Chemistry
- Created by: Mols
- Created on: 06-09-12 19:52
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Laboratory preparation of hydrogen
how to make hydrogen: react zinc with dilute sulphuric acid.
First tubes of gas discarded by displaced air
metal+acid= salt+ hydrogen
zinc+ sulphuric acid -> zinc sulphate and hydrogen
Zn(s)+H2S04 -> ZnSO4 (aq) +H2 (g)
Test for hydrogen
when mixed with air and then ignited hydrogen will explode with a squeaky pop
You can collect hydrogen
over water
by downward delivery
upward displacement of air
why collected this way
1. Its insoluble in water
2. hydrogen is less dense than air
Preparation of oxygen
Made by reacting hydrogen peroxide with maganese dioxide
collect over water
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