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WorksheetsThermal properties (1)
Total questions: 25
Worksheet time: 25mins
What is heat capacity ?
The amount of thermal energy required to raise the temperature of a substance by 1K or 1°C
The amount of thermal energy required to raise the temperature of a 1kg mass of substance by 1K or 1°C
The amount of thermal energy required to change a substance from liquid state to gaseous state without a change in temperature
The amount of thermal energy required to change 1kg of the substance from liquid state to gaseous state, without a change in temperature
Latent heat is
the heat absorbed or released at a boiling process during a change of phase
the heat absorbed or released at a constant temperature during a change of phase
the heat absorbed or released at a constant temperature during a change of phase per 1 kg
the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celsius
The graph shows the cooling curve of a substance. At which stages the specific latent heat released?
AB and CD
BC and DE
AB and EF
BC and CD
State what occurs during freezing/condensation?
Internal Kinetic Energy remains constant, Internal Potential Energy decreases
Internal Kinetic Energy remains decreases, Internal Potential Energy decreases
Internal Kinetic Energy remains constant, Internal Potential Energy remains constant
Internal Kinetic Energy remains constant, Internal Potential Energy increases
The temperature shown by a mercury -in glass thermometer increases.Which of the following is constant.
the density of the mercury
the internal energy of the mercury
the mass of the mercury
the volume of the mercury
Why does a pure substance melt at a constant temperature?
Negligible (i.e. very little) heat is absorbed during this process.
All pure substances melt at 0°C.
The heat absorbed during melting is used to increase the kinetic energies of the particles, and not the temperature of the substance.
The heat absorbed during melting is used to break the bonds between the
particles.
The change in state from liquid to gas is called
vaporization
sublimation
condensation
deposition
The rate of evaporation is affected by several factors. Which statement describes one of the factors appropriately?
Higher air humidity increases the rate of evaporation.
A smaller exposed area increases the rate of evaporation.
A lower surrounding temperature increases the rate of evaporation.
A higher altitude (height above sea level) increases the rate of evaporation.
The SI units J/kg°C measures
Specific heat capacity
mass
temperature
heat energy
Define Specific Latent Heat of Fusion
is the amount of thermal energy required to change one kilograms of the substance from liquid state to gaseous state or vice versa, without a change in temperature
is the amount of thermal energy required to change one kilograms of the substance from solid state to liquid state or vice versa, without a change in temperature
is the amount of thermal energy required to change one kilograms of the substance from liquid state to gaseous state or vice versa by one Kelvin or one degree celcius
is the amount of thermal energy required to change the substance of any of any mass from liquid state to solid state or vice versa, without a change in temperature
A high specific heat capacity means...
It heats up quickly with energy added
It requires more energy to change temperature
The increase in temperature when heat is supplied to a body can be explained by
an increase in the average kinetic energy of the particles in the body.
an increase in the average spacing of the particles in the body.
a decrease in the average speeds of the particles in the body.
a decrease in the internal energy of the particles in the body.
The specific heat(c) of copper is 0.39 J/g °C. What is the temperature change (∆t) when 100 Joules of heat (∆E) is added to 20 grams?
12.82 °C
24.12°C
1.95 °C
5128 °C
The specific heat of platinum is 0.133 J/g°C. How much heat (∆E) is released when a 10 g piece of platinum cools from 100°C to 50°C?
66.5 J
665 J
0.0266 J
0.665 J
The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0 °C to 35.0 °C when the metal absorbs 350.0 J of energy. What is the specific heat capacity of the metal?
1.17 J/g°C
-1.17 J/g°C
0.857 J/g°C
-0.857 J/g°C
How much energy is released when you freeze 150 g of water?
( Lvaporisation=2260 J/g and LFusion =334 J/g)
50 100 cal
339 000 J
339 000 cal
50 100 J
A 2.00 kg block of iron has an immersion heater and a thermometer inserted into its body as an experimental set-up for determining the specific heat capacity of iron. The iron block is also well lagged with an insulator.
The heater is set at 100 W. The initial temperature of the iron block is 25°C. After two minutes, its temperature is measured to be 38°C. What is the specific heat capacity of iron?
7.7 J kg–1 °C –1
160 J kg–1 °C –1
240 J kg–1 °C –1
462 J kg–1 °C –1
