1.33 What are the ionic half-equations for the electrode reactions during the electrolysis of concentrated aqueous sodium chloride?   (1)   Right-click on the button to open the data booklet in a new tab.       

1.22  Water for human use is treated by filtration then chlorination. Which uses do not need water of this quality?   1 water for cooling in industry 2 water for flushing toilets in the home 3 water for drinking   (1)

1.13 Aqueous potassium iodide is added to aqueous silver nitrate. What are the colours of the final precipitate and solution? (1)

1.39 Which physical property is used to separate the nitrogen and oxygen from air? (1)

1.20  Many metals are extracted from their ores by heating the metal oxide with carbon. Which metal cannot be extracted using this method? (1)  

1.11 The diagram shows the reaction between zinc oxide and dilute hydrochloric acid. (1)   Right-click on the button to open the data booklet in a new tab.        Which terms describe the reaction?   Endothermic Neutralization A Yes Yes B Yes No C No Yes D No No

1.26  A covalent molecule M contains four shared pairs of electrons. What is M?   A hydrogen chloride, HCl B methane, CH4 C ammonia, NH3 D water, H2O   (1)  

  1.30 A method used to investigate the rate of reaction of calcium carbonate with dilute hydrochloric acid under different conditions is shown.   ● Place 50 cm3 of dilute hydrochloric acid in a conical flask. ● Add a known volume of water to the conical flask. ● Heat the conical flask to the required temperature. ● Add 1.0 g of calcium carbonate to the conical flask. ● Measure the time taken for the reaction to finish.   Which volume of water and which temperature gives the shortest time taken for the reaction to finish?   (1)     volume of water added / cm3 temperature / °C A 10 30 B 10 50 C 40 30 D 40 50

1.5 The table contains information about four substances. (1)     Melting point in degree Celsius Electrical conductivity     When molten In aqueous solution A 13 No Yes B 99 Yes Yes C 790 Yes Yes D 1500 No insoluble   Which substance is Potassium Chloride?

1.7 The diagram shows an image of a diamond and graphite in no particular order. (1)   Right-click on the button to open the data booklet in a new tab.        What is true for the uses of P and Q based on their structures?