Chemistry Final Exam ll

A typical barometric pressure in Kansas City is 740 torr. What is this pressure in atmospheres, in millimeters of mercury, and in kilopascals?

101.3 kPa

A large scuba tank with a volume of 18 L is rated for a pressure of 220 bar. The tank is filled at 20 °C and contains enough air to supply 1860 L of air to a diver at a pressure of 2.37 atm (a depth of 45 feet). Was the tank filled to capacity at 20 °C?

A. The tank was filled to capacity
B. The tank was not filled to capacity
C. The tank was empty

D. The tank was overfilled

D

A 20.0-L cylinder containing 11.34 kg of butane, C4H10, was opened to the atmosphere. Calculate the mass of the gas remaining in the cylinder if it were opened and the gas escaped until the pressure in the cylinder was equal to the atmospheric pressure, 0.983 atm, and a temperature of 27  °C.

46.4 g

What term describes the sum of a system’s internal energy and the mathematical product of its pressure and volume?

A. calorimetry

B. bond energy

C. enthalpy 

D .heat

C

What term describes the energy required to break a covalent bond in a gaseous substance?

 

A. calorimetry

B. heat

C. enthalpy

D. bond energy

D

What term describes the extensive property of a body of matter that represents the quantity of heat required to increase its temperature by 1 degree Celsius (or 1 kelvin)?

A. heat capacity

B. molarity

C. enthalpy

D. calorimity

A

Would you expect a liquid (molten) ionic compound to be electrically conductive or nonconductive?

A. nonconductive 

B. conductive

C. neither
D. both

b

Compare the processes that occur when methanol (CH₃OH) dissolves in water.

A. Methanol, CH3OH, dissolves in water in all proportions, but does not interact via hydrogen bonding.

B. Methanol, CH3OH, does not dissolve in water in all proportions, interacting via hydrogen bonding.

C. Methanol, CH3OH, dissolves in water in all proportions, interacting via hydrogen bonding.

D. None of these.

C

Compare the processes that occur when sodium hydroxide (NaOH) dissolves in water.

A. Sodium hydroxide, NaOH, dissolves in water and dissociates to yield sodium cations and hydroxide anions that are strongly solvated by ion-dipole interactions and hydrogen bonding, respectively

B. Sodium hydroxide, NaOH, does not dissolve in water and does not dissociate to yield sodium cations and hydroxide anions.

C. Sodium hydroxide, NaOH, does not dissolve in water but it does dissociate to yield sodium cations and hydroxide anions that are strongly solvated by ion-dipole interactions and hydrogen bonding, respectively.

D.None of these.

A

Is a system at equilibrium if the rate constants of the forward and reverse reactions are equal?

A. Yes, the rate constants having the same value does mean that the rates of the reactions are equal, which defines a system being at equilibrium.

B. No, the rate constants having the same value does mean that the rates of the reactions are equal, which defines a system being at equilibrium.

C. No, the rate constants having the same value does not mean that the rates of the reactions are equal, which defines a system being at equilibrium.

D. None of these.

C

Benzene is one of the compounds used as octane enhancers in unleaded gasoline. It is manufactured by the catalytic conversion of acetylene to benzene: 3C2H2(g)⇌C6H6(g). Which value of Kc would make this reaction most useful commercially?

10

For a titration to be effective, the reaction must be rapid and the yield of the reaction must essentially be 100%. Is Kc > 1, < 1, or ≈ 1 for a titration reaction?

Kc > 1

What is the ground-state electron configuration of calcium? 

1. 1s²2s²2p⁶3s²3p⁵4s²

2. 1s²2s²2p⁶

3. 1s²2s²2p⁶3s²3p⁶4s²

4. 1s²2s²2p⁶3s²

c

Which of the following sets of elements are the most similar to each other?

A. Te, Ag, Pd

B. F, Cl, Br, I

C. C, N, O, F

D. H, He

B

According to the octet rule, which of elements will have a tendency to loss 2 electrons?
 

A. hydrogen

B. oxygen

C. strontium

D. cesium

C

Construct the molecule IF₅ using a molecular modeling software such as Spartan or 3D-ChemDraw. What are the bond angles of the equatorial fluorine’s in the structure?

90

Which of the following compounds contains the largest number of atoms?

 

A. 1.00 mole of NH3

B. 1.00 mole of H2SO4

C. 1.00 mole of HBr

D. 1.00 mole of H

B

How many atoms are in 1.00 mole of Au?

1. 6.02 x 10²³ atoms

2. 1.66 x 10^-24 atoms

3. 1.2 x 10²³ atoms

4. 197 atoms

A

A 0.125 g sample of unknown hydrocarbon is prepared for combustion analysis. After the hydrocarbon undergoes complete combustion, 0.4225 g of CO₂ and 0.0865 g of H₂O are produced. What is the empirical formula of the unknown?

1. CH₃

2. CH

3. 2C2H

4. CH₂

B

Which of the following is a strong acid?

1. HNO

2. CaSO₄

3. HNO₃

4. NH₃

C

A 15.0 g sample of a white, solid substance, is heated in the presence of air. The solid remaining after heating has a mass of 12.6 g. The reaction that took place must have been a/an:

 

A. recombination reaction

B. combination reaction

C. displacement reaction

D .decomposition reaction

D

On a very cold day, you notice that your tires look a bit deflated than warmer days. This observation can be explained by _____.

 

A. Boyles law

B. Universe law

C. Ideal gas law

D. Charles law

D