Law of Conservation of Mass/Energy

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that matter cannot be created or destroyed in a chemical reaction; it can only be transformed from one form to another.

Front

What happens to the total mass of reactants in a chemical reaction?

Back

The total mass of reactants before a chemical reaction is equal to the total mass of products after the reaction.

Front

What does it mean for matter to be transformed?

Back

To be transformed means that matter changes from one form to another, such as from solid to liquid, but the total mass remains the same.

Front

Can energy be created or destroyed?

Back

No, according to the Law of Conservation of Energy, energy cannot be created or destroyed; it can only be converted from one form to another.

Front

What is an open system?

Back

An open system is a system that can exchange both matter and energy with its surroundings.

Front

What is a closed system?

Back

A closed system is a system that can exchange energy but not matter with its surroundings.

Front

What is an example of a chemical reaction where mass is conserved?

Back

Burning wood is an example; the mass of the wood and oxygen used equals the mass of the ash, carbon dioxide, and water produced.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the number of atoms of each element is the same on both sides, reflecting the conservation of mass.

Front

What is the difference between reactants and products?

Back

Reactants are the starting substances in a chemical reaction, while products are the substances formed as a result of the reaction.

Front

What is an example of a physical change?

Back

Melting ice is a physical change; the ice transforms into water, but the mass remains the same.