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WorksheetsF4 Chp 4.2 Specific Latent Heat
Total questions: 28
Worksheet time: 2hrs 30mins
Name
Class
Date
1.
How many Joules of energy are required to change 10 gram of ice at -2 οC to water at 20 οC?
a)
440 J
b)
880 J
c)
3,840 J
d)
66,000 J
2.
How many Joules of energy are required to change 10 gram of water from 20 οC to 90 οC?
a)
1400 J
b)
2800 J
c)
210,000 J
d)
1,400,000 J
3.
How many Joules of energy are required to make 100 grams of ice at 0 οC completely melt?
a)
200 J
b)
400 J
c)
30,000 J
d)
2,000,000 J
4.
The symbol for specific heat is .......
a)
c
b)
Q
c)
m
d)
t
5.
If 200 grams of water is to be heated from 24.0 οC to 100.0 οC to make a cup of tea, what is the mass and what is the change in temperature?
a)
m=200g
∆θ= 66
∆θ= 66
b)
m=200g
∆θ=124
∆θ=124
c)
m=200
∆θ=100
∆θ=100
d)
m=200g
∆θ=76
∆θ=76
6.
What is the formula to calculate heat energy required to raise the temperature of any substance?
a)
Q=mc∆θ
b)
Q=mc
c)
Q= ½mv
d)
m=QC
7.
20 g of water. specific heat of water is 4.18 J g-1 °C-1. temperature changes from 25 °C to 20 °C, how much heat energy (Q) moves from the water to the surroundings?
a)
418 Joules
b)
209 J
c)
83 J
d)
4.18 J
8.
Specific heat of water is 4.18 J g-1 °C-1. Specific heat of wood is 1.760 J g-1 °C-1 What material needs more heat energy to raise the temperature?
a)
Water
b)
Wood
c)
Both are same
9.
Water molecules have the greatest kinetic energy in
________________
________________
a)
Ice at 0 °C.
b)
Water at 373 K.
c)
Water at 98 °C
d)
Steam at 150 °C.
10.
The unit Joules is for ___________
a)
heat energy
b)
temperature
c)
specific heat
11.
Does everything have Specific Heat?
a)
I give up!
b)
no
c)
yes
12.
A high specific heat means...
a)
It heats up quickly with energy added
b)
It requires more energy to change temperature
13.
What is Specific Heat?
a)
The amount of thermal energy required to increase the temperature of 1kg of a material by 1°C.
b)
The amount of radiant energy required to increase the temperature of 1kgof a material by 1°C
c)
The amount of energy required to increase the temperature of 1kgof a material by 1°C.
d)
The amount of friction required to increase the temperature of 1kgof a material by 1°C.
14.
For a skillet, used for cooking, do you want a high or low specific heat
a)
High, so that it will need more energy to heat up
b)
Low, so that it will change temperature quickly
15.
Compared to metal, water seems to have a ___________ specific heat.
a)
High, it takes a lot of energy to heat up and change temperature
b)
Low, because it does not require a lot of energy to change temperature
16.
In what direction to cold liquids and gasses move?
a)
Side to Side
b)
Up
c)
Down
d)
Back and Forth
17.
In what direction do hot liquids and gasses move?
a)
Side to Side
b)
Down
c)
Up
d)
Back and Forth
18.
The graph shows the cooling curve of a substance.
The specific latent heat released at stages?
The specific latent heat released at stages?
a)
CD and FG
b)
DE and EF
c)
EF and FG
d)
DE and FG
19.
A metal cube at temperature of 10°C immersed in a liquid at temperature of 70°C.
What is the temperature of the metal cube when thermal equilibrium is achieved between the cube and the liquid?
What is the temperature of the metal cube when thermal equilibrium is achieved between the cube and the liquid?
a)
Between 10°C and 70°C
b)
More than 70°C
c)
Less than 10°C
d)
Same as the room temperature
20.
Water 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?
What happens to the boiling point and the freezing point when salt is added to the water?
a)
The boiling point and the freezing point remain unchanged
b)
Both the boiling point and the freezing point increases
c)
The boiling point increases and the freezing point decreases
d)
Both the boiling point and the freezing point decreases
21.
What is the latent heat of fusion for water?
a)
It is the heat absorbed by 1 kg of water to increase the temperature by 1 °C
b)
It is the heat absorbed by 1 kg of ice during melting without changes in temperature
c)
It is the heat absorbed by 1 m3 of ice during melting without changes in temperature
d)
It is the heat absorbed by 1 m3 of ice during melting to decrease the temperature by 1 °C
22.
The hot water is added to the cold water.
Which of the following statements is correct if there are no heat losses to the surrounding?
Which of the following statements is correct if there are no heat losses to the surrounding?
a)
The heat gained by the cold water is greater than the heat lost by the hot water
b)
The heat gained by the cold water is equal to the heat lost by the hot water
c)
The heat lost by the hot water is less than the heat gained by the cold water
d)
The heat gained by the cold water is less than the heat lost by the hot water
23.
Two objects, V and W, touching each other. The initial temperature of V and W are 90°C and 80°C respectively.
Which statement is correct when V and W are at thermal equilibrium?
Which statement is correct when V and W are at thermal equilibrium?
a)
Net rate of heat flow between V and W is zero
b)
Rate of change in temperature of V is bigger then that of W
c)
Temperature of V is higher than W
d)
The quantity of heat in V is the same as in W
24.
What is the concept used in the measurement of temperature using a thermometer?
a)
Specific heat capacity
b)
Thermal equilibrium
c)
Thermal convection
d)
Thermal resistance
25.
Both blocks have the same mass and heated with the same amount of heat energy in 40 minutes.
Which statement is correct at the end of 40 minutes?
Which statement is correct at the end of 40 minutes?
a)
The graphite block has the lowest final temperature
b)
The final temperature of the graphite block is lower than sodium block
c)
The final temperature of the graphite block is higher than sodium block
d)
The sodium block has the highest final temperature
26.
An 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]
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]
a)
60.0 g
b)
15.0 g
c)
45.0 g
d)
30.0 g
27.
An 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]
[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]
a)
52 s
b)
4 min 6 s
c)
4 min 59 s
d)
5 min 51 s
28.
Steam 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]
[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]
a)
0.26 kg
b)
0.53 kg
c)
0.94 kg
d)
1.89 kg
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