Unit 6 PBoM

• Know what quantity each unit represents!

• Use Table D (cover page of the reference table) to check.

Multiple Choice

g or gram is representing...

• mass

• pressure

• volume

• heat

Multiple Choice

mL or milliliter is representing...

Note: milliliter is 1/1000 of Liter

• mass

• pressure

• volume

• heat

Multiple Choice

KJ or kilojoule is representing...

Note: a kilojoule is 1000 joules

• mass

• pressure

• volume

• heat

Multiple Choice

Which unit DOES NOT represent pressure?

• mmHg

• mL

• kPa

• atm

• torr

Multiple Choice

Regents Practice: When a quantity of electricity is converted to heat, the heat energy produced is measured in...

• amperes

• volts

• joules

• degrees

Multiple Choice

Convert -16 °C to K.

• -289

• 273

• 257

• 16

Multiple Choice

Convert 50 K to °C.

• 323

• -223

• 273

• -50

Multiple Choice

Regents Practice: What is the equivalent of 0 Kelvin on the Celsius scale?

• -100°

• 100°

• -273°

• 273°

Multiple Choice

Regents Practice: Which Kelvin temperature is equal to -73°C?

• 346K

• 200 K

• 173 K

• 100 K

Multiple Choice

Regents Practice: which substance has vibrating particles in regular fixed positions?

• Ca(s)

• Hg(l)

• CaCl₂(aq)

• Cl₂(g)

Multiple Choice

Regents Practice: Two basic properties of the gas phase are

• a definite shape but no definite volume

• no definite shape and no definite volume

• no definite shape but a definite volume

• a definite shape and a definite volume

Multiple Choice

Regents Practice: Which 5.0-milliliter sample of NH₃ will take the shape of and completely fill a closed 100-milliliter container?

• NH₃(aq)

• NH₃(s)

• NH₃(l)

• NH₃(g)

​

Multiple Choice

When the temperature increases...

• PE increases

• KE increases

• PE decreases

• KE decreases

Multiple Choice

When the temperature decreases...

• PE increases

• KE increases

• PE decreases

• KE decreases

Multiple Choice

When the phases go from solid to liquid (endothermic)...

• PE increases

• KE increases

• PE decreases

• KE decreases

Multiple Choice

Regents Practice: As ice melts at standard pressure, its temperature remains at 0°C Until it has completely melted. Its potential energy...

• decreases

• increases

• remains the same

Multiple Choice

Regents Practice: At which temperature would the molecules in a one gram sample of water have the lowest average kinetic energy?

(remember: average kinetic energy = temperature)

• 100 K

• 5°C

• -100°C

• 5 K

Multiple Choice

Regents Practice: In which flask do the molecules of H2O have the greatest kinetic energy?

• 1

• 2

• 3

• 4

Multiple Choice

Regents Practice: Which graph best shows the relationship between Kelvin temperature and average kinetic energy?

Multiple Choice

Regents Practice: The temperature of a substance is a measure of its particles

• average potential energy

• specific heat

• average kinetic energy

• total energy

Multiple Choice

Regents Practice: As ice at 0°C changes to water at 0°C, the average kinetic energy of the ice molecules

• decreases

• increases

• remains the same

Multiple Choice

Regents Practice: Which change of phases is exothermic?

• CO₂ (s) -> CO₂ (g)

• H₂O (l) -> H₂O (s)

• NaCl(s) -> NaCl (l)

• H₂O (s) -> H₂O (g)

Multiple Choice

Regents Practice: The graph represents the relationship between temperature and time as heat is added uniformly to a substance, starting when the substance is solid below its melting point.

Which portions of the graph represent times when heat is absorbed and potential energy increases while kinetic energy remains constant?

• B and D

• A and C

• C and D

• A and B

Multiple Choice

Regents Practice: A student observing the behavior of para dichlorobenzene first heats 10 grams of the substance in a hot water bath until it is completely liquefied. The following data are recorded as paradichlorobenzene cools.

