Chemistry 104
Test #2D
October 13, 2009
Please follow these instructions
1. There is only 1 correct answer for Multiple-choice questions (choose
the best answer)
2. Please remember that only the answer sheets will be graded so
record all your answers on the answer-sheet
3. Use the periodic table attached
4. Constants and formulas:
R = 0.0821 atm.L/mol.K
October 13, 2009
Test 2
Chemistry 104
Student’s Name:
Answers
Formula if any used
Answers
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Formula if any used
Test # 2D
Dr Pierre Goueth
Chemistry 104
Student’s Name:
Fall 2009
Multiple Choice Questions (2 pts each)
1.
How much energy would be released as the temperature of 150 grams of copper (specific heat =
0.0924 cal/g°C) drops from 79.0°C to 50.0°C?
A. 3 cal
B. 402 cal
C. 3650 cal
D. 3950 cal
2.
A hurricane might be preceded by an atmospheric pressure of 727 torr. Express 727 torr in atm of
pressure.
A. 0.727 atm
B. 0.96 atm
C. 1,05 atm
D. 49.5 atm
3.
Standard temperature and pressure, STP is _____.
A. 0°C and 1 atm
B. 25°C and 1 atm
4.
A cylinder of gas originally at 28.0°C and 1.00 atm of pressure to is heated to 112.0°C. What is the
new pressure?
A. 4.00 atm
B. 0.250 atm
C. 0.782 atm
D. 1.28 atm
5.
A balloon containing 0.56 mole of helium has a volume of 10.0 L. What volume will the balloon
occupy if helium is lost and only 0.21 mole remain?
A. 27 L
B. 3.8 L
C. 2.1 L
D. 5.6 L
6.
A pressurized tank contains nitrogen at 1.3 atm, oxygen at 0.7 atm, and helium at 0.1 atm. The
reading of the pressure gauge is expected to be _____.
A. 0.5 atm
B. 0.91 atm
C. 1.3 atm
D. 2.1 atm
7.
What is the volume of a mole of an ideal gas under standard conditions (STP)?
A. 0.0821 liter
B. 760 liters
C. 22.4 liters
D. 1.0 liter
8.
A balloon with a volume of 4.5 L at a temperature of 23.0oC is taken outside where the temperature is
2.0oC. What is the new volume of the balloon?
A. 0.39 L
B. 52 L
C. 4.8 L
D. 4.2 L
9.
The viscosity of a liquid is the measure of _____.
A. its internal pressure
B. the size of the molecules present
C. its chemical composition
D. its resistance to flow
10. The viscosity of liquids is most affected by _____.
A. pressure
B. volume
C. 37°C and 1.01 atm
C. temperature
D. 100°C and 2 atm
D. none of the above
21. According to the octet rule, how many valence electrons are present in a chloride ion (Cl-)?
A. 1
B. 2
C. 4
D. 8
12. Which two ions are isoelectronic (same number of electrons)?
A. K+ and ClB. Mg2+ and Be2+
C. Be2+ and O2-
D. Li+ and I-
13. Generally, the octet rule works fairly well for predicting the behavior of atoms. However, there is an
exception.
A. The halogens do not form ions on the basis of the octet rule.
B. The alkali metals only conform to the octet rule when producing neutral atoms.
C. The transition metals do not necessarily conform to the octet rule.
D. The nonmetals do not conform to the octet rule.
14. The formula for ammonium chloride is
A. AlCl3
B. NH4Cl
C. NCl
D. AmCl
15. The difference between an ionic bond and a covalent bond is that
A. ionic bonds commonly occur between two metals and covalent bonds occur between metals and
nonmetals
B. ionic bonds are between atoms that can share electrons; covalent bonds are between atoms that
will donate/accept electrons
C. covalent bonds come about because of a sharing of electrons; ionic bonds don’t
D. ionic bonds are between smaller atoms; covalent bonds are between large atoms
16. What is the proper name of the compound N2O3?
A. nitrate
B. nitrogen(II) oxide
C. nitrogen trioxide
D. dinitrogen trioxide
17. Aluminum sulfate, Al2(SO4)3, can be used as an anti-infective. What is the formula weight of this salt?
A. 75.1 amu
B. 150.1 amu
C. 315.3 amu
D. 342.3 amu
18. Glycerol, often called glycerine, was used as a skin moisturizer before more commercial preparations
were made available. Calculate the weight of 7.85 moles glycerin.
A.
B.
C.
D.
92.3 grams
228 grams
667 grams
722 grams
H
H
O
H
O
H
C
C
C
H
H
H
O
H
19. The specific gravity of a substance is the
A. definite affect of gravity on that substance.
B. comparison of the density of the substance with that of water.
C. the mass of the substance squared divided by its volume.
D. the inverse of the density of the substance.
20. Which molecule can exist as cis and trans isomers?
A. 1,2-dimethyl cyclopentane
B. cyclopentane
C. 1,1-dimethylcyclopentane
D. methyl cyclopentane
21.
Which compound can exist as cis and trans isomers?
A. 2-methyl butane
B. 2,3-dimethyl pentane
C. 1-butene
D. 2-butene
22. Shown at the right is the structure of butyric acid.
Which choice below is the skeletal structure for butyric acid?
A.
B.
