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 the reactants equals the total mass of the products.

Front

Which of the following is not a chemical reaction?

Back

Melting of ice.

Front

What does the coefficient in a chemical formula represent?

Back

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

Front

What is a molecule?

Back

A molecule is a group of atoms bonded together.

Front

True or False: Gases weigh nothing and do not need to be accounted for in a reaction.

Back

False.

Front

How do you balance a chemical equation?

Back

You adjust the coefficients in front of the compounds to ensure that the number of atoms for each element is the same on both sides of the equation.

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 significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the Law of Conservation of Mass is upheld, meaning the same number of each type of atom is present before and after the 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.