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

  QUESTION 5 5.1 Most metals have a high melting point. State one other physical property that all metals have. 5.2 Iron often rusts. Name the two substances, other than iron, that must be present for iron to rust.     Iron can be obtained by heating iron (III) oxide with zinc powder. Fe2O3 + 3Zn —> 2Fe + 3ZnO   5.3 What can be deduced about the reactivity of zinc from this reaction? 5.4 The ionic equation for this reaction is shown. 2Fe3++ 3Zn — >2Fe + 3Zn2+   Identify the oxidising agent in this reaction. Explain your answer in terms of electron transfer.   oxidising agent …. explanation …   5.5 Zinc oxide is amphoteric. Describe two simple experiments to show that zinc oxide is amphoteric. Name the reagents you would use and describe the observations you would make. reagent 1 … observation … reagent 2 … observation ….        

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

  QUESTION 7   Insoluble salts can be made by precipitation reactions. A student mixed solutions of some soluble salts. The results the student obtained are shown in the table.   Right-click on the button to open the data booklet in a new tab.        All sodium salts are soluble in water. Use only results from the table to answer the following questions.   7.1 Write the chemical equation for the reaction in which silver carbonate is formed. 7.2 Name an insoluble cobalt salt. 7.3 Name an insoluble yellow lead salt.    

1.38 River water contains soluble impurities, insoluble impurities, and bacteria. River water is made safe to drink by filtration and chlorination. Which statement is correct?

1.34 Which is a chemical change?

  QUESTION 3 3.1   Chlorine exists as a number of different isotopes. What is meant by the term isotopes? 3.2   A chloride ion has a symbol shown.   Right-click on the button to open the data booklet in a new tab.            a How many neutrons are contained in this chloride ion?   b How is a chloride ion formed from the chlorine atom?   c Which atom forms an ion with a 1+ charge and has the same number of electrons as Cl-?        

1.27 An isotope of chromium has an atomic mass of 52g.mol-1 . Which statement about an atom of this isotope of chromium is correct?

1.28 During the electrolysis of concentrated hydrochloric acid, gases are produced at both electrodes. Which statement describes the test result for the gas collected at the negative electrode?

1.19 Which statement about aluminium is not correct?