AnswersMO-Physical Science A-CRLab: Motion

Lab: Motion — Cumulative exam Answers

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1
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The diagram shows a toy car on a number line.

Question illustration
A
–4
B
1
C
2
D
4
2
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Cellular respiration is a biological process in which glucose is broken down to form energy in the form of ATP. The reactants have a starting energy of 3564 kilojoules of energy, and the products have a resulting 2878 kilojoules of energy.Which best describes cellular respiration?

A
It is an exothermic reaction because energy is lost.
B
It is an exothermic reaction because energy is gained.
C
It is an endothermic reaction because energy is lost.
D
It is an endothermic reaction because energy is gained.
3

Gymnasts often practice on foam floors, which increase the collision time when a gymnast falls. What effect does this have on collisions?

A
The change in momentum needed to stop the gymnast is increased.
B
The change in momentum needed to stop the gymnast is decreased.
C
The force exerted by the floor on the gymnast decreases.
D
The force exerted by the floor on the gymnast increases.
4

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.
5

Which statement best describes the equation CaCO3 + 2HCl → CaCl2 + CO2 + H2O?

A
CaCO3 is a reactant; it is present before the reaction occurs.
B
CaCl2 is a reactant; it is present before the reaction occurs.
C
CO2 is a reactant because it is most likely a gas.
D
H2O is a reactant because it is most likely a liquid.
6

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

A
synthesis
B
decomposition
C
oxidation
D
combustion
7

Consider the following reversible reaction.What is the equilibrium constant expression for the given system?

Question illustration
A
Option
Option A
B
K subscript e q equals StartFraction StartBracket upper C upper O subscript 2 EndBracket over StartBracket upper O subscript 2 EndBracket EndFraction.
Option B
C
K subscript e q equals StartFraction StartBracket upper C EndBracket StartBracket upper O subscript 2 EndBracket over StartBracket upper C upper O subscript 2 EndBracket EndFraction.
Option C
D
K subscript e q equals StartFraction StartBracket upper O subscript 2 EndBracket over StartBracket upper C upper O subscript 2 EndBracket EndFraction.
Option D
8

How long will a radioactive isotope decay?

A
until it reaches its half-life
B
until there is no more material
C
until it becomes a different, stable element
D
until the neutrons are returned to the base element level
9

This is how platinum appears in the periodic table.

Question illustration
A
78
B
117
C
195
D
273
10

An object is moving north at a constant speed. A force of 5 N begins to push the object east at the same moment that a force of 5 N begins to push it west. What will happen to the object?

A
The object will turn toward the west.
B
The object will slow down and stop.
C
The object will accelerate toward the east.
D
The object will continue moving north.
11

A substance is on its fifth half-life. Which approximates the percentages of radioactive and stable isotopes, respectively?

A
96.9%; 3.1%
B
3.1%; 96.9%
C
12.5%; 87.5%
D
87.5%; 12.5%
12

Which coefficient is needed in front of NaNO3 to balance the equation Na2S + Zn(NO3)2 → ZnS + _NaNO3?

A
1
B
2
C
5
D
7
13

Which is an example of a chemical change?

A
frying an egg
B
boiling water
C
melting butter
D
chopping onions
14

Kenneth ran a marathon (26.2 miles) in 5.5 hours. What was Kenneth’s average speed? (Round your answer to the nearest tenth.)

A
0.2 mph
B
4.8 mph
C
5.5 mph
D
144.1 mph
15

Sudhi is studying the motion of a toy car. She places the car in the middle of a ramp and releases it.Which best describes the reference point in this scenario?

A
the top of the ramp
B
the bottom of the ramp
C
the ending position of the car
D
the starting position of the car
16

Kiley, Jermaine, and Gunther are playing tug-of-war. Kiley and Jermaine are on the same side of the rope, and Gunther is on the other side. Kiley is exerting a force of 20 N, and Jermaine is exerting a force of 25 N.

A
45 N in the opposite direction as Kiley and Jermaine
B
20 N in the opposite direction as Kiley and Jermaine
C
20 N in the same direction as Kiley and Jermaine
D
45 N in the same direction as Kiley and Jermaine
17

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

Question illustration
A
CaF
B
CaF4
C
2CaF
D
CaF2
18

How would an electron shell model of an oxygen atom (O) appear after the atom has formed chemical bonds?

A
It would have six electrons in the outermost shell.
B
It would have six electrons in the innermost shell.
C
It would have eight electrons in the outermost shell.
D
It would have eight electrons in the innermost shell.
19

During a camping trip, Sierra collected dry branches and broke them into smaller pieces. She then placed the sticks in a fire pit and used a match to light the sticks on fire. Next, she propped a metal pan of water over the fire and heated it until the water boiled.

A
physical change: breaking stickschemical changes: lighting the fire, boiling water
B
physical change: boiling waterchemical change: breaking sticks, lighting the fire
C
physical changes: lighting the fire, boiling waterchemical change: breaking sticks
D
physical changes: breaking sticks, boiling waterchemical change: lighting the fire
20

This chart shows descriptions of the atoms for four different substances.

Question illustration
A
Object 1
B
Object 2
C
Object 3
D
Object 4

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