(a(i))[1]
What feature in the structure of fumaric acid shows that it is unsaturated?
(a(ii))[2]
Describe a test that can be used to identify an unsaturated compound. test ... result ...
(b(i))[1]
What does the term reduction mean?
(b(ii))[2]
Oxygen oxidises hydroiodic acid. Balance this chemical equation: ....HI + O$_2$ → 2H$_2$O + ....I$_2$
(b(iii))[1]
What percentage by volume of clean, dry air is oxygen?
(c)[4]
The concentration of a dilute acid may be found by reacting it with aqueous sodium hydroxide using the apparatus shown. What piece of apparatus should be used to add exactly 25.0 cm$^3$ of dilute acid to the conical flask? Explain why litmus solution is added to the conical flask. Describe the change in the colour of the litmus solution in the conical flask from ... to ...