Chemical Reactions and Conservation of Mass Quiz

What does the law of conservation of mass state about matter during a chemical reaction?

• Matter is created.

• Matter is destroyed.

• Matter changes form but is not created or destroyed.

• Matter disappears.

What happens during a chemical reaction?

• Substances are converted into different substances.

• Substances disappear completely.

• Substances remain unchanged.

• Substances are created from nothing.

How are chemical elements represented in the periodic table?

• By numbers only.

• By colors.

• By symbols, which are capital letters or a combination of capital and lowercase letters.

• By shapes.

What does a chemical equation tell the reader?

• The color of the substances involved

• The amount and type of elements involved

• The temperature at which the reaction occurs

• The speed of the reaction

What are the substances on the left side of a chemical equation called?

• Products

• Catalysts

• Reactants

• Inhibitors

What does the arrow in a chemical equation represent?

• The start of the reaction

• The end of the reaction

• Yields or produces

• The speed of the reaction

In the chemical equation for rust, what does Fe represent?

• Oxygen

• Iron

• Hydrogen

• Carbon

What is the role of coefficients in a chemical equation?

• They indicate the temperature of the reaction

• They tell the number of units needed or produced

• They show the speed of the reaction

• They indicate the color change in the reaction

What does the Law of Conservation of Mass state?

• Matter can be created and destroyed during chemical reactions.

• Matter cannot be created or destroyed during chemical reactions.

• The mass of reactants is always greater than the mass of products.

• The mass of products is always greater than the mass of reactants.

How can you verify the conservation of mass in a chemical reaction?

• By changing the temperature of the reaction.

• By comparing the mass of the reactants and products.

• By altering the pressure of the reaction.

• By adding more reactants to the reaction.