Scio.ly | University of Georgia Invitational

Question 1

1 pt

What was the name of the scientist who discovered a refrigeration cycle and invented the first industrial-scale air separation and gas liquefaction processes?

A. William CullenB. Carl von LindeC. Rudolf ClausiusD. James Prescott Joule

Question 2

1 pt

Which law of thermodynamics defines temperature?

A. 0ᵗʰ law of thermodynamicsB. 1ˢᵗ law of thermodynamicsC. 2ⁿᵈ law of thermodynamicsD. 3ʳᵈ law of thermodynamics

Question 3

1 pt

Josiah Willard Gibbs’ papers in the 1870’s introduced the idea of which of the following?

A. The combination of the 1ˢᵗ and 2ⁿᵈ laws of thermodynamics through an equation describing the change in internal energy of a closed systemB. An in-depth description of the 0ᵗʰ law and the concept of thermal equilibriumC. The product of pressure and volume of an ideal gas is constant under a constant number of moles of gas and temperatureD. The compression factor, Z

Question 4

1 pt

Which scientist is responsible for the concept of the infamous “perfect” engine?

A. John EricssonB. William RankineC. George BraytonD. Nicolas Carnot

Question 5

1 pt

Convert 43.7°C to °R.

A. 316.85°RB. 570.33°RC. -248.87°RD. 110.66°R

Question 6

1 pt

For the operational definition of temperature, which of the following is NOT a condition?

A. Substance with property that depends on temperatureB. Reference points to define the temperature scaleC. A linear interpolation scheme between reference pointsD. Thermal equilibrium between at least two bodies/systems

Question 7

1 pt

The point at which two liquidus lines intersect on phase diagram is known as which of the following?

A. Isothermal pointB. Peritectic pointC. Eutectic pointD. Solvus point

Question 8

1 pt

Which of the following is true for ideal gases?

A. Gas molecules move independently of each otherB. There are no interactions or forces exerted on or between the gas moleculesC. Energy is of the kinetic form onlyD. All of the above

Question 9

1 pt

A sample of gas is confined to a 5.00 L container at 300.0 K and 100.0 kPa. What volume will the gas occupy when the pressure is reduced to 300.0 Torr and temperature is increased to 100.0°C?

A. 17.2 LB. 22.5 LC. 10.1 LD. 15.5 L

Question 10

1 pt

What mass of oxygen gas (at 300.0 K & 100.0 kPa) is required to completely burn 1.00 gram of butane (C₄H₁₀)? (Hint: write out the equation for combustion of butane)

A. 3.58 gB. 0.62 gC. 1.15 gD. 4.67 g

Question 11

1 pt

A copper cylinder has a mass of 76.8 g and a specific heat of 0.092 cal/g·C. It is heated to 86.5°C and then put in 68.7 g of turpentine whose temperature is 19.5°C. The final temperature of the mixture is 31.9°C. What is the specific heat of the turpentine?

A. 0.45 cal/g·CB. 0.56 cal/g·CC. 1.21 cal/g·CD. 0.22 cal/g·C

Question 12

1 pt

Which of the following is a possible use for a material with a low specific latent heat of vaporization?

A. Acting as a heat sink in a refrigeratorB. Cooling an object down through evaporationC. Providing heat for central heating systemsD. Absorbing heat through through fusion

Question 13

1 pt

An instant hot-pack or hand warmer, when activated, is an example of what kind of process?

A. IsothermalB. IsenthalpicC. AdiabaticD. Isobaric

Question 14

1 pt

A Carnot engine operates with an efficiency of 40%. How much must the temperature of the hot reservoir increase, so the efficiency increases to 50%? The temperature of the cold reservoir stays at 9°C.

A. +282 KB. +155 KC. +82 KD. +94 K

Question 15

1 pt

For the Joule-Thomson experiment, which of the following variables remains constant?

A. Internal energyB. EnthalpyC. EntropyD. Work

PassageFor questions 16a, 16b

(Tie-breaker #1) In a closed system process, 60 Btu of heat are added to the system, and the internal energy of the system increases by 220 Btu.

Question 16a

1 pt

Write the simplified energy balance for the process.

Question 16b

1 pt

Calculate the work of the process (in Btu).

PassageFor questions 17a, 17b

(Tie-breaker #2) Two moles of gas at 1 bar and 298 K are compressed at constant temperature by use of a constant pressure of 5 bar.

Question 17a

1 pt

How much work (in J) is done on the gas?

Question 17b

1 pt

If the compression is driven by a 100 kg mass, how far (in m) will the mass fall in the earth’s gravitational field?