Expert answer:Identify different types of reactions chemistry la
Expert answer:Identify different types of reactionsPredict the products of reactionsBalance chemical equationsDemonstrate safety precautions while performing experimental proceduresmore info in the documents below there is also an anwser sheet!
5.12classifying_reactions___directions__4_.pdf
5.12classifying_reactions___answer_sheet__2_.pdf
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Unit 5.12 Portfolio:
Classifying Reactions Directions
Safety Reminder:
Wear safety glasses for all experiments.
Objectives
1. Identify different types of chemical reactions as synthesis, decomposition, single
replacement, or double replacement.
2. Predict the products of reactions.
3. Understand and balance chemical reactions.
Overall Directions:
There are 4 different activities. For each activity choose to follow the virtual or
real life directions when the option is available.
The answer sheet is separate. At the conclusion of each test, complete the table
for that part BEFORE moving on to the next test.
Part #1: Reaction Between Iron and Oxygen
Materials:
2 small glass jars, cups, or bowls
steel wool, water, vinegar, salt
tweezers, scissors, stopwatch/timer, graduated cylinder (from science kit)
Virtual Procedure:
A. Click on this link and watch the reaction of iron rusting.
NOTE: the video shows a different experiment that is faster than the one below,
but you will be able to see what happens in order to record your observations.
B. Complete the table for part #1 on the answer sheet.
Real Life Procedure:
1) Cut a small piece of steel wool about the size of a quarter and place in one of the glass
containers.
a. NOTE: avoid using steel wool coated with soap or cleaning agents of any kind. The
experiment will fail with this type of steel wool.
2) Pour just enough vinegar in the container to cover the steel wool.
a. The vinegar is to remove the protective coating that may be on the steel wool
commonly used for scrubbing dishes.
3) Let the vinegar and steel wool sit undisturbed for 5-10 minutes. Then pour off the
excess vinegar in the sink.
4) In the 2nd glass container (the one that is empty and unused) add 40mL of water. Then
add ½ tablespoon of salt to the water. Carefully swirl the mixture until all the salt is
dissolved.
a. If the salt is not dissolving, then add a little more water until all the salt
dissolves.
5) Remove the steel wool from the first container and add it to the salt water mixture. Let
this container sit undisturbed for 30 minutes to 1 hour.
a. Rust should start forming within 20 minutes. If nothing is happening, then try
pouring off a little saltwater so the top of the steel wool is in the open air and
the bottom of the steel wool is in the salt water. If nothing is happening after
another 1 hour, then something else is going on with the reaction causing it to
not work or go too slowly; watch the video.
6) CLEANUP: Once rust has formed (or nothing has happened after several hours), pour
the liquid down the sink. The steel wool can be rinsed and used for cleaning dishes or
toss the used steel wool in the recycling/trash.
7) Complete the table for part #1 on the answer sheet.
Part #2: Reaction Between Hydrogen Peroxide and a Potato
Materials:
potato, hydrogen peroxide
knife
graduated cylinder (from science kit)
Virtual Procedure:
A. Click on this link and watch the reaction of hydrogen peroxide and the catalase in the
potato.
B. Complete the table for part #2 on the answer sheet.
Real Life Procedure:
1) Make sure a parent or another adult is standing by watching. Carefully cut a small cube
out of the potato. The cube should be small enough to fit in the 100mL graduated
cylinder that came in the science kit.
2) Pour enough hydrogen peroxide into the graduated cylinder to cover the potato. Then
add 5mL more of hydrogen peroxide.
3) Watch the reaction and complete the table for part #2 on the answer sheet.
a. Visible signs of a reaction should happen immediately or within 5 minutes. If no
visible signs occur, then watch the video because the potato or hydrogen
peroxide is probably too old to react.
CLEANUP: Pour the hydrogen peroxide down the sink and run the water for at least 5 seconds.
Toss the used potato in the trash.
Part #3: Reaction of Zinc and Hydrochloric Acid
Virtual Procedure:
A. Click on this link and watch the reaction of zinc and hydrochloric acid.
B. Complete the table for part #3 on the answer sheet.
Real Life Procedure:
There is a test (identified in the original lesson directions) involving a penny made after 1982, but it
will not be a complete reaction in the time frame needed to complete this portfolio because
vinegar is too weak of an acid. If you want to try the experiment anyway, then refer to the
direction sheet in the lesson.
Part #4: Reaction Between Baking Soda and Vinegar
Materials:
baking soda (sodium bicarbonate), vinegar (acetic acid)
graduated cylinder (from science kit)
measuring spoons, measuring cups
1 drinking container large enough to hold ¾ cup of liquid
Virtual Procedure:
A. Click on this link and watch the reaction of sodium bicarbonate (baking soda) and
acetic acid (vinegar).
B. Complete the table for part #4 on the answer sheet.
Real Life Procedure:
1) CAUTION: do this experiment in the sink, bathtub, or outside to catch the mess.
a. The reaction happens fast so bring all materials to the sink, bathtub, or outside
area BEFORE starting.
2) Place the 100mL graduated cylinder in the center of the sink or bathtub.
a. If outside: make sure graduated cylinder can stand on its own and will not tip
over.
3) In the drinking container, add ½ cup of vinegar and ¼ cup of warm water.
4) Add 2 tablespoons of baking soda to the 100mL graduated cylinder.
5) Carefully, but quickly, pour the vinegar/water mixture into the graduated cylinder.
4) Observe the reaction and complete the table for part #4 on the answer sheet.
6) CLEANUP: all materials can be washed down the sink or bathtub.
a. If outside: then spray water over the test area with a garden hose or pour a
pitcher of water over the area.
Unit 5.12 Portfolio:
Classifying Reactions –
Answer Sheet
Part
#
1
Visible Signs of
a Reaction
Observations
Balance the equation for the reaction between steel wool and oxygen.
Fe
2
+
O2
Fe2O3
Balance the equation for the reaction of hydrogen peroxide in the presence of
catalase.
H2O2
3
Type of
Reaction
H2O
+
O2
Balance the equation for the reaction between zinc and hydrochloric acid.
Zn
+
HCl
ZnCl2
+
H2
Hint: there are two.
4
Balance the equations below for the reaction of acetic acid and sodium bicarbonate
NaHCO3
+
HC2H3O2
H2CO3
NaHCO3 +
HC2H3O2
H2O
NaC2H3O2
+
+
H2CO3
CO2
NaC2H3O2 +
H2O +
CO2
…
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