Thermal Concepts (3.1)
Modelling a gas (3.2)
Energy Source (8.1)
Energy Transfer (8.2)
Mystery
100
What is the definition of specific heat capacity?
the energy transferred to 1 kg of a substance causing its temperature to increase by 1 K.
100
As air passes through an air conditioner, its temperature decreases but its pressure remains constant.
How does the density of the air change?
Increases
100
Name 3 Non-Renewable energy source.
Coal, Fossil Fuel, Uranium 235, Natural gas
100
Name four greenhouse gases
Carbon dioxide, water vapour, Methane, Nitrous Oxide, Ozone, Chlorofluorocarbon
100
What is meant by the statement that the average albedo of the Moon is 0.1?
10% of the radiation incident on the Moon is reflected by its surface
200
What motion can liquid particles make in the atomic level?
A. Vibration
B. Rotation
C. Translation
D. All of the above
D. All of the above
200
Under what conditions does a real gas approximate to an ideal gas?
Low pressure, high temperature and low density.
200
What is the purpose of the moderator in a nuclear fission reactor?
Remove kinetic energy from neutrons to increase the likelihood of fission
200
What factors will affect the rate of heat energy transfer?
thermal conductivity, cross-section area, length
200
What's the name of Ms.Cheng's dog
Kiwi
300
Ice at 0 degree celsius is mixed with water at 0 degree celsius in a perfectly insulated calorimeter. What will happen?
No ice will melt and no water will freeze.
300
A sealed container contains one mole of H2 gas and one mole of O2 gas. The gases are in thermal equilibrium.
Gas pressure, p, is exerted on the walls of the container by the hydrogen. In terms of p, determine the gas pressure exerted by the oxygen.
Relative mass of one molecule of H2 = 2u
Relative mass of one molecule of Oxygen = 32u
p
300
Most power stations rely on a turbine and a generator to produce electrical energy. Which power station works on a different principle?
Solar
300
A flask meant to hold hot drinks is sealed tightly shut by a metal stopper. The purpose of the stopper is to minimize heat loss from…
Convection
300
What is the relation between the value of the unified atomic mass unit in grams and the value of Avogadro’s constant in mol−1?
Their product is 1.
400
What are the units of the ratio (specific heat capacity of copper)/(specific latent heat of vaporization of copper)?
k-1
400
Q and R are two rigid containers of volume 3V and V respectively containing molecules of the same ideal gas initially at the same temperature. The gas pressures in Q and R are p and 3p respectively. The containers are connected through a valve of negligible volume that is initially closed.
The valve is opened in such a way that the temperature of the gases does not change. What is the change of pressure in Q?
+p/2
400
What is the correct order of energy transformations in a coal power station?
chemical → thermal → kinetic → electrical
400
why an average value should be used for the solar constant?
I. The Sun’s output varies during its 11 year cycle.
II. The Earth is in elliptical orbit around the Sun
400
Which University did Dr.P went for her undergraduate degree?
University of Guelph
500
An insulated tube is filled with a large number n of lead spheres, each of mass m. The tube is inverted s times so that the spheres completely fall through an average distance L each time. The temperature of the spheres is measured before and after the inversions and the resultant change in temperature is ΔT.
What is the specific heat capacity of lead?
(sgL)/(\DeltaT)
500
A thin-walled cylinder of weight W, open at both ends, rests on a flat surface. The cylinder has a height L, an average radius R and a thickness x where R is much greater than x.
(W)/(2\piRx)
500
Explain how a nuclear thermal power station could generate electricity.
Nuclear power plants use heat produced during nuclear fission to heat water. ... The heat produced during nuclear fission (Uranium 235) in the reactor core is used to boil water into steam, which turns the blades of a steam turbine. As the turbine blades turn, current is induced in the magnetic field of the generator, thus generating electricity
500
Could we ever have a perfect black body? Justify your answer.
NA
500
What's the value of Avogadro’s constant?
6.02214076×10²³