Question

A)

Given the following heat capacities of materials, which one,
assuming equal mass and temperature changes, would be best able to
**store the smallest amount of thermal energy**?

Group of answer choices

100 J/(kg °C)

0.1 J/(kg °C)

1 J/(kg °C)

1000 J/(kg °C)

B)

Given the following heat capacities of materials, which one,
assuming equal mass and temperature changes, would be best able to
**store the largest amount of thermal energy**?

k is the metric prefix for 1000

Group of answer choices

0.1 J/(kg °C)

0.1 J/(g °C)

10 kJ/(g °C)

0.1 kJ/(g °C)

C)

For an ideal gas, moving in three dimensions at **1000
000K**, molecules of the gas:

Group of answer choices

are twice as massive as they are at room temperature

have a negligible amount of kinetic energy when compared to room temperature

exert a smaller amount of pressure when compared to room temperature

have a larger amount of kinetic energy when compared to room temperature

Answer #1

Specific Heat Capacity of the material is a measure of it's ability to store heat. Greater the specific heat capacity, greater will be its ability to store heat.

A) out of given options, lowest specific heat capacity is 0.1 J/ Kg°C ( 2nd option). This will store lowest heat.

B) out of the given options, highest specific heat capacity is 10 kJ/g°C (3rd option). This stores maximum heat.

c) Kinetic energy of the molecules is directly proportional to temperature.

K.E = (3/2) Kb T where Kb - Boltzmann constant & T- Temperature.

So last option is right.

How many joules heat must be added to 2.0 kg of ice at a
temperature of -30 °C to bring it to room temperature 20 °C?
(Specific heat capacity of ice is 2100 J/kg °C).
(Specific heat capacity of water is 4186 J/kg °C).
(Latent heat of water-ice is 3.33x105 J/kg)
Group of answer choices
126.52 kJ
959.44 kJ
4293.44 kJ
668.78 kJ

Specific heat is the heat necessary to raise the temperature of
1kg of a given material by 1∘C. This specific heat value varies by
material with metals having relatively low specific heat with
organic materials and water being very high. The specific heat of
mercury is 140 J/kg∘C and the specific heat of water is 4190
J/kg∘C.
Part A 106 J of heat energy are transferred to 26.5 g of
mercury. By how much does the temperature increase?
Part B...

Which statement is wrong?
1. Temperature measures the average kinetic energy of random
motion, but not other kinds of energy.
2. When the same amount of heat produces different changes in
temperature in two substances of the same mass, we say that they
have different specific heat capacities.
3. Each substance has its own characteristic specific heat
capacity.
4. Different substances have different thermal properties due to
differences in the way energy is stored internally in the
substances.
5. Adding...

a tube-within-a-tube heat
exchanger operating at steady state is composed of one pipe
containing
Refrigerant 134a and another pipe containing an ideal gas with
constant specific heat at constant
pressure of 1.2 kJ/(kg∙K). The refrigerant 134a enters the heat
exchanger in a saturated liquid state
and exits the heat exchanger in a saturated vapor state. The
temperature and mass flow rate of the
refrigerant 134a are -20° C and 3 kgs/s, respectively, at both its
inlet and outlet. The ideal...

Part A
A copper pot of mass 2.5 kg contains 5.2 litres of water (i.e.
5.2 kg) at room temperature (200C). An iron block of
mass 9.4 kg is dropped into the water and when the system comes
into thermal equilibrium, a temperature of 380C is
measured. What is the initial temperature of the iron block? Give
your answer in oC to three significant figures.
Part B
Iron has a specific heat that is larger than that of copper. A...

Analyze a Gas turbine engine at a design speed under
the following data employing a separate power turbine, heat
exchanger, reheater and intercooler between two-stage
compression. Efficiency of compression in each stage: 85%
Isentropic efficiency of compressor turbine: 90% Isentropic
efficiency of power turbine: 85% Transmission efficiency: 98%
Pressure ratio in each stage of compression: 2:1 Pressure loss in
intercooler: 0.07 bar Temperature after intercooling: 300 K
Thermal ratio of...

2. An aluminum scuba tank, which has an internal volume of 11.1
L, is filled with air to a pressure of 3000 psi when at room
temperature (i.e. 20.0 OC). A diver takes the tank into seawater,
where the water temperature is 46 degrees Fahrenheit (i.e. 8.00OC).
To what pressure does the air in the tank drop? (The thermal
coefficient of expansion for aluminum is 24.0x10-6 OC -1 .)
Answer: 2880 psi
Don't need #2, just #3 please.
3. For...

Diamond
a. At 298 K, what is the Gibbs free energy change G for the
following reaction? Cgraphite -> Cdiamond
b. Is the diamond thermodynamically stable relative to graphite
at 298 K?
c. What is the change of Gibbs free energy of diamond when it is
compressed isothermally from 1 atm to 1000 atm at 298 K?
d. Assuming that graphite and diamond are incompressible,
calculate the pressure at which the two exist in equilibrium at 298
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e....

Question 1
Which of the following is an endothermic process?
a) freezing of water
b) fuel burning in a car engine
c) combustion of cooking gas
d) vaporization of water
Question 2
Which of the following signs on q and w represent a system that is
doing work on the surrounds, as well as losing heat to the
surroundings?
a) -q, -w
b) +q, +w
c) +q, -w
d) None of the above
e) -q, +w
Question 3
Lead, water,...

1) A hot air balloon consists of a very large bag filled with
heated air at 120.0 °C produced from a propane burner. It has a
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a) Determine the work (in kJ) needed to inflate the balloon under
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