AnswersAA-F26 Physical ScienceBalancing Chemical Equations

Balancing Chemical Equations — Unit test Answers

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What else is produced during the replacement reaction of silver nitrate and potassium sulfate?2AgNO3 + K2SO4 Ag2SO4 + ________

Question illustration
A
KNO3
B
2KNO3
C
K2
D
2AgNO3
2
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A substance occupies one half of an open container. The atoms of the substance are closely packed but are still able to slide past each other.What is most likely the phase of the substance?

A
gas
B
liquid
C
solid and gas
D
liquid and solid
3

Lexi is balancing equations. She is finding one equation to be very difficult to balance. Which explains how to balance the equation ZnSO4 + Li2CO3 → ZnCO3 + Li2SO4?

A
One reactant and one product needs the coefficient 2.
B
The products both need a 3 coefficient.
C
The reactants both need a 2 coefficient.
D
Atoms in the equation are already in balance.
4

Which type of reaction has the general formula of AB + CD → AD + CB?

A
synthesis
B
decomposition
C
oxidation
D
replacement
5

Which condition must be met in order for an equation to be balanced?

A
The elements in the reactants are the same as the elements in the products.
B
There are fewer elements in the reactants than there are in the products.
C
The number of atoms in the reactants is greater than the number of atoms in the products.
D
The number of atoms in the reactants equals the number of atoms in the products.
6

Venn diagrams are used for comparing and contrasting different topics. The overlapping sections show characteristics that the topics have in common, and the sections that are unique to each topic show the characteristics apply to only that topic.

Question illustration
A
Overlapping circles are labeled definite shape most dense at top, mid-level density at right, definite volume least dense at left, with the intersection labeled state of matter.
Option A
B
Overlapping circles are labeled definite shape most dense at top, mid-level density at right, least dense at left, with the intersection of all three labeled state of matter. The intersection of the top and right circles is labeled definite volume.
Option B
C
Overlapping circles are labeled definite shape most dense at top, definite volume mid-level density at right, least dense at left, with the intersection of all three labeled state of matter. The intersection of the left and right circles is labeled definite shape.
Option C
D
Overlapping circles are labeled definite shape least dense at top, definite mid-level density at right, most dense at left, with the intersection of all three labeled state of matter. The intersection of the left and right circles is labeled definite shape.
Option D
7

Which is most likely a physical change?

A
cutting a substance into four pieces
B
burning a substance into ash and smoke
C
reacting a substance chemically to form a new substance
D
combining a substance with water to make rust
8

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?

A
If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.
B
If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.
C
If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.
D
If the substance is a liquid or solid, production of an odor would indicate a chemical change.
9

Which is the amount of matter in an object?

A
weight
B
mass
C
volume
D
pounds
10

During which change of state do atoms lose energy?

A
sublimation
B
freezing
C
boiling
D
melting
11

The density of solid aluminum is 2.70 g/cm3. If a 1g piece of aluminum is dropped in a cup of water, what will happen to the aluminum? (The density of water is 1.00 g/cm3.)

A
It will sink to the bottom.
B
It will float to the top.
C
It will hover in the middle.
D
It will move up and down.
12

Which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (HCl) solution?

A
cooling the HCl solution until it becomes solid, and measuring this temperature
B
adding zinc to the HCl solution and observing whether or not bubbles are produced
C
placing a conductivity probe into a beaker of HCl solution to determine if it conducts electricity
D
measuring the mass of and volume of a sample of HCl solution to find its density
13

Which is a characteristic of atoms?

A
They come in ten major types.
B
They are the smallest units of matter.
C
They can be found in nonliving things only.
D
They cannot combine together.
14

Rahul sees a flock of birds. He watches as the flying birds land in neat little rows on several power lines. Which change of state does the motion of the birds most closely model?

A
melting
B
vaporization
C
deposition
D
sublimation
15

Which balances the equation Mg + O2 → MgO?

A
Mg + 2O2 → 4MgO
B
2Mg + 2O2 → 2MgO
C
2Mg + O2 → 2MgO
D
2Mg + 2O2 → 4MgO
16

Which is the process by which a gas changes to a solid?

A
deposition
B
evaporation
C
freezing
D
sublimation
17

What are the products of the combustion of a hydrocarbon?

A
carbon and oxygen
B
carbon dioxide and water
C
carbon and hydrogen
D
carbon dioxide and hydrogen
18

Four students made statements about a tennis ball they were using in a lab.Which student made a mistake in her statement?

Question illustration
A
Irma
B
Julia
C
Grace
D
Masha
19

Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance.Which statement can be known about the behavior of the atoms in each container?

A
The atoms in the solid would be moving vigorously around the container.
B
The atoms in the liquid would be vibrating in position.
C
The atoms in the solid would be vibrating in position.
D
The atoms in the gas would be moving slowly around the container.
20

The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.

Question illustration
A
L
B
M
C
N
D
O

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