SJCC_Chem15_Sp07_LecTest3

Multiple Choice
Identify the choice that best completes the statement or answers the question.

____	1.	What is the trend in electronegativities among the main group elements in the periodic table?
a.	Decrease left to right; decrease top to bottom	
b.	Increase left to right; decrease top to bottom	
c.	Increase left to right; increase top to bottom	
d.	Decrease left to right; increase top to bottom	
e.	There is no periodic trend for electronegativities	

____	2.	10.7 L of a gas at 1.75 atm are expanded to 20.0 L at a constant temperature. What is the new gas pressure?
a.	375 atm	
b.	1.07 atm	
c.	0.936 atm	
d.	0.0306 atm	
e.	3.27 atm	

____	3.	With all other factors being equal, which of the following correctly lists intermolecular forces in order of increasing strength?
a.	Induced dipole forces < Dipole forces < Hydrogen bonds	
b.	Induced dipole forces < Hydrogen bonds < Dipole forces	
c.	Dipole forces < Hydrogen bonds < Induced dipole forces	
d.	Hydrogen bonds < Dipole forces < Induced dipole forces	
e.	Dipole forces < Induced dipole forces < Hydrogen bonds	

____	4.	The specific heat of gold is 0.13 J/g • °C. How much heat is needed to raise the temperature of 25.0 g of gold from 23°C to its melting point at 1063°C?
a.	2.0 ´ 103 kJ	
b.	0.14 kJ	
c.	3.3 kJ	
d.	3.5 kJ	
e.	3.4 kJ	

____	5.	27.7 L of a gas is cooled at constant pressure from 87°C to 24°C. What will the volume be at the lower temperature?
a.	22.9 L	
b.	7.64 L	
c.	33.6 L	
d.	1.00 ´ 102 L	
e.	0.0438 L	

____	6.	What is a lone pair in a Lewis diagram?
a.	An unshared pair of electrons	
b.	The electrons that are not counted when determining if the octet of an atom has been satisfied	
c.	A shared pair of electrons	
d.	A bonding pair of electrons	
e.	A molecule with only two electrons	

____	7.	Calculate the number of moles in 3.13 L of nitrous oxide at STP.
a.	0.140 mol	
b.	138 mol	
c.	70.1 mol	
d.	7.16 mol	
e.	93.9 mol	

____	8.	A negatively charged ion is called...
a.	a negatron	
b.	an anion	
c.	a valence ion	
d.	isoelectronic	
e.	a cation	

____	9.	In a covalent bond, the valence electrons from atoms are...
a.	shared	
b.	gained by the anion	
c.	transferred to the less metallic element	
d.	gained by the cation	
e.	transferred to the more metallic element	

____	10.	What is the electron pair geometry surrounding the boron atom in BH3?
a.	Tetrahedral	
b.	Trigonal pyramid	
c.	Linear	
d.	Angular (Bent)	
e.	Trigonal planar	

____	11.	What is the molar mass of a gas if 1.070 g of the gas occupies 264 mL at 100°C and 768 torr?
a.	64.0 g/mol	
b.	0.162 g/mol	
c.	123 g/mol	
d.	0.123 g/mol	
e.	32.9 g/mol	

____	12.	Which element will act as the negative pole in each of the following bonds: Li–H, H–C?

Element	Electronegativity	
Li	1.0	
H	2.1	
C	2.5	

a.	Li in Li–H and C in H–C	
b.	H in Li–H and C in H–C	
c.	Li in Li–H and H in H–C	
d.	H in Li–H and H in H–C	
e.	The bonds in H–C are not polar and cannot be classified as having a negative pole.	

