QUESTION 1 If very high temperatures cause the electrons to be separated from in
ID: 3281446 • Letter: Q
Question
QUESTION 1
If very high temperatures cause the electrons to be separated from individual atoms and molecules, the material is then said to be in what phase?
solid
plasma
liquid
gas
10 points
QUESTION 2
A thermodynamic device that transfers heat from a low-temperature reservoir to a high-temperature reservoir by using work input for this specific purpose is called a
heat engine.
heat pump.
Carnot process.
phase changer.
10 points
QUESTION 3
In SI units, pressure is expressed in N/m2, or
kelvins.
°C.
pascals.
cubic meters.
10 points
QUESTION 4
Radiation is the only possible means of energy transfer in
a hot-water heating system.
matter whose molecules are not totally free to move.
gases.
outer space, where all matter is essentially absent.
10 points
QUESTION 5
A quantity of steam (200 g) at 110° C is condensed and the resulting water is frozen into ice at 0° C. How much heat was removed?
220 kcal
315 Joules
145 kcal
289 kcal
10 points
QUESTION 6
The first law of thermodynamics says that
any heat added to a system goes into internal energy of the system and/or work.
a heat engine is a device that does nothing but convert heat energy into work.
heat flows spontaneously from a hot body to a cold body.
it is impossible to reach the temperature of absolute zero.
10 points
QUESTION 7
The amount of heat required to produce a phase change for 1 kg of any substance at the melting point is called
the specific heat.
the ice point.
sublimation.
the latent heat of fusion.
10 points
QUESTION 8
A ball dropped from a height of 2.5 m strikes the ground with a speed of 6.6 m/s. What percentage of the ball’s potential energy was lost because of air resistance?
56%
0%
23%
11%
10 points
QUESTION 9
Applying the first law of thermodynamics to a gas in a cylinder with a movable piston and assuming the gas itself remains at a constant temperature, any heat added to the gas would produce
work done on the gas.
an increase in the velocity of the gas molecules.
work done by the gas to move the piston.
no work or internal energy change for the gas.
10 points
QUESTION 10
A recipe calls for a cake to be baked at 180° C. On what temperature Fahrenheit should the oven be set?
356
425
375
300
solid
plasma
liquid
gas
Explanation / Answer
(1) If very high temperatures cause the electrons to be separated from individual atoms and molecules, the material is then said to be in plasma phase.
(2) A thermodynamic device that transfers heat from a low-temperature reservoir to a high-temperature reservoir by using work input for this specific purpose is called a heat pump.
(3) In SI units, the pressure is expressed in N/m2, or Pascals.
(4) Radiation is the only possible means of energy transfer in outer space, where all matter is essentially absent.
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