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

What are reactants in a chemical reaction?

Back

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

Front

Balance the equation: __P4 + __O2 --> __P2O3

Back

1, 3, 2

Front

If 200 grams of ice melts in 900 grams of water, what is the total mass of water in the pitcher?

Back

1,100 grams

Front

True or False: Gases produced in a reaction do not need to be accounted for because they weigh nothing.

Back

False

Front

What evidence supports the Law of Conservation of Mass in a reaction?

Back

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the 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 happens to the mass of substances during a chemical reaction?

Back

The total mass of substances remains constant; it is conserved.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the number of atoms for each element is the same on both sides of the equation, reflecting the Law of Conservation of Mass.

Front

What is an example of a physical change?

Back

Melting ice is a physical change; the substance changes state but not its chemical composition.