Conservation of Mass

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 reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction, appearing on the left side of a chemical equation.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction, appearing on the right side of a chemical equation.

Front

What are coefficients in a chemical equation?

Back

Coefficients are numbers placed in front of the compounds in a chemical equation to indicate the number of molecules or moles of each substance involved in the reaction.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products so that the number of atoms of each element is the same on both sides of the equation.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides, indicating that mass is conserved during the reaction.

Front

What is an example of a balanced chemical equation?

Back

An example of a balanced chemical equation is: 2H2 + O2 → 2H2O.

Front

What happens to atoms during a chemical reaction?

Back

Atoms are rearranged during a chemical reaction; they do not disappear or change into different atoms.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations is important because it reflects the conservation of mass and allows for accurate stoichiometric calculations.

Front

What is the difference between physical and chemical changes?

Back

Physical changes do not alter the chemical composition of a substance, while chemical changes result in the formation of new substances.