1Which of the everyday materials shown are likely to have acidic properties?
2Make a list of the sour foods you have eaten. Why are those foods sour?
3Match each acid with the place it is found: formic acid, oxalic acid, citric acid, hydrochloric acid, acetic acid, lactic acid, carbonic acid.
4Hydrochloric acid is found in the human stomach. Is hydrochloric acid organic or inorganic, and why?
5What happens when magnesium ribbon is put into dilute hydrochloric acid? Why does a pop sound come when a burning matchstick is brought near?
6Why do bubbles come out of the test tube when dilute hydrochloric acid is added to calcium carbonate? What happens when that colourless gas is passed into lime water?
7After the acid and base mixture in the porcelain basin is heated, what is left behind? What is this reaction called?
8Pieces of radish or carrot are kept dry in one bottle and covered with vinegar in another for one week to 15 days. What change comes, and why?
9Define an acid and write any three of its physical properties.
10Write the difference between a strong acid and a weak acid, with examples.
11What is produced when an acid reacts with a metal, with a metal carbonate and with a base? Write the equations.
12Write the uses of sulphuric acid and of nitric acid.
13Why does it matter, when testing for an acid, that an acid changes neither red litmus nor phenolphthalein?