Law of Conservation of Mass 8th grade

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 the reactants equals the total mass of the products.

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 do endothermic reactions do?

Back

Endothermic reactions take in energy from their surroundings.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound or element in a chemical equation to indicate how many molecules or moles are involved.

Front

What is a subscript in a chemical formula?

Back

A subscript is a number written below and to the right of a chemical symbol that indicates the number of atoms of that element in a molecule.

Front

What do exothermic reactions do?

Back

Exothermic reactions release energy into their surroundings.

Front

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

Back

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

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their quantities.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the Law of Conservation of Mass is obeyed, meaning the number of atoms for each element is the same on both sides of the equation.

Front

What is an example of an exothermic reaction?

Back

Combustion of fuels, such as burning wood or gasoline, is an example of an exothermic reaction.