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Breath paper AS Chemistry H032_01 (100%)Verified Solutions 2024.
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Breath paper AS Chemistry H032_01 (100%)Verified Solutions 2024.
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Breath paper AS Chemistry H032/01(100%)Verified Solutions 2024
Describe how HCl is removed from the waste gases produced - ANS-HCl gas is passed
through alkali (carbonate)
what do the experimental results tell you about the carbon-halogen bond enthalpies -
ANS-bond enthalpy decreases down group 7
c-cl>c-br>c-i
How could the student modify their experiment so that it could be completed in less time
- ANS-heat test tubes in a water bath
general formula for an alkyl group - ANS-CnH2n+1
Compound H can be prepared in an elimination reaction by heating compound J with an
acid catalyst
A student carries out this preparation using 7.65g of compound J.
The student obtains 2.05g of compound H
write and equation for this reaction using molecular formulae.
calculate percentage yield of compound H
c6h10
c6h12o - ANS-C6H10
72+10=82 mr
mol= 2.05/82=0.025
C6H12O
84+16=100 mr
mol= 7.65/100= 0.0765mol
0.025/0.0765 x100 = 32.7%
Europium reacts with dilute sulphuric acid, forming a solution of europium sulphate and
hydrogen gas
a chemist reacts 0.608g of europium with an excess of H2SO4(aq) and collects 144cm3
of hydrogen gas at room temperature and pressure
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