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Properties and importance of water

Total questions: 24

Worksheet time: 40mins

Name
Class
Date
1.
Water is essential for life. Its special properties make water the single most important molecule in plant life. Which of the following properties of water enables it to move from the roots to the leaves of plants?
a)
Water expands as it freezes.
b)
Water is an excellent solvent.
c)
Water exhibits cohesive behavior.
d)
Water is able to moderate temperature.
2.
Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?
a)
Water is an acid.
b)
Water is a versatile solvent.
c)
Water has a high heat capacity.
d)
 Water acts as a buffer.
3.
Why does ice stay at the top of oceans instead of sinking to the bottom?
a)
 Ice is colder than liquid water.
b)
Ice is less dense than liquid water.
c)
Ice is more dense than liquid water.
d)
Ice is warmer than liquid water.
4.
Water is often called the "universal solvent" because many substances can be dissolved in water. What property of water allows it to be such a versatile solvent? 
a)
purity
b)
polarity and cohesion
c)
high heat capacity
d)
expansion upon freezing
5.
 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?
a)
The insects are light enough so that they do not break the hydrogen bonds holding the water molecules together
b)
The insects actually use their wings to hover slightly above the water's surface and they only skim it with their feet
c)
The insects' feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water's surface
d)
The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
6.
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?
a)
Water is a good solvent.
b)
Water exhibits strong cohesion.
c)
. Water has an unusual crystalline structure.
d)
Water has a high capacity for heat.
7.
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?
a)
Flooding would occur and animals would be forced to migrate
b)
 Harmful organisms living in water would reproduce at a rapid rate
c)
Organisms that are sensitive to changes in temperature would die
d)
Plants would not have enough water to effectively carry out photosynthesis
8.
 Which of the following characteristics of water is not a result of hydrogen bonding?
a)
adhesive strength
b)
capillarity
c)
cohesive strength
d)
All of the above are a result of hydrogen bonding.
9.
Water is a universal solvent because it...
a)
It can be found anywhere
b)
It freezes when it gets cold
c)
floats when frozen
d)
Dissolves most substances
10.
Which statement explains why water molecules stick together?
a)
both sides are negative
b)
one side has a positive charge and the other side has a negative charge
c)
one side has a negative charge adn the other side has a neutral charge
d)
both sides are positive
11.
Attractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
12.
Which end of the water molecule has a slightly positive charge?
a)
the oxygen end
b)
the hydrogen end
c)
both ends are slightly positive
d)
neither end is positive
13.
Water, with nothing dissolved in it, will freeze at what temperature? 
a)
0° C
b)
32° C
c)
100 ° C
d)
115 ° C
14.
Polarity in the water molecule results from
a)
equal sharing of electrons.
b)
unequal sharing of electrons.
c)
ion formation.
d)
hydrogen bonding.
15.
These substances _______ interact with water because they are ________.
a)
would, polar/ionic
b)
would not, polar/ionic
c)
would, non-polar
d)
would not, non-polar
16.

Describe ADHESION.

a)

Water molecules attracted to other substances.

b)

Water molecules climbing upwards against the force of gravity.

c)

Water molecules dissolving many substances because of its polarity.

d)

Water molecules attracted to other water molecules.

17.

Which phase of water is most dense

a)

supercritical fluid

b)

solid

c)

liquid

d)

gas

e)

all phases have equal densities

18.

Which of the following is not an important characteristic of water in biology?

a)

Polarity

b)

High density as a liquid, low density as a solid

c)

low boiling point

d)

High specific heat capacity

e)

cohesion

19.

Which of the following properties of water are beneficial to life?

I. High specific heat

II. Low latent heat of vapourization

III. Ice floats in lakes

IV. Dissolves many polar molecules

a)

I, II and III

b)

II, III and IV

c)

I, II and IV

d)

I, III and IV

e)

III only

20.

Which of the following would the strongest type of bond present in a sample of water?

a)

Hydrogen bond

b)

Van der Waals interactions

c)

Ionic bond

d)

Covalent bond

e)

Dipole-dipole interactions

21.

Outline the structure of a molecule of water and explain how this structure allows water to be an excellent solvent. (5 marks)

4 lines
22.

Outline TWO major roles of water in cell function.(4 marks)

4 lines
23.

Explain the properties of water than specifically relate to its ability to move upwards from roots to stem and leaves. (4 marks)

4 lines
24.

When happens when water is mixed with a lipid and why ? (4 marks)

4 lines

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