Chemical Reactions Test

When a new substance forms as a result of a chemical reaction, what type of change has occurred?

• Chemical Change

• Physical Change

Which is NOT an indication of a chemical change?

• Temperature Change

• Shape Change

• Formation of a precipitate

• Production of light

What is the left part of a chemical equation called?

2H_{2 +} O₂ --> 2H₂O

• Reactants

• Yields

• Products

• Chemical Equation

What is the right part of a chemical equation called...

2H_{2 +} O₂ --> 2H₂O

• Reactants

• Yields

• Products

• Chemical Equation

True or False

In a chemical reaction, no new atoms are created, and no atoms are destroyed.

• TRUE

• FALSE

How many total atoms are in this compound? Al₂O₃

• 2

• 5

• 6

• 3

Is a copper penny turning greenish after a few years a chemical or physical change?

• Chemical Change

• Physical Change

How would you describe this chemical formula?

3O

• 3 Oxygen molecules

• 3 Oxygen atoms

• 3 Oxygen elements

• 3 Oxygen compounds

Which chemical equation matches the model shown?

• 3C + 4O --> 3CO2

• 3C + 2O2 --> 3CO2

• C3 + 4O --> 3CO6

• C3 + 2O2 --> 3CO6

When vinegar and baking soda are combined, bubbles and foam are produced.

What evidence demonstrates that a chemical change has occurred?

• A color change occurs.

• A gas is formed.

• A solid is dissolved.

• A precipitate is formed.