QUESTION 9 This apparatus is used to electrolyse…
QUESTION 9 This apparatus is used to electrolyse a concentrated solution of sodium chloride. Right-click on the button to open the data booklet in a new tab. The ionic half-equations for the reactions at the electrodes are negative electrode 2H2O(l) + 2e−
Read Details10.6 The diagram shows an outline of part of the Periodic…
10.6 The diagram shows an outline of part of the Periodic Table. Right-click on the button to open the data booklet in a new tab. Which statement about elements X, Y and Z is not correct? A All react with oxygen. B All conduct electricity. C All are metals. D All form coloured compounds. [1]
Read DetailsQUESTION 8 The pie chart shows the relative amou…
QUESTION 8 The pie chart shows the relative amounts of some gases in air. Right-click on the button to open the data booklet in a new tab. 8.1 Name of the gas that makes up most of the air. (1) 8.2 What is the approximate percentage of oxygen in air? (1) Rain water is naturally slightly acidic because carbon dioxide dissolves in it. The word equation for the reaction that occurs is: carbon dioxide + water
Read Details