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Water (7-O)

Total questions: 60

Worksheet time: 50mins

Name
Class
Date
1.

Atoms make up________.

a)

electrons.

b)

all matter.

c)

cake batter.

d)

toms.

2.

Electrons have a _____________ charge.

a)

positive

b)

negative

c)

neutral

d)

even

3.

Elements are the simplest forms of matter.

a)

True

b)

False

4.

Water is made from two different elements, these are________.

a)

Magnesium and Oxygen.

b)

Hydrogen and Magnesium.

c)

Oxygen and Hydrogen.

d)

Gold and Silver.

5.

Unlike charges ____________ and like charges ______________.

a)

repel, attract.

b)

stay, leave.

c)

attract, repel.

d)

leave, stay.

6.

Water is labelled a 'polar molecule'. Why?

a)

There is ice at the north and south poles.

b)

Water molecules have positively and negatively charged ends.

c)

Water slides down objects.

7.

The property of water molecules being attracted to other water molecules is called (a)   .

8.

The property of water molecules being attracted to other substances/materials (glass, soil) is called (a)   .

9.

_________ refers to the process by which highly concentrated molecules intermingle in another substance as a result of their kinetic energy of random motion.

a)

Division

b)

Diffusion

c)

Dilema

d)

Decision

10.

When grains of sugar are added to water the sugar molecules become surrounded by the attracted water molecules so that the individual sugar molecules are no longer part of the sugar crystals. This process continues until either all the sugar (________) has dissolved in the water (_________) to form a solution, or there are no longer any unattached water molecules remaining and so no more sugar can dissolve.

a)

solvent, solute

b)

solid, liquid

c)

liquid, solid

d)

solute, solvent

11.

When no more solute can dissolve in a solution, the solution is saturated.

a)

True

b)

False

12.

Flocculation is the process where alum and other chemicals are added to the water to gather dirt particles together

into clumps.

a)

True

b)

False

13.

Sedimentation is process of allowing the particles to float to the top leaving clear water below.

a)

True

b)

False

14.

The acceptable pH level for drinking water is between _________.

a)

1.5 - 3.5

b)

4.0 - 6.0

c)

6.5 - 8.5

d)

9.0 - 11.0

15.

Filtration is the process of water passing through filters or layers of sand, gravel and charcoal to remove smaller dirt particles.

a)

True

b)

False

16.

Waterways that receive sewage overflows, manures or fertilisers may lead to increased nitrate levels.

a)

sewage overflows

b)

manures

c)

fertilisers

d)

fresh water

17.

Increase nitrate levels could lead to an (a)   caused by cyanobacteria and in turn makes the water not safe for drinking.

18.

(a)   acts as a fine sieve, letting through small particles and stopping the larger ones.

19.

In membrane filtration, water is filtered through tiny holes in the wall of the membrane. What is another name for these holes?

a)

Spores

b)

Fillers

c)

Pores

d)

Filters

20.

How have you enjoyed science this term?

a)

I have really enjoyed science.

b)

I have enjoyed science.

c)

It's been good.

d)

I've somewhat enjoyed science.

e)

I haven't enjoyed science.

21.
Letter B is?
a)
evaporation
b)
transpiration
c)
condensation
d)
accumulation
22.
Letter C is?
a)
precipitation
b)
transpiration
c)
condensation
d)
accumulation
23.
Letter D is?
a)
precipitation
b)
transpiration
c)
condensation
d)
run off
24.
Letter F is?
a)
precipitation
b)
accumulation
c)
condensation
d)
run off
25.
What is the chemical formula for water?
a)
2HO
b)
H2O
c)
HO2
d)
H2O2
26.
How many hydrogen atoms are in one molecule of water?
a)
1
b)
2
c)
3
d)
4
27.

Potable water means...

a)

Water which comes straight from a river or reservoir

b)

Water containing bacteria

c)

Water which is safe to drink

d)

Water which contains a high concentration of salt

28.

