Chemistry Test Review

Front

What is a chemical reaction?

Back

A process where molecules of old substances are broken apart and their atoms are rearranged to form new molecules, resulting in new substances.

Front

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

Back

H2 is an element.

Front

What are atoms?

Back

Atoms are really small particles that can join to make up molecules.

Front

What is a mixture?

Back

A blend of 2 or more substances.

Front

What can be inferred about seawater compared to plain water?

Back

Seawater is denser than plain water.

Front

What is the definition of a substance in chemistry?

Back

A form of matter that has a definite composition and distinct properties.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is solubility?

Back

Solubility is the ability of a substance to dissolve in a solvent.