a) State three physical properties that distinguish metals from non-metals. (3 marks) b) The following metals are listed in order of their reactivity: Potassium (K), Calcium (Ca), Zinc (Zn), Iron (Fe), Copper (Cu). i) Which of these metals would react most vigorously with cold water? Write a balanced chemical equation for the reaction. (3 marks) ii) State what you would observe when zinc is added to dilute hydrochloric acid and write a balanced chemical equation for the reaction. (3 marks) iii) Explain why copper does not react with dilute hydrochloric acid. (1 mark) c) i) Name two non-metals that exhibit allotropy and state one allotrope of each. (2 marks) ii) State one industrial use each of the following non-metals: chlorine, sulphur. (2 marks) iii) Explain why graphite, a non-metal, is able to conduct electricity. (1 mark)