Water & Life

Question 1

What are the four properties of Water?

Answer 1

Cohesive property, temperature and heat, expansion upon freezing, universal solvent

Question 2

Cohesive property?

Answer 2

Water molecules stick to each other due to hydrogen bonding

Question 3

Adhesion property?

Answer 3

Water molecules stick to other substances

Question 4

Kinetic energy

Answer 4

Energy of motion

Question 5

Thermal Energy

Answer 5

total kinetic energy of particles; depends on temperature and amount of substance

Question 6

Heat

Answer 6

Transfer of thermal energy from one body to another

Question 7

Temperature

Answer 7

Measure of average kinetic energy (how fast particles are moving)

Question 8

Calorie

Answer 8

Unit of heat, the amount needed to raise 1g of water by 1C

Question 9

Specific Heat

Answer 9

Amount of heat required to change the temperature of 1g of substance by 1C

Question 10

Heat of Vaporization

Answer 10

The amount of energy required for liquid water to turn into gas (evaporate)

Question 11

Evaporation

Answer 11

l –> g

Question 12

Expansion Upon Freezing

Answer 12

Water expands as it freezes due to its hydrogen bonding structure (ice is less dense than liquid water)

Question 13

Universal solvent

Answer 13

Water dissolves more substances than any other liquid due to its polarity

Question 14

Solution

Answer 14

a homogenous mixture

Question 15

Solvent

Answer 15

a dissolving agent

Question 16

Solute

Answer 16

whats being dissolved

Question 17

Hydrophilic

Answer 17

An affinity for water

Question 18

Hydrophobic

Answer 18

water-fearing

Question 19

Molar mass

Answer 19

the mass of one mole of a substance (g/mol)

Question 20

Moles

Answer 20

a counting unit for atoms or molecules (e.g. 1 mole - 6.022 x 10^23 particles)

Question 21

Molarity

Answer 21

number of moles of solute per liter of solution

Question 22

Acids

Answer 22

H+ making the conc. more acidic

Question 23

Bases

Answer 23

OH- making the conc more basic

Question 24

PH scale

Answer 24

weighing how acidic or basic a substance

Question 25

Buffer

Answer 25

slows down the transformation between conc