AnswersPhysical ScienceChemical Changes in the Natural World

Practice Test Answers

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1
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How does litmus paper identify a base?

A
A base turns orange litmus red.
B
A base turns yellow litmus blue.
C
A base turns blue litmus red.
D
A base turns red litmus blue.
2
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Which jar contains a mixture?

A
a jar of liquid copper
B
a jar of copper and water
C
a jar of solid carbon
D
a jar of carbon dioxide gas
3

Which explains why mixtures can be separated?

A
The components have the same properties.
B
The components are always made of small particles.
C
The components are always made of large particles.
D
The components have different properties.
4

Which describes how a centrifuge separates a mixture?

A
It heats a sample to separate based on density.
B
It spins a sample to separate based on boiling point.
C
It spins a sample to separate based on density.
D
It heats a sample to separate based on boiling point.
5

Which solution has the greatest number of hydrogen ions?

A
lemon juice, pH is equal to 2
B
soda, pH is equal to 3 point 5
C
bleach, pH is equal to 13 point 5
D
blood, pH is equal to 7 point 2
6

Recall that photosynthesis consists of two sets of chemical reactions. Which of these describes the energy conversions that occur during the light-independent reactions?

A
chemical energy right arrow chemical energy
B
chemical energy right arrow mechanical energy
C
mechanical energy right arrow mechanical energy
D
light energy right arrow chemical energy
7

Which best explains why a thick tropical forest filled with large plants typically has a lot of water vapor in the air?

A
The plants undergo transpiration.
B
The plants prevent water from evaporating.
C
The plants prevent water from becoming runoff.
D
The plants undergo condensation.
8

The chemical equation summarizes the process of photosynthesis. 6 CO sub 2 plus 6 cap h sub 2 cap o plus energy rightarrow 6 cap o sub 2 plus cap c sub 6 cap h sub 12 cap o sub 6 Where is the energy shown in the equation transferred as a result of photosynthesis?

A
into the ground
B
into water
C
into sugars
D
into the air
9

Which organisms release carbon dioxide as waste?

A
consumers only
B
consumers and decomposers
C
producers only
D
producers and decomposers
10

A student is trying to determine if a solution is acidic or basic. She does not have any litmus paper. Which would she most likely use to get a reading on her solution?

A
cabbage juice
B
soap
C
aquarium water
D
vinegar
11

Why is citric acid added to food?

A
to add color
B
to add sweetness
C
to add bitterness
D
to add tartness
12

Which separation procedure is most likely to happen?

A
Melting an element will break it down into compounds.
B
Boiling a pure substance will separate it into mixtures.
C
Filtering a mixture will separate it into substances.
D
Freezing a compound will break it down into elements.
13

Sublimation is the opposite of deposition just as evaporation is the opposite of

A
fusion
B
freezing
C
transpiration
D
condensation
14

By which process does water vapor become a cloud?

A
condensation
B
transpiration
C
evaporation
D
precipitation

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