Chapter 2.2 - Properties of Water Flashcards Preview

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Flashcards in Chapter 2.2 - Properties of Water Deck (29):
1

What are the five properties of water?

1. Water is an excellent solvent
2. Water has a high specific heat capacity
3. Ice floats
4. Water has strong cohesion and high surface tension
5. Water has strong adhesion

2

What is hydrophilic?

Dissolves in water

3

What is hydrophobic?

Does not dissolve in water

4

What substances are hydrophilic?

-Ionic
-Polar covalent

5

What substances are hydrophobic?

-Nonpolar covalent

6

Why are ionic substances soluble?

Poles of H2O molecules separate them into ions

7

Why are polar covalent substances soluble?

Because of the interactions of poles with water poles

8

Why are non polar covalent substances non-soluble?

Due to lack of poles

9

Why is water the universal solvent?

So many substances dissolve in it

10

What is a solute?

Substance that dissolves in a solvent

11

Specific heat

Degree in which substance changes temperature in response to a change in heat

12

What is evaporative cooling?

Water evaporates to take large amount of heat and cool down the object in which it's on

13

What are the physical state changes of water in which energy is absorbed?

Solid to liquid, liquid to gas

14

What are the physical state changes of water in which energy is released

Gas to liquid, liquid to solid

15

How does absorbed energy change the state of water?

It breaks hydrogen bonds of water molecules

16

What is heat of fusion?

Energy required to change water from solid to liquid

17

What is heat of evaporation?

Energy required to change water from liquid to gas

18

Heat of fusion/evaporation change the ______ in water but not the _______

energy; water temperature

19

Why does ice float?

Ice is less dense than water

20

Why is ice less dense than water?

Weak hydrogen bonds between molecules become rigid and form crystal that keeps molecules separated

21

What would happen if ice didn't float?

The ice would sink and remain frozen due to insulating protection of water above

22

If ice didn't float, it would have an intense effect on _____

bottom feeding organisms

23

What is cohesion?

Attraction between like substances

24

Why does cohesion occur in water?

Due to hydrogen bonding between water molecules

25

Strong cohesion between water molecules = ______

high surface tension

26

What is adhesion?

Attraction between unlike substances

27

Why does adhesion occur in water?

Attraction of poles to other polar substances

28

Why can a wet finger pick up a pin?

Water adheres to skin and pin

29

What is capillary action?

When water adheres to walls of tubing/absorbent solids to rise up/creep through