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Water #1

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1. (1 point) Two isotopes of hydrogen are 11H and deuterium,21H. How many protons and neutrons are there in an atom of each isotope?

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2. (1 point) Which ice cube is made of deuterium oxide? Explain why you think so.

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3. (3 points) The size of an atom or molecule is primarily determined by its nuclear charge and number of electrons. Why do hydrogen, 11H, and deuterium, 21H , have roughly the same atomic size?

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4. (1 point) What does the Water and Ice video tell about the relative densities of solid and liquid water?

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5. (1 point) A container is completely filled with cold liquid water. It then is closed and cooled below zero degrees Celsius. What will happen?

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6. (1 point) Thinking about what you have seen in Question 4, why do pavements sometimes crack in the winter, especially in colder climates?

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