The Extraordinary Properties of Water - Notes

Question 1

What atoms make up a water molecule?

Answer 1

1 Hydrogen & 2 Oxygen

Question 2

Because the oxygen attracts more electrons, the oxygen side acts ______ and the hydrogen side acts _________.

Answer 2

Negative, positive

Question 3

The unequal sharing of electrons makes water ______.

Answer 3

Polar

Question 4

True or false?

Water is neutral.

Answer 4

True

Question 5

Formed between a highly electronegative atom of a polar molecule and a hydrogen

Answer 5

Hydrogen bonds

Question 6

One hydrogen bond is _____, but many are _____.

Answer 6

Weak, strong

Question 7

Describe the hydrogen bond between water molecules.

Answer 7

An atom of oxygen bonds with an atom of hydrogen from another molecule.

Question 8

At what temperature does water boil at sea level?

Answer 8

100°C

Question 9

At what temperature does water freeze at sea level?

Answer 9

0°C

Question 10

The boiling temperature of water ______ at higher elevation.

Answer 10

Decreases

Question 11

Attraction between particles of the same substance

Answer 11

Cohesion

Question 12

Water’s high surface tension results from its ______.

Answer 12

Cohesion

Question 13

A film on the water that allows insects to walk on its surface

Answer 13

Surface tension

Question 14

Attraction between two different substances

Answer 14

Adhesion

Question 15

Can water make hydrogen bonds with other substances? If so, give some examples.

Answer 15

Yes. Glass, soil, plant tissue, & cotton

Question 16

Water molecules “towing each other along” when in a thin glass tube is called _______.

Answer 16

Capillary action

Question 17

The amount of heat needed to raise or lower 1g of a substance 1°C

Answer 17

Specific heat

Question 18

Does water resist temperature change?

Answer 18

Yes

Question 19

True or false?

Water can absorb or release large amounts of heat energy with little change in actual temperature.

Answer 19

True

Question 20

Amount of energy to convert 1g of a substance from liquid to gas

Answer 20

Heat of vaporization

Question 21

In order for water to evaporate, hydrogen bonds _______

Answer 21

Must be broken

Question 22

When water evaporates, does it remove a lot of heat with it?

Answer 22

Yes

Question 23

How does the water vapor in the atmosphere help to keep the earth warm?

Answer 23

It collects the heat energy radiated from the sun-warmed surface of the Earth

Question 24

Ice is (More/Less) dense as a solid than as a liquid.

Answer 24

Less

Question 25

Contrast the molecular structures of ice and water.

Answer 25

Water has hydrogen bonds that are constantly being broken and reformed. Ice forms a crystal-like lattice in which molecules stay at a fixed distance.

Question 26

True or false?

Water is usually part of a mixture.

Answer 26

True

Question 27

Substance being dissolved

Answer 27

Solute

Question 28

Substance doing the dissolving

Answer 28

Solvent

Question 29

Is water important for homeostasis?

Answer 29

Yes, very.