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WorksheetsSpecific Latent Heat
Total questions: 24
Worksheet time: 28mins
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 of 1 kg object
the heat absorbed or released by an object to increase or decrease its temperature by 1 degree Celcius
The heat absorbed by melting a solid is known as
latent heat of fusion
latent heat of solid
latent heat of liquid
latent heat of vaporisation
The amount of heat required to change the phase of a substance depends on two factors which are
surrounding temperature
temperature change
material
the mass
specific latent heat of vaporisation is
the amount of heat required to change 1 kg of the substance from the solid to liquid phase without change in temperature
the amount of heat required to change 1 kg of the substance from the liquid to gaseous phase without change in temperature
the amount of heat required to change the temperature 1 kg of the substance by 1 degree Celcius
the symbol for specific latent heat is
c
L
Q
m
Water molecules have the greatest kinetic energy in
Ice at 0 ⁰C
Water at 90 ⁰C
Water at 373 K
Steam at 150 ⁰C
It's the amount of heat required to change the state (gas,liquid, solid) of a unit of material
Latent Heat
Specific Heat
Temperature
Q
This formula is used to find the amount of heat (energy) neccesary when there's a phase change
Q= (h)(ΔT)
Q=(m)(L)
Q=(m)(c)(ΔT)
Q=(k)(A)(dT)
Which of the following best explains why the sand at the beach is hotter than the water?
Sand has a higher specific heat than water.
Sand has a lower specific heat than water.
There is more water than sand at the beach.
There is more sand than water at the beach.
How much energy is required to change 5 kg of ice at 0 ° C into water at the same temperature? (latent heat of fusion is 3.36 X 106 J/kg )
16.1 X 106 J
16.8 X 106 J
15.1 X 106 cal
16.8 X 106 cal
Calculate the amount of heat added to 15 kg gold to change phase from solid to liquid. (The heat of fusion for gold is 64500 J/kg)
967,500 calories
976, 500 Joules
967,500 Joules
976, 500 calories
How much energy is required to change 2600 g of water at 100 ° C into steam temperature? (latent heat of vaporization is 2.26 x 106 )
Q = 5.9 X 106 J
M = 5.9 X 106 J
C = 5.9 X 106 J
Δ T = 5.9 X 106 J
The specific latent heat released at stages?
What happens to the boiling point and the freezing point when salt is added to the water?
[Specific latent heat of vaporization of water = 2.26 × 106 J kg−1, specific heat capacity of water = 4.2 × 103 J kg−1°C−1]
How much energy is required to melt down a 2000 g of mercury?(latent heat of fusion is 1.14 x 104 J/kg)
2.55 x 104 J
2.28 x 104 J
2,280 x 104 J
3.28 x 104 J
In an experiment, a liquid is heated at a constant rate.
The temperature of the liquid increases and eventually becomes constant.
Which statement about the experiment is correct?
Boiling occurs at all temperatures but only on the liquid surface.
Boiling occurs throughout the liquid but only at the constant temperature.
Evaporation occurs throughout the liquid and at all temperatures.
Evaporation occurs only at the constant temperature and only on the liquid surface.
The diagram shows the changes of state P, Q, R and S that occur in solids, liquids and gases when they gain or lose thermal energy. What is the name of change R?
condensation
solidification
boiling
melting
Steam at 100 °C condenses to form water at 100 °C.
What happens to the average separation and what happens to the average speed of the water molecules?
A
B
C
D
When ice melts...
The mass of the water decreases during melting.
The mass of the water stays the same before, during and after melting.
The mass of the water is always changing.
The mass of the water increases during melting.
What unit do you use to measure specific latent heat?
J/Kg ºC
J/Kg
Kg
J
How much energy is required to freeze 150 g of water? ( LVapourisation=2260 and LFusion=334)
50 100 cal
339 000 J
339 000 cal
50 100 J
There are four main processes in changing of phase, and they are
Melting
Boiling
Condensation
All the above
