Exp 3 Rearranging planetsREV

Laboratory Activity
INTRODUCTION
1 REARRANGING PLANETS
In this experiment, you will examine the four basic types of chemical reactions:
synthesis, decomposition, single displacement, and double displacement. Chemical
reactions are basically described through the use of chemical equations. In a chemical
equation, the starting substances, called reactants, are placed on the left of the arrow
(). The substances produced, called products, are written on the right side of the
arrow.
Since atoms are neither created nor
destroyed in any reaction, a chemical
equation must have an equal number of
atoms of each element on each side of the
arrow. When this is observed, the equation
is balanced.
MATERIALS
 Chemicals
 Copper(II)carbonate
 Glassware and Equipment
 5 mL 6M hydrochloric acid  sand paper
 5 mL potassium chromate  crucible tong
 10 drops lead nitrate solution  small test tubes
 5 mL limewater  wooden splint
 magnesium ribbon  right- angled glass tubing
 zinc  stopper
 bunsen burner
RED ALERT!!!
PROCEDURE
Before you proceed, read the following.
Lead (II) nitrate may cause skin
A. Synthesis irritation. Avoid skin contact.
1. Obtain a piece of magnesium Handle acids with care.
ribbon. Remove the tarnish by
rubbing with sandpaper. Note its
properties.
Ateneo de Manila High School 1

2. Hold it with a pair of tongs over a flame. Collect the ash using an evaporating dish
and note its properties.
B. Decomposition
1. Pour about 5 mL of limewater into a small beaker. Observe its properties.
2. Obtain two spatulas of copper (II) carbonate and place it in a clean, dry test tube.
Observe its properties. Stopper the test tube with a stopper that has an inserted
right angle glass tubing.
3. Place the end of the right-angle glass tubing in a beaker filled with limewater
solution.
4. Using a test tube holder, heat the test tube containing the copper (II) carbonate
while holding the end of the glass tube in the limewater solution. Continue
heating until a change in the limewater
is observed. A cloudy appearance in
the limewater indicates the presence
of carbon dioxide gas.
5. Remove the tube from the limewater
before removing the heat from the test
tube containing the copper (II)
carbonate.
6. Observe the properties of the material
inside the test tube.
C. Single Displacement
1. Place a small piece of zinc in a test tube. Observe the properties.
2. Add 5 mL of 6M HCl. Observe what happens.
3. Cover the test tube using the rubber stopper with inserted an right–angle glass
tubing.
4. Insert the other end of the glass tubing into an
inverted, empty test tube. The inverted, empty test
tube will be used to collect the gas that passes
through the glass tubing from the test tube
containing zinc and hydrochloric acid.
5. After 3-5 minutes, remove the glass tubing from the
empty test tube. While keeping the tube inverted,
bring a lighted splint near its mouth. A “pop”
indicates the presence of hydrogen gas.
D. Double displacement
1. Add 5 mL potassium chromate solution into a large test tube. Observe and note
its properties.

2. Add 10 drops of lead nitrate solution into the same test tube. Observe the
formation of a precipitate.
DATA AND OBSERVATIONS

Parts Reactants and their Products and their
properties properties
A
B
C
D
GUIDE QUESTIONS for ANALYSIS

1. For each part of the experiment, cite all possible observations (change in color,
formation of a precipitate, etc) that prove that a chemical reaction took place.
2. Explain why or how each part of the experiment is specifically classified under such
type of reaction.
3. Write the (a) word equation and (b) balanced chemical equation for each given
reaction.
4. List three things or activities that you commonly observe at home that involves a
chemical reaction. How do you use your senses (sight, hearing, taste, touch and smell)
to detect if chemical changes are involved?
ENRICHMENT
A hot pack is used to warm hands and feet. When

the package is opened, oxygen from the air
penetrates a bag containing solid chemicals. The
resulting reaction produces heat for several hours.

Exp 3 Rearranging planetsREV

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Laboratory Activity

Ateneo de Manila High School 1

Ateneo de Manila High School 2

DATA AND OBSERVATIONS

GUIDE QUESTIONS for ANALYSIS

A hot pack is used to warm hands and feet. When

Ateneo de Manila High School 3

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