water 40.Kaylee reads an article that states that the frequency of chirping by crickets is related to the temperature of their environment. She wants to conduct an experiment to see if this is true. Kaylee states this hypothesis: Crickets chirp more frequently when the temperature of their environment increases. What is the outcome (dependent) variable in Kaylee’s experiment?A. temperature of environment B. frequency of chirpingC. number of crickets D. type of cricket41.Much of the world’s tropical rain forests have disappeared due to human activities. By the end of the 1990s, only about 5 percent of India’s original forests were still standing. Which of the following is a potential effect of this deforestation?A. increased animal habitats B. decreased global temperatures C. decreased oxygen in the air D. increased biodiversity 42.Water quality is a measure of the health of?water supplies used for drinking and other important activities. Which human activity most directly affects water quality?A. driving cars B. fertilizing crops C. fishing D. powering homes 43.Certain rocks contain minerals that are easily dissolved by water. This is why rain, especially acid rain, can break down rock. What process in the rock cycle does this demonstrate?A. chemical weathering B. mechanical weathering C. metamorphism D. pollution 44.Imagine a metamorphic rock that has been subjected to intense heat and pressure. Over time, it gets pulled underground as part of a tectonic plate that is sinking beneath another plate along a convergent boundary. The rock melts as it goes deeper; then the molten rock rises up and seeps out of a crack in the ocean floor and hardens. What type of rock is it now?A. clastic B. igneous C. metamorphic D. sedimentary 45.The illustration shows layers of rock along a fault line. In which sequence are the geologic features arranged in order, from oldest to youngest?A. Layer 1, Rock 2, Rock 1, Fault B. Rock 2, Layer 1, Rock 1, Fault C. Rock 2, Rock 1, Layer 1, Fault D. Rock 1, Rock 2, Layer 1, Fault 46.The diagram shows the rate of decay of potassium-40, a radioactive element. Imagine two rocks. One rock contains nearly all of its original potassium-40. In a second rock, most of the potassium-40 has decayed. Which statement about the first rock is true?A. It is a metamorphic rock. B. It is harder than the second rock. C. It is younger than the second rock. D. It is older than the second rock. 47.The two main types of lithospheric plates are oceanic plates and continental plates. What happens along a convergent boundary between an oceanic plate and a continental plate?A. The two plates push against each other, producing a fault-block mountain. B. The two plates pull away causing earthquakes to occur in the middle of the ocean. C. The oceanic plate is subducted beneath the continental plate. D. The continental plate is subducted beneath the oceanic plate. 48.Tectonic plates slide past each other at a transform boundary. Often, the plates get stuck and pressure builds up. Eventually, the plates snap free and release a large amount of energy. What event is being described here?A. a tsunami B. a storm surge C. an earthquake D. an erupting volcano 49.The Sun’s energy arrives as radiation on Earth.? When Hector was at the beach, he especially enjoyed the warmth of the Sun. Which part of the electromagnetic spectrum would be most responsible for Hector getting a sunburn?A. gamma radiation B. infrared radiation C. ultraviolet radiation D. microwave radiation 50.Visible light is made up of a spectrum of many different colors as shown in the illustration below. Which color of visible light has the longest wavelength in nanometers (nm)?A. blue B. red C. violet D. yellow 51.Kareem told his friend about the beautiful rainbow he saw just after a rainstorm. Kareem then explained to his friend how a rainbow forms. What was Kareem’s explanation?A. The light waves were refracted by moisture in the air and separated into colors. B. Tiny droplets of water reflected the light waves that struck them. C. Light traveled faster after the rainstorm because of the moisture in the air. D. The brightness of light increased as the waves passed through tiny droplets of water. 52.Light that is reflected off of objects can be detected by our eyes. This is why you can see your image in a mirror. Why can’t you see your image reflected off of a wall?A. Your eyes detect all of the reflected light. B. A wall absorbs all of the light that strikes it. C. Light waves do not travel far after striking an object such as a wall. D. Not all of the light that reflects off of a wall is directed toward your eyes. 53.The following equation illustrates the chemical reaction that occurs in a plant.???????????? ? water + carbon dioxide + light energy = sugar + oxygenBased on the law of conservation of energy, what happened to the light energy in the reaction?A. It was destroyed. B. It was produced by the plant. C. It was changed into oxygen gas. D. It was converted into chemical energy stored in the sugar. 54.Katrina replaced the batteries in her camera with rechargeable ones. Later as she was recharging the batteries, Katrina told her mother “I am creating energy so that I can use these batteries again!” What was Katrina actually doing?A. removing energy B. repairing energy C. destroying energy D. transforming energy 55.Melinda was heating a pot of water on the stove. She had 1.0 L of water at 90 °C, and she added 1.0 L of water at 10 °C from the tap. What was the temperature of the water once it was mixed togetherA. 50 °C because the cold water adds energy to the hot waterB. 100 °C because the temperatures would add togetherC. 