O
C
C
C
C
O
COOH
H
H
H
H
H
O
C
C
C
C
H
H
H
O
H
O
C.
D.
OH
23. 1,1-dimethyl cyclopentane and 1,2-dimethyl cyclopentane are _____.
A. different conformations of the same compound
B. constitutional isomers
C. geometric isomers
D. the same
24. On the basis of the electronegativities provided, which bond is most likely to be ionic?
A. calcium(1.0) and carbon (2.5).
B. potassium (0.8) and bromine (2.8).
C. sulfur (2.5) and oxygen (3.5).
D. magnesium (1.2) and phosphorous (2.1).
25. The strongest noncovalent interaction that can occur between hydrocarbons is _____.
A. dipole-dipole forces B. hydrogen bonding
C. ion-dipole interaction D. London force
26. Cis-2-pentene and trans-2-pentene are _____.
A. different conformations of the same compound
B. constitutional isomers
C. geometric isomers
D. the same
27. Which of the following molecules has the highest boiling point?
A. propanol
B. propane
C. propene
D. propyne
28. Chose the incorrect statement describing the alkane family. The alkanes
A. are nonpolar molecules.
B. are all composed of unbranched chains of carbons (straight chains).
C. boil at a higher temperature with increasing length of the carbon chain.
D. with short carbon chains (1 to 4 carbons) tend to be gases at room temperature.
29. According to Charles' law when the Kelvin temperature of a gas doubles (at constant pressure), its
volume will _____.
A. double
B. reduced to ½
C. quadruple
D. remain the same
30. Which is the correct name for this hydrocarbon?
A.
B.
C.
D.
3-methylheptane.
2-ethylhexane.
butylethylethane.
butylethylmethylmethane.
31. Suppose you want to decrease the density of a sample of liquid mercury at room temperature. Which
of the following would accomplish that purpose?
A. Decrease the pressure by 5 torr.
B. Decrease the temperature by 5 degrees.
C. Increase the pressure by 5 torr.
D. Increase the temperature by 5 degrees.
32. Naming cyclic compounds is similar to naming straight chain compounds. This compound is
A.
B.
C.
D.
1,1,2-trimethylcyclohexane.
1,2,2,-metholatedhexanecyclic
trimethylcyclohexane.
2,2-dimethylcyclonone.
33. Name the compound drawn here.
A. isopropylethylethyne
B. 1,1-dimethyl-2-pentyne
C. 1-isopropyl-1-butyne
D. 2-methyl-3-hexyne
CH 3
CH
H 2C
H 2C
CH3
C
CH 2
CH 3
CH2
H
H
H
H
C
C
H
H
H
C
C
C
H
H
C
C
H
H
H
34. What is the major component that identifies an aromatic compound?
A. There will be parent chains containing more than one cyclic functional group.
B. Aromatic compounds always contain a long parent chain and a cyclic portion.
C. There are rings of carbons chemically bonded by alternating single and double bonds.
D. The longer the parent chain, the more likely the compound is to have a scent.
35. Which of the following defines "heat of fusion"?
A. The amount of heat energy necessary to raise the temperature of 1.00 gram of a substance 1.00oC.
B. The amount of heat energy necessary to raise the temperature of 1.00 gram of water 1.00oC.
C. The heat absorbed or released when a substance melts or freezes.
D. The heat absorbed or released when a substance vaporizes or condenses.
36. A 5.00 mL sample of octane, one of the liquids found in gasoline, has a mass weighing 3.55 grams.
What is the density of octane?
A. 0.71 g/mL
B. 1.41 g/mL
C. 8.55 g/mL
D. 17.75 g/mL
37. A gas cylinder at a pressure of 5.80 atm contains both helium and oxygen. The helium is at a
pressure of 2.35 atm. What is partial pressure of oxygen?
A. 2.35 atm
B. 3.45 atm
C. 5.80 atm
D. 8.15 atm
38. What is the specific gravity of a urine sample with a volume of 50.85 mL and a mass of 51.26 g?
A. 0.9920
B. 1.008
C. 50.85
D. 1.100
39. In Death Valley which is located below sea level, the atmospheric pressure exceeds 760 torr. Water
boils at
A. less than 100ºC
B. 100ºC
C. more than 100ºC
D. will never boil
40. The number of calories required to raise the temperature of 75 grams of water from 23.0°C to 31.0°C
is _____.(Specific heat capacity of water is 1 cal/g 0C)
A. 1725 cal
B. 713 cal
C. 600 cal
D. 248 cal
Short Answers
Show all necessary calculations. Include all necessary units. Round answers to the correct
number of significant figures. Box final answers.
1. How many moles of helium are present in a 5.00 L cylinder at a pressure of 3.85 atm and a
temperature of 24.0 ºC? (3 pts)
2. How much heat energy is necessary to convert 95.0 g of ice at 0 ºC to liquid water at 0 ºC? (heat of
fusion of water is 79.7 cal/g) (3 pts)
3. Draw the structures of the following: (4 pts)
2-pentyne
meta-diethylbenzene
4. Sketch the structural formula for each of the following. Determine the molecular geometry and
molecular polarity and the formal charge of each of the atom present. (6pts)
Formula
CSe2
Lewis Structure
Formal charge
of each atom
C:
Se:
NO2-
N:
O:
O:
NF3
N:
F:
Molecular
Geometry
Molecular
Polarity