Turn to your Table of Contents and update it with:
Page #
Counting Atoms/Balancing Equations
S Starter
2C9H8O4
4Ca(H2PO4)2
October 22, 2012
C7H5(NO2)3
FeS2
HOMEWORK FOR TONIGHT: BALANCED?
WORKSHEET DUE TOMORROW!!!
P Law of Conservation of Masses
•
Established in 1789 by French Chemist Antoine
Lavoisier
• States that mass is neither created nor destroyed in
any ordinary chemical reaction.
• Or more simply, the mass of substances produced
(products) by a chemical reaction is always equal to
the mass of the reacting substances (reactants).
Video Representation
P Practice
What steps do we take to
balance equations?
1. Write out the different atoms
2. Count the atoms on the reactant and product sides
3. Circle the unbalanced atoms
4. Start with the lowest and add coefficients to balance
out.
Balance the following:
Al + MnO  Al2O3 + 3 Mn
A Apply
Balancing Act Worksheet
C Connection
What questions do I still
have about counting atoms and
balancing equations?
E Exit
½ page reflection on what
you learned today. Make sure to
use key words such as chemical
equation, atoms, coefficient,
subscript, etc.
Turn to your Table of Contents and update it with:
Page #
Balancing Equations Cont
October 23, 2012
Starter: Is this balanced? If not
fix it.
UF4+ Mg→ U+ 2MgF2
• P- Balancing Act Corrections
• A- Teach a Friend (You will be given an equation
strip you will teach your friend how do to the
equation using a white board). You will go
through each step to successfully balance the
equation.
• C- Balanced? Worksheet (If you do not finish its
for homework)
• E- What part of todays lesson benefited you the
most? Explain why?
Turn to your Table of Contents and update it with:
Page #
Chemical Reactions Group Discussion October 24, 2012
S Starter
What is the purpose of a
coefficient and a subscript in
a chemical formula?
Practice
• Let’s go over the clues that tell
you a chemical reaction is
occurring.
Application
• There are 4 activities that you will
be completing with your group.
• You have 5-7 minutes for each
station.
• Read the article and write the
questions and answers in your
Journal.
Connection
• Write and example of a chemical reaction
that you can find in your household.
Exit
• Write a ½ page reflection about what you
learned today.
10.25.12
Dropping Out Lab
S: What is so funny about this joke?
Two scientists walk into a bar...The first
one says “I’ll have some H2O.” The
second says “I’ll have some H2O too.”
Then he dies.
The second guy says H20 (too) as in H202 (meaning hydrogen
peroxide) Hydrogen peroxide is a very unstable substance and
highly reactive. It will kill you.
P
:
Dropping Out Lab
Introduction
In this investigation, you will
observe the mixing of Epsom salts
with household ammonia. These
are both substances that dissolve
in water. Mixing ammonia and
Epsom salts produces magnesium
hydroxide as one of the products.
Magnesium hydroxide is a white
substance that does not dissolve
well in water.
P
:
Dropping Out Lab Materials
250 mL Beaker
10 mL
Ammonia
100 mL Water
Safety
Goggles
5 g Epsom Salt
Stirrer
Timer
Graduated
Cylinder
Balance
P
:
Dropping Out Lab
Procedures
• 1. Put on your safety goggles. Wear
goggles throughout the investigation.
• 2. Pour 100 mL of water in the beaker.
• 3. Measure 5 g of Epsom salts.
Describe the properties of the Epsom
salts.
• 4. Add the Epsom salts to the water in
the beaker, and stir until completely
dissolved.
Dropping Out Lab
Procedures
P
:• 5. CAUTION: Be very careful when working with
chemicals. DO NOT waft or smell the ammonia. It
could be HAZARDOUS to your nose and lungs.
Ammonia has a sharp, strong odor. It can irritate
the eyes and nose membranes.
• 6. Slowly add 10 mL of ammonia at the very edge of
the beaker. DO NOT STIR.
• 7. Allow the beaker to sit undisturbed for at least
five minutes. Observe the reaction, and describe
what is occurring in your journal. (More time will be
required.)
A
:
Dropping Out Lab
• Complete #1-7 then clean
up your area and return
goggles and aprons.
•Sit at your desk and
answer #8-9 in your
journal.
Lab Analysis
C
:1. What do you predict will
happen when the Epsom
salts and the ammonia are
mixed?
2. What type of changes
do you think will take
place? Which parts were
physical changes and
which chemical reactions?
3. What do you think the
precipitate will look like?
E
:
Lab Report
Write a one-paragraph
summary of the
investigation by using your
data/observations and
notes. Create a hypothesis
of what you think will occur
tomorrow.