50 °C because energy travels from the hot to the cold water.D. 80 °C because the temperatures would subtract56.As a rule, what happens when energy as heat flows between two objects at different temperatures?A. The temperatures of both objects decreases. B. The temperatures of both objects increases. C. The temperatures of both objects do not change. D. The temperatures of both objects change until they are both the same. 57.A population of deer lives in a warm climate. Construction of a highway causes the deer population to be divided into two separate groups. Many of the deer separated from the original environment move into a mountain area that has a colder climate. What will most likely happen over time to the deer population that lives in the mountains?A. Within two generations, all of the mountain deer will have thin fur. B. After many generations, most of the mountain deer will have thick fur. C. The deer population in the mountains will immediately go extinct. D. The deer population in mountains will never adapt to the new environment. 58. Many of the ideas Darwin used to develop his theory of evolution by natural selection were based upon his observations of birds, tortoises and other animals living in the Galápagos Islands. The illustration below shows four different kinds of birds and identifies the type of food each eats. What inference can be made about these birds?A. The birds make the same kind of nests. B. The birds depend upon the same food supply. C. Each bird is adapted to eat a particular type of food. D. Each bird is the only animal species in its environment. 59.Every organism requires a set of instructions that specifies its traits. This information is carried within the cells of the organism. Which of the following best describes hereditary information in eukaryotic cells?A. Genes are made up of chromosomes. Chromosomes and genes are found in the cell’s cytoplasm. B. Chromosomes are made up of genes. Chromosomes and genes are found in the cell’s cytoplasm. C. Genes are made up of chromosomes. Chromosomes and genes are found in the cell’s nucleus. D. Chromosomes are made up of genes. Chromosomes and genes are found in the cell’s nucleus. 60.Some organisms reproduce sexually and have two parents. How does the genetic information of a new organism produced through sexual reproduction compare to the genetic information of its parents?A. It is an exact copy. B. It is completely different. C. It is opposite from its parents. D. It is a blend of the genetic information of its parents. 61.This pedigree chart shows how a trait is passed on in a family. Based on this chart, which two individuals have “the trait”?A. two sisters B. the father and the mother C. the grandfather and a granddaughter D. the grandmother and a grandson 62.For a particular trait, B is dominant to b. Which of the following genetic crosses would be expected to result in 50% of the offspring showing the phenotype of the dominant allele and 50% showing the phenotype of the recessive allele?A. BB x Bb B. Bb x Bb C. Bb x bb D. bb x bb 63.Two of the types of relationships organisms can have are called mutualism and parasitism. Which of the following best compares these two types of relationships?A. In mutualism, one organism benefits; in parasitism, two organisms benefit. B. In mutualism, two organisms benefit; in parasitism, one organism benefits. C. In mutualism, one organism is harmed; in parasitism, two organisms are harmed. D. In mutualism, two organisms are harmed; in parasitism, one organism benefits. 64.There are many different factors in ecosystem that can limit population sizes. Which of the following lists two limiting factors that are due to interactions between living things?A. water supply, hours of daylight B. parasitism, predation C. air temperature, food supply D. size of habitat, climate 65.The diagram below shows a mangrove food web.????? MANGROVE FOOD WEB Which pair of organisms in this food web competes for food?A. mangrove leaves and bacteria B. prawns and snails C. small fish and phytoplankton D. pelicans and snails 66.Scientists recorded the size of a population of house finches in a forest ecosystem from the years 1995 to 2005. The graph below shows the information that was recorded.??????????????????????????? POPULATION OF HOUSE FINCHES IN AN AREA What change in the limiting factors in the ecosystem could have caused the population change that occurred between 2001 and 2002?A. food supply increased B. water supply increased C. number of nesting sites increased D. disease increased 67.Panthers used to live all over the United States, but they moved out of areas as humans developed cities. Now, panthers are an endangered species that is found only in Florida. What limiting factor has most impacted the panther population?A. disease B. predation C. parasitism D. space 68.Food webs contain different kinds of organisms. How are all of the decomposers in a food web similar?A. They are all large animals that eat only consumers. B. They are all green plants. C. They all eat plants to get energy. D. They all get energy by breaking down the remains of organisms. 69.Feeding relationships in an ecosystem are shown in a food web. Which best summarizes the relationship between producers and consumers in any food web?A. Consumers get energy from producers. B. Producers and consumers both get their energy from plants.C. Producers and consumers both get their energy directly from the Sun.D. Consumers make their own energy by decomposing producers. 