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Los Angeles Southwest College
Chemistry 051 โ Fundamental of Chemistry
Instructor: Prof. Rodriguez, SP2023
Name:
Date:
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Homework #7
You must show your entire work on a separate sheet(s) of paper to get full credit.
Chapters 7&10
1. a. What is organic chemistry?
b. What are hydrocarbons?
c. What is the system that names organic compounds in chemistry?
2. Which of the following are organic compounds?
a. NH3 b. C6H12O6 c. NaCl d. CH2Cl2
3. What is the IUPAC name for a,b,c and the common name of c?
a.
b.
c.
4. There are two isomers corresponding to the chemical formula C 2H6O. One is an
alcohol, and the other is an ether. (hint use the table of electronegativity)
a. Draw each compound.
b. Which compound would you expect to be more water soluble, and why?
c. Which compound would you expect to have the higher boiling point, and why?
5. Draw the structures of a three-carbon chain structure with following functional
groups.
a. An alcohol
b. A carboxylic acid
c. An aldehyde
d. An amine
6. Write the condensed structural formula for each of the following molecules:
a. ethylcyclopropane b. methylcyclohexane c. 1,3-dichloro-3-methylheptane
7. a.
Molarity Moles Vol(L)
0.0951
c.
0.424
Molarity Moles
0.273
b.
Molarity Moles
Vol(L)
0.545
Vol(L)
d.
1.03
Molarity Moles
2.98
Vol(L)
0.774
3.71
8. a. What is the molarity of a solution of calcium chloride which contains 33500 mg of
solute in a total volume of 0.352L?
b. What is the molarity of a solution of LiI which contains 26800 mg of solute in a
total volume of 0.282L?
c. What is the molarity of a solution of calcium chloride which contains 0.440moles
of solute in a total volume of 0.872L?
9. a. How many mL of solvent should be added to 0.99L of a 1.5M solution if you want
a final concentration of 0.74M?
b. 0.096L of a 2.9M solution is diluted to a final volume of 250mL. What is the
resultant molarity?
c. How many L of solvent should be added to 0.77L of a 1.0M solution if you want a
final concentration of 0.45M?
10. Indicate whether following reactions is a strong, weak, or nonelectrolyte represented
in the following equations:
a.
b.
c.
d.
K2SO4(s) (in H2O) โ 2K+(aq) + SO42-(aq)
NH4OH(aq) (in H2O) ๏ณ NH4+ (aq) + OH- (aq)
C6H12O6(s) (in H2O) โ C6H12O6(aq)
MgCl2(s) (in H2O) โ Mg2+(aq) + 2Cl-(aq)
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.4.hw 13 1.The diagram shows two aqueous solutions separated by a semi-permeable membrane. Which diagram illustrates what this system will look like after some time has passed? 2.Classify each statement as applying to osmosis, dialysis, or both osmosis and dialysis.Osmosis, Dialysis, Bothanswer bank ; involves the movement of small particles across a semipermeable membrane, may be used as a way to separate small molecules and ions from Colloids, involves the movement of water across a semipermeable membrane, can be used medically in artificial kidney machines to remove urea, involves the movement of water across a cell membrane3.Arrange the boiling points of the aqueous solutions, relative to pure water. 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Arrange the dye solutions from highest to lowest concentration.Highest concentration of dyeLowest concentration of dyeanswer bank ; 3.0 mL AND 3.0 mL water, 20uM Dye solution , 1.0 mL dye and 3.0 mL water , 4.0 mL dye and 0.0 mL water, 3.0 mL dye and 1.0 mL water15.Use the food dye interactive to perform each dilution and then determine the values of ๐ถf , ๐f , and ๐i .Food dyeInitial concentration (ฮผM)Initial volume (mL)Final concentration (ฮผM)Final volume (mL)Red 40322.0๐ถf4.0Yellow 5402.010๐fBlue 18.0๐i4.04.0๐ถf=ฮผM๐f=mL๐i=mL16.How many grams of solute are present in 885 mL of 0.540 M KBr?mass of solute:g17.If 6.99 g of CuNO3 is dissolved in water to make a 0.250 M solution, what is the volume of the solution in milliliters?volume:mL18.Calculate the number of moles of solute in 84.17 mL of 0.1585 M K2Cr2O7(aq).moles of solute:mol19.A solution of CaCl2 in water forms a mixture that is 28.5% calcium chloride by mass. If the total mass of the mixture is 838.1 g, what masses of CaCl2 and water were used?mass of CaCl2:gmass of water:gCalculate the molarity of the two solutions.The first solution contains 0.300 mol of NaOH in 2.10 L of solution.molarity:MThe second solution contains 14.9 g of NaCl in 639 mL of solution.molarity:M20.Calculate the mass percent of solute in each solution.Calculate the mass percent of 3.57 g KCl dissolved in 58.6 g H2O.mass percent:%Calculate the mass percent of 25.5 g KNO3 dissolved in 848 g H2O.mass percent:%21.Classify each of the events based on whether the solubility of the gas will increase, decrease, or stay the same.Gas solubility increases,Gas solubility decreases,Gas solubility does not changeAnswer bank : the temperature is decreased, O2 as the temperature of a body of water rises, air in the blood as a diver descends 10 m, and the pressure increases by 1 atm , the pressure of a gas over a solvent is decreased, the partial pressure of an anesthetic gas is increased 22. 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If the total mass of the mixture is 838.1 g, what masses of CaCl2 and water were used?mass of CaCl2:gmass of water:gCalculate the molarity of the two solutions.The first solution contains 0.300 mol of NaOH in 2.10 L of solution.molarity:MThe second solution contains 14.9 g of NaCl in 639 mL of solution.molarity:M20.Calculate the mass percent of solute in each solution.Calculate the mass percent of 3.57 g KCl dissolved in 58.6 g H2O.mass percent:%Calculate the mass percent of 25.5 g KNO3 dissolved in 848 g H2O.mass percent:%21.Classify each of the events based on whether the solubility of the gas will increase, decrease, or stay the same.Gas solubility increases,Gas solubility decreases,Gas solubility does not changeAnswer bank : the temperature is decreased, O2 as the temperature of a body of water rises, air in the blood as a diver descends 10 m, and the pressure increases by 1 atm , the pressure of a gas over a solvent is decreased, the partial pressure of an anesthetic gas is increased 22. 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