Law of Conservation of Mass 8th grade

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed in a chemical reaction.

Front

What happens in an exothermic reaction?

Back

Exothermic reactions release energy.

Front

If 10 g of a solid chemical reacts with 10 g of a liquid chemical and the product weighs 13 g, how much did the gas produced weigh?

Back

The gas produced weighed 7 g.

Front

If four hydrogen atoms react with two oxygen atoms, how many atoms will be in the product?

Back

6 atoms.

Front

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

Back

4g.

Front

What is an example of a physical change?

Back

Melting ice is a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change.

Front

What does it mean when a reaction is balanced?

Back

A balanced reaction has the same number of each type of atom on both sides.

Front

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

Back

Coefficients indicate the number of molecules or moles of each reactant and product.

Front

What is the difference between reactants and products?

Back

Reactants are substances that start a chemical reaction, while products are substances formed as a result.