To change to Kelvin, 0oC + 273 = -20 + 273 = 253 K
johnmulu answered the question on February 18, 2017 at 08:29
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A house in which a cylinder containing cooking gas is kept unfortunately catches fire. The cylinder explodes. Give an explanation for the explosion.
(Solved)
A house in which a cylinder containing cooking gas is kept unfortunately catches fire. The cylinder explodes. Give an explanation for the explosion.
Date posted:
February 18, 2017
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Answers (1)
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In an experiment to determine the specific latent of vapourization of water, steam of mass 10 g at 100o ...
(Solved)
In an experiment to determine the specific latent of vapourization of water, steam of mass 10 g at 100o is passed into 100 g of water initially at 20oC in a container of negligible heat capacity. The temperature of the water rises to 70oC.
(Take the specific heat capacity of water as 4.2 x 103J Kg-1 and boiling point of water as 100oC)
i) Determine the specific latent heat of vapourization of water
ii) State two sources of error in this experiment.
Date posted:
February 18, 2017
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Answers (1)
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Define the term specific latent heat of fusion.
(Solved)
State the meaning of the term "specific latent heat of fusion."
Date posted:
February 18, 2017
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Answers (1)
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State why it is necessary to leave an air space in a closed glass bottle of water when it is to be kept in a refrigerator
(Solved)
State why it is necessary to leave an air space in a closed glass bottle of water when it is to be kept in a refrigerator.
Date posted:
February 18, 2017
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Answers (1)
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When temperature of water reaches its boiling point, bubbles rise to the surface....
(Solved)
When temperature of water reaches its boiling point, bubbles rise to the surface
i) State what is contained in the bubbles
ii) State the reason why bubbles rise to the surface only at the boiling point.
Date posted:
February 18, 2017
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Answers (1)
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Why it is advisable to use a pressure cooker for cooking at high altitudes
(Solved)
Explain why it is advisable to use a pressure cooker for cooking at high altitudes
Date posted:
February 18, 2017
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Answers (1)
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State two factors that affect the boiling point of a liquid.
(Solved)
Name two factors that affect the boiling point of a liquid.
Date posted:
February 18, 2017
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Answers (1)
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Define the term heat capacity
(Solved)
Define the term heat capacity
Date posted:
February 18, 2017
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Answers (1)
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Water is known to boil at 100oC. A student heated some water and noticed that it boiled at 101oC. State two possible reasons for this observation.
(Solved)
Water is known to boil at 100oC. A student heated some water and noticed that it boiled at 101oC. State two possible reasons for this observation.
Date posted:
February 18, 2017
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Answers (1)
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Stat two factors that affect the melting point of ice
(Solved)
Stat two factors that affect the melting point of ice.
Date posted:
February 18, 2017
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Answers (1)
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What is meant by specific latent heat of fusion of a substance?
(Solved)
Define specific latent heat of fusion of a substance.
Date posted:
February 18, 2017
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Answers (1)
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Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
(Solved)
Explain why a drop of methylated spirit on the back of the hand feels colder than a drop of water at the same temperature.
Date posted:
February 15, 2017
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Answers (1)
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What is meant by 'Specific latent heat of vaporazation'.
(Solved)
State what is meant by the term 'Specific latent heat of vaporazation'.
Date posted:
February 15, 2017
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Answers (1)
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State two factors that would raise the boiling point of water to above 100oC
(Solved)
State two factors that would raise the boiling point of water to above 100oC
Date posted:
February 15, 2017
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Answers (1)
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Water of mass 3 kg, at a temperature of 90oC is allowed to cool for 10 minutes. state two factors that determine the final temperature.
(Solved)
Water of mass 3 kg, at a temperature of 90oC is allowed to cool for 10 minutes. State two factors, other than humidity, that determine the final temperature.
Date posted:
February 15, 2017
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Answers (1)
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Ice changes to water at 0oC. Equal masses of the ice and water at 0oC are each heated to 1oC. Give a reason why more heat energy is required to heat the ice
(Solved)
Ice changes to water at 0oC. Equal masses of the ice and water at 0oC are each heated to 1oC. Give a reason why more heat energy is required to heat the ice.
Date posted:
February 15, 2017
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Answers (1)
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Describe the experiment to determine the specific heat capacity, c, of a block of aluminium with two holes drilled in it
(Solved)
Describe the experiment to determine the specific heat capacity, c, of a block of aluminium with two holes drilled in it, to accommodate a thermometer and an electric immersion heater.
Date posted:
February 15, 2017
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Answers (1)
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Distinguish between heat capacity and specific heat capacity of a body
(Solved)
Distinguish between heat capacity and specific heat capacity of a body.
Date posted:
February 15, 2017
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Answers (1)
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A 4 ohm resistor is connected in series to a battery of e.m.f. 6 V and negligible internal resistance. Determine the power dissipated by the resistor.
(Solved)
A 4 ohm resistor is connected in series to a battery of e.m.f. 6 V and negligible internal resistance. Determine the power dissipated by the resistor.
Date posted:
February 15, 2017
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Answers (1)
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A current I flowing through a wire of resistance R was increased seven times. Determine the factor by which the rate of heat production was increased.
(Solved)
A current I flowing through a wire of resistance R was increased seven times. Determine the factor by which the rate of heat production was increased.
Date posted:
February 15, 2017
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Answers (1)