14.2 Review

Pg. 973 #55,57,58,61

Pg. 928-937 #9-16

Vernier Lab: Volume and Pressure

Lab 1

% Yield Multiple Reactions

Pg. 819 #38,39

Pg. 817 #32,33

Pg. 816 #30,31

Pg. 813 #28,29

% Yield Lab

Purpose: Determine the % Yield of a single replacement reaction. 

1) Mass of 0.5 g Fe: .51g

2) Mass 2.5 g CuSO4*5H2O: 2.50g

3) Dissolve CuSO4*5H2O in 100 ml H2O: 1.51g

4) Heat to dissolve 15 min then add Fe

5) Do not boil

6) After 15 min decant into yogurt container

7) Rinse into pan and place in oven.

Data: 

Mass of Fe: .51g

Mass of Cu: .46g

Mass of CuSO4*5H2O: 2.50g 

Percent Yield of Reaction: 79.31%

Pg. 816 #45-46

Pg. 802 #23

Pg. 798 #15-16

Pg. 795 #13-14

Empirical Formula Lab

Purpose: To find the Empirical Formula for magnesium oxide. 

Procedure: 

1. Wash out the crucible and dry completely using a Bunsen burner.

2. Weigh the crucible. 

3. Crumple 2 inches of magnesium ribbon and place in crucible.

4. Weigh the crucible plus the ribbon

5. Heat magnesium in crucible until competely burned.

6. Cool.

7. Weigh crucible plus burned magnesium. 

Calculations:

Mass of Crucible- 19.5656g

Mass of Crucible with Magnesium- 19.7415g

Initial mass of Magnesium- .1759g

Mass of Magnesium- .1759g

Mass of Oxygen- 

Mole of Magnesium-7.33x10^-3 moles

Mole of Oxygen-

Ratio of Magnesium to Oxygen in moles- 

% Error = true-observed/ true * 100

Calculations:

.1759g(1mol/24g)= 0.00733 moles 

Pg. 793 #11-12