Cumulative Exam Answers

Which is the balanced equation for S8 + O2 → SO2?

S8 + O16 → 8SO2

S8 + O2 → S8 + O2

S8 + O2 → S8O2

S8 + 8O2 → 8SO2

In an investigation, the atoms of a certain substance lose energy during a change of state. Before the change, the atoms are far apart and move constantly at high speeds and in all directions. After the change, the atoms are close together but are able to slide past one another.Use the diagram that shows changes of state between solid, liquid, and gas to answer the question.

Which element is a halogen?

chlorine (Cl)

oxygen (O)

carbon (C)

radon (Rn)

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?

The nonmetal has more mass.

The nonmetal takes up more space.

The metal has more mass.

The metal takes up more space.

Which sound would most likely have the lowest pitch?

a bird chirping

a vacuum-cleaner running

a lawn mower running

a dog barking

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?

the top of the ramp

the bottom of the ramp

the ending position of the car

the starting position of the car

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

CaF

CaF4

2CaF

CaF2

A solution is oversaturated with solute. Which could be done to decrease the oversaturation?

dilute the solution

add more solute

cool the solution

add a different solute

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

Both Newlands and Mendeleev arranged elements according to their chemical properties, but only Newlands used atomic mass as well.

Both Newlands and Mendeleev arranged elements according to their atomic masses, but only Mendeleev used chemical properties as well.

Both Newlands and Mendeleev organized elements into groups, but only Newlands used a table with rows and columns.

Both Newlands and Mendeleev organized elements into a table with rows and columns, but only Mendeleev named different groups of elements.

A magnet placed against the wall of a metal shed falls to the ground, where it attracts a nail. What is the most likely explanation for this observation?

The wall is the opposite pole from the magnet.

The shed is not made of iron or steel.

The magnet is not magnetized.

The nail pulled the magnet to the ground.

Sodium hydroxide (NaOH) was added to pure water (H2O). Which most likely were the pH values of the water before and after the sodium hydroxide was added to it?

before = 7, after = 9

before = 7, after = 4

before = 4, after = 7

before = 9, after = 7

Hsaio manages the finances for her company and has a particularly large amount of money budgeted for the purchase of calcium chloride, or CaCl2. Which type of company does Hsaio most likely own?

a snow-plowing service

a cosmetics factory

a pottery art studio

a catering business

The diagram shows a toy car on a number line.

–4

A circuit contains two light bulbs connected in parallel. What would happen to the brightness of each light bulb if two more light bulbs were added in parallel to the first ones?

The brightness of each bulb would decrease because the total resistance of the circuit would decrease.

The brightness of each bulb would increase because the total resistance of the circuit would increase.

The brightness of each bulb would remain the same even though the total resistance of the circuit would decrease.

The brightness of each bulb would remain the same even though the total resistance of the circuit would increase.

Luz, who is skydiving, is traveling at terminal velocity with her body parallel to the ground. She then changes her body position to feet first toward the ground. What happens to her motion?

She will continue to fall at the same terminal velocity because gravity has not changed.

She will slow down because the air resistance will increase and be greater than gravity.

She will speed up because air resistance will decrease and be less than gravity.

She will begin to fall in free fall because she will have no air resistance acting on her.

A flashlight uses the chemical energy stored in a battery. This chemical energy is eventually converted into which two forms of energy?

mechanical and nuclear

radiant and thermal

thermal and mechanical

nuclear and electrical

Brian creates the diagram below to organize his notes on nuclear fission and fusion.

produces neutrons

forms heavier atoms

joins two nuclei

forms lighter nuclei

Farah is doing an experiment that involves calculating the speed of a longitudinal wave. What will most likely happen if she increases the temperature in the room?

The amplitude of the wave will increase.

The amplitude of the wave will decrease.

The speed of the wave will increase.

The speed of the wave will decrease.

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

The change in momentum needed to stop the gymnast is increased.

The change in momentum needed to stop the gymnast is decreased.

The force exerted by the floor on the gymnast decreases.

The force exerted by the floor on the gymnast increases.

A wheelbarrow can be used to help lift a load, such as a pile of dirt, and then push the load across a distance.