Download EXPERIMENT 4 CLASSES OF CHEMICAL REACTIONS

Chem 120, Summer Quarter 2012
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Quiz Section No.:
EXPERIMENT 4  CLASSES OF CHEMICAL REACTIONS
A) Combination Reactions:
1) Heating of aluminum:
Observation:
Chemical Equation:
2) Heating of copper:
Observation:
Chemical Equation:
B) Decomposition Reactions:
1) Decomposition of ammonium carbonate: All observations
2) Decomposition of potassium iodate: Observations and chemical equations
3) Reactions of silver nitrate: Observations and chemical equations
Test tube no. 1
Test tube no. 2
Test tube no. 3
4) Compound formed in test tube no. 1 after heating
POST-LAB REPORT
Chem 120, Summer Quarter 2012
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Quiz Section No.:
C) Single Replacement Reactions
Test tube
no.
Solution
Metal
1
H 2O
Ca
2
H 2O
Fe
3
H 2O
Cu
4
3 M HCl
Zn
5
6 M HCl
Pb
6
6 M HCl
Cu
7
0.1 M
NaNO3
0.1 M
CuCl2
Al
0.1 M
AgNO3
Cu
Test tube
no.
Solution
Metal
1
H 2O
Ca
2
H 2O
Fe
3
H 2O
Cu
4
3 M HCl
Zn
5
6 M HCl
Pb
6
6 M HCl
Cu
7
0.1 M
NaNO3
0.1 M
CuCl2
Al
0.1 M
AgNO3
Cu
8
9
8
9
Observations
Al
Al
Balanced chemical equations
Chem 120, Summer Quarter 2012
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Quiz Section No.:
D) Double Replacement Reactions
Test tube
no.
Solution 1
Solution 2
1
0.1 M NaCl
0.1 M
KNO3
2
0.1 M NaCl
0.1 M
AgNO3
3
0.1 M
Na2CO3
3 M HCl
4
3 M NaOH
3 M HCl
5
0.1 M BaCl2
3 M H2SO4
6
0.1 M
Pb(NO3)2
0.1 M
K2CrO4
7
0.1 M
Fe(NO3)3
0.1 M
Cu(NO3)2
3 M NaOH
Test tube
no.
Solution 1
Solution 2
1
0.1 M NaCl
0.1 M
KNO3
2
0.1 M NaCl
0.1 M
AgNO3
3
0.1 M
Na2CO3
3 M HCl
4
3 M NaOH
3 M HCl
5
0.1 M BaCl2
3 M H2SO4
6
0.1 M
Pb(NO3)2
0.1 M
K2CrO4
7
0.1 M
Fe(NO3)3
3 M NaOH
8
0.1 M
Cu(NO3)2
3 M NaOH
8
Observations
3 M NaOH
Balanced Chemical Equations
Chem 120, Summer Quarter 2012
Page 4 of 4
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Quiz Section No.:
ANSWERS TO QUESTIONS:
1.
Gold metal, Au, is valuable not just because it is rare but also because it is so durable. Au will not dissolve in
hydrochloric acid or nitric acid. It takes a combination of the two to dissolve gold. Calcium metal, Ca, on the
other hand reacts with water, H2O, to form Ca2+ ions. What information presented in this lab could enable
you to predict this difference in reactivity.
2.
From the following list of chemicals, select three combinations that would lead to a double displacement
reaction. Write the complete, balanced equations for the reactions.
LiBr
3.
HNO3
AgNO3
Pb(NO3)2
Na2SO4
Potassium chlorate, KClO3, decomposes upon heating. Explain what is meant by a decomposition reaction.
Write the complete balanced equation for the decomposition. What gas is given off, and how may it be
detected? What chemical can be used to detect the remaining salt? Write and balance the chemical
equation for this reaction.