Law of Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

Front

What does the coefficient (3) in the chemical formula 3H₂O represent?

Back

It represents 3 molecules of water.

Front

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

Back

4g

Front

If Bob puts 200 grams of ice into a pitcher with 900 grams of water, how many grams of water does he have after the ice melts?

Back

1,100 g

Front

How many sulfur atoms are present in the reactants of the equation: 2SO₂ + 2H₂O₂ --> 2H₂SO₄?

Back

2

Front

What is the principle behind the Law of Conservation of Mass?

Back

The total mass of reactants equals the total mass of products in a chemical reaction.

Front

What happens to mass during a physical change?

Back

Mass remains constant; it is neither created nor destroyed.

Front

In a balanced chemical equation, what must be true about the number of atoms of each element?

Back

The number of atoms of each element must be the same on both sides of the equation.

Front

What is a reactant in a chemical reaction?

Back

A substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A substance that is formed as a result of a chemical reaction.