AnswersEA Academy Online Learning and Digital Citizenship Elective SpringUnit Test

Unit Test — Cumulative exam Answers

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Suna passes an electric current through a sample of clear, colorless, and odorless liquid. As the experiment continues, bubbles form, and the volume of liquid decreases. Suna collects samples of two colorless, odorless gases that bubble out of the liquid. One of the gases burns. Neither the original liquid nor the other gas burns.Which is the best explanation of her results?

A
The electric current changed some of the sample to gas even though the sample was not breaking down. Therefore, the original liquid is a compound.
B
The electric current released a gas that was odorless and colorless, like the original sample. Therefore, the original liquid is an element.
C
The sample was broken down by the electric current and formed a new substance that could burn. Therefore, the original liquid is a compound.
D
The sample lost some of its volume, but the gas still had the same chemical makeup as the original sample. Therefore, the original liquid is an element.
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The best reason to stay positive before a test is to

A
prevent all forms of anxiety.
B
get the best test score.
C
keep self-esteem high.
D
allow ideas to flow freely.
123

Which is an example of a chemical reaction?

A
paper folded into tiny pieces
B
paper burned and turned into smoke
C
paper soaked in water
D
paper shredded and turned into pulp
124

Why did the American colonies want to form a national government after declaring independence from Great Britain?

A
They wanted to write a constitution.
B
They wanted to unite against Great Britain.
C
They were unhappy with their state constitutions.
D
They were about to lose the war against Great Britain.
125

An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?

A
The atom has 7 neutrons and 8 protons.
B
The atom has 7 electrons and 8 protons.
C
The atom has 8 neutrons and 7 electrons.
D
The atom has 8 electrons and 7 protons.
126

Before turning in a test, it would be best to

A
rush through the test and panic.
B
make sure that some answers are incomplete.
C
check how quickly the test was completed.
D
check the grammar and double check the work.
127

The balanced equation below shows the products that are formed when butane (C4H10) is combusted. 2C4H10 + 13O2 8CO2 + 10H2OWhat is the mole ratio of butane to carbon dioxide?

Question illustration
A
2:8
B
1:5
C
13:8
D
13:10
128

Which idea is the best definition of verbal communication?

A
communication that is always positive and helpful
B
communication that uses either spoken or written words
C
communication in which people argue passionately about something
D
communication that is done through gestures and facial expressions
129

Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced if 11.0 mol of Al are produced?

Question illustration
A
8.25 mol
B
11.0 mol
C
14.7 mol
D
16.5 mol
130

Metacognition is the awareness of one’s

A
grades and GPA.
B
learning and thinking.
C
homework and tests.
D
school and life balance.
131

Cherylanne mixes together Chemical A and Chemical B in a test tube, forming Chemical C. The mixture instantly turns cool to the touch. She then adds Chemical D, and the reaction becomes hot and explodes.

A
Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction.
B
Chemicals A and B form an exothermic reaction, and chemicals C and D form an endothermic reaction.
C
Chemicals A and C form an endothermic reaction, and chemicals B and D form an exothermic reaction.
D
Chemicals A and B form an exothermic reaction, and chemicals B and D form an endothermic reaction.
132

How can federal judges be removed from their positions?

A
by popular vote
B
by the Supreme Court
C
through recall by state governors
D
through impeachment by Congress
133

The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Which comparison is best supported by this information?

A
They are in the same group because they have similar atomic masses, but they are in different periods because they have different chemical properties.
B
They are in the same group because they have similar chemical properties, but they are in different periods because they have very different atomic numbers.
C
They are in the same group because their atomic numbers are each multiples of four, but they are in different periods because they have different chemical properties.
D
They are in the same group because they have similar atomic masses, but they are in different periods because they have very different atomic numbers.
134

The negative self-talker who would say, "No matter how hard I try, I will fail the test," is the

A
critic.
B
victim.
C
worrier.
D
perfectionist.
135

Which clue can be used to identify a chemical reaction as a combustion reaction?

A
Oxygen is a product.
B
A hydrocarbon reacts with oxygen.
C
Water and carbon dioxide react.
D
The reaction involves ions.
136

Molly is conducting research for her presentation about a recycling policy. How might local residents help her with this step?

A
by organizing a cleanup day in their community
B
by answering questions on ways to improve recycling
C
by promising to recycle and reuse plastic items more often
D
by passing legislation related to recycling in their community
137

Rutherford used positively charged particles to investigate the structure of the atom. The results surprised him, and he developed the atomic model shown below.

Question illustration
A
A few positive particles bounced back because they bounced off of the net formed by the ovals.
A
A few positive particles bounced back because they were pushed away from the positive center.
M
Most positive particles passed through because of the empty space between the outer edge and the center.
M
Most positive particles passed through because they were attracted by the small particles moving around the center.
138

clutterlightnoisemovement

A
clutter
B
light
C
noise
D
movement
139

What must occur in order for a chemical reaction to be specifically classified as endothermic instead of exothermic?

A
Atoms are rearranged.
B
Chemical bonds are formed.
C
Energy is released in the form of heat.
D
Energy is absorbed in the form of heat.
140

What is the definition of democracy?

A
a group of people who decide a court case
B
legal recognition as a resident of a country
C
a government ruled by its citizens
D
the system in which representatives govern

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