70.The diagram below shows a marine food web. ????? ARCTIC MARINE FOOD WEB Which term best describes the krill shown in this food web?A. producer B. decomposer C. primary consumer D. secondary consumer 71.Caleb wants to know how salt affects the boiling point of water. What is the best way for Caleb to collect data to answer this question?A. Bring 1 liter of water to a boil, then add 1 gram of salt and observe any changes. B. Add 1 gram of salt to 1 liter of water and time how long it takes for the water to boil. C. Add 1 gram of salt to 1 liter of water and leave a second liter free of salt; time how long it takes for each to boil. D. Bring 1 liter of water to a boil, then add another liter of water and see how many bubbles form. 72.Juan conducts an experiment to test his hypothesis that ants are more likely to eat food that is sweet than food that is salty. Juan conducts his experiment by watching three groups of 10 ants as they move toward different foods and records his observations in the graph below.????????? Which of the following best describes Juan’s results?A. The results prove that Juan’s hypothesis is wrong. B. The results support Juan’s hypothesis. C. The results prove that Juan’s hypothesis is correct. D. The results fail to support Juan’s hypothesis. 73.Owen is reading a study about reactions to a new medication. Using a scale from 1 to 10, (with 10 being the most severe level of a symptom) doctors are monitoring a group of people who took the medication versus a group of people who did not take the medication. Chart of Severity Level of Symptoms SymptomTest Subjects’ LevelControl Subjects’ LevelHives71Itching54Low Energy22Thirst51What is the MOST DIRECT application of the data from the control subjects?A. You can use the data from the control subjects to figure out which symptoms are the easiest to treat.B. You can use the data from the control subjects to figure out that some of the symptoms may not be related to the medicine. C. You can use the data from the control subjects to figure out the exact cause of the symptoms. D. You can use the scores of control subjects to figure out that the test subjects are exaggerating the symptoms. 74.The Andromeda Galaxy is about one million light years from Earth. This galaxy is the most distant object in space that can be seen with the unaided eye. Based on this information, what can you infer about the Andromeda Galaxy?A. The galaxy is one of the newest parts of the solar system. B. The galaxy is closer to Earth than all the other stars. C. To an observer on Earth, the galaxy appears brighter than the sun. D. To an observer on Earth, the galaxy appears as it did one million years ago. 75.Objects in outer space include planets, stars, and galaxies. Which of the following objects is farthest from Earth?A. Triangulum Galaxy B. Neptune C. North Star D. Sun 76.Marlee uses a telescope to observe a red star. What does its color tell her about the star???A. the star’s age B. the star’s surface temperature C. the star’s distance from Earth D. the star’s location relative to other stars 77.Eduardo looks at stars through his telescope. He says that the star Sirius is brighter than the star Rigel. In reality, Rigel has a greater absolute brightness than Sirius. What can explain Eduardo’s observation?A. Sirius is much closer to Earth than Rigel. B. Rigel is much closer to Earth than Sirius. C. Sirius is a hotter star than Rigel. D. Rigel is a hotter star than Sirius. 78.The moon has many more impact craters than Earth. Which of the following gives the best explanation for the moon having more craters than Earth?A. The moon has no atmosphere. B. The moon orbits between Earth and the sun. C. The moon rotates much slower than Earth does. D. The moon has one side facing away from Earth at all times 79.An important factor in determining the gravitational field of a planet is the planet’s mass. The chart below shows the masses of the planets. MASSES OF THE PLANETSPlanetMass (kg)Venus4.87 x 1024Earth5.97 x 1024Mars6.42 x 1023Jupiter1.90 x 1027Saturn5.68 x 1026 On which of the following planets would a person weigh the least?A. Jupiter B. Mars C. Saturn D. Venus 80.Ping’s class is studying the Sun/Moon/Earth system. He studies the diagram of the Sun, Moon, and Earth shown below.? What event is shown in the diagram?A. solar eclipse B. lunar eclipse C. full moon D. winter solstice 81.Sonali's class is learning about the Moon and its gravity. Which Earth feature occurs because of the moon's gravity?A. tides B. seasons C. eclipses D. day and night 82.Elsa used water to make ice cubes. She then placed some ice cubes in a glass that contained rubbing alcohol. In the glass, the ice cubes sank. What can you infer from this information?A. The ice cubes changed their density. B. Water has the same density as alcohol. C. Water has a greater density than alcohol. D. Alcohol has a greater density than the ice cubes. 83.The table below lists the density of various liquids.????? DENSITY OF LIQUIDSLiquidDensity (g/mL)Corn syrup1.38Hexane0.66Rubbing alcohol0.79Water1.00Assuming that you have 100 mL of each, which liquid would have the greatest mass?A. corn syrup B. hexane C. rubbing alcohol D. water 84.Melinda gathered the following tools to measure the physical properties of a solid substance: a balance, a beaker, a hot plate, a magnet, a metric ruler, and a thermometer.Which of the following physical properties CANNOT be measured using the tools Melinda gathered?A. density B. magnetism C. thermal conductivity D. electrical conductivity 85.Physical properties can be used to classify and compare substances. The illustration below shows a physical property that is being investigated using different materials. What physical property is most likely being investigated in this