Miss

Topics: Trans fat, Vegetable oils, Copper Pages: 7 (1367 words) Published: September 1, 2010
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General Certificate of Secondary Education June 2007 SCIENCE B Unit Chemistry C1 CHEMISTRY Unit Chemistry C1 Higher Tier Thursday 21 June 2007 1.30 pm to 2.15 pm CHY1H

H
For Examiner’s Use
Question Mark Question Mark

For this paper you must have: a ruler. You may use a calculator.

Time allowed: 45 minutes Instructions Use blue or black ink or ball-point pen. Fill in the boxes at the top of this page. Answer all questions. Answer the questions in the spaces provided. Do all rough work in this book. Cross through any work you do not want to be marked. Information The maximum mark for this paper is 45. The marks for questions are shown in brackets. You are expected to use a calculator where appropriate. You are reminded of the need for good English and clear presentation in your answers. Advice In all calculations show clearly how you work out your answer.

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Examiner’s Initials

G/M21768/Jun07/CHY1H

6/6/6/6

CHY1H

2 Answer all questions in the spaces provided.

LEAVE MARGIN BLANK

1 Limestone contains the compound calcium carbonate, CaCO3. (a) Limestone is used to make cement in a rotary kiln. Waste gases Limestone and clay

Methane and air Cement

Use the information in the diagram to name the two main waste gases from this rotary kiln. 1 ..................................................................................................................................... 2 ..................................................................................................................................... (2 marks)

G/M21768/Jun07/CHY1H

3 (b) Columns used as supports for buildings can be made from materials such as limestone blocks or concrete. Concrete mixture Limestone blocks

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Steel rods

Concrete is a mixture of cement, sand, small stones and water From the diagrams, name which you think is the better material for making a column. ............................................................................................................................................. Give three advantages for your choice of material. 1 ........................................................................................................................................... ............................................................................................................................................. 2 ........................................................................................................................................... ............................................................................................................................................. 3 ........................................................................................................................................... ............................................................................................................................................. (3 marks)

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Turn over for the next question

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G/M21768/Jun07/CHY1H

4 2 Copper is a widely used metal. The main ore of copper contains copper sulfide. Copper can be extracted from copper sulfide in a three stage process. (a) In the first stage of extraction the copper sulfide is heated in air. (i) Balance the symbol equation for the reaction. Cu2S + ..........O2 → ..........CuO + SO2 (1 mark)

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(ii) Explain why there would be an environmental problem if the gas from this reaction were allowed to escape into the atmosphere. .................................................................................................................................... .......................................................................................................................................
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