CDB Benchmark Review (Chemistry and Energy)

A compound is __________________.

• A substance made from oxygen.

• A substance composed of two or more different elements.

• A substance that sinks in water.

• A substance composed of the same elements.

An atom is the smallest particle of an element that cannot be broken down without losing its properties.

• True

• False

A pure substance that cannot be broken down chemically into simpler substances.

• atomosphere

• compound

• element

• subscript

Which are examples of compounds? (multiple answers)

• 
• 
• 
• 

Abundant means not enough in quantity, or small amount.

• True

• False

Compose or comprise means to consist of, made up of or to contain

• True

• False

A chemical change is

• the formation of elements with similar properties

• the formation of a new substance with different properties

• the breakdown or decay of chemicals

• a way to show chemical substances using chemical symbols

A characteristic or trait that can be observed (color, mass, volume, odor, hardness, temperature)

• element

• density

• reaction

• property

All of the following are examples of chemical changes EXCEPT __________.

• A campfire burning

• A metal hammer that has rusted

• A pie being sliced

• A penny that has tarnished

Check all that apply. Which of the following are evidence that a chemical reaction occurred?

• color change

• change in shape

• formation of a precipitate

• formation of a gas

• a change in odor