Water pollution and waste plays a big factor in water shortage.

a)

True

b)

False

29.
What percent of Earth is covered by water and ice?
a)
85%
b)
90%
c)
75%
d)
97%
30.
The water cycle has...
a)
a beginning and an end. 
b)
no beginning and no end. 
c)
only a beginning. 
d)
only an end. 
31.
What is condensation?
a)
the change of water from a gas to a liquid. 
b)
the change of water from a liquid to a gas. 
c)
the change of water from a solid to a gas. 
d)
the change of water from gas to a solid. 
32.
What are the three states of water found on Earth?
a)
solid, liquid & gas
b)
oceans, lakes & streams
c)
evaporation, transpiration
d)
rain, sleet & hail
33.
When water _________, dew and clouds can form.
a)
Melts
b)
Evaporates
c)
Condenses
d)
Precipitates
34.
Evaporation occurs when water changes into ________.
a)
transpiration
b)
snow
c)
solid
d)
vapor
35.
What percent of Earth's water is the oceans?
a)
70%
b)
85%
c)
90%
d)
97%
36.
Which of these is a method for conserving fresh water?
a)
Taking long showers and baths
b)
Taking short showers and baths
c)
Leaving the water running while brushing your teeth
d)
Washing your car with a running hose
37.

What is surface area?

a)

the amount of something that touches the air

b)

the top of something hard

c)

length x width

d)

i have no idea

38.

What is evaporation?

a)

clouds

b)

when water vapor freezes

c)

when water turns into water vapor

d)

a rap song

39.

Something that is more dense than water

a)

recycles

b)

floats

c)

freezes

d)

sinks

40.

Something that is less dense than water

a)

recycles

b)

floats

c)

sinks

d)

freezes

41.

Hot water is _________ than cold water

a)

more dense

b)

less dense

c)

the same density

d)

cold

42.

Which step of the water cycle is when water turns into a gas?

a)

evaporation

b)

condensation

c)

precipitation

d)

collection

43.

Which step of the water cycle would have rain or snow?

a)

evaporation

b)

condensation

c)

precipitation

d)

collection

44.

Which step of the water cycle makes clouds?

a)

evaporation

b)

condensation

c)

precipitation

d)

collection

45.

Where does water come from?

a)

clouds

b)

trees

c)

glaciers

d)

It has always been here since earth was formed.

46.

What happens to water when it freezes?

a)

It breaks

b)

It expands

c)

It melts

d)

It evaporates

47.

What two things help water evaporate more quickly?

a)

warm temperatures

b)

cold temperatures

c)

big surface area

d)

small surface area

48.
Why can water have no net charge but have slight charges in different parts of the molecule?
a)
The oxygen end is slightly negative and the hydrogen end is slightly positive
b)
The hydrogen end is slightly negative and the oxygen end is slightly positive
c)
The hydrogen and oxygen ends change in polarity
d)
Because it is hydrophobic
49.
molecule in which opposite ends have opposite electric charges
a)
cohesion
b)
polar molecule
c)
hydrogen bond
d)
solution
50.
A molecule with electrically charged areas is called a _______________.
a)
magnet
b)
polar molecule
c)
solution
d)
electrical molecule
51.
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
52.
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
53.
Is Water Polar?
a)
Yes
b)
No
54.
A possible explanation to a problem that has not yet been tested. 
a)
data
b)
theory
c)
hypothesis
d)
fact
55.
This variable in an experiment is the one being deliberately changed by the scientist. 
a)
dependent variable
b)
independent variable
c)
data
d)
control group
56.
In a controlled experiment, how many independent variables can be worked with at a time? 
a)
one
b)
none
c)
two or more
d)
how ever many makes sense.
57.
Mr. S. sets up an experiment to see how the mass of a ball affects the distance it rolls off a ramp.  Identify the independent variable.
a)
distance traveled by the ball
b)
height of the ramp
c)
mass of the ball
d)
weight of the ball
58.
The positive particles of an atom are 
a)
electrons 
b)
positrons 
c)
neutrons 
d)
protons 
59.
the central region of an atom where its neutrons and protons are is its 
a)
nucleus 
b)
electron cloud
c)
core 
d)
center 
60.
an atom with atomic number 6 would have how many protons 
a)
6
b)
12
c)
3
d)
cannot be determined 

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