(a)[1]
What does the symbol $\rightleftharpoons$ mean?
(b)[1]
Would you describe this reaction as exothermic or endothermic? Support your choice with a reason.
(c(i))[1]
Describe how the percentage yield of sulfur trioxide varies with temperature.
(c(ii))[1]
Find the percentage yield of sulfur trioxide at $500\,^{\circ}\text{C}$.
(d)[2]
Describe a test for sulfur dioxide. Give both the test and the result.
(e)[1]
Give one use of sulfur dioxide.
(f)[2]
Which substance is reduced in this reaction? Explain your response.
(g)[1]
Complete the chemical equation for this reaction. $\text{H}_2\text{SO}_3 + 2\text{H}_2\text{S} \rightarrow .....\text{H}_2\text{O} + 3\text{S}$