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The Properties of Water – An Investigation Post Lab Questions Part 1 – Hold on tight! Hydrogen bonds exist between the positively charged H atom of one water molecule and the negatively charged O atom of another water molecule. Based on your observations, which of the three liquids have the most Hydrogen bonds and which have the least Hydrogen bonds? How do you know?____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________EOC Level Question – Water is essential for life. Its special properties make water the single most important molecule in plant life. Leaves are unable to absorb water during irrigation or during precipitation, and must depend on the root system of the plant to absorb the water. The xylem is the vascular tissue that moves the water from the root system to the leaves to ensure water is present to function as a reactant for the process of photosynthesis. The picture below shows the process of water moving from the roots to the leaves. Which of the following properties of water enables it to move from the roots to the leaves of plants?Water expands as it freezes.Water is an excellent solvent.Water exhibits cohesive behavior.Water is able to moderate temperature.Would it be possible for hydrogen bonds to occur in water if a water molecule was not polar? Explain.______________________________________________________________________________________________________________________________________________________________________The Biology EOC may discuss the process of adhesion in relation to cohesion. We know that cohesion is the attraction of one water molecule to another water molecule, what is the type of bond that describes the attraction of one water molecule to another water molecule? ____________________. Adhesion is the attraction of one water molecule to another substance. In Part 1 of this investigation what was the item to which water was attracted? _____________________.Part 2 – Who’s the hottest? The polarity of water allows for hydrogen bonds to occur. A single hydrogen bond is not very strong, but when there are approximately 1,390,000,000,000,000,000,000 hydrogen bonds (or 1.39 x 1021) in every drop of water, the surface tension of water increases as the amount of water increases. Using your knowledge of hydrogen bonds, explain why even though both processes put your entire body in a pool, belly flopping is much more painful than diving.____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________EOC Level Question – In Jacksonville Beach, the average daytime and nighttime temperatures usually only differ by 7-8°C, while temperatures in Ocala can differ by as much as 12-15°C. 3848100550545Ocala00Ocala3971925169545Jacksonville Beach00Jacksonville BeachWhat role does water play in keeping temperatures from fluctuating dramatically?Water is an acid.Water acts as a buffer.Water is a versatile solvent.Water has a high heat capacity.If you were to heat 1 cup of water and 5 cups of water on a hot plate at the same temperature, which one would boil first? ____________________. Using your knowledge of hydrogen bonds and the polarity of a water molecule, explain why. ________________________________________________________________________________________________________________________________________________________________________Part 3 – Solubility! In the following example, identify the solute, the solvent, and the solution. Ricardo is thirsty after mowing the grass and decides to come inside and make a glass of sweet tea. He adds sugar to the unsweetened prepared tea and stirs the liquid until all the sugar has disappeared from the pitcher. Solute - ____________________ Solvent - _____________________ Solution - ___________________Imagine you were given an unknown dry substance and you added it to water and no matter how much you heated up the water or stirred the unknown substance, it wouldn’t dissolve in the water. What conclusions could you draw about the types of bonds and charges on the substance because it doesn’t dissolve in water?________________________________________________________________________________________________________________________________________________________________________EOC Level Question – All living things need to transport molecules from one place to another in order to carry out necessary life functions. Living things often transport these molecules by dissolving or dissociating them in water and then moving the resulting solution from place to place. What characteristic must a molecule have for it to form a solution in water?It must be at least as small as the polar water molecules.It must contain hydrogen or oxygen to bond to part of the water molecule.It must be at least slightly polar to be able to react with the polar water molecules.It must be covalently bonded in order to form new bonds with the polar water molecules.Part 4 – Temperature v. Density The trend for most objects on earth in relation to density is that the colder they become, the less movement of atoms occurs. This trend is true for water right up until it completes the phase change from liquid to solid because water is most dense at 4°C. Is liquid oil more or less dense than solid water? How do you know? ____________________________________________________________________________________ Is solid oil more or less dense than solid water? How do you know? ____________________________________________________________________________________EOC Level Question – The picture below was taken from the banks of Lake Erie in the winter of 2014. You can see that the exterior of the lake is covered with ice, while the center portion is not. The ice that is found on the exterior of the lake is floating on the water below. Why does the ice float? Water expands as it freezes, allowing in small air bubbles, so it floats.Water expands as it freezes, making it less dense that liquid water, so it floats.When water freezes it becomes polar, and so it will not mix with the non-polar water.When water freezes it becomes non-polar, and so it will not mix with the polar water.How might life be different if solid water was denser than liquid water? Brainstorm how life would be different for the following organisms.Polar bears - ____________________________________________________________________________________Fish that survive in lakes that annually freeze over - ____________________________________________________________________________________ ................
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