KSU CHEM 1212 Final Exam study
guide solution Kennesaw State
University
what is the density of a solid that weighs 4.55g and occupies a volume of 3.78 mL? -
answer- 1.20 g/mL
What is the density of a solid that weighs 3.78 g and occupies a volume of 4.55 mL? -
answer- 0.831 g/mL
When ethanol(ℓ) is added to water, it results in one solution.
What describes the relationship between ethanol and water? - answer- Miscible
Adding water(ℓ) to diesel fuel (ℓ) results in two layers.
What describes the relationship between diesel fuel and water? - answer- immiscible
Which property is an example of a chemical property? - answer- A solid absorbs water
from the air to liquefy
Identify the reaction type for the generic reaction given.
A + B → A+n + B-m - answer- Oxidation-Reduction
Identify the reaction type for the generic reaction given.
AC + B → A + BC - answer- Single Displacement
What should you do if some of the H2O2-H2SO4 solution comes into contact with your
skin? - answer- Wash the skin for 15 minutes with water and notify the TA
In this reaction, you observed several different Cu species which had different physical
attributes. Select the appropriate chemical formula(s) that corresponds to a turquoise
(blue-green) solid. - answer- Cu(OH)2
In this reaction, you observed several different Cu species which had different physical
attributes. Select the appropriate chemical formula(s) that corresponds to a red-brown
solid. - answer- Cu
This set of reactions is called a copper cycle, since you started and ended with Cu.
Which statement(s) is/are true concerning these reactions?
1. The mass of CuO should equal the mass of Cu (from Part I).
2. The moles of CuSO4 should equal the moles of Cu(OH)2.
, 3. The moles of Cu(OH)2 should equal the moles of CuO.
4. The mass of Cu produced in Part V should equal the mass of Cu used in Part I. -
answer- 2, 3, and 4 are correct
Cooper and Zach did this experiment dissolving 3.10 g of Cu(C2H3O2)2·H2O and
adding 6.93 g NaC7H4SO3N·H2O. They recovered 6.82 g of product. In their
calculations, they found that 8.32 g of product should be produced. The ratio of (6.32
g/8.32 g) x 100% is equal to 82.0%.
Which label applies to 6.82 ? - answer- actual yield
Cooper and Zach used 2.65 g of Cu(C2H3O2)2·H2O and excess sodium saccharinate
and recovered 4.35 g of Cu(C7H4SO3N)2(H2O)4·2 H2O. What is the percent yield? -
answer- 61.2%
What is the mole to mole ratio between Cu(C2H3O2)2·H2O and NaC7H4SO3N·H2O? -
answer- 1 mol Cu(C2H3O2)2*H2O : 2 mol NaC7H4SO3*H20
Cooper, Zach and Nate did this experiment dissolving 3.50 g of Cu(C2H3O2)2·H2O and
adding 7.90 g NaC7H4SO3N·H2O. What is the theoretical yield? - answer- 9.39 g
For the procedural error, indicate if the error will affect the actual yield of copper(II)
saccharinate product and if it does, will it raise or lower the actual yield:
Leaving some crystals behind in the beaker - answer- lowers the actual yield
For the procedural error, indicate if the error will affect the actual yield of copper(II)
saccharinate product and if it does, will it raise or lower the actual yield:
Scraping the filter paper so hard that small bits of filter paper are with the crystals on the
watch glass - answer- raises the actual yield
Zach and Nate did this experiment dissolving 2.85 g of Cu(C2H3O2)2 · H2O and adding
6.77 g of NaC7H4SO3N·H2O. They recovered 6.17 g of product.
What is the percent yield (%) ? - answer- 80.7
Zach and Nate did this experiment dissolving 4.18 g of Cu(C2H3O2)2 · H2O and adding
9.78 g of NaC7H4SO3N·H2O. They recovered 10.84 g of product.
What is the theoretical yield in grams ? - answer- 11.21
Zach and Nate did this experiment dissolving 2.25 g of Cu(C2H3O2)2 · H2O and adding
5.13 g of NaC7H4SO3N·H2O. They recovered 5.18 g of product.