• 53 °C

• 65°C

• 58°C

• 42°C

Multiple Choice

Regents Practice: The graph below represents the uniform heating of a substance, starting with the substance as a solid below its melting point.

Which segment of the graph represents a time when both the solid and liquid phases are present?

• AB

• BC

• DE

• EF

Multiple Choice

Regents Practice: Two samples of gold that have different temperatures are placed in contact with one another.

Heat will flow spontaneously from a sample of gold at 60°C to a sample of gold that has a temperature of...

• 80°C

• 70°C

• 50°C

• 60°C

Multiple Choice

Regents Practice: The strongest intermolecular forces of attraction exist in a liquid whose heat of vaporization is...

• 100 J/g

• 200 J/g

• 300 J/g

• 400 J/g

Multiple Choice

What is c (specific heat capacity) for H₂O?

• 334

• 2260

• 4.18

Multiple Choice

What is the Heat of Fusion for H₂O?

• 334

• 2260

• 4.18

Multiple Choice

If the phase of water changes from liquid to solid, which number are you going to use?

• 334

• 2260

• 4.18

Multiple Choice

If the phase of water changes from liquid to gas, which number are you going to use?

• 334

• 2260

• 4.18

Multiple Choice

Regents Practice: What is the total number of kilojoules of heat needed to change 150. grams of ice to water at 0°C?

• 50.1

• 2.22

• 184

• 484

Multiple Choice

Regents Practice: The temperature of 15 grams of water is increased by 3.0 Celsius degrees. How much heat was absorbed by the water?

For this question, which heat calculation formula will you use?

• q = mCΔt because there's a temperature change!

• q = mH_f because the phase is changing from solid to liquid

• q = mH_v because the phase is changing from liquid to gas

Multiple Choice

Regents Practice: The temperature of 15 grams of water is increased by 3.0 Celsius degrees. How much heat was absorbed by the water?

• 189 J

• 21 J

• 50 J

• 76 J

Multiple Choice

Regents Practice: What is the total number of kilojoules of heat needed to change 150. grams of ice to water at 0°C?

For this question, which heat calculation formula will you use?

• q = mCΔt because there's a temperature change!

• q = mH_f because the phase is changing from solid to liquid

• q = mH_v because the phase is changing from liquid to gas

Multiple Choice

Regents Practice: What is the total number of kilojoules of heat needed to change 150. grams of ice to water at 0°C?

• 50.1

• 2.22

• 184

• 484

Multiple Choice

Regents Practice: At 1 atmosphere of pressure, 25.0 grams of a compound at its normal boiling point is converted to a gas by the addition of 34,400 Joules. What is the heat of vaporization for this compound in Joules per gram?

• 25.0 J/g

• 34,400 J/g

• 2,260 J/g

• 1376 J/g

Multiple Choice

Regents Practice: At 1 atmosphere of pressure, 25.0 grams of a compound at its normal boiling point is converted to a gas by the addition of 34,400 Joules. What is the heat of vaporization for this compound in Joules per gram?

For this question, which heat calculation formula will you use?

• q = mCΔt because there's a temperature change!

• q = mH_f because the phase is changing from solid to liquid

• q = mH_v because it mentioned "heat of vaporization"

Multiple Choice

Regents Practice: At 1 atmosphere of pressure, 25.0 grams of a compound at its normal boiling point is converted to a gas by the addition of 34,400 Joules. What is the heat of vaporization for this compound in Joules per gram?

For this question, which variable you are trying to find?

• mass (m)

• heat (q)

• Heat of Vaporization (H_v)

Multiple Choice

Regents Practice: At 1 atmosphere of pressure, 25.0 grams of a compound at its normal boiling point is converted to a gas by the addition of 34,400 Joules. What is the heat of vaporization for this compound in Joules per gram?

