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Chapter 3 Review
Test Description: 7th grade Chem
Instructions: Answer all questions to get your test result.
1) a liquid mixture in which particles can be seen and easily seperated by settling or filteration is a
A
solution
B
solvent
C
solute
D
suspension
2) how is a solute different from a solvent in a solution?
A
The solute is a solid and the solvent is a liquid.
B
The solute is a liquid and the solvent is a gas.
C
The solute is present in a smaller amount.
D
The solute is present in a greater amount.
3) How can a scientist tell whether a solution is salt in water or sugar in water?
A
by filtering the solution
B
by tasting the solution
C
by testing the electrial conductivity of the solution
D
by smelling the solution
4) Weak tea is an example of a
A
suspension
B
concentrated solution
C
solvent
D
dilute solution
5) What is one way to increase the solubility of sugar in water?
A
decrease the amount of sugar
B
increase the amount of sugar
C
chill the water
D
heat the water
6) What happens when you add salt to the water when cooking spaghetti?
A
It makes the spaghetti cook more slowly.
B
It brings the water to a boil faster
C
It makes the water boil at a higher temperature.
D
It reduces evaporation of the water.
7) Which is a characteristic property of acids?
A
turn red litmus paper blue
B
do not react with metals
C
tastes bitter
D
turn blue litmus paper red
8) Any substance that forms hydrogen ions (H+) in water is a(n)
A
acid
B
base
C
indicator
D
salt
9) The pH scale measures
A
the strength of hydrogen ions
B
the concentration of hydrogen ions
C
the strength of an acid
D
the concentration of an acid
10) How is pH important during digestion?
A
Different foods have different pH values.
B
Different enzymes work best at different pH values.
C
Enzymes react best with acids.
D
Digestion needs a constant pH to take place.
11) Normal rainfall is slightly acidic, which means its pH must be
A
between 5 and 7
B
between 2 and 4
C
between 7 and 9
D
less than 2
12) A measure of how well a solute can dissolve in a solvent at a given temperature is that
A
acidity
B
concentration
C
saturation point
D
solubility
13) What do enzymes in the digestive system do?
A
neutralize stomach acid
B
make the stomach acidic
C
speed up mechanical digestion
D
speed up chemical digestion
14) Acids naturally present in food are safe to eat because they usually are
A
dilute
B
concentrated
C
strong
D
weak
15) You can find the pH of a substance by using
A
a conductivity tester
B
plain paper
C
a thermometer
D
an indicator
*select an answer for all questions
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