Answers TX-Integrated Physics and Chemistry A-CRUnit Test

Chemical Properties Answers

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Wax melts when it is heated. Which most likely describes what is true of the result of this reaction?

The bonding of the atoms is not the same before and after the change.

The wax has the same density before and after the change.

The same amount of wax exists before and after the change.

The wax cannot be changed back into a solid.

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Liquid plastic is frozen in a physical change that increases its volume. What can be known about the plastic after the change?

Its mass will increase.

Its density will increase.

Its mass will remain the same.

Its density will remain the same.

Eugene describes the physical property of a material as “sweet and floral.” What physical property of the material is Eugene most likely observing?

boiling point

shape

hardness

odor

A soft, silvery-white metal combines with a yellow gas to form a white crystal-like solid. What can be said about this change?

The change is a physical change because the yellow gas changed into a solid.

The change is a physical change because a new substance was not formed.

The change is not a physical change because the color of the metal changed.

The change is not a physical change because a new substance was formed.

Which scenario is an example of a physical change?

Wood is burned in a campfire and is turned into ash and smoke.

A piece of metal is left in the rain and forms rust.

Lead is melted into a liquid to form pellets.

Yeast turns sugar into energy, water, and carbon dioxide gas.

What is an example of a physical change?

having less ash than the paper that was burned to form it

ice forming and then melting back into water

rust having a different identity than the iron it forms on

the irreversible reaction of vinegar and baking soda

When water (H2O) freezes into ice, some of the properties have changed. What stays the same?

identity of the H2O

energy of the H2O

arrangement of the H2O

property of the H2O

When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?

the conservation of magnetism

the change in solubility in a physical change

the change in melting point in a physical change

the rearrangement of particles in a physical change

Which can occur in a physical change?

The mass can increase.

The particles can arrange in different ways.

The mass can decrease.

The atoms can bond to different atoms.

What happens when a substance undergoes a physical change?

Some physical properties change, but the substance keeps its identity.

No physical properties change, and the substance keeps its identity.

Some physical properties change, and the substance changes its identity.

No physical properties change, but the substance changes its identity.

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Chemical Properties Answers

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