Chemical Reactions Test

Check ALL the boxes that show the signs of a chemical change.

• smell

• air

• color change

• gas (bubbles) produced

• forces

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

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

• Product

• Reactant

• Starters

• Enders

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.
• Matter can only be lost in a chemical reaction.
• Matter can only be gained in a chemical reaction.
• Matter can be gained and lost in a chemical reaction. 

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

How many atoms of carbon (C) are in C₆H₁₂O₆?

• 3
• 6
• 12
• 24

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

In reactions, products must be equal to..

• Products

• Reactants

• Starters

• Enders

How do we know a chemical reaction has taken place?

• Substances change in appearance

• Substances change in size

• Substances change in states, like from a liquid into a solid.

• New substances are formed