Chemical Reactions

Chemical Reactions


Created by: Lisa Kendra,
Mt. Diablo Unified School District


Resources Needed:

Your Task: 


All matter is composed of molecules. Molecules are composed of atoms, which consist of a nucleus surrounded by a
cloud of electrons. The nucleus is composed of protons and neutrons, which are themselves composed of quarks. 

For more in depth information on atoms click here!
For the history of the Periodic Table click here!

Extension: Explore the Periodic Table 

Matter can be changed or combined in different ways, by:

 Fact: Mixtures and solutions can be separated.

Click here to play the game, "Junkyard Analysis".  Identify mixtures and solutions!

Air is a mixture!

Chemical reactions - which the atoms to form different molecules (for example, molecules of gaseous hydrogen can be combined with molecules of gaseous oxygen to form liquid water) 

Water is the product of a chemical reaction!

Chemical Reactions:

A chemical reaction occurs when two or more chemical substances are mixed together. This means that the atoms that were joined together in the original substances break apart and rearrange themselves to make a new substance, one or more substances may be transformed into one or more new substances. This new substance is quite different from the original substances.

Reactant + Reactant ----> Product

Some products of chemical reactions are heat, light, sound and changes in color.

Chemical reactions are classified according to the kind of change that takes place.

Examples of Chemical Reactions:


A sparkler contains magnesium. This, when lit, reacts with oxygen in the air and produces light and heat. 


The chemicals inside a rocket, when lit, react with the oxygen in the air and produce heat, light and sound.

Activity #1

Click here to watch a movie about compounds and mixtures and test your knowledge.

Activity #2

Click here and choose an experiment to complete.

Activity #3

Click here to solve the chemical reaction riddles.

Final Quiz

Complete each question recording the answers on a separate piece of paper.

1. A chemical reaction may create heat, light, sound and/or a color change.  These are called ____________.

a. reactants

b. products

c. chemicals

d. atoms

2. When 2 hydrogen molecules react with 1 oxygen molecule what is the product? 

a. carbon dioxide

b. glue

c. water

d. chalk

3. When vinegar, water and baking soda are mixed what is one of the products of the chemical reaction?

a. salt

b. ice

c. chalk

d. carbon dioxide

4. Salt water is an example of a solution or a chemical reaction?

5. Skin tanning is an example of a mixture or a chemical reaction?

6. Trail mix is an example of mixture or a solution?

7. Curled hair is an example of a solution or a chemical reaction?

8. Give three other examples of chemical reactions.


Click on the logo to create your own puzzle at

A Few Internet Resources:


Created August 16, 2002
Last Revised August 16, 2002

Teacher Notes

Suggested Grade Level: 5 to 8 

Science Content Standards: 

Physical Science

Investigation and Experimentation

S.C.O.R.E. Lessons Standards Search by Grade and Subject
S.C.O.R.E. Standards and Framework
California Content Standards Grades K-12
California Content Standards Grades K-12 - Science - PDF Format

 Note to Teachers:

Activity 1 is a lab activity.
Students choose one of the experiments provided at Wondernet to complete.
Activities change on a monthly basis.
You will need to collect different materials based on the monthly experiments provided.


Students need a basic background in internet usage, lab procedures, cooperative team work (timekeeper, supplies, clean-up) and a basic understanding of matter, atoms, mixtures and chemical reactions.


Interpreting data, making inferences, forming hypotheses, making predictions, graphing.
Computer literacy.
Effective use of Internet resources. 




Periodic Table Adventure
Puzzlemaker- students create puzzles using vocabulary from the chemical reactions webquest.