8.5E - Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that in a closed system, the mass of the reactants must equal the mass of the products in a chemical reaction.

Front

If a reaction starts with 20g of reactants, how much mass should the products have?

Back

20g of products.

Front

What are reactants in a chemical equation?

Back

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

Front

In the reaction A + B -> C, if A is 5g and C is 9g, how much should B weigh?

Back

4g.

Front

What is a balanced chemical reaction?

Back

A chemical reaction is balanced when both sides have the same number of atoms for each element.

Front

What happens to mass during a chemical reaction?

Back

Mass is neither created nor destroyed; it is conserved.

Front

What is the total mass of a solution made from 125g of sugar, 250g of water, and 5g of flavoring?

Back

380g.

Front

What are products in a chemical equation?

Back

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

Front

What does it mean to balance a chemical equation?

Back

To balance a chemical equation means to ensure that the number of atoms of each element is the same on both sides of the equation.

Front

What is the significance of coefficients in a chemical equation?

Back

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