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?     volume of water added / cm3 temperature / °C A 10 30 B 10 50 C 40 30 D 40 50

1.17 Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table?     can be used as a catalyst   conducts electricity when solid has low density   forms coloured compounds   A Yes Yes No Yes B Yes Yes Yes No C Yes No Yes Yes D No Yes Yes Yes

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

1.23 Carbon monoxide is an air pollutant produced when petrol is burned in a car engine. Why is carbon monoxide considered to be an air pollutant?

  QUESTION 5 5.1 Most metals have a high melting point. State one other physical property that all metals have. [1] 5.2 Iron often rusts. Name the two substances, other than iron, that must be present for iron to rust.   [1]   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? [1] 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 …   [2] 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 …. [3]     [8]    

  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. [2] 7.2 Name an insoluble cobalt salt. [1] 7.3 Name an insoluble yellow lead salt. [1]     [4]

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

1.38 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? [2] 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? [1]   b How is a chloride ion formed from the chlorine atom? [1]   c Which atom forms an ion with a 1+ charge and has the same number of electrons as Cl-? [1]       [5]