Q11 of 270 Page 66

Name one animal and one plant whose stings contain formic acid (or methanoic acid).

Animal- Some of ant species.

Plant- Secretions from stinging nettles.




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9 Give the names and formulae of two strong acids and two weak acids. 10 Name one natural source of each of the following acids:

(a) Citric acid (b) Oxalic acid


(c) Lactic acid (d) Tartaric acid

 12 How is the concentration of hydronium ions (H3O+) affected when the solution of an acid is diluted? 13 Write word equations and then balanced equations for the reactions taking place when:

(a) dilutesulphuric acid reacts with zinc granules.


(b) dilute hydrochloric acid reacts with magnesium ribbon.


(c) dilutesulphuric acid reacts with aluminium powder.


(d) dilute hydrochloric acid reacts with iron fillings.