State the word equation for photosynthesis, carbon dioxide + water → glucose + oxygen

State the symbol equation for the conversion of sulfur dioxide to sulfur trioxide in the Contact process, (2SO_2(g) + O_2(g) ightleftharpoons 2SO_3(g))

Describe the neutralisation reaction between an acid and an alkali to produce water, ( H^+(aq) + OH^- (aq) ightarrow H_2O (l) )