Bromine particles are almost twice as heavy as chlorine particles. Which gas will diffuse faster; bromine (vapour) or chorine? Explain your answer.

Chlorine particles will diffuse faster than bromine particles. This is because lighter molecules diffuse faster than heavier molecules.

Bromine particles are almost twice as heavy as chlorine particles…

Which cell organelle is concerned with cell secretions?

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What name is given to the amount of substance containing this number of atoms?

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Name three castes of honey bee farnily.

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Name these force:
The force which stops you falling through the floor.

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Which particular atom of the above element is used for this purpose?

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Name the physical quantity obtained by dividing ‘Distance travelled’ by ‘Time taken’ to travel that distance.

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Name two diseases against which infants below one year are vaccinated.

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Name the species of honey bee, which is used for commercial production of honey.

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If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?

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Give name of one improved crossbreed cows.

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