Chapter 3- Water and Life

Question 1

Four properties of water that facilitate an environment for life

Answer 1

• cohesive behavior
• ability to moderate temperature
• expansion upon freezing
• versatility as a solvent

Question 2

Heat intensity

Average kinetic energy

Answer 2

Temperature

Question 3

the energy needed to raise the temperature of 1 gram of water through 1 °C

Answer 3

Calorie

Question 4

The amount of heat that must be absorbed or lost by one gram of substance by 1 degree

Answer 4

Specific heat

Question 5

Heat is _________ when hydrogen bonds break

Answer 5

Absorbed

Question 6

Heat is ________ when hydrogen bonds form

Answer 6

Released

Question 7

Amount of heat a liquid mist absorb for 1 gram to be converted to a gas

Answer 7

Heat of evaporations

Question 8

As a liquid evaporates it’s remaining surface cools

Answer 8

Evaporative cooling

Question 9

At what temperature does water reach it’s greatest density?

Answer 9

4 degrees Celsius

Question 10

A homogenous mixture of two or more substances

Answer 10

Solution

Question 11

Dissolving agent

Answer 11

Solvent

Question 12

The substance dissolved in a solvent

Answer 12

Solute

Question 13

Water is a versatile solvent owing to its ________ of the water molecules, which allows it to form hydrogen bonds easily

Answer 13

Polarity

Question 14

What compounds dissolve in water?

Answer 14

Ironic and polar

Question 15

One mole =

Answer 15

6.02 x 10^23 molecules

Units in grams

Question 16

Number of moles of solute per liter of solution

Answer 16

Concentration

Question 17

H3O+

Answer 17

Hydronium

Question 18

OH-

Answer 18

Hydroxide

Question 19

[H+] [OH+] =

Answer 19

10^-14