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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)  

1.5 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?

  1.30 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

1.6 The electronic structures of atoms P and Q are shown. (1)   Right-click on the button to open the data booklet in a new tab.        P and Q react to for an ionic compound. What is the formula of the compound?   Right-click on the button to open the data booklet in a new tab.       

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?

1.15   The diagram shows an outline of part of the Periodic Table. (1)   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?

1.4 Which atom has twice as many neutrons as protons? (1)   Right-click on the button to open the data booklet in a new tab.       

 1.10 The diagram shows that two gases are formed when concentrated hydrochloric acid is electrolysed using inert electrodes. (1)   Right-click on the button to open the data booklet in a new tab.        Which row correctly describes the colours of the gases at the electrodes?   anode (+ve) cathode (–ve) A colourless colourless B colourless yellow-green C yellow-green colourless D yellow-green yellow-green

1.3 Element Y has 10 protons.   Element Z has 11 protons. Which statement is correct? (1)

 1.18 Five elements have proton numbers 10, 12, 14, 16 and 18. What are the proton numbers of the three elements that form oxides? (1)