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Collin College BIOL 1408 Properties of Water with Answer Key
- Course
- BIOL 1408
- Institution
- Collin College
Collin College BIOL 1408 Properties of Water with Answer Key
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pg. ____ Date ______________________Reflection:
Properties of Water
hydrogen
1. In a water molecule, the hydrogen and oxygen atoms are held together by ___________________ bonds.
2. Draw a water molecule. Label the atoms and the poles (negative and positive ends).
O
H H
dissolve
3. The polarity of water allows it to __________________most substances. Because of this it is referred to as
universal
the ______________________ solvent
_______________________.
cohesion
4. Water molecules stick to other water molecules. This property is called __________________.
positively
5. Hydrogen bonds form between adjacent water molecules because the _________________ charged
negatively
hydrogen end of one water molecule attracts the ______________________charged oxygen end of another
water molecule.
6. Water molecules stick to other materials due to their polar nature. This property is called
adhesion
__________________________.
Surface
7. __________________ tension
_______________________ creates a skin-like surface, which is formed due to the
polar nature of water.
Cold
8. _________________ warm
water is more dense than _________________ warm
water; therefore _________________
cold
water will rise to the surface and _________________ water will sink.
9. Condensation
_______________________ is when water changes from a gas to a liquid.
Evaporation
10. _______________________ is when water changes from a liquid to a gas.
11. Why does ice float?
As water freezes, it expands, meaning the water molecules spread farther apart.
Because the molecules spread farther apart, the ice becomes less dense than
liquid water, so it can now float in water.
12. Which box has a higher density? Explain.
Box A has a higher density. Box A and Box B
both have the same volume (they take up the
same amount of space), but Box A has more
molecules in that same amount of space, so
it is more dense.
13. You place a wax candle in a bowl of water and it floats. What can you infer about the density of the candle?
Water has a density of 1 gm/mL, so you can infer that the wax candle has a
density that is less than 1 gm/mL because the candle floats in the water.
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