Free Printable AP Bio - Water is Conducive to Life

Worksheets

AP Bio - Water is Conducive to Life

Total questions: 20

Worksheet time: 13mins

Name

Class

Date

What does "polar" mean?

A molecule is cold

A molecule has ionic bonds

A molecule has covalent bonds

A molecule has areas of positive and negative charge

This atom in a water molecule has more of a negative charge

Oxygen

Hydrogen

Salt dissolves in water because

The water molecules wiggle between the Na and Cl atoms

Water gets warm and moves around too much

The polar areas of water molecules surround the Na and Cl ions

Water is the universal solvent since it's:

water

such a small molecule

polar

essential to life

Describe COHESION.

Water molecules attracted to other substances.

Water molecules climbing upwards against the force of gravity.

Water molecules dissolving many substances because of its polarity.

Water molecules attracted to other water molecules.

Describe ADHESION.

Water molecules attracted to other substances.

Water molecules climbing upwards against the force of gravity.

Water molecules dissolving many substances because of its polarity.

Water molecules attracted to other water molecules.

Describe CAPILLARY ACTION.

Measure of how difficult it is to break the surface of a liquid.

Water molecules climbing up against the force of gravity.

Water molecules attracted to other substances.

Water molecules dissolving many substances because of its polarity.

A water droplet sticking to a glass is an example of...

Cohesion

Adhesion

Surfactant

Meniscus

Why does ice float?

As water freezes, it expands and its density decreases.

As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.

As water freezes, air becomes trapped between the hydrogen bonds of water molecules.

As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

10.

Which end of the water molecule has a slightly positive charge?

the oxygen end

the hydrogen end

both ends are slightly positive

neither end is positive

11.

Large bodies of water do not quickly fluctuate in temperature. Why?

Water is a solvent.

Water has a high heat capacity.

Water acts as a buffer.

Water is non-polar.

12.

The fact that ice floats on liquid water is due to the fact that water's solid is ___________ than it's liquid form

less polar

more polar

less dense

more dense

13.

What makes a molecule polar?

Equal sharing of valence electrons

Unequal sharing of valence electrons

Stealing of electrons

Temporary charges that come and go

14.

Water is an excellent solvent. Select the property that justifies this statement.

as a polar molecule, it can surround and dissolve ionic and polar molecules

it forms ionic bonds with ions, hydrogen bonds with polar molecules, and hydrophobic interactions with non polar molecules

it forms hydrogen bonds with itself so cohesion is possible

it is liquid and will adhere to many substances

15.

The partial negative charge at one end of a water molecule is attracted to a partial positive charge of another water molecule. What is this type of attraction called?

a polar covalent bond

an ionic bond

a hydration shell

a hydrogen bond

16.

Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?

The insects are light enough so that they do not break the hydrogen bonds holding the water molecules together

The insects actually use their wings to hover slightly above the water's surface and they only skim it with their feet

The insects' feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water's surface

The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

17.

A florist places a bouquet of white carnations in water containing blue dye. After a time, the flowers turn blue. What process helped the carnations to change color?

Specific heat

Surface tension

Cohesion and adhesion of water molecules

Formation of covalent bonds between hydrogen and oxygen molecules

18.

Water makes up approximately 60% of the human body and plays a vital role in regulating body temperature. Which property of water makes it good at regulating temperature?

Water is a good solvent.

Water exhibits strong cohesion.

. Water has an unusual crystalline structure.

Water has a high capacity for heat.

19.

Water has a much higher specific heat than most other covalent compounds. What do you predict might happen if water had a low specific heat instead?

Flooding would occur and animals would be forced to migrate

Harmful organisms living in water would reproduce at a rapid rate

Organisms that are sensitive to changes in temperature would die

Plants would not have enough water to effectively carry out photosynthesis

20.

Many fish and aquatic plants can survive a cold winter because the layer of ice that forms at the top of the lake insulates the water below and prevents the lake from freezing solid. What unique property of water contributes to this effect?

Water absorbs heat when it evaporates and forms a gas

Water expands and becomes less dense when it freezes.

Water molecules completely separate into ions in solutions.

Water forms hydrogen bonds with ions and other polar substances.

100 %

AP Bio - Water is Conducive to Life

Total questions: 20

Worksheet time: 13mins

Similar Resources on Wayground