8th Grade Science EOG Review (NC 8.P.1)

Front

What does the Law of Conservation of Mass state?

Back

The mass of the atoms in the reactants equals the mass of the atoms in the products in a chemical reaction.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together, such as sugar.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means, such as iron.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances, such as cooking an egg.

Front

What are valence electrons?

Back

Electrons in the outermost shell of an atom that determine how the atom can bond with others.

Front

Which group of elements does chlorine most readily bond with?

Back

Group 1 elements, as they can easily donate an electron to chlorine.

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 new substances.

Front

What is the formula for carbonic acid?

Back

H2CO3.

Front

What happens to the mass of substances during a chemical reaction?

Back

The total mass remains constant; it is conserved.

Front

What is an example of a physical change?

Back

Melting butter.