Lesson 6 & 7

A chemical reaction occurs when two or more substances combine to make a new substance.

• True

• False

How can you tell that you have a new substance?

• The properties of the new substance are the SAME as the original substance.

• The properties of the new substance are DIFFERENT than the original substance.

• You cannot determine if you have a new substance by testing the properties.

If the properties of a substance change,

• a chemical reaction occurred

• a chemical reaction did not occur.

• properties don't relate to a chemical reaction.

Burning is an example of a

• substance

• chemical reaction

• mixture

When a chemical reaction occurs it creates a

• old substance

• new substance

In the chemical equation above, what is the reactant(s)?

• Road Salt

• Baking Soda

• Chalk

• Table Salt

In the chemical equation above, what is the product(s)?

• Road Salt

• Baking Soda

• Chalk

• Table Salt

What does the arrow (->) represent in a chemical equation?

• "Equals"

• "Turns into"

• "Different"

A chemical reaction occurs when 2 or more substances combine to make a new substance. In the burning magnesium activity, what did the magnesium combine with to make the magnesium oxide?

• Carbon Dioxide

• Fire

• Oxygen

A chemical reaction for the burning magnesium can be written like 2Mg + O₂ -----> 2MgO. Is that called a chemical equation or a chemical formula?

• Chemical Equation

• Chemical Formula