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532608329688WORKSHEET 11 A00WORKSHEET 11 AName: _________________________________________Chapter 11 Worksheet PacketSection 1 Reading Guide (312-317)The Greek philosopher Democritus thought that if you kept cutting something in half, you would eventually end up with a particle that could ______ be cut.The word atom is from the Greek word atomos, meaning “ __________________________”True or false: Aristotle agreed with Democritus’s ideas. __________________Sketch below what Democritus’s idea of an atom may have looked likeWhat is an atom?By the late 1700s, scientists had learned that elements combine in certain _______________ based on mass to form compounds.Which scientist came up with the atomic theory? ________________ What are the three main ideas of the atomic theory? Sketch below what Dalton’s idea of an atom may have looked like5466080-525145WORKSHEET 11 A00WORKSHEET 11 AIn 1897, a British scientist named J.J. Thomson showed that there are small __________ inside the atom; this means that atoms can be divided into even smaller parts.Looking at Figure 3 on page 314, add in the missing information to the diagram What subatomic particle did Thomson discover? ___________What is an electron?What is the name for Thomson’s new model of an atom? __________________________Sketch below what Thomson’s idea of an atom may have looked likeIn your own words, explain what Rutherford’s experiment looked like.5323205-91440WORKSHEET 11 A00WORKSHEET 11 AWhat results did Rutherford see in his experiment? Most particles went through the gold foilSome of the particles were deflected (turned to one side)Some bounced straight backAll of the aboveRutherford proposed that in the center of the atom is a tiny, extremely dense, positively charged part called the __________.Sketch below what Rutherford’s idea of an atom may have looked likeNiels Bohr’s work focused on which subatomic particle? _______________Bohr’s model said that electrons move around the nucleus in certain paths, or __________________________.Sketch below what Bohr’s idea of an atom may have looked likeWhat were the names of two scientists that contributed to the modern atomic theory? Was Bohr’s idea of electrons traveling around in paths correct? _____ According to the current atomic theory, there are regions inside the atom where electrons are like to be found. These regions are called _______________________.Using Figure 8 on page 317 as a guide, label the diagram below226187057785005372735-47625WORKSHEET 11 B00WORKSHEET 11 BAtomic Models Worksheet(Modifiied from ) Directions: Fill in the blanks on the right with the information in the chart below.Word ListatomneutronBohrnucleusDaltonprotonDemocritusRutherforddestroyedsubatomic particleelectronsubstanceselectron cloudThomson4613275207645____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________00____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________More than 2000 years ago, the Greek philosopher __(1)__ proposed the existence of very small, indivisible particles, each of which was called a(n) __(2)__. The theory that such particles existed was supported, much later, by several different scientists. In 1803, a scientist by the name of __(3)__ came up with the atomic theory, which had three points to it:All substances are made of atoms. Atoms are small particles that cannot be created, divided, or __(4)__.Atoms of the same element are exactly alike, and atoms of different elements are differentAtoms join with other atoms to make new __(5)__. It was later proposed that the atom was not indivisible, but is made up of smaller particles, each of which is called a(n) __(6)__. These particles include the negatively-charged __(7)__, the positively-charged __(8)__; and the uncharged __(9)__. The small electrons were discovered by a scientists named __10)__, who created a model called the Plum Pudding model. The larger two particles are present in the __(11)__, or center, of the atom, which was discovered by __(12)__ in his gold foil experiment. The Danish physicist __(13)__ proposed a model of the atom in which the electrons orbit the nucleus without losing energy. He called each possible orbit an electron level. Today, the modern atomic theory suggests that an electron’s position cannot be predicted, but the area where one is likely to be is a(n) __(14)__.5358765-121285WORKSHEET 11 C00WORKSHEET 11 CSection 2 Reading Guide (pages 318-324) Give one example from page 381 that shows just how small atoms areLook at figure 2 on page 319 to complete the information belowElements join in a ____________ ratio according to their masses to form a compound.What type of charge do protons have? _____________________The SI unit used to express the masses of particles in atoms is the __________________ ____________.What type of charge do neutrons have? ________________________Which subatomic particle(s)are found in the nucleus (circle any that are true)ProtonNeutronElectronBoth the proton and the neutron have a mass of about ___ amu, which the mass of an electron is usually thought of as ____ amu.To have a neutral charge, an atom has to have the same number of protons and ________________.Does an atom need to have equal number of protons and neutrons? _____5370195-168275WORKSHEET 11 C00WORKSHEET 11 CWhat is the atomic number? The atomic number is always equal to the number of _______ in an atom; it can be thought of as the identity of an atom.What is an isotope?Look at Figure 4 on page 321. What is different between the two pictures?Each element has a _________ number of isotopes that are found in nature._______________ atoms (isotopes) spontaneously fall apart after a certain amount of time. However, isotopes of an element share _________ of the same chemical and physical properties.What is the mass number?How is the mass number useful tor telling isotopes apart?Read the naming isotopes section on page 323. If I have a sample of Boron with 5 protons, 5 neutrons, and 5 electrons, how would I name this isotope?_____________________________What is atomic mass?How is atomic mass different than atomic number?List the four different forces in atoms and briefly describe them 5349834-77190WORKSHEET 11 D00WORKSHEET 11 DBuilding Atoms worksheet(Modified from Elizabeth Scheidel’s worksheet: )Directions: Below you will find the ten most common elements found in Earth’s crust. The element symbol has been given to you on your left. Using either pages 338-339 in your textbook or a handout of the periodic table, complete the chart below.ELEMENT NAMEATOMIC #ATOMIC WEIGHT / MASSPROTON #ELECTRON #NEUTRON #HHHeHeLiLiCCOONeNe8915406720840Na00Na8915407406640Cl00Cl8915406035040Ne00NeNaNaClClKKAuAu5373370-81915WORKSHEET 11 E00WORKSHEET 11 EIsotope…or New Element?(Modified from Kim George’s worksheet)For each problem you are given a pair of elements. Based on the information about each elements, please determine if they are different elements or isotopes of the same element. Element D has 6 protons and 7 neutronsElement F has 7 protons and 7 neutronsElement J has 27 protons and 32 neutronsElement L has 27 protons and 33 neutronsElement x has 17 protons and 18 neutronsElement Y has 18 protons and 17 neutronsElement Q has 56 protons and 18 neutronsElement R has 56 protons and 82 neutronsElement T has an atomic number of 20 and an atomic mass of 40Element Z has an atomic number of 21 and an atomic mass of 41Element W has 8 protons and 8 neutronsElement V has 7 protons and 8 neutronsElement P has an atomic number of 92 and an atomic mass of 238Element S has 92 protons and 143 neutronsNow, you need to identify each element and give it the proper isotope name.Use page 323 in your textbook for help, and pages 338-339 or a periodic table handoutExample: Element D has 6 protons, which makes it Carbon. Its mass number is 13, so the proper name is Carbon-13Element F: ________________________________Element J: ________________________________Element L: ________________________________Element X: _______________________________Element Y: _______________________________Element Q: _______________________________Element R: ________________________________Element T: ________________________________Element Z: ________________________________Element W: _______________________________Element V: _______________________________Element P: _______________________________Element S: ______________________________ ................
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