Chemical Reactions Quiz-Reading Material

What is a chemical reaction?

• A process in which matter disappears

• A process in which atoms are destroyed

• A process in which atoms are rearranged

• A process in which new substances are formed

What is the Law of Conservation of Matter?

• Matter cannot be created or destroyed, atoms can only rearrange themselves in a chemical reaction

• The total number of atoms changes in a chemical reaction

• Atoms can only rearrange themselves in a physical change

• Matter can be created or destroyed in a chemical reaction

What is an example of a physical change?

• Burning of wood

• Melting of ice

• Rusting of iron

• Cooking an egg

What are the products of the chemical reaction: C3H8 (propane) + 5O2 ? 3CO2 + 4H2O?

• C3H8 + 5O2

• 3CO2 + 4H2O

• 4CO2 + 3H2O

• 3CO2 + 5H2O

What happens to the total mass in a chemical reaction?

• It decreases

• It increases

• It stays the same

• It becomes zero

What are some properties of matter?

• Magnetism, reactivity, weight, and color

• Magnetism, flammability, density, and color

• Magnetism, flammability, weight, and odor

• Magnetism, reactivity, density, and odor

What is an example of a chemical reaction?

• Dissolving salt in water

• Melting of ice

• Burning of wood

• Boiling water

What is the result of a physical change?

• Molecules interact with each other

• Atoms rearrange themselves

• Changes of state or phase changes

• New substances are formed

What is the outcome of a chemical reaction?

• Molecules interact with each other

• Matter disappears

• Atoms rearrange themselves

• New substances are formed

What is the purpose of a catalyst in a chemical reaction?

• To speed up the reaction without being used up

• To decrease the total mass

• To increase the total mass

• To slow down the reaction without being used up