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Chemical Reactions Lab

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Chemical Reactions Lab PbI2 Precipitate D. Double Replacement D2: Solutions of silver nitrate and sodium chromate are mixed. Precipitate Formation AgNO3(aq) + Na2CrO4 ... – PowerPoint PPT presentation

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Title: Chemical Reactions Lab


1
Chemical Reactions Lab
2
A. Synthesis (Combination)
  • A1 Magnesium combines with oxygen.

3
Mg O2 ? MgO
4
Magnesium (Mg)
5
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6
Mg reaction with oxygen
7
B. Decomposition
  • B1 Hydrogen Peroxide (H2O2) decomposes.

8
Hydrogen Peroxide
9
H2O2 ? H2 O2
  • This reaction occurs very slowly and so we use a
    catalyst to speed up the reaction.
  • Catalysts are chemicals.
  • MnO2 will be used as a catalyst in this reaction
  • Catalysts are written above the arrow in a
    chemical equation.

10
MnO2 Catalyst
11
Test for O2
  • Insert a glowing splint. If it relights then
    O2 is present.

12
Test for H2
  • Hydrogen will explode when exposed to a flame

13
B. Decomposition
  • B2 Copper(II) Carbonate decomposes when heated.

14
  • CuCO3 ? CuO CO2

15
Copper(II) Carbonate
16
Copper(II) Oxide
17
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18
Limewater Test for CO2
  • Lime water will turn cloudy when CO2 is bubbled
    through it.

19
Combustion
  • B3 Methane is burned
  • CH4 O2 ? CO2 H2O

20
CH4 O2 ? CO2 H2O
21
C. Single Replacement
  • C1 Zinc is added to Hydrochloric acid (HCl)

22
  • Zn HCl ? H2 ZnCl2

23
Zinc Hydrochloric Acid
24
Highly Exothermic
25
ZnCl2 is a clear solution however due to
impurities in the zinc it may appear as a grayish
solution with black specks.
26
Synthesis (Combination)
  • C2 Hydrogen and Oxygen Gas Combine
  • Test for Hydrogen (Explosion)

27
H2 O2 ? H2O
28
C. Single Replacement
  • C3 Aluminum metal is added to a solution of
    copper(II) chloride.

29
Al CuCl2(aq) ? Cu AlCl3(aq)
30
Aluminum CuCl2(aq)
31
Al CuCl2(aq) ? Cu AlCl3(aq)
32
D. Double Replacement
  • D1 Solutions of sodium iodide and lead(II)
    nitrate are mixed.

33
Precipitate Formation
  • NaI(aq) Pb(NO3)2(aq) ? NaNO3(aq) PbI2?

34
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35
PbI2 Precipitate
36
D. Double Replacement
  • D2 Solutions of silver nitrate and sodium
    chromate are mixed.

37
Precipitate Formation
  • AgNO3(aq) Na2CrO4(aq) ?
  • NaNO3(aq) Ag2CrO4?

38
(No Transcript)
39
Ag2CrO4 Precipitate
40
Homework
  • Lab Summary for the Chemical Reactions Lab due
    tomorrow.
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