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

In a chemical reaction, if 5g of reactant A and 9g of product C are involved, how much does reactant B weigh?

Back

4g

Front

What does the coefficient in a chemical equation represent?

Back

The coefficient indicates the number of molecules or moles of a substance involved in the reaction.

Front

What is a molecule?

Back

A molecule is a group of atoms bonded together.

Front

If 24 g of magnesium reacts with 38 g of fluorine, what is the mass of magnesium fluoride produced?

Back

62 g

Front

What happens to the total mass during a chemical reaction?

Back

The total mass remains constant; it does not change.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a 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 is the difference between a coefficient and a subscript in a chemical formula?

Back

A coefficient indicates the number of molecules, while a subscript indicates the number of atoms of an element in a molecule.

Front

If 10g of reactants are used in a reaction, what will be the mass of the products?

Back

10g, according to the Law of Conservation of Mass.