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 total mass of reactants before a chemical reaction is equal to the total mass of products after the reaction. Matter cannot be created or destroyed.

Front

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

Back

The products should have a total mass of 20g.

Front

What happens to matter during a chemical reaction according to the Law of Conservation of Mass?

Back

Matter is transformed or changed, but the total mass remains constant.

Front

What is an open system in terms of matter and energy exchange?

Back

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

Front

What is a closed system in terms of matter and energy exchange?

Back

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

Front

In a combustion reaction, which element is always a reactant?

Back

Oxygen is always a reactant in a combustion reaction.

Front

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

Back

When a substance is heated in an open container, some particles may escape as gas, leading to a decrease in mass.

Front

What does it mean when we say matter cannot be destroyed?

Back

It means that during a chemical reaction, matter can change forms but cannot be lost or created.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the mass of reactants equals the mass of products, in accordance with the Law of Conservation of Mass.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.