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WorksheetsSpecific Heat and Latent Heat
Total questions: 25
Worksheet time: 1hrs 4mins
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 symbol represents specific heat
Q
c
ΔT
L
This symbol represents latent heat
Q
c
ΔT
L
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)
How much energy is required to freeze 150 g of water? ( LV=2260 and LF=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
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
What is the formula to calculate specific latent heat of vaporisation?
L = Q/m
c = Q/(mΔƟ)
Q = mcΔƟ
Q = mL
Water molecules have the greatest kinetic energy in
Ice at 0 ⁰C
Water at 90 ⁰C
Water at 373 K
Steam at 150 ⁰C
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
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
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
6.78 x 106 J of heat is removed from a mass of steam to produce water. What is the mass of water produced?
3 g
9.8 kg
12 g
3 kg
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 Δ 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?
After 4 minutes, the mass of the water in beaker A is 15 g. What is the mass of the water in beaker B?
[Specific latent heat of fusion of ice = 3.36 × 105 J kg−1]
[Specific latent heat of fusion of ice = 3.36 × 105 J kg−1, specific heat capacity of water = 4.2 × 103 J kg−1°C−1]
[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]