____	13.	Which of the following is the best Lewis diagram for NO2-?
a.		d.		
b.		e.		
c.		

____	14.	How many grams of oxygen gas occupy 549 mL at 743 torr and 18°C?
a.	11.6 g	
b.	0.0225 g	
c.	0.751 g	
d.	0.359 g	
e.	0.718 g	

____	15.	What is the electron pair geometry surrounding the oxygen atom in water?
a.	Tetrahedral	
b.	Angular (Bent)	
c.	Linear	
d.	Trigonal pyramid	
e.	Trigonal planar	

____	16.	What is the equivalent of 684 torr in mm Hg?
a.	0.900 mm Hg	
b.	1444 mm Hg	
c.	684 mm Hg	
d.	6.75 mm Hg	
e.	46.6 mm Hg	

____	17.	A balloon is filled with a gas and has a volume of 1.79 L at 2.82 atm pressure. What will its volume be if the pressure is changed to 5.30 atm?
a.	26.8 L	
b.	3.36 L	
c.	0.297 L	
d.	0.952 L	
e.	1.05 L	

____	18.	Argon fills an 8.40-liter container at 9.20 ´ 103 torr and 18°C. How many moles of argon are in the container?
a.	5.23 ´ 103 mol	
b.	6.88 mol	
c.	4.26 mol	
d.	2.35 mol	
e.	323 mol	

____	19.	What is the molar volume of CO2 at 39°C and 652 torr?
a.	3.73 L/mol	
b.	1.32 ´ 103 L/mol	
c.	29.9 L/mol	
d.	0.0393 L/mol	
e.	0.0335 L/mol	

____	20.	What is the temperature of 0.0250 mole of hydrogen gas if it occupies 665 mL at 715 torr?
a.	100°C	
b.	-273°C	
c.	13°C	
d.	32°C	
e.	305°C	

____	21.	What is the partial pressure of hydrogen gas collected over water if the total pressure is 0.990 atm and the partial pressure of water vapor is 0.034 atm?
a.	0.956 atm	
b.	29.1 atm	
c.	0.990 atm	
d.	1.024 atm	
e.	0.034 atm	

____	22.	A gas occupies 4.71 liters at 62°C and 795 torr. What volume will it occupy if it is cooled to 17°C and compressed to 911 torr?
a.	4.67 L	
b.	4.75 L	
c.	6.23 L	
d.	1.13 L	
e.	3.56 L	

____	23.	If substance X has stronger intermolecular attractions than substance Y, which of the following is most apt to be false?
a.	X has the lower vapor pressure and higher molar heat of vaporization	
b.	Y has the higher vapor pressure and lower molar heat of vaporization	
c.	X has the higher boiling point and higher molar heat of vaporization	
d.	Y has the higher boiling point and higher molar heat of vaporization	
e.	Y has the lower boiling point and higher vapor pressure	

____	24.	Which bond is completely nonpolar?
a.	C–H	
b.	C–N	
c.	H–O	
d.	H–F	
e.	F–F	

____	25.	Which of the following statements is true?
a.	The movement of a given ideal gas molecule is influenced only by the molecules in the immediate vicinity of that molecule	
b.	The attractive forces among ideal gas molecules are known as kinetic molecular forces	
c.	Ideal gas molecules behave as independent particles	
d.	The attractive forces among ideal gas molecules are short-range forces	
e.	The attractive forces among ideal gas molecules primarily depend upon the size of the particles	

____	26.	The STP volume of an ideal gas is 2.06 m3. Calculate the volume of the sample at 1.75 atm and 27°C.
a.	1.07 m3	
b.	3.28 m3	
c.	3.96 m3	
d.	0.773 m3	
e.	1.29 m3	

____	27.	How does the volume of 3 ´ 1022 hydrogen molecules compare with the volume of 3 ´ 1022 helium atoms, when both are measured at the same temperature and pressure?
a.	Both volumes are the same	
b.	The volume of hydrogen is twice the volume of helium	
c.	The volume of helium is four times the volume of hydrogen	
d.	The volume of helium is twice the volume of hydrogen	
e.	The volume of hydrogen is four times the volume of helium	

