AnswersEA Academy Civics 9Our Role in the Electoral Process

Our Role in the Electoral Process — Unit test Answers

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41
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When ammonium chloride and water interact, less energy is released from breaking the bonds in the water and ammonium chloride than what is required to form the bonds of the new substance.

A
An endothermic reaction is occurring.
B
An exothermic reaction is occurring.
C
Energy is being released into the surroundings.
D
Energy escapes as light into the surroundings.
42
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Why are scientists most likely working on developing cleaner-burning fuel for cars?

A
to increase fuel consumption
B
to increase fuel production
C
to reduce noise pollution
D
to reduce air pollution
43

Assuming the bull’s eye is the accepted value, which diagram shows results that are accurate and precise?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
44

Which type of reaction is C12H22O11 → 12C + 11H2O?

A
synthesis
B
decomposition
C
oxidation
D
combustion
45

Which is the most likely reason why scientists change a model?

A
The public wants to understand a concept more easily.
B
Students need illustrated models in a study guide.
C
New discoveries makes the current model inaccurate.
D
Current models may be uninteresting.
46

Covalent bonds tend to make atoms more stable by helping them

A
fill up their innermost electron shell.
B
fill up their outermost electron shell.
C
empty out their innermost electron shell.
D
empty out their outermost electron shell.
47

Zac releases the air from a balloon. Which statement best describes what will happen to the air that was inside the balloon?

A
It will become more compacted.
B
It will remain the shape of the balloon but not the size.
C
It will remain the size of the balloon but not the shape.
D
It will expand to fill the room.
48

Lava is rock that has undergone a physical change and has liquefied. What is known about this change?

A
The lava gained mass.
B
The lava was burned into smoke.
C
The lava can cool back into rock.
D
The lava lost mass.
49

Which statement correctly describes compounds?

A
Compounds cannot be broken down into simpler substances by chemical means.
B
Each compound is composed of one type of molecule.
C
Compounds can be broken down into simpler substances by physical means.
D
Each compound is composed of one type of atom.
50

There are several ways to model a compound. One type of model is shown.

Question illustration
A
CHO
B
C4H9O2
C
C4H8O
D
C3H8O2

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