Learning Check - Chemical Reactions/Counting Atoms

Front

What is a subscript in a chemical formula?

Back

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

Front

How many atoms of sodium are present in the compound 6NaCl?

Back

There are 6 sodium atoms in the compound 6NaCl.

Front

What type of reaction is characterized by the release of heat and light, producing carbon dioxide and water?

Back

This type of reaction is called a combustion reaction.

Front

What is the generalized equation for a synthesis reaction?

Back

The generalized equation for a synthesis reaction is A + B → AB.

Front

What is the generalized equation for a single displacement reaction?

Back

The generalized equation for a single displacement reaction is A + BC → AC + B.

Front

What is the definition of a chemical reaction?

Back

A chemical reaction is a process in which one or more substances are converted into one or more different substances.

Front

What are the reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo a chemical change in a reaction.

Front

What are products in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, ensuring the law of conservation of mass is upheld.