Law of Conservation of Mass 8th grade

Front

What is the law of conservation of mass?

Back

The mass of the reactants equals the mass of the products.

Front

What is a coefficient in a chemical equation?

Back

A number in front of a compound or element that indicates how many molecules or atoms are present.

Front

What do endothermic reactions do?

Back

They take in energy from their surroundings.

Front

What do exothermic reactions do?

Back

They release energy into their surroundings.

Front

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

Back

4g

Front

What is a reactant?

Back

A substance that undergoes a chemical change in a reaction.

Front

What is a product?

Back

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

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the role of energy in chemical reactions?

Back

Energy is either absorbed or released during chemical reactions, affecting the reaction's temperature and stability.

Front

What is a balanced chemical equation?

Back

An equation where the number of atoms for each element is the same on both sides, reflecting the law of conservation of mass.