Chemical Reactions

What is a chemical
Reaction

A chemical reaction is a
process in which atoms of one
or more substances rearrange
to form one or more NEW
substances

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What are some signs that a chemical reaction has occurred?

▪ Formation of Bubbles (Baking soda

and Vinegar)

▪ Change in Energy (Heat or Light)
▪ Change in odor (Food Rotting)
▪ Change in color (Leaves changing)

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What is the only proof
of that a chemical
reaction has
occurred?

The Creation of New
substances!

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Signs of a
Chemical
Reaction

THe Glow Stick

8

What are some ways we can change the rate of reaction?

9

Temperature
Concentration
Surface Area
Increase Pressure
Use a catalyst

Watch the reaction of the glow stick as it is placed in the different temperature waters?

10

Watch as the teacher increases the surface area of the reactants and its impact on the rate of reaction

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Old Foamy

Using a Catalyst

Watch as the teacher combines 3 different
materials

Hydrogen Peroxide

H2O2

Dishwashing Liquid

(Mixture) Used to
trapped gas given
off by Hydrogen
Peroxide

Sodium Iodide
(Catalyst for
Reaction)

NaI

13

The reaction we saw has the equation

2 H2O2 → 2 H2O + O2 + Energy

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Teacher Demonstration

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