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Cumulative Exam — Cumulative exam Answers

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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.
2
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Which type of reaction is C12H22O11 → 12C + 11H2O?

A
synthesis
B
decomposition
C
oxidation
D
combustion
3

Sonya reads the element riddle below.I am shiny. I form +1 ions. There’s more!I am the most reactive metal in Period 4. Who am I?Which element is the answer to the riddle?

A
krypton
B
potassium
C
sodium
D
bromine
4

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
5

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
6

When ammonium chloride and water interact, less energy is released from breaking the bonds in the water and ammonium chloride than what is required to form the bonds of the new substance.

A
An endothermic reaction is occurring.
B
An exothermic reaction is occurring.
C
Energy is being released into the surroundings.
D
Energy escapes as light into the surroundings.
7

This chart shows what happens when each object is placed on a balance with a 10 kg weight on the other side.Which statement is best supported by the information in the chart?

Question illustration
A
Object 1 is the heaviest object.
B
Object 3 is heavier than Object 1.
C
The weight is heavier than Object 2.
D
The weight is the heaviest object.
8

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
9

At the center, 6 unmarked red balls are interspersed with 4 blue balls marked with plus signs. A green cloud with 2 concentric white lines surrounds the center, with 2 small green balls marked with minus signs on the inner white line and 2 small green balls marked with minus signs on the outer white line.

Question illustration
A
4
B
6
C
10
D
14
10

The graph indicates Linda’s walk.

Question illustration
A
Linda started out moving, and then stopped moving after 6 seconds.
B
Linda started moving away from the start point, and then moved closer.
C
Linda never moved the entire trip.
D
Linda’s path results in a negative slope.
11

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
12

Two football players are running toward each other. One football player has a mass of 105 kg and is running at 8.6 m/s. The other player has a mass of 90 kg and is running at -9.0 m/s.

A
93 kg · m/s
B
1,713 kg · m/s.
C
810 kg · m/s.
D
903 kg · m/s.
13

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
14

A log has a density of .8 g/cm³. What will happen to this log in freshwater, which has a density of 1.0 g/cm³?

A
It will sink.
B
It will float.
C
It will move deeper.
D
It will decrease in density.
15

Which properties do metalloids share with metals?

A
Both are shiny and are brittle.
B
Both are very conductive and are dull.
C
Both are brittle and are gases at room temperature.
D
Both are shiny and are solid at room temperature.
16

Which statement correctly describes compounds?

A
Compounds cannot be broken down into simpler substances by chemical means.
B
Each compound is composed of one type of molecule.
C
Compounds can be broken down into simpler substances by physical means.
D
Each compound is composed of one type of atom.
17

An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the acceleration?

A
negative acceleration of 4 m/s2
B
positive acceleration of 4 m/s2
C
positive acceleration of 9 m/s2
D
negative acceleration of 9 m/s2
18

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.
19

Which will decrease the rate of a reaction?

A
changing the temperature from 90ºC to 40ºC
B
adjusting the concentration from 30 ng to 60 ng
C
placing the substance in a smaller container
D
grinding the substance into a powder
20

The diagram shows a toy car on a number line.

Question illustration
A
–4
B
1
C
2
D
4

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