Chem Unit 1 Study Guide

Which is the property of matter in which a substance can transfer heat or electricity?

• magnetism

• conductivity

• density

• solubility

Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?

• solubility

• conductivity

• magnetism

• density

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.

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.

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

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

The Statue of Liberty is made of copper that has turned green because it has undergone a change. What can be said about this change?

• The change is a physical change because the copper in the statue is still there.

• The change is a physical change because a new chemical is formed on the outside of the statue.

• The change is not a physical change because the color of the statue has changed.

• The change is not a physical change because a new chemical is formed on the outside of the statue.

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.

A scientist is examining an unknown solid. Which procedure would most likely help determine a chemical property of the substance?

• heating it to find the temperature at which it melts

• exposing it to a flame to see if it catches on fire

• hitting it with a hammer to determine if it breaks or bends

• placing it in water to find out whether or not it dissolves

Which characteristic of a substance is considered a chemical property?

• its boiling point

• its reactivity

• its density

• its conductivity