1. Marie mixed 5 g of carbon with 5 g of lead oxide. She heated the mixture strongly for 15 minutes in a fume cupboard.
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1 1. Marie mixed 5 g of carbon with 5 g of lead oxide. She heated the mixture strongly for 15 minutes in a fume cupboard. After 15 minutes, Marie found some shiny beads in the mixture. a. (i) Marie collected all the shiny beads from this experiment. How could she test them to show they were metal? (ii) Marie s test showed that the tiny beads were metal. What metal were the beads likely to be?
2 b. Marie also expected carbon dioxide to be formed in this experiment. (i) In carbon dioxide, what element is combined with carbon? (ii) Where, apart from the air, did this element come from in this experiment? c. Give one safety precaution Marie should take during this experiment. Total 5 marks 2. a. Samantha opened a tin of white paint. The paint consisted of a liquid and particles of titanium dioxide that are insoluble in the liquid. The paint had separated into two layers, as shown below.
3 (i) What type of substance is the paint? Tick the correct box. Element compound mixture (ii) What type of substance is titanium dioxide? Tick the correct box. Element compound mixture (iii) Why did the particles of insoluble titanium dioxide sink to the bottom? b. Samantha stirred the paint and used it to paint a window frame. She got some of the paint on the glass. Samantha could not get the paint off the glass with water. When she used a different liquid called white spirit the paint came off. Why could she remove the paint with white spirit but not with water? Total 4 marks
4 3. Chris has two rubber party balloons. One is filled with air and the other is filled with helium. Both balloons contain the same volume of gas. a. (i) Explain why the helium balloon rises. (ii) Explain why the air balloon drops to the ground.
5 b. The chemical symbol for helium is He. Explain why air does not have a chemical symbol or formula.. c. The diagram below shows seven arrangements of particles. The two party balloons are coated with a thin layer of aluminium. Give the letter of the diagram which best represents the particles in: (i) the helium gas;... (ii) the air;... (iii) the thin layer of aluminium.... d. Over several days, the balloons shrink because the particles of gas diffuse through the balloon and escape. The helium balloon shrinks more quickly than the air-filled balloon. Answer the following questions in terms of particles. (i) Why does helium escape more quickly than air from a balloon?.
6 (ii) A rubber balloon coated with aluminium takes longer to shrink than a rubber balloon without an aluminium coating. Suggest a reason why gas particles diffuse more slowly through aluminium than through rubber An experiment was set up as shown in the diagram. Total 8 marks a. (i) How many elements are present in the compound copper sulfate, CuSO 4, which is dissolved in the water before the start of the experiment?
7 (ii) Give the two products formed by the reaction which occurs, when the zinc is lowered into the solution of CuSO marks (iii) Give one other metallic element which will react in a similar way to zinc... b. The flask and contents shown above were weighed and the temperature was noted. The zinc was lowered into the solution and the flask was swirled. After five minutes, the mass and temperature were recorded again. What change, if any, would there be in the mass of the flask and contents?.. c. The experiment was repeated using a piece of silver instead of zinc. What change, if any, would you see in the colour of the solution?.. Total 6 marks
8 5. The diagram shows an outline of part of the Periodic Table of Elements. a. What is the name of the element with the symbol H?.. b. In which regions of the Periodic Table are the following types of element found? (i) non-metals (such as oxygen and chlorine); Region (ii) very reactive metals (such as sodium and potassium); Region (iii) less reactive metals (such as copper and zinc). Region c. Why is copper sulfate not found in the Periodic Table?..
9 d. An iron nail is placed into some blue copper sulfate solution. A reaction takes place between the iron and the copper sulfate. (i) Complete the word equation for the reaction. iron + copper sulfate +.. (ii) Describe one change you would see on the surface of the nail a. Ruth put a piece of a different metal in each of four test tubes. She poured 10 cm 3 of hydrochloric acid onto each metal. Total 7 marks Look at the diagrams above. (i) How do these show if a metal reacts with the acid?
10 (ii) On the lines below, put the four metals in the order of how strongly they react with the acid. most reactive least reactive... (iii) Where on the list on part (a)(ii) would you place gold? b. Choose the name of a metal used in the above experiment to answer each question. (i) Which metal from the box is used for electrical wires? (ii) Which metal from the box goes rusty? Total 5 marks
11 7. A science teacher showed her class three experiments, A, B and C. The experiments and the word equations for the reactions that took place are shown below. All the experiments were done in a fume cupboard.
12 a. From the substances in experiments A, B and C, above, give the name of: (i) one metallic element;... (ii) one non-metallic element;... (iii) two compounds.... b. In experiment B, the iron filings weighed 2.0 g at the beginning of the experiment and the iron sulfide produced weighed 2.8 g. Explain this increase in mass. c. Complete the word equation for the chemical reaction in experiment C. copper + chlorine!... Total 5 marks [TOTAL FOR CHEMISTRY SECTION: 40 MARKS]
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