The Extraordinary Properties of Water - Notes Flashcards Preview

Honors Biology 1st Semester Exam > The Extraordinary Properties of Water - Notes > Flashcards

Flashcards in The Extraordinary Properties of Water - Notes Deck (29):
1

What atoms make up a water molecule?

1 Hydrogen & 2 Oxygen

2

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

Negative, positive

3

The unequal sharing of electrons makes water ______.

Polar

4

True or false?

Water is neutral.

True

5

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

Hydrogen bonds

6

One hydrogen bond is _____, but many are _____.

Weak, strong

7

Describe the hydrogen bond between water molecules.

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

8

At what temperature does water boil at sea level?

100°C

9

At what temperature does water freeze at sea level?

0°C

10

The boiling temperature of water ______ at higher elevation.

Decreases

11

Attraction between particles of the same substance

Cohesion

12

Water's high surface tension results from its ______.

Cohesion

13

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

Surface tension

14

Attraction between two different substances

Adhesion

15

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

Yes. Glass, soil, plant tissue, & cotton

16

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

Capillary action

17

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

Specific heat

18

Does water resist temperature change?

Yes

19

True or false?

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

True

20

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

Heat of vaporization

21

In order for water to evaporate, hydrogen bonds _______

Must be broken

22

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

Yes

23

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

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

24

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

Less

25

Contrast the molecular structures of ice and water.

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.

26

True or false?

Water is usually part of a mixture.

True

27

Substance being dissolved

Solute

28

Substance doing the dissolving

Solvent

29

Is water important for homeostasis?

Yes, very.