Chapter 2.2 - Properties of Water

Question 1

What are the five properties of water?

Answer 1

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

Question 2

What is hydrophilic?

Answer 2

Dissolves in water

Question 3

What is hydrophobic?

Answer 3

Does not dissolve in water

Question 4

What substances are hydrophilic?

Answer 4

• Ionic

- Polar covalent

Question 5

What substances are hydrophobic?

Answer 5

-Nonpolar covalent

Question 6

Why are ionic substances soluble?

Answer 6

Poles of H2O molecules separate them into ions

Question 7

Why are polar covalent substances soluble?

Answer 7

Because of the interactions of poles with water poles

Question 8

Why are non polar covalent substances non-soluble?

Answer 8

Due to lack of poles

Question 9

Why is water the universal solvent?

Answer 9

So many substances dissolve in it

Question 10

What is a solute?

Answer 10

Substance that dissolves in a solvent

Question 11

Specific heat

Answer 11

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

Question 12

What is evaporative cooling?

Answer 12

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

Question 13

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

Answer 13

Solid to liquid, liquid to gas

Question 14

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

Answer 14

Gas to liquid, liquid to solid

Question 15

How does absorbed energy change the state of water?

Answer 15

It breaks hydrogen bonds of water molecules

Question 16

What is heat of fusion?

Answer 16

Energy required to change water from solid to liquid

Question 17

What is heat of evaporation?

Answer 17

Energy required to change water from liquid to gas

Question 18

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

Answer 18

energy; water temperature

Question 19

Why does ice float?

Answer 19

Ice is less dense than water

Question 20

Why is ice less dense than water?

Answer 20

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

Question 21

What would happen if ice didn’t float?

Answer 21

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

Question 22

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

Answer 22

bottom feeding organisms

Question 23

What is cohesion?

Answer 23

Attraction between like substances

Question 24

Why does cohesion occur in water?

Answer 24

Due to hydrogen bonding between water molecules

Question 25

Strong cohesion between water molecules = ______

Answer 25

high surface tension

Question 26

What is adhesion?

Answer 26

Attraction between unlike substances

Question 27

Why does adhesion occur in water?

Answer 27

Attraction of poles to other polar substances

Question 28

Why can a wet finger pick up a pin?

Answer 28

Water adheres to skin and pin

Question 29

What is capillary action?

Answer 29

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