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 reactants equals the total mass of products.

Front

In a reaction A + B --> C, if A has 5g and C has 9g, how many grams does B have?

Back

4g

Front

If Bob puts 200 grams of ice into 900 grams of water, how much total mass is in the pitcher after the ice melts?

Back

1,100 g

Front

What does the subscript in a chemical formula represent?

Back

The subscript indicates the number of atoms of an element in a molecule.

Front

What is the coefficient in the chemical formula 3H2O?

Back

3

Front

How many hydrogen atoms are in the product of the reaction 2SO2 + 2H2O2 --> 2H2SO4?

Back

4

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 difference between a coefficient and a subscript in a chemical equation?

Back

A coefficient indicates the number of molecules, while a subscript indicates the number of atoms in a molecule.

Front

If 10g of substance A reacts with 15g of substance B, what is the total mass of the products?

Back

25g