What is the percent yield (%) ? - answer- 85.8
Which statement best explains what happens to the percent yield if the crystals
(product) were washed with hot water? - answer- The actual yield will decrease since
part of the product will dissolve and not be recovered as a solid. Since actual yield is in
the numerator, the percent yield will also decrease.
guide solution Kennesaw State
University
what is the density of a solid that weighs 4.55g and occupies a volume of 3.78 mL? -
answer- 1.20 g/mL
What is the density of a solid that weighs 3.78 g and occupies a volume of 4.55 mL? -
answer- 0.831 g/mL
When ethanol(ℓ) is added to water, it results in one solution.
What describes the relationship between ethanol and water? - answer- Miscible
Adding water(ℓ) to diesel fuel (ℓ) results in two layers.
What describes the relationship between diesel fuel and water? - answer- immiscible
Which property is an example of a chemical property? - answer- A solid absorbs water
from the air to liquefy
Identify the reaction type for the generic reaction given.
A + B → A+n + B-m - answer- Oxidation-Reduction
Identify the reaction type for the generic reaction given.
AC + B → A + BC - answer- Single Displacement
What should you do if some of the H2O2-H2SO4 solution comes into contact with your
skin? - answer- Wash the skin for 15 minutes with water and notify the TA
In this reaction, you observed several different Cu species which had different physical
attributes. Select the appropriate chemical formula(s) that corresponds to a turquoise
(blue-green) solid. - answer- Cu(OH)2
In this reaction, you observed several different Cu species which had different physical
attributes. Select the appropriate chemical formula(s) that corresponds to a red-brown
solid. - answer- Cu
This set of reactions is called a copper cycle, since you started and ended with Cu.
Which statement(s) is/are true concerning these reactions?
1. The mass of CuO should equal the mass of Cu (from Part I).
2. The moles of CuSO4 should equal the moles of Cu(OH)2.
, 3. The moles of Cu(OH)2 should equal the moles of CuO.
4. The mass of Cu produced in Part V should equal the mass of Cu used in Part I. -
answer- 2, 3, and 4 are correct
Cooper and Zach did this experiment dissolving 3.10 g of Cu(C2H3O2)2·H2O and
adding 6.93 g NaC7H4SO3N·H2O. They recovered 6.82 g of product. In their
calculations, they found that 8.32 g of product should be produced. The ratio of (6.32
g/8.32 g) x 100% is equal to 82.0%.
Which label applies to 6.82 ? - answer- actual yield
Cooper and Zach used 2.65 g of Cu(C2H3O2)2·H2O and excess sodium saccharinate
and recovered 4.35 g of Cu(C7H4SO3N)2(H2O)4·2 H2O. What is the percent yield? -
answer- 61.2%
What is the mole to mole ratio between Cu(C2H3O2)2·H2O and NaC7H4SO3N·H2O? -
answer- 1 mol Cu(C2H3O2)2*H2O : 2 mol NaC7H4SO3*H20
Cooper, Zach and Nate did this experiment dissolving 3.50 g of Cu(C2H3O2)2·H2O and
adding 7.90 g NaC7H4SO3N·H2O. What is the theoretical yield? - answer- 9.39 g
For the procedural error, indicate if the error will affect the actual yield of copper(II)
saccharinate product and if it does, will it raise or lower the actual yield:
Leaving some crystals behind in the beaker - answer- lowers the actual yield
For the procedural error, indicate if the error will affect the actual yield of copper(II)
saccharinate product and if it does, will it raise or lower the actual yield:
Scraping the filter paper so hard that small bits of filter paper are with the crystals on the
watch glass - answer- raises the actual yield
Zach and Nate did this experiment dissolving 2.85 g of Cu(C2H3O2)2 · H2O and adding
6.77 g of NaC7H4SO3N·H2O. They recovered 6.17 g of product.
What is the percent yield (%) ? - answer- 80.7
Zach and Nate did this experiment dissolving 4.18 g of Cu(C2H3O2)2 · H2O and adding
9.78 g of NaC7H4SO3N·H2O. They recovered 10.84 g of product.
What is the theoretical yield in grams ? - answer- 11.21
Zach and Nate did this experiment dissolving 2.25 g of Cu(C2H3O2)2 · H2O and adding
5.13 g of NaC7H4SO3N·H2O. They recovered 5.18 g of product.
What is the percent yield (%) ? - answer- 85.8
Which statement best explains what happens to the percent yield if the crystals
(product) were washed with hot water? - answer- The actual yield will decrease since
part of the product will dissolve and not be recovered as a solid. Since actual yield is in
the numerator, the percent yield will also decrease.