illustration?A. magnetism B. melting point C. thermal conductivity D. electrical conductivity 86.Michelle drew an illustration of the three states of matter. The illustration below shows what she drew. If Michelle replaced the numbers with labels identifying the correct state of matter, which of the following would she use?A. 1 ? solid; 2 ? liquid; 3 ? gas B. 1 ? gas; 2 ? liquid; 3 ? solid C. 1 ? liquid; 2 ? solid; 3 ? gas D. 1 ? liquid; 2 ? gas; 3 ? solid 87.Jessica did an investigation about the states of matter. As part of the investigation, Jessica wanted to change a liquid into a solid. What must she do to bring about this change in state?A. Place the liquid in a different container. B. Stir the liquid as quickly and thoroughly as possible. C. Increase the energy of the liquid so that its particles move faster. D. Remove energy from the liquid so that its particles slow down. pounds can be found everywhere and have many different properties. What do all compounds have in common?A. The have the same color. B. The have the same melting point. C. They can be broken down into simpler substances. D. They cannot combine with one another to form more complex substances. 89.An element is classified as a “pure substance”. What is the reason for this classification?A. An element contains only one type of particle. B. An element can combine with another element. C. Different elements have different properties. D. There are many ways that elements can combine. 90.The illustration below shows a chemical at four different temperatures. The chemical is a liquid at temperature 1, a gas at temperatures 2 and 3, and a solid at temperature 4. At which temperature is a reaction most likely going to be slowest?A. temperature 1 B. temperature 2 C. temperature 3 D. temperature 4 91.Fireflies emit flashes of light because of chemical reactions, which occur in their abdomens. The rate of the chemical reactions determines the rate at which fireflies flash. As the reactions occur faster, the fireflies flash quicker. What can you infer about fireflies?A. Fireflies flash faster during colder weather. B. Fireflies flash slower during colder weather. C. Temperature does not change the rate at which fireflies flash. D. Some fireflies flash faster and some flash slower during colder weather. 92.Cory read that the temperature influences the rate of biochemical reactions in insects. He hypothesized that as the rate of reactions increased, the cicadas would “sing” more. So he decided to perform an experiment. He measured the temperature and recorded the sounds of cicadas every three hours for an entire day. The graph below shows the temperatures he measured. TEMPERATURE IN CORY’S BACKYARD FOR ONE DAYLooking at his temperature data, when did Cory most likely record the most cicada noise?A. around 6 a.m. B. around 1 p.m. C. around 3 p.m. D. around 12 a.m. 93.Which of the following is most likely evidence of a chemical change?A. An object gets smaller. B. An object changes state. C. A substance gives off heat and light. D. A substance no longer occupies the same volume. 94.Dry ice changes from a solid directly into a gas at room temperature. The process of a change of state from a solid to a gas is called sublimation. What does sublimation demonstrate?A. a chemical reaction B. a physical change C. a chemical change D. a new substance 95.All organisms require energy to carry out the processes that keep them alive. Which of the following is a process that organisms use to obtain the energy they need from food?A. cellular respiration B. chemosynthesis C. photosynthesis D. transpiration 96.The word equation below summarizes a process that organisms use to obtain energy from food.Glucose + Oxygen ? Carbon dioxide + Water + EnergyWhat process is represented by the equation?A. cellular respiration B. decomposition C. photosynthesis D. cellular transpiration 97.During photosynthesis, plants use the energy in sunlight to drive a chemical reaction. What happens to the light energy that is used to carry out photosynthesis?A. It is given off as green light by the leaves of the plant. B. It is used up and destroyed during the chemical reaction. C. It is changed into matter that is used to make new leaves. D. It is converted into chemical energy that is stored in glucose and oxygen. 98.Food chain show the flow of energy in an ecosystem. How does a food chain illustrate the law of conservation of energy?A. It shows how energy stored in food moves from one organism to another. B. It shows how sunlight is converted into the matter making up organisms. C. It shows that the energy used by plants for photosynthesis disappears. D. It shows that energy is destroyed by the last animal in the chain. 99.Hector demonstrated a process that he learned in science class. He poured a small amount of sugar into a cup of water and then stirred it until the sugar disappeared. Which process did Hector demonstrate?A. how to separate components of a solution B. how substances dissolve in liquids to produce a pure substance C. how two pure substances can be combined to form a solution D. how dissolving a substance in liquids is an example of a chemical reaction 100.Both a pizza and air are examples of mixtures. All mixtures share certain properties. Which of the following is a property that all mixtures share?A. Each component in a mixture retains its chemical properties. B. The components in a mixture are chemically combined. C. The components in a mixture cannot be separated through physical methods. D. Each component in a mixture is visible and easily distinguishable from the others. ................
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