QUESTION 6   The graph shows how the temperature of a substance changes as it is cooled over a period of 30 minutes. The substance is a gas at the start.   Right-click on the button to open the data booklet in a new tab.        Each letter on the graph may be used once, more than once or not at all. State when:   6.1 the particles in the substance have the most kinetic energy? [1] 6.2 the particles in the substance are furthest apart? [1] 6.3 the substance exists as both a gas and a liquid? [1] 6.4 The moment that all the substance is solid? [1] 6.5 Use the graph to estimate the freezing point of the substance. [1] 6.6 Name the change of state directly from a solid to a gas. [1]   When smoke is viewed through a microscope, the smoke particles in the air appear to jump around.   6.7 What term describes this movement of the smoke particles? [1] 6.8 Explain why the smoke particles move in this way. [2]     [9]

1.31 Which statement describes the structure of copper?  

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

1.32 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?

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

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]