Date _____
Properties of Water
Name _______________
Polarity and Hydrogen Bonding
1. If there are 600 water molecules in a glass. What is the total number of hydrogen atoms
in the glass? What is the total number of oxygen atoms in the glass?
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2. Why is water considered to be a polar molecule?
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3. Explain why the oxygen atom in water has a negative charge.
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4. Explain why the two pictures below are incorrect:
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5. What is the name of the bond formed between water molecules? ___________________
6. A student in biology class accidentally spills some vegetable oil on her favorite shirt. She
tries to wash the oil off of her shirt with water but she is unsuccessful. Explain why it
would be impossible to remove an oil stain with just water. Please talk about polarity in
your answer.
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The diagram shows a salt crystal (NaCl) being dissolved in water.
7. In this mixture identify the solute and solvent.
8. Why are the water molecules attracted to Cl- ions and the
Na+ ions in the salt?
Date _____
Properties of Water
Name _______________
Heat Capacity
9. As a substance is heated its molecules vibrate slower / faster.
10. Since water has a very high heat capacity the ocean temperature is very stable / unstable
.
11. During a hot summer day the temperature of the water heats up much faster / slower than
the temperature of the air.
12. Most animals in the ocean are cold blooded which means that their body temperature is
equal to the temperature of the water. What would happen to the animals living in the
ocean is that ocean temperature was to rapidly change?
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Cohesion and Adhesion
13. What is cohesion? ________________________________________________
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14. The object was gently placed
on the surface of a body of
water. Draw in the hydrogen
bonds that allow this object that
is denser to stay afloat.
15. How does waters polar nature account for its high surface tension?
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16. Why does it hurt more to do a belly flop into a pool of water than dive in pencil style?
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If you lay a penny on a flat surface and add several drops of water on the face of the penny,
the water will form a dome that never spills off of the side of the penny.
17. Explain how adhesion and cohesion prevent the
water from spilling over the edge of the penny?
Date _____
Properties of Water
Name _______________
States of Matter
18. Does cold water (not frozen) sink or float in warmer water? Why?
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19. Which state of water forms the most
hydrogen bonds?
20. Which state of water forms the least
hydrogen bonds.
21. What is the temperature range
where water will remain a liquid?
22. At what temperature must you cool
water to allow for a maximum of
hydrogen bonding to take place?
23. Why do cracks in pavement widen over time to become pot holes during the winter?
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24. The average cell is 65% liquid water. Explain why cells usually die when the water
inside of them becomes frozen?
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