LESSON 2 REVIEW CHEMICAL CHANGES

Which observation(s) might be used as evidence that a chemical reaction occurred?

• Color change

• Odor change

• change in temperature

• All of the above

The left side of the equation below is called

• Products
• Reactants

Evidence of a chemical reactions is anything that shows - 

• a new substance has formed
• a solid dissolved in a liquid
• interaction between 2 gases
• a change in the state of matter

You know you a chemical reaction has occurred if 

• there is a precipitate.
• there is a color change.
• there is a temperature change.
• All of these answers are evidence.

This change is a

• chemical reaction

• physical change

• musical change

• all answers are correct

The reactants in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

The products in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

The products are:

• molecular oxygen and 2 carbon

• 2 carbon monoxide

• all of these are products

• all of these are reactants

The reactants are:

• molecular oxygen and 2 carbon

• 2 carbon monoxide

• all of these are products

• all of these are reactants

A substance that is formed as the result of a chemical reaction is a __________________

• Product

• Reactant

• Starters

• Enders