Download Reactants (add energy) Products

GED SCIENCE LESSON 16
CHEMICAL REACTIONS
Competency: Characterize the components of a chemical reaction.
Learning Objectives:
1. Explain what happens during an exothermic and endothermic chemical reaction.
2. Distinguish between a balanced and unbalanced chemical reaction.
Learning Activities:
___1. Read pgs. 174-181 Steck-Vaughn GED Science text and answer all the questions.
___2. Log on at http://www.myskillstutor.com and complete the Chemical Reactions and
Matter
exercises under Science I - Physical Sciences.
___3. Watch a movie about The Four Types of Chemical Reactions by Barbara Liang
at the Wisconsin Online Resource Center.
http://www.wisc-online.com/objects/index.asp?objD=AP13004
___4. Study an animated pH scale at John Kyrk’s Website.
http://www.johnkyrk.com/pH.html
___5. Write out the balanced chemical equation for photosynthesis indicating the
reactants and products.
___6. Classify cellular respiration and photosynthesis as either endothermic or
exothermic chemical reactions.
___7. Design your own chemical reaction and balance it using elements of your choice.
___8. Fill out the Chemical Equations worksheet located on the next page.
1
GED SCIENCE LESSON 16
Chemical Equations Worksheet
Read about Chemical Equations in the GED reference text and use this activity to
explore how to balance them.
Parts of a Chemical Equation:
Reactants
C
+
(add energy)
O
(=)
Products
CO
2
1 atom Carbon
2
2 atoms Oxygen
(1 molecule Oxygen)
1 molecule Carbon Dioxide
(1 atom Carbon with 2 atoms Oxygen)
2C
+
2O
2 CO
2
2
( )
( )
( ) ( )
How many atoms of each element are on each side of the above chemical equation which
shows 2 molecules of Carbon Dioxide? Fill in the ( ) above.
Hint: The “big sized” numbers are coefficients and mean that the element atoms after it
need to be multiplied by that number. Don’t forget to multiply in the “little sized”
numbers too.
Since matter cannot be created from nothing or destroyed into nowhere, the numbers of
each element on one side of the arrow must equal the numbers on the other. If this is
written correctly, the equation is considered balanced. Is the equation below balanced?
What two life processes does it represent?
6CO2 + 6H2O + (light /energy)
2
C6H12O6 + 6O2