(a) Identify the student who had used an illegal drug (1 mark) (b) Which drug is less soluble in methanol (1 mark) 4. Using dots (.) and crosses (x) to represent electrons, show bonding in the compounds formed when the following elements react ( Si = 14, Na = 11 and Cl = 17) (a) Sodium and chlorine (1 mark) (b) Silicon and chlorine (1 mark) 5. Zinc oxide reacts with acids and alkalis. (a) Write the equation for the reaction between zinc oxide and; (i) Dilute sulphuric acid (1 mark) Sodium hydroxide solution (ii) (1 mark) (b) What property of zinc oxide is shown by the reaction in (a) above (1 mark) Use the information in the table below to answer the questions that follow. (The letters do not represent 6. the actual symbol of the elements) Element A B C D E Atomic number 18 5 3 5 20 Mass number 40 10 7 11 40
(a) Identify the student who had used an illegal drug (1 mark) (b) Which drug is less soluble in methanol (1 mark) 4. Using dots (.) and crosses (x) to represent electrons, show bonding in the compounds formed when the following elements react ( Si = 14, Na = 11 and Cl = 17) (a) Sodium and chlorine (1 mark) (b) Silicon and chlorine (1 mark) 5. Zinc oxide reacts with acids and alkalis. (a) Write the equation for the reaction between zinc oxide and; (i) Dilute sulphuric acid (1 mark) (ii) Sodium hydroxide solution (1 mark) (b) What property of zinc oxide is shown by the reaction in (a) above (1 mark) 6. Use the information in the table below to answer the questions that follow. (The letters do not represent the actual symbol of the elements) Element A B C D E Atomic number 18 5 3 5 20 Mass number 40 10 7 11 40
42784-chemistry.docx