When a jar of air is put upside down on a gas jar of bromine vapours, the bromine vapours go up. Which gas is heavier?
Is wood an example of sublimation?

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Solution

Bromine is heavier than air.
Burning wood does not involve sublimation. Sublimation changes solid directly to gas.

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Q. When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment :
(a) air is heavier than bromine
(b) both air and bromine have the same density
(c) bromine is heavier than air
(d) bromine cannot be heavier than air because it is going upwards against gravity

Q. When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment

When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?

(a) bromine vapour is made of tiny paricles which are moving

(b) air is made up of tiny particles which are moving

(d) even though bromine vapour is heavier than air, it can move up against gravity

Q. When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?
(a) bromine vapour is made of tiny particles which are moving
(b) air is made up of tiny particles which are moving
(c) the particles of bromine are moving but those of air are not moving
(d) even though bromine vapour is heavier that air, it can move up against gravity

Q. A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.

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When a jar of air is put upside down on a gas jar of bromine vapours, the bromine vapours go up. Which gas is heavier? Is wood an example of sublimation?

Bromine is heavier than air. Burning wood does not involve sublimation. Sublimation changes solid directly to gas.

When a jar of air is put upside down on a gas jar of bromine vapours, the bromine vapours go up. Which gas is heavier?
Is wood an example of sublimation?

Bromine is heavier than air.
Burning wood does not involve sublimation. Sublimation changes solid directly to gas.