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 does it mean to balance a chemical equation?

Back

To ensure that the number of atoms of each element is the same on both sides of the equation, reflecting the conservation of mass.

Front

What is the Law of Conservation of Mass?

Back

It states that matter cannot be created or destroyed in a chemical reaction.

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

How do you determine the coefficients needed to balance a chemical equation?

Back

By adjusting the coefficients to ensure that the number of atoms for each element is equal on both sides of the equation.

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g).

Front

What happens to atoms during a chemical reaction?

Back

Atoms get rearranged to form new substances.

Front

What is the balanced equation for the reaction of hydrogen and oxygen to form water?

Back

2H2 + O2 → 2H2O.

Front

What is the significance of the coefficients in the equation 2H2 + O2 → 2H2O?

Back

The coefficients indicate that two molecules of hydrogen react with one molecule of oxygen to produce two molecules of water.

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.