AnswersMO-Physical Science A-CRLab: Motion

Lab: Motion — Cumulative exam Answers

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What is produced during the replacement reaction of Cu(NO3)2 and Zn?

A
ZnNO3 + Cu
B
Zn + Cu(NO3)2
C
ZnCu + 2NO3
D
Zn(NO3)2 + Cu
2
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In the hypothetical reaction below, substance A is consumed at a rate of 2.0 mol/L·s. If this reaction is at dynamic equilibrium, at what rate will substance B be consumed?A B

Question illustration
A
0.0 mol/L·s
B
1.0 mol/L·s
C
2.0 mol/L·s
D
4.0 mol/L·s
3

Consider the reaction below.H2(g) + CO2(g) H2O(g) + CO(g)At equilibrium at 600 K, the following are true. [CO2] = 9.5 x 10-4 M[H2] = 4.5 x 10-2 M[H2O] = 4.6 x 10-3 M[CO] = 4.6 x 10-3 MWhat is the value of the equilibrium constant for this reaction in correct scientific notation?

Question illustration
A
4.9 x 10-3
B
4.9 x 10-2
C
4.9 x 10-1
D
4.9 x 103
4

An amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change?

A
The boiling point of the nitrogen increased.
B
The mass of nitrogen increased.
C
The color changed.
D
The density changed.
5

A football player has a mass of 65 kg and is moving with a velocity of 5 m/s. What is the player’s momentum?

A
13 kg • m/s
B
70 kg • m/s
C
305 kg • m/s
D
325 kg • m/s
6

The atoms in a sample are close together but can slide past one another. As the atoms lose energy, they move slower. The atoms become locked in place because of attractive forces between them.

A
gas to solid
B
gas to liquid
C
liquid to solid
D
solid to liquid
7

A tugboat is pulling a barge into a harbor. The barge is exerting a force of 3000 N against the tugboat.Which force would most likely allow the tugboat to move the barge into the harbor?

A
4500 N in the opposite direction of the barge
B
3000 N in the opposite direction of the barge
C
3000 N in the same direction of the barge
D
4500 N in the same direction of the barge
8

Sayid made a chart listing data of two colliding objects.According to the law of conservation of momentum, what is the missing value in the chart?

Question illustration
A
4
B
6
C
10
D
16
9

What happens to the total mass of a substance undergoing a physical change?

A
It stays the same.
B
It doubles.
C
It triples.
D
It is reduced.
10

Four students are analyzing four different substances and recording their findings in this table.Which most describes this table?

Question illustration
A
Leonna has a solid, Xiao and Blake have liquids, and Amir has a gas.
B
Leonna and Amir have gasses, Xiao has a liquid, and Blake has a solid.
C
Leonna has a solid, Xiao has a liquid, Blake has a gas, and Amir made a mistake.
D
Leonna has a solid, Xiao has a liquid, Blake made a mistake, and Amir has a gas.
11

The graph represents velocity vs. time for Carla.

Question illustration
A
Carla sped up in the beginning of her trip, stopped, and then slowed down.
B
Carla had a greater acceleration in the beginning than in the end.
C
Carla slowed down in the beginning of her trip, stopped, and then sped up.
D
Carla had a continuous acceleration throughout the entire trip.
12

Which property of physical changes explains why matter is conserved in a physical change?

A
The arrangements of particles do not change, and the bonds between atoms do not break.
B
Mass, not energy, changes in a physical change.
C
Energy and mass change in a physical change.
D
The bonds between atoms do not break; it is only the arrangement that changes.
13

Two objects collide and bounce apart. Assuming no outside forces act on the system, which best describes the total momentum after the collision?

A
It is always greater than it was before the collision.
B
It is often greater than it was before the collision.
C
It is always the same as it was before the collision.
D
It is often the same as it was before the collision.
14

Atoms of iron (Fe) form metallic bonds with other iron atoms. How are the valence electrons of these atoms rearranged to form the bonds?

A
A few valence electrons are shared between the atoms.
B
Many valence electrons are shared between the atoms.
C
Electrons are transferred from the iron atoms to atoms in the air.
D
Electrons are transferred to the iron atoms from atoms in the air.
15

Which type of reaction is Mg + S → MgS?

A
polymerization
B
synthesis
C
replacement
D
decomposition
16

Which refers to an object’s resistance to any change in its motion?

A
force
B
acceleration
C
gravity
D
inertia
17

Who was the first chemist to organize elements by atomic number?

A
Johann Wolfgang Döbereiner
B
Antoine Lavoisier
C
Henry Moseley
D
John Newlands
18

What kind of acceleration occurs when an object speeds up?

A
positive
B
negative
C
neutral
D
zero
19

If a chemical reaction does not reach its activation energy, which will most likely occur?

A
The chemical bonds will remain unchanged.
B
The chemical bonds will break.
C
The chemical bonds will have high kinetic energy.
D
The chemical bonds will already be broken.
20

What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________

Question illustration
A
MgCl2
B
Mg2Cl2
C
Mg2Cl
D
MgCl

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