Chemistry
State how hydrogen occurs in the free state.
Name three compounds containing hydrogen in the combined state.
Hydrogen
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Answer
In Free state:
- In traces : Hydrogen occurs in minute traces in the earth's crust, atmosphere & in volcanic gases
- In & around the sun : Hydrogen occurs in the interior of the sun which consists mainly of hydrogen, which is converted to energy released as heat & light.
The compounds containing hydrogen are: ammonia (NH3), hydrochloric acid (HCl), water(H2O)
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(c) An alkali
[Give balanced equations for each & name the product formed in each case other than hydrogen].
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(a) The meaning of the term 'electrolysis' & 'electrolyte'.
(b) Name the electrode:
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In the laboratory preparation of hydrogen from zinc & dilute hydrochloric acid - state a reason for
(a) Addition of traces of copper [II] sulphate to the reaction medium.
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(c) Having the end of the thistle funnel dip below the level of the acid in the flask.
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(b) The reason for use of addition of a promoter to the catalyst in the final step.
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