Matter Unit Review

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H) and oxygen (O).

Front

Which of the following represents an element? H2O, H2, NaCl, CaCO3

Back

H2

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound or element in a chemical equation to indicate how many molecules or atoms are present.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that retain their individual properties. Examples include air and salad.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include distilled water and gold.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.

Front

Is the equation Fe + S --> FeS balanced or unbalanced?

Back

Balanced

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as flammability or reactivity.

Front

What is an example of a chemical property of paper?

Back

Flammable

Front

What is a physical property?

Back

A physical property is a characteristic of a substance that can be observed without changing its chemical composition, such as color, density, or melting point.