Glass is a bad conductor of heat. The difference in temperature between the inside and the outside of the thick glass causes unequal expansion while for a thin glass there is equal distribution of heat thus equal expansion
johnmulu answered the question on February 6, 2017 at 09:30
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Give a reason why a concrete beam reinforced with steel does not crack when subjected to changes in temperature
(Solved)
Give a reason why a concrete beam reinforced with steel does not crack when subjected to changes in temperature.
Date posted:
February 6, 2017
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Answers (1)
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One property of a liquid that is considered while constructing a liquid-in-glass thermometer is that the liquid expands more than the glass for the same temperature change
(Solved)
One property of a liquid that is considered while constructing a liquid-in-glass thermometer is that the liquid expands more than the glass for the same temperature change. State any other two properties of the liquids that are considered.
Date posted:
February 6, 2017
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Answers (1)
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State why it is easier to separate water into drops than to separate a solid into smaller pieces
(Solved)
State why it is easier to separate water into drops than to separate a solid into smaller pieces
Date posted:
February 6, 2017
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Answers (1)
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In a smoke cell experiment to demonstrate Brownian motion, smoke particles are seen moving randomly. State the cause of the randomness
(Solved)
In a smoke cell experiment to demonstrate Brownian motion, smoke particles are seen moving randomly. State the cause of the randomness
Date posted:
February 6, 2017
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Answers (1)
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A drop of blue ink is introduced at the bottom of a beaker containing water. It is observed that after sometime, all water in the beaker turns blue
(Solved)
A drop of blue ink is introduced at the bottom of a beaker containing water. It is observed that after sometime, all water in the beaker turns blue. Name the process that takes place.
Date posted:
February 6, 2017
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Answers (1)
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A bottle containing a smelling gas is opened at the front bench of a classroom. State the reason why the gas is detected throughout the room
(Solved)
A bottle containing a smelling gas is opened at the front bench of a classroom. State the reason why the gas is detected throughout the room.
Date posted:
February 6, 2017
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Answers (1)
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State the reason why it is easier to separate water into drops than to separate a solid into smaller pieces
(Solved)
State the reason why it is easier to separate water into drops than to separate a solid into smaller pieces
Date posted:
February 6, 2017
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Answers (1)
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Two identical beakers A and B containing equal volumes of water are placed on a bench. The water in A is cold while in B it is warm
(Solved)
Two identical beakers A and B containing equal volumes of water are placed on a bench. The water in A is cold while in B it is warm. Identical pieces of potassium permanganate are placed gently at the bottom of each beaker inside the water. It is observed that the spread of colour in B is faster than in A. Explain this observation
Date posted:
February 6, 2017
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Answers (1)
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Explain the difference between a liquid and a gas in terms of intermolecular distances and forces
(Solved)
Explain the difference between a liquid and a gas in terms of intermolecular distances and forces.
Date posted:
February 6, 2017
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Answers (1)
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Distinguish between solid and liquid states of matter in terms of intermolecular forces
(Solved)
Distinguish between solid and liquid states of matter in terms of intermolecular forces.
Date posted:
February 6, 2017
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Answers (1)
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Two identical tubes A and B held horizontally contain air and water respectively. A small quantity of coloured gas is introduced at one end of A
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Two identical tubes A and B held horizontally contain air and water respectively. A small quantity of coloured gas is introduced at one end of A while a small quantity of coloured water is introduced at one end of B. State with reason the tube in which the colour will reach the other end faster.
Date posted:
February 6, 2017
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Answers (1)
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Explain the cause of random motion of smoke particles as observed in Brownian motion experiment using a smoke cell
(Solved)
Explain the cause of random motion of smoke particles as observed in Brownian motion experiment using a smoke cell.
Date posted:
February 6, 2017
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Answers (1)
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Small quantities of hydrogen and helium gas at the same temperature are released simultaneously at one end of a laboratory
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Small quantities of hydrogen and helium gas at the same temperature are released simultaneously at one end of a laboratory. State with reason which gas is more likely to be detected at the other end.
Date posted:
February 6, 2017
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Answers (1)
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State the reason why gases are easily compressible while liquids and solids are not
(Solved)
State the reason why gases are easily compressible while liquids and solids are not
Date posted:
February 6, 2017
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Answers (1)
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In the Brownian motion experiment, smoke particles are observed to move randomly
(Solved)
In the Brownian motion experiment, smoke particles are observed to move randomly. Explain how this motion is caused.
Date posted:
February 6, 2017
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Answers (1)
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A balloon is filled with hydrogen gas and then released into the air. It is observed that as it rises higher into the air it expands
(Solved)
A balloon is filled with hydrogen gas and then released into the air. It is observed that as it rises higher into the air it expands. Explain why it expands
Date posted:
February 6, 2017
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Answers (1)
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A student wearing sharp pointed heeled shoes is likely to damage a soft wooden floor
(Solved)
A student wearing sharp pointed heeled shoes is likely to damage a soft wooden floor. Explain
Date posted:
February 6, 2017
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Answers (1)
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State two factors that determine the pressure at a point in a liquid
(Solved)
State two factors that determine the pressure at a point in a liquid.
Date posted:
February 6, 2017
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Answers (1)
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Explain why brakes fail in a hydraulic breaking system when air gets into the system
(Solved)
Explain why brakes fail in a hydraulic breaking system when air gets into the system.
Date posted:
February 6, 2017
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Answers (1)
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In an experiment to demonstrate atmospheric pressure, a plastic bottle is partially filled with hot water and the bottle is then tightly corked
(Solved)
In an experiment to demonstrate atmospheric pressure, a plastic bottle is partially filled with hot water and the bottle is then tightly corked. After some time the bottle starts to get deformed.
i) State the purpose of the hot water
ii) State the reason why the bottle gets deformed
iii) Explain your answer in (ii)
Date posted:
February 6, 2017
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Answers (1)