Unit 2: Chemical Formulas and Equations Vocabulary

Front

What is a chemical reaction?

Back

A process where substances interact to form one or more new substances with different properties than the original substances.

Front

What is a compound?

Back

A chemical substance made up of 2 or more different types of atoms bonded together.

Front

What are products in a chemical reaction?

Back

Formulas written on the right side of the arrow symbol that represent the new substances formed in a chemical reaction.

Front

What are reactants in a chemical reaction?

Back

Formulas written on the left side of the arrow symbol that represent the starting substances in a chemical reaction.

Front

What does H2O represent?

Back

It represents a compound, specifically water, made up of two hydrogen atoms and one oxygen atom.

Front

What is a chemical formula?

Back

A way of expressing information about the atoms that constitute a particular chemical compound.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules or atoms of that substance are involved in the reaction.

Front

What is a subscript in a chemical formula?

Back

A number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

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, matter is neither created nor destroyed; the mass of the reactants equals the mass of the products.