7.PS1.4 - Chemical Reactions

Front

What is a chemical reaction?

Back

A process in which substances (reactants) undergo a transformation to form new substances (products).

Front

What are reactants in a chemical equation?

Back

The starting substances that undergo a chemical change, found on the left side of the equation.

Front

What are products in a chemical equation?

Back

The substances formed as a result of a chemical reaction, found on the right side of the equation.

Front

How do you determine the number of reactants in a chemical equation?

Back

Count the distinct substances on the left side of the equation.

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in the molecule.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is the role of coefficients in a chemical equation?

Back

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

Front

What is the difference between a balanced and unbalanced chemical equation?

Back

A balanced equation has equal numbers of each type of atom on both sides, while an unbalanced equation does not.

Front

What is an example of a simple chemical reaction?

Back

The reaction of hydrogen and oxygen to form water: 2H₂ + O₂ → 2H₂O.

Front

What is a decomposition reaction?

Back

A type of chemical reaction where one compound breaks down into two or more simpler products.