• 25.0 J/g

• 34,400 J/g

• 2,260 J/g

• 1376 J/g

Multiple Choice

Regents Practice: The graph represents the vapor curves of four liquids.

Which liquid has the highest normal boiling point?

• A

• B

• C

• D

Multiple Choice

Regents Practice: which graph shows the pressure-temperature relationship expected for an ideal gas?

Multiple Choice

Regents Practice: Under which conditions does a real gas behave most like an ideal gas?

• at high temperatures and high pressures

• at high temperatures and low pressures

• at low temperatures and low pressures

• at low temperatures and high pressures

Multiple Choice

Regents Practice: One reason that a real gas deviates from a ideal gas is that the molecules of the real gas have

• a straight-line motion

• no net loss of energy on collision

• forces of attraction for each other

• a negligible volume

Multiple Choice

Regents Practice: Which of the following gases behave most like an ideal gas?

• CO₂ (g)

• NH₃ (g)

• O₂ (g)

• H₂ (g)

Multiple Choice

Regents Practice: Under which conditions will the volume of a given sample of a gas decrease?

• increased pressure and decreased temperature

• decreased pressure and decreased temperature

• increased pressure and increased temperature

• decreased pressure and increased temperature

Multiple Choice

Regents Practice: The volume of a 1.00-mole sample of an ideal gas will increase when,,,

• increased pressure and decreased temperature

• decreased pressure and decreased temperature

• increased pressure and increased temperature

• decreased pressure and increased temperature

Multiple Choice

Regents Practice: which graph represents the relationship between volume and Kelvin temperature for an ideal gas at constant pressure?

​Same temperature, pressure, and volume

=> equal number of molecules!

Multiple Choice

Regents Practice: Each stoppered flask on the left contains 2 liters of a gas at STP. Each gas sample has the same

• number of molecules

• mass

• number of atoms

• density

Multiple Choice

Regents Practice: When 7.00 moles of gas A and 3.00 moles of gas B are combined, the total pressure exerted by the gas mixture is 76.0 kPa. What is the partial pressure exerted by gas A in this mixture?

Which law will you use to answer this question?

• Mole Fraction, because you are given with volumes and pressures, not only pressures.

• Partial Pressure, because you are given ONLY with pressures.

Multiple Choice

Regents Practice: When 7.00 moles of gas A and 3.00 moles of gas B are combined, the total pressure exerted by the gas mixture is 76.0 kPa. What is the partial pressure exerted by gas A in this mixture?

• 22.8 kPa

• 53.2 kPa

• 7.60 kPa

• 76.0 kPa

Multiple Choice

Regents Practice: A sample of oxygen gas has a volume of 150. milliliters at 300 K. If the pressure of the sample is held constant and the temperature is raised to 600 K, the new volume of the sample will be....

Which law will you use to answer this question?

• Mole Fraction, because you are given with volumes and pressures, not only pressures.

• Partial Pressure, because you are given ONLY with pressures.

Multiple Choice

Regents Practice: A sample of oxygen gas has a volume of 150. milliliters at 300 K. If the pressure of the sample is held constant and the temperature is raised to 600 K, the new volume of the sample will be....

• 150. mL

• 300. mL

• 600 mL.

• 75.0 mL

Multiple Choice

Regents Practice: Gas samples A, B, and C are contained in a system at STP. The partial pressure of sample A is 38.0 kPa and the partial pressure of sample B is 19.0 kPa. What is the partial pressure of sample C?

Which law will you use to answer this question?

• Mole Fraction, because you are given with volumes and pressures, not only pressures.

• Partial Pressure, because you are given ONLY with pressures.

Multiple Choice

Regents Practice: Gas samples A, B, and C are contained in a system at STP. The partial pressure of sample A is 38.0 kPa and the partial pressure of sample B is 19.0 kPa. What is the partial pressure of sample C?

• 44.3 kPa

• 63.3 kPa

• 19.0 kPa

• 38.0 kPa