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.

Front

What does it mean for a chemical reaction to be balanced?

Back

A chemical reaction is balanced when both sides have the same number of atoms for each element involved.

Front

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

Back

False. Gases have mass and must be accounted for in the total mass.

Front

If a reaction starts with 50g of reactants, what will be the mass of the products?

Back

The mass of the products will also be 50g, according to the Law of Conservation of Mass.

Front

What is mass?

Back

Mass is a measure of the amount of matter in an object, typically measured in grams or kilograms.

Front

What happens to the mass of reactants during a chemical reaction?

Back

The mass of the reactants remains the same before and after the reaction; it is conserved.

Front

What is the relationship between reactants and products in a chemical reaction?

Back

The total mass of the reactants is equal to the total mass of the products.

Front

What is an example of a chemical reaction that demonstrates the Law of Conservation of Mass?

Back

Burning wood: The mass of the wood and oxygen before burning equals the mass of the ash, carbon dioxide, and water vapor produced.

Front

What is the significance of coefficients in a balanced chemical equation?

Back

Coefficients indicate the number of molecules or moles of each substance involved in the reaction, ensuring mass balance.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.