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Cumulative Exam — Cumulative exam Answers

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Based on its location on the periodic table, which metal is likely to be less reactive than both strontium and sodium?

A
magnesium (Mg)
B
barium (Ba)
C
cesium (Cs)
D
rubidium (Rb)
22
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Question illustration
A
The forces are balanced.
B
The box will move to the right.
C
The box will move to the left.
D
The forces are unbalanced.
23

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
24

Which is an example of negative acceleration?

A
a snowboarder who increases speed when traveling downhill
B
a biker who maintains a constant speed through a race
C
a skateboarder who reduces speed when moving up a hill
D
a runner who fluctuates speed by increasing and decreasing speed
25

Which most likely indicates a chemical change has occurred?

A
a solid substance becoming larger
B
a solid melting and becoming a liquid
C
a green liquid becoming a red liquid
D
a liquid freezing and becoming a solid
26

Which describes a value for density?

A
a value for volume, such as m3, divided by a value for mass, such as kg
B
a value for mass, such as kg, divided by a value for volume, such as m3
C
a value for distance, such as m, divided by a value for time, such as s
D
a value for time, such as s, divided by a value for distance, such as m
27

A sample of a solid nonmetal is compared to a sample of a solid metal. Both samples have the same volume. What is the most likely difference between the two samples?

A
The nonmetal has more mass.
B
The nonmetal takes up more space.
C
The metal has more mass.
D
The metal takes up more space.
28

There are several ways to model a compound. One type of model is shown.

Question illustration
A
CHO
B
C4H9O2
C
C4H8O
D
C3H8O2
29

Which is an example of a chemical change?

A
frying an egg
B
boiling water
C
melting butter
D
chopping onions
30

This is how platinum appears in the periodic table.

Question illustration
A
78
B
117
C
195
D
273
31

Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized elements?

A
Both Newlands and Mendeleev arranged elements according to their chemical properties, but only Newlands used atomic mass as well.
B
Both Newlands and Mendeleev arranged elements according to their atomic masses, but only Mendeleev used chemical properties as well.
C
Both Newlands and Mendeleev organized elements into groups, but only Newlands used a table with rows and columns.
D
Both Newlands and Mendeleev organized elements into a table with rows and columns, but only Mendeleev named different groups of elements.
32

The symbol P represents the element phosphorus. This element’s atomic number is 15. How many protons and electrons are in a P–3 ion?

A
15 protons and 3 electrons
B
12 protons and 15 electrons
C
15 protons and 18 electrons
D
18 protons and 15 electrons
33

Lava is rock that has undergone a physical change and has liquefied. What is known about this change?

A
The lava gained mass.
B
The lava was burned into smoke.
C
The lava can cool back into rock.
D
The lava lost mass.
34

Juliana was late to physical science class and missed the beginning of the notes, including the title. These are the notes she took.-Makes up everything -Can be solid, liquid, or gas -Is made up of atoms, or tiny particles that are the smallest unit of matterWhat would be the best title for her notes?

A
Atoms
B
Matter
C
Mass
D
Weight
35

Which best describes a semiconductor?

A
Semiconductors are more conductive than a nonmetal and less conductive than a metal.
B
Semiconductors are more conductive than a nonmetal and less conductive than a metalloid.
C
Semiconductors have a high electrical conductivity.
D
Semiconductors have a no electrical conductivity.
36

A researcher is using a particle accelerator in an experiment studying isotopes. How can the researcher change one isotope into a different isotope of the same element?

A
by removing valence electrons
B
by adding valence electrons
C
by adding or removing protons
D
by adding or removing neutrons
37

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.
38

Alai is comparing the physical property of two materials. He is hitting each with a hammer to observe what happens. What physical property of the materials is Alai most likely observing?

A
solubility
B
conductivity
C
hardness
D
odor
39

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

Question illustration
A
CaF
B
CaF4
C
2CaF
D
CaF2
40

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.

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