Author: Anonymous

1.32 Calcium carbonate reacts with dilute hydrochloric acid. The equation for the reaction is shown. CaCO3 + 2HCl — > CaCl 2 + H2O + CO2 1.00 g of calcium carbonate is added to 50.0 cm3 of 0.0500 mol / dm3 hydrochloric acid. Which volume of carbon dioxide is made in this reaction?

1.24 The diagram shows a cup of hot tea.   Right-click on the button to open the data booklet in a new tab.        Which row describes the water particles in the air above the cup compared with the water particles in the cup?   Moving faster Closer together A Yes No B Yes Yes C No No D No Yes

1.31 Which statement describes the structure of copper?  

1.35 Carbonic acid is a weak acid formed when carbon dioxide dissolves in water. What is the pH of the solution?

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

1.30 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

  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]    

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 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]