AnswersEA Academy Civics 9Our Role in the Electoral Process

Our Role in the Electoral Process — Unit test Answers

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Carlos is making phosphorus trichloride using the equation below. 2P +3Cl2 _PCl3What coefficient of PCl3 would show that the law of the conservation of mass is represented in the chemical equation?

Question illustration
A
4
B
3
C
2
D
1
22
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Which describes a value for density?

A
a value for volume, such as m3, divided by a value for mass, such as kg
B
a value for mass, such as kg, divided by a value for volume, such as m3
C
a value for distance, such as m, divided by a value for time, such as s
D
a value for time, such as s, divided by a value for distance, such as m
23

Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized elements?

A
Both Newlands and Mendeleev arranged elements according to their chemical properties, but only Newlands used atomic mass as well.
B
Both Newlands and Mendeleev arranged elements according to their atomic masses, but only Mendeleev used chemical properties as well.
C
Both Newlands and Mendeleev organized elements into groups, but only Newlands used a table with rows and columns.
D
Both Newlands and Mendeleev organized elements into a table with rows and columns, but only Mendeleev named different groups of elements.
24

Which statement correctly describes the electrons in a water molecule?

A
Electrons are pulled closer to the hydrogen atoms.
B
Electrons are pulled closer to the oxygen atom.
C
Electrons are located inside the nucleus of the hydrogen atoms.
D
Electrons are located inside the nucleus of the oxygen atoms.
25

What did Thomson’s model of the atom include that Dalton’s model did not have?

A
a nucleus
B
energy levels
C
electron clouds
D
smaller particles
26

Based on its location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?

A
magnesium (Mg)
B
barium (Ba)
C
cesium (Cs)
D
rubidium (Rb)
27

Lucy is supposed to write down the lengths of 10 earthworms found near the playground at her school. She measures the earthworms’ lengths in millimeters, but she accidentally labels her data in centimeters.Which best describes this error in data collection?

A
The data are inadequate.
B
The data are false.
C
The data are recorded incorrectly.
D
The data cannot be reproduced.
28

Which statement best explains how the mass of an atom is organized?

A
Most of the mass is contained in the nucleus.
B
The mass is spread evenly throughout the whole atom.
C
The mass is spread evenly throughout the electron cloud.
D
Most of the mass is contained in the electron cloud.
29

Read the passage.In Federal Drug Administration clinical trials, people who added a particular drug to diet and exercise were able to lose weight, as well as lower their blood pressure. This drug was evaluated in two clinical studies involving overweight adults with high blood pressure. The results of the trials showed that 48 percent of people taking this drug lost some of their body weight. The other group in this trial consisted of people who were not taking this medicine, and only 23 percent of them lost some weight.

A
Exercise and diet help people lose more weight than with the aid of this drug.
B
This drug helps people lose more weight than diet and exercise alone.
C
Overweight adults have always had high blood pressure.
D
This drug won’t help people lower their blood pressure if they already exercise.
30

Look at the graph below.

Question illustration
A
calcium and iron
B
calcium and sodium
C
potassium and magnesium
D
potassium and sodium
31

A sample of a solid nonmetal is compared to a sample of a solid metal. Both samples have the same volume. What is the most likely difference between the two samples?

A
The nonmetal has more mass.
B
The nonmetal takes up more space.
C
The metal has more mass.
D
The metal takes up more space.
32

What is produced when calcium reacts with fluorine in a synthesis reaction?Ca + F2 ________

Question illustration
A
CaF
B
CaF4
C
2CaF
D
CaF2
33

This is how platinum appears in the periodic table.

Question illustration
A
78
B
117
C
195
D
273
34

Alai is comparing the physical property of two materials. He is hitting each with a hammer to observe what happens. What physical property of the materials is Alai most likely observing?

A
solubility
B
conductivity
C
hardness
D
odor
35

A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer at its bottom.

Question illustration
A
condensation
B
boiling
C
sublimation
D
freezing
36

How does Bohr’s model of the atom compare with Thomson’s model?

A
They both describe atoms as small, indivisible spheres.
B
They both describe electrons as moving around the nucleus.
C
They both describe electrons as being surrounded by the positive matter.
D
They both describe atoms as being made up of positive and negative matter.
37

Which most likely indicates a chemical change has occurred?

A
a solid substance becoming larger
B
a solid melting and becoming a liquid
C
a green liquid becoming a red liquid
D
a liquid freezing and becoming a solid
38

After reading a book about parrots, Tani wants to learn more about them. Which question could be answered through scientific investigation?

A
Which bird’s eggs taste the best?
B
What substances make up an eggshell?
C
Which birds have the most beautiful feathers?
D
Which type of bird makes the best pet in an apartment?
39

When a hammer strikes a compound formed by covalent bonds, what will most likely happen to the compound?

A
It will break into many pieces.
B
It will reform into a new shape.
C
It will spread out and then return to its original shape.
D
It will stay solid and resist the force of the hammer.
40

Which has most likely been peer reviewed?

A
an article on the benefits of eating cheese, featured in Crosscreek Dairy Monthly magazine
B
an article on the benefits of wearing shoe inserts, featured in Bob’s Footwear circular
C
an article on the beneficial bacteria in yogurt, featured in Medical Journal of Gastroenterology
D
an article on beneficial face creams, featured in Beauty and You magazine

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