Prince George Community College » Chemistry » Chem 1010 - General Chemistry 1 » Summer 2021

Chem 1010 - General Chemistry 1 » Summer 2021 » Final Exam (A)

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Question #1

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is the molar mass of the unknown compound?

A. 38.0 g/mol

B. 33.9 g/mol

C. 12.2 g/mol

D. 81.8 g/mol

E. 26.3 g/mol

Question #2

What volume will 4.91 x 10 22 atoms of Ne occupy at STP?

A. 2.00 L

B. 1.10 L

C. 1.83 L

D. 3.11 L

E. 2.24 L

Question #3

A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO 3 in a coffee cup calorimeter. If both solutions were initially at 35.00°C and the temperature of the resulting solution was recorded as 37.00°C, determine the ΔH° rxn (in units of kJ/mol NaOH) for the neutralization reaction between aqueous NaOH and HCl. Assume 1) that no heat is lost to the calorimeter or the surroundings, and 2) that the density and the heat capacity of the resulting solution are the same as water.

A. -55.7 kJ/mol NaOH

B. -27.9 kJ/mol NaOH

C. -169 kJ/mol NaOH

D. - 34.4 kJ/mol NaOH

E. -16.7 kJ/mol NaOH

Question #4

Choose the reaction that illustrates ΔH° f for NaHCO 3.

A. Na+(aq) + HCO3 -1 (aq) → NaHCO3 (s)

B. Na(s) + 1/2 H2(g) + C(s) + 3/2 O2(g) → NaHCO3 (s)

C. Na(s) + 2 H(g) + C(s) + 3 O(g) → NaHCO3 (s)

D. Na(s) + H2(g) + C(s) + O2(g) → NaHCO3 (s)

E. Na+(aq) + H2O (l) + CO2 (g) → NaHCO3 (s)

Question #5

Which of the following processes is endothermic?

A. the chemical reaction in a "hot pack" often used to treat sore muscles

B. the freezing of water

C. a hot cup of coffee (system) cools on a countertop

D. the combustion of propane

E. the vaporization of rubbing alcohol

Question #6

How many atoms are in 2.50 moles of CO 2?

A. 1.52 x 1024 atoms

B. 3.01 x 1024 atoms

C. 4.52 x 1024 atoms

D. 5.02 x 1023 atoms

E. 7.53 x 1023 atoms

Question #7

Which of the following statements about subatomic particles is TRUE?

A. Protons and neutrons have opposite, but equal in magnitude, charges.

B. Electrons make up most of the mass of an atom.

C. Neutrons and electrons are found in the nucleus of an atom.

D. A neutral atom contains the same number of protons and electrons.

E. Protons have about the same mass as electrons.

Question #8

Determine the vapor pressure (in torr) of a substance at 36°C, whose normal boiling point is 84°C and has a ΔH vap of 22.1 kJ/mol.

A. 239 torr

B. 41.8 torr

C. 31.8 torr

D. 98 torr

E. 147 torr

Question #9

Why is water an extraordinary substance?

A. Water has an exceptionally high specific heat capacity.

B. Water has a low molar mass, yet it is a liquid at room temperature.

C. Water is the main solvent within living organisms, it has strong hydrogen bonding, it has an exceptionally high specific heat capacity, and It has a low molar mass, yet it is a liquid at room temperature.

D. Water has strong hydrogen bonding.

E. Water is the main solvent within living organisms.

Question #10

Which of the following is a Br ℯnsted-Lowry acid?

A. Br2

B. NH4+

C. CH4

D. NH3

E. NH2-

Question #11

Which of the following is TRUE?

A. A neutral solution contains [H2O] = [H3O

B. An acidic solution has [H3O] > [OH]

C. An neutral solution does not contain any H3O+ or OH-

D. A basic solution does not contain H3O+

E. None of the above are true.

Question #12

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution?

A. 0.356 M

B. 0.274 M

C. 3.65 M

D. 2.81 M

Question #13

According to the balanced equation shown below, 4.00 moles of oxalic acid, H 2C 2O 4, reacts with __________ moles of permanganate, MnO 4 -. 5 H 2C 2O 4( aq) + 2 MnO 4 -( aq) + 6 H +( aq) → 10 CO 2( g) + Mn 2+( aq) + 8 H 2O( l)

A. 1.6

B. 9

C. 8

D. 4

Question #14

In an acid-base neutralization reaction 38.74 mL of 0.500 M potassium hydroxide reacts with 50.00 mL of sulfuric acid solution. What is the concentration of the H 2SO 4 solution?

A. 1.29 M

B. 0.387 M

C. 0.775 M

D. 0.194 M

Question #15

An alligator is 152.4 cm long. How long is he in feet?

A. 60.0 ft

B. 32.2 ft

C. 720.0 ft

D. 12.7 ft

E. 5.00 feet

Question #16

If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3 ft = 1 yd)

A. 24 gallons

B. 7.1 gallons

C. 21 gallons

D. 2.3 gallons

E. 47 gallons

Question #17

The element that corresponds to the electron configuration 1s 22s 22p 63s 23p 64s 13d 5 is ________.

A. iron

B. chromium

C. titanium

D. manganese

E. vanadium

Question #18

In which orbital below would an electron (on average) be farthest from the nucleus?

A. 3d

B. 1s

C. 2p

D. 3s

E. 4f

Question #19

Which of the following elements can form compounds with an expanded octet?

A. Be

B. Br

C. F

D. O

E. None of the above can form compounds with an expanded octet.

Question #20

Choose the bond below that is most polar.

A. N-O

B. C-F

C. Cl-Cl

D. C-N

E. C-C

Question #21

A solution is formed at room temperature by vigorously dissolving enough of the solid solute so that some solid remains at the bottom of the solution. Which statement below is TRUE?

A. The solution is considered unsaturated.

B. The solution is considered saturated.

C. The solution is considered supersaturated.

D. The solution would be considered unsaturated if it were cooled a bit to increase the solubility of the solid.

E. None of the above are true.

Question #22

To make a 0.500 M solution, one could take 0.500 moles of solute and add

A. 1.00 L of solvent.

B. enough solvent to make 1.00 kg of solution.

C. enough solvent to make 1.00 L of solution.

D. 1.00 kg of solvent.

Question #23

A solution is prepared by dissolving 7.00 g of glycerin (C 3H 8O 3) in 201 g of ethanol The freezing point of the solution is ________°C. The freezing point of pure ethanol is -114.6oC at 1 atm. The molal-freezing-point-depression constant (K f) for ethanol is 1.99oC/m The molar masses of glycerin and of ethanol are 92.1 g/mol and 46.1 g/mol, respectively.

A. -115.4

B. 0.752

C. -113.8

D. -121.3

E. -107.9

Question #24

Using the VSEPR model, the molecular geometry of the central atom in XeF 2 is __________.

A. trigonal planar

B. bent

C. trigonal pyramidal

D. linear

E. tetrahedral

Question #25

How many of the following molecules have sp 2 hybridization on the central atom? HCN SO 2 OCl 2 XeCl 2

A. 1

B. 3

C. 2

D. 4

E. 0

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