Concepts of Chemistry Exam 3

Question 1

Concepts of Chemistry Exam 3. What is the equivalent pressure of 760 torr in units of mm Hg?

• 760
• 1
• 14.7
• 29.92
• none of the above

Question 2

Ammonia gas decomposes according to the equation: 2NH3(g) → N2(g) + 3H2(g). If 15.0 L of nitrogen is formed at STP, how many liters of hydrogen will be produced (also measured at STP)?

• 15.0 L
• 30.0 L
• 45.0 L
• 90.0 L
• not enough information

Question 3

How many liters of O2 (g) are needed to react completely with 56.0 L of CH4 (g) at STP to produce CO2 (g) and H2O (g)? Given: CH4 (g) + 2O2 (g) → CO2 (g) + H2O (g)

• 28.0 L
• 56.0 L
• 84.0 L
• 112. L
• none of the above

Question 4

A balloon filled with 0.500 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. What is the volume of the balloon at this depth?

• 1.63 L
• 0.154 L
• 6.50 L
• 0.615 L
• none of the above

Question 5

The initial volume of a gas cylinder is 750.0 mL. If the pressure of a gas inside the cylinder changes from 840.0 mm Hg to 360.0 mm Hg, what is the final volume the gas occupies?

• 3.151 L
• 630.0 mL
• 1.750 L
• 321.4 mL
• none of the above

Question 6

What is the equivalent pressure of 0.905 atm in units of mm Hg?

• 688
• 840
• 0.905
• 13.3
• none of the above

Question 7

If the initial pressure of a system was 1.00 atm and the volume was halved and the kelvin temperature was tripled, what is the final pressure?

• 2.00 atm
• 0.667 atm
• 1.50 atm
• 6.00 atm
• not enough information

Question 8

Which intermolecular force increases with increasing molar mass?

• dispersion forces
• dipole-dipole forces
• hydrogen bonding
• X-forces
• none of the above

Question 9

Evaporation is:

• increased by increasing temperature.
• an endothermic process.
• the opposite process to condensation.
• a cooling process for humans when they sweat.
• all of the above

Question 10

Which compound will have the highest boiling point?

• CH4
• CH3CH3
• CH3C(O)CH3
• CH3CH2OH
• not enough information

Question 11

The amount of heat required to melt one mole of a solid is called the: Concepts of Chemistry Exam 3

• heat of vaporization.
• heat of fusion.
• heating curve.
• cooling curve.
• none of the above

Question 12

Silicon is which type of solid?

• molecular solid
• covalent atomic solid
• metallic atomic solid
• ionic solid
• nonbonding atomic solid

Question 13

Which state of matter has a low density and is easily compressed?

• solids
• liquids
• gases
• both solids and liquids
• none of the above

Question 14

The tendency of a liquid to minimize its surface area is called:

• capillary action.
• viscosity.
• surface tension.
• vaporization.
• none of the above

Question 15

When you make ice cubes:

• it is an endothermic process.
• it is an exothermic process.
• the heat of vaporization must be removed.
• the process is referred to scientifically as sublimation.
• none of the above

Question 16

Which of the following statements is false?

• Evaporation is an endothermic process.
• A puddle of water cools down as it evaporates.
• As a liquid is converted into a gas, the liquid absorbs heat.
• All of the above are true.
• None of the above are true.

Question 17

Which intermolecular force is due to the formation of an instantaneous dipole?

• dispersion forces
• dipole-dipole forces
• hydrogen bonding
• X-forces
• none of the above

Question 26

The subshell that has five orbitals and can hold up to ten electrons is the:

• d subshell
• f subshell
• s subshell
• p subshell
• none of the above

Question 27

What is the maximum number of electrons that can occupy the n = 3 shell?

• 2
• 8
• 18
• 32
• none of the above

Question 28

Which of the following elements has the electron configuration [Ar]4s23d104p3?

• As
• P
• Sb
• Se
• none of the aboveConcepts of Chemistry Exam 3

Question 29

The vertical columns on the periodic table are called:

• periods.
• groups.
• rows.
• metals.
• none of the above

Question 30

Which element has the highest ionization energy?

• He
• Ne
• Ar
• Kr
• Xe

Question 31

What is the valence electron configuration for the halogens? Concepts of Chemistry Exam 3

• ns1
• ns2
• ns2np3
• ns2np5
• ns2np6

Question 32

Which of the following is a transition metal?

• Ca
• Fe
• Al
• Si
• none of the above

Question 33

The size of an atom generally:

• increases down a group and decreases across a period.
• decreases down a group and increases across a period.
• increases down a group and increases across a period.
• decreases down a group and decreases across a period.
• none of the above

Question 34

How many valence electrons does phosphorus (P) have?

• 3
• 5
• 15
• 31
• none of the above

Question 35

Which of the following atoms has the largest atomic radius?

• Li
• Na
• K
• Rb
• Cs