Chemical Reactions Practice Flashcard

Front

What is the substance formed in a chemical reaction called?

Back

Product.

Front

Which of the following is NOT a sign of a chemical reaction?

Back

The material dissolves.

Front

When is a chemical equation considered balanced?

Back

When the same number of each kind of atom appears in the reactants and in the products.

Front

How is a chemical equation balanced?

Back

By changing or adding coefficients.

Front

According to the LAW of Conservation of Mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be in the product?

Back

Two.

Front

What are reactants in a chemical reaction?

Back

Substances that undergo change during a chemical reaction.

Front

What is a chemical equation?

Back

A representation of a chemical reaction using symbols and formulas.

Front

What does it mean to balance a chemical equation?

Back

To ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the role of coefficients in a chemical equation?

Back

They indicate the number of molecules or moles of a substance involved in the reaction.

Front

What is a sign that a chemical reaction has occurred?

Back

A gas is given off.