____	28.	Which of the following molecules is/are nonpolar?

i.	NH3	
ii.	H2O	
iii.	HCl	
iv.	CH4	
v.	CH2Cl2	

a.	i, ii, and iii	
b.	i, ii, iii, iv, and v	
c.	iv and v	
d.	iv only	
e.	i only	

____	29.	Which of the following statements is true?
a.	The distances between ideal gas molecules are usually about the same as the diameter of the molecules	
b.	The actual volume of ideal gas molecules is negligible compared to the space they occupy	
c.	Ideal gas molecules usually touch one another in a small container with low pressure and high temperature	
d.	Given that there is no chemical reaction between two gases, the ability to mix the gases in a rigid container of fixed volume depends on the external atmospheric pressure	
e.	In an ideal gas, the volume of the molecules is typically as low as 10% of the total container volume	

____	30.	Which of the following is the electron pair angle in CCl4?
a.	180°	
b.	107.5°	
c.	104.5°	
d.	120°	
e.	109.5°	

____	31.	Given the following electronegativities: H = 2.1, F = 4.0, C = 2.5, Cl = 3.0, arrange the bonds according to increasing polarity.
a.	H–F < C–Cl < H–Cl < H–C	
b.	H–F < H–Cl < C–Cl < H–C	
c.	H–Cl < H–C < H–F < C–Cl	
d.	H–C < C–Cl < H–Cl < H–F	
e.	H–C < H–Cl < H–F < C–Cl	

____	32.	Which of the following is the best Lewis diagram for PCl3?
a.		d.		
b.		e.		
c.		

____	33.	DHvap = 2.26 kJ/g for water. Calculate the amount of heat required to vaporize 100.0 g of water.
a.	40.7 kJ	
b.	733 kJ	
c.	44.2 kJ	
d.	226 kJ	
e.	4.07 ´ 103 kJ	

____	34.	How many single, double, and triple bonds are in the following molecule?

	# single bonds	# double bonds	# triple bonds	

a.	8                                   1                                   1	
b.	9                                   1                                   1	
c.	7                                   1                                   1	
d.	10                                 1                                   0	
e.	5                                   1                                   1	

____	35.	Which of the following has a trigonal pyramid molecular geometry?
a.	Cl2O	
b.	BH3	
c.	CF4	
d.	BeF2	
e.	NH3	

SJCC_Chem15_Sp07_LecTest3
Answer Section

MULTIPLE CHOICE

	1.	ANS:	B	PTS:	1

	2.	ANS:	C	PTS:	1

	3.	ANS:	A	PTS:	1

	4.	ANS:	E	PTS:	1

	5.	ANS:	A	PTS:	1

	6.	ANS:	A	PTS:	1

	7.	ANS:	A	PTS:	1

	8.	ANS:	B	PTS:	1

	9.	ANS:	A	PTS:	1

	10.	ANS:	E	PTS:	1

	11.	ANS:	C	PTS:	1

	12.	ANS:	B	PTS:	1

	13.	ANS:	B	PTS:	1

	14.	ANS:	E	PTS:	1

	15.	ANS:	A	PTS:	1

	16.	ANS:	C	PTS:	1

	17.	ANS:	D	PTS:	1

	18.	ANS:	C	PTS:	1

	19.	ANS:	C	PTS:	1

	20.	ANS:	D	PTS:	1

	21.	ANS:	A	PTS:	1

	22.	ANS:	E	PTS:	1

	23.	ANS:	D	PTS:	1

	24.	ANS:	E	PTS:	1

	25.	ANS:	C	PTS:	1

	26.	ANS:	E	PTS:	1

	27.	ANS:	A	PTS:	1

	28.	ANS:	D	PTS:	1

	29.	ANS:	B	PTS:	1

	30.	ANS:	E	PTS:	1

	31.	ANS:	D	PTS:	1

	32.	ANS:	B	PTS:	1

	33.	ANS:	D	PTS:	1

	34.	ANS:	C	PTS:	1

	35.	ANS:	E	PTS:	1