Conservation of Mass

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

• A physical change forms a new substance, while a chemical change does not.

• A physical change alters the shape or form of matter without forming a new substance, while a chemical change forms a new substance.

• A physical change is irreversible, while a chemical change is reversible.

• A physical change involves a chemical reaction, while a chemical change does not.

In a chemical reaction, what are the substances that change and the new substances that form called?

• Reactants are the new substances formed, and products are the substances that change.

• Reactants are the substances that change, and products are the new substances formed.

• Both are called solutions.

• Both are called mixtures.

What does the scientific rule of Conservation of Mass state?

• Mass can be created or destroyed, but only in chemical reactions.

• Mass is always lost during physical changes.

• Mass is never made or lost.

• Mass only applies to solids and liquids, not gases.

When sugar dissolves in water, what type of change occurs, and what happens to the total mass of the mixture?

• A chemical change occurs, and the total mass decreases.

• A physical change occurs, and the total mass remains the same.

• A chemical change occurs, and the total mass increases.

• A physical change occurs, and the total mass decreases.