Chemical Reactions and Elements Quiz

What occurs during a chemical reaction?

• Substances are created from nothing.

• Substances are converted to different substances.

• Substances disappear completely.

• Substances remain unchanged.

What does the periodic table list?

• The names of all animals.

• The chemical symbol for each element.

• The names of all countries.

• The symbols for all planets.

How is a chemical symbol indicated?

• By a number.

• By a color.

• By a capital letter or a capital letter and a lowercase letter.

• By a shape.

What happens when hydrogen peroxide is mixed with yeast and liquid soap?

• It turns into a solid.

• It breaks down into oxygen gas and water.

• It becomes a metal.

• It remains unchanged.

What does a chemical equation use to describe what happens in a chemical reaction?

• Words and sentences

• Chemical symbols and numbers

• Pictures and diagrams

• Colors and shapes

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

• Products

• Reactants

• Catalysts

• Solvents

What do coefficients in a chemical equation indicate?

• The number of atoms in a molecule

• The number of units needed or produced

• The temperature of the reaction

• The speed of the reaction

In the chemical equation for rust, what are the reactants?

• Fe and O

• Fe and H

• O and H

• Fe and N

What is the product formed in the chemical equation for rust?

• FeO

• Fe2O3

• Fe3O4

• FeO2

What does the word "yield" mean in the context of a chemical equation?

• To stop

• To produce or result in

• To divide

• To subtract