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- 1. Multiple Choice
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
- 2. Multiple Choice
This symbol represents specific heat
Q
c
ΔT
L
- 3. Multiple Choice
This symbol represents latent heat
Q
c
ΔT
L
- 4. Multiple Choice
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)
- 5. Multiple Choice
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
- 6. Multiple Choice
There are four main processes in changing of phase, and they are
Melting
Boiling
Condensation
All the above
- 7. Multiple Choice
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
- 8. Multiple Choice
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
- 9. Multiple Choice
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
- 10. Multiple Choice
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
- 11. Multiple Choice
What is the formula to calculate specific latent heat of vaporisation?
L = Q/m
c = Q/(mΔƟ)
Q = mcΔƟ
Q = mL
- 12. Multiple Choice
Water molecules have the greatest kinetic energy in
Ice at 0 ⁰C
Water at 90 ⁰C
Water at 373 K
Steam at 150 ⁰C
- 13. Multiple Choice
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
- 14. Multiple Choice
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.
- 15. Multiple Choice
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 J/kg )
16.1 X J
16.8 X J
15.1 X cal
16.8 X cal
- 16. Multiple Choice
How much energy is required to melt down a 2000 g of mercury?(latent heat of fusion is 1.14 x J/kg)
2.55 x J
2.28 x J
2,280 x J
3.28 x J
- 17. Multiple Choice
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
- 18. Multiple Choice
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
- 19. Multiple Choice
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 )
Q = 5.9 X J
M = 5.9 X J
C = 5.9 X J
T = 5.9 X J
- 20. Multiple ChoiceThe graph shows the cooling curve of a substance.
The specific latent heat released at stages?CD and FGDE and EFEF and FGDE and FG - 21. Multiple ChoiceWater boils at 100°C and freezes at 0°C.
What happens to the boiling point and the freezing point when salt is added to the water?The boiling point and the freezing point remain unchangedBoth the boiling point and the freezing point increasesThe boiling point increases and the freezing point decreasesBoth the boiling point and the freezing point decreases - 22. Multiple ChoiceWhat is the latent heat of fusion for water?It is the heat absorbed by 1 kg of water to increase the temperature by 1 °CIt is the heat absorbed by 1 kg of ice during melting without changes in temperatureIt is the heat absorbed by 1 m3 of ice during melting without changes in temperatureIt is the heat absorbed by 1 m3 of ice during melting to decrease the temperature by 1 °C
- 23. Multiple ChoiceAn 63 W immersion heater is switched on and put into the ice cubes in B.
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]60.0 g15.0 g45.0 g30.0 g - 24. Multiple ChoiceAn ice machine removes heat at the rate of 4.5 kW. How long does it takes to freeze 4 kg of water at the temperature 14°C?
[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]52 s4 min 6 s4 min 59 s5 min 51 s - 25. Multiple ChoiceSteam at temperature of 100°C is piped to 3 kg of water at the temperature of 5°C until the water reaches the boiling point. The mass of the steam required is
[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]0.26 kg0.53 kg0.94 kg1.89 kg - Answer choicesTagsAnswer choicesTags