Daily Lesson Information
Day/Dates :
Lesson
Focus:
Lesson
Objectives:
Balancing Equations practice
SWBAT: balance a chemical equation using pictures
SWBAT: balance a chemical equation using multiplication of atoms
(Performance Descriptors)
Students will be able
to:
ILS
(Illinois Learning
Standards)
CRS
(College Readiness
Standards)
Reading
Strategies
Materials:
Word of the Day
Bell Work:
Inquiry
12.C.4b Analyze and explain the atomic and nuclear structure of
matter.
Understand basic scientific terminology
Translate information into a table, graph, or diagram
Computer w/internet
balance
Engage
Explore
Explain
Elaborate
Evaluate
(Circle all that apply)
Before: Students will be asked to draw a picture representing a given
chemical equation.
Instructional
Activities:
Detailed narrative
(description) of ALL
instructional strategies
and tools.
During: Using the online simulation, students will have to add more
molecules in order to make the equation balanced. Students can check
their work by counting up the atoms to make sure they add up correctly
and when they receive the smiley face.
After: Students will be given the opportunity to balance ever
increasingly difficult equations. They will record their score as they
move through the 3 levels.
Modifications:
Assessment:
Measuring tools to
assess student mastery
of lesson’s objectives.
Homework:
Counting atoms in a picture. Using a balance diagram. Using a bar
graph.
Practice problem score. Self evaluation.
Name_____________________________________
Date______________ Period _______________
Balancing Chemical Reactions
PhET Simulation
Go to the following website. http://tinyurl.com/63yma4y
Click on the
button.
tab, click on the button labeled “Bar Charts”.
On the
Review
1. The reactants in a chemical reaction are located to the (left of the arrow / right of the arrow).
2. The small numbers written after the element symbol are called (subscripts / coefficients).
3. The big numbers written before the molecule are known as (subscripts / coefficients).
4. If no number is written as the subscript or coefficient, then a number of _______ is implied.
5. Why do we balance chemical reactions? ______________________________________________
__________________________________________________________________________________
Activity
You will be balancing each chemical reaction. Click on the button labeled “Make Ammonia”. Change
each of the coefficients for each molecule balance the reaction. You will know it is balanced when you
see the
. Go through the 3 reactions and fill in the information below once it is balanced.
Make Ammonia
______ N2 + ______ H2  _______ NH3
How many molecules are
there for each chemical?
How many atoms are there
for each element on each
side of the arrow?
N=
Separate Water
______ H2O  ______ H2 + ______ O2
H=
N=
H=
How many molecules are
there for each chemical?
How many atoms are there
for each element on each
side of the arrow?
H=
O=
H=
O=
______ CH4 + ______ O2  ______ H2O + ______ CO2
Combust Methane
How many molecules are
there for each chemical?
How many atoms are there
for each element on each
side of the arrow?
C=
H H=
O=
C=
H=
O=
Summary for Balancing Reactions
1. Do you need the same number of each element in a reaction? ________ Explain how you know.
2. The coefficients you filled in are the same as the number of (atoms / molecules).
3. How would you mathematically determine the number of atoms for each element using the
balanced chemical reaction?
4. When you balance reactions, you add coefficients. Why can’t you add or change the subscripts in
the chemical formula?
5. What is the smallest coefficient you can have when balancing? ________ Why would you not
want to use a coefficient of 0 to balance any reaction?
__________________________________________________________________________________
Balancing Game
Click on the
tab. Start on level 1. Leave the timer on. Record your data below.
Score
1st Attempt
Level 1
Level 2
Level 3
2nd Attempt
Best Time