Law of 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 the reactants equals the total mass of the products.

Front

Why is it incorrect to say that gases weigh nothing?

Back

Gases have mass, even though they may be less dense than solids or liquids. They must be accounted for in chemical reactions.

Front

If 24 g of magnesium reacts with 38 g of fluorine, what is the mass of magnesium fluoride produced?

Back

62 g of magnesium fluoride is produced, as mass is conserved.

Front

What should be the total mass of products if the reaction starts with 20 g of reactants?

Back

The total mass of products should also be 20 g, according to the Law of Conservation of Mass.

Front

How do you balance a chemical equation?

Back

A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.

Front

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

Back

A balanced chemical reaction has the same number of each type of atom on both sides of the equation.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

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.

Front

What is the significance of coefficients in a balanced equation?

Back

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

Front

What is the role of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.