Edexcel GCSE Chemistry C1 Topics 1 and 2 test 13_14

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    RT

    American Academy LarnacaYear 3 ScienceSemester

    Unit Cl

    9November 2 3Part A Time: 2 minutes

    RT urn ov r

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    PART A

    1. (a) Most metal carbonates decompose when they are heated.

    The products are the solid metal oxide and carbon dioxide gas.

    A student heated equal masses of different metal carbonates using the same Bunsen

    flame in each case.

    The bar chart shows the mass lost by each metal carbonate after it had been heated fortwo minutes.

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    Use the data to explain which of the metal carbonates seems to be the most thermally

    stable.

    (2)

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    ..

    (b) Write the balanced equation for the decomposition of copper carbonate, CuCO 3,

    to copper oxide and carbon dioxide.

    .......................................................................................................................................(2)

    (c) The decomposition of calcium carbonate produces calcium oxide.

    Calcium oxide reacts with water.

    The equation for the reaction is

    (i) 5.6 g of calcium oxide reacts with water to form 7.4 g of calcium hydroxide.

    Calculate the mass of the water that has reacted.

    (1)

    ............................................................................................................................................

    ............................................................................................................................................

    answer = .................................................... g

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    (ii) Describe how the solid calcium hydroxide could be used to test for carbon dioxide.

    (2)

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    (Total for Q1 = 7 marks)

    2. A student used the internet to find information about the percentages of different

    gases in the Earths early atmosphere.

    She was surprised to find the information given on two websites was very different.

    The information from the two websites is shown in the table.

    (a) One of the gases in the table is present in a much larger amount in todays

    atmosphere.

    State the name of this gas. (1)

    ............................................................................................................................................

    (b) A gas not named in the table makes up about 21% of todays atmosphere.

    State the name of this gas. (1)

    ............................................................................................................................................

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    (c) (i) Complete the sentence by putting a cross (X) in the box next to your answer.

    The amount of carbon dioxide in the early atmosphere was reduced by (1)

    (ii) Explain how carbon dioxide is released into the atmosphere.

    (2)

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    (d) In an experiment to find the percentage of oxygen in the air, some copper was

    heated in 50.0 cm3of dry air.

    All of the oxygen in this sample of air reacted to form copper oxide.

    After the reaction, the volume of gas remaining was 41cm3.

    (i) Calculate the percentage of oxygen in this sample of air.

    (2)

    % oxygen = .......................................

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    (ii) The word equation for the reaction is

    copper + oxygen copper oxide

    Balance the equation for this reaction by putting numbers in the spaces provided.

    (1)

    ............Cu + O2 ...........CuO

    (Total for Q2 = 8 marks)

    3. A student produced this sketch of a quarry face.

    (a) The limestone shown was originally formed in layers.

    State what type of rock limestone is. (1)

    ............................................................................................................................................

    (b) Granite is an igneous rock formed from magma.

    (i) Explain how the marble has formed above the granite. (2)

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    (ii) Explain why the rock at Xcontained larger crystals than the rock atY. (2)

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    (Total for Q3 = 5 marks)

    (Total for Part A= 20 marks)

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    P RT

    American Academy LarnacaYear Science

    Semester Test 2Unit Cl hemistry

    TopicTopic 2Tuesday 9 November 2 3PartB Time: 2 minutes

    P RT urn over

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    PART B

    1 (a) The diagram shows some reactions involving calcium compounds.

    (i) How is the calcium carbonate turned into calcium oxide in reaction 1? (1)

    ............................................................................................................................................

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    (ii) State two observations that can be made when water is added, one drop at a time, to

    cold calcium oxide (reaction 2).

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    (2)

    (iii) Write the balanced equation for the reaction of calcium hydroxide with carbon

    dioxide (reaction 4). (2)

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    ............................................................................................................................................

    (iv) State the common name for calcium hydroxide solution. (1)

    ............................................................................................................................................

    (b) Calcium carbonate, CaCO3, is added to acidic soils.

    The calcium carbonate reacts with the acid in the soil and produces a salt.

    (i) What type of reaction does the acid undergo when it reacts with the calcium

    carbonate? (1)

    ............................................................................................................................................

    (ii) Explain why waste gases from coal-fired power stations are passed through calcium

    carbonate.

    (2)

    ............................................................................................................................................

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    (c) Complete the balancing of this equation by putting numbers in the spaces provided.

    (2)

    ...........Al + ...........O2 .Al2O3

    (Total for Q1 = 11 marks)

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    2 (a) (i) Which of the gases listed below is naturally present in the atmosphere?

    Put a cross in the box next to your answer.

    (1)

    (ii) As the Earth cooled, oceans formed.How did this affect the composition of the atmosphere?

    (1)

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    -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

    (b) (i) Which of these is not a naturally occurring form of calcium carbonate?

    Put a cross (x) in the box next to your answer.

    (1)

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    *(ii) Even though limestone is an important raw material in the chemical industry,many people are against plans to open new limestone quarries.

    Discuss the advantages and disadvantages, to the local community and itssurroundings, of opening a new limestone quarry.

    (6)

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    (Total for Q2 = 9 marks)

    (Total for Part B= 20 marks)

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    PART A Mark scheme

    2. (a) nitrogen

    (b) oxygen

    (c ) (i) D

    (ii)

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    Burning fossil fuels

    (d) (i) & (ii)

    3. (a) & (b)

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    PART B Mark scheme

    1. (a) (i) heat

    (ii)

    (iii)

    (iv)

    (b) (i) neutralization

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    (ii)

    OR

    (c ) ........4...Al + .......3....O2 2.Al2O3

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    2 (a) (i) A

    (ii)

    (b) (i) D

    (ii)

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