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Improving Processes & Products (OCR GCSE Combined Science A (Gateway): Chemistry): Exam Questions

Exam code: J250

48 mins18 questions

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Improving Processes & Products

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1
1 mark

The table shows the main stages in the life-cycle assessment of a manufactured product.

Stage

Process

1

Manufacturing the product

2

Obtaining raw materials

3

Disposing of the product

4

Using the product

What is the correct order for the stages?

  • 1, 2, 3, 4

  • 1, 2, 4, 3

  • 2, 1, 4, 3

  • 2, 4, 1, 3

Choose your answer

1
1 mark

Zinc is extracted from zinc oxide by reduction.

Which element acts a reducing agent during this process?

  • Hydrogen

  • Oxygen

  • Carbon

  • Zinc 

Choose your answer

2
1 mark

Which of the following metals can not be extracted from its ore by reduction?

  • Iron

  • Zinc

  • Copper

  • Lithium

Choose your answer

3
1 mark

Coffee cups are usually made from ceramic, glass, paper, plastic or metal.

Some of these materials are recyclable. In a Life Cycle Assessment (LCA) where would this information be given?

  • During the extraction and processing of the raw materials needed to make the cup

  • Disposing of the cup at the end of its useful life

  • When the cup is manufactured and packaged

  • During the use and lifetime of the cup

Choose your answer

4
1 mark

Which material for making coffee cups would be considered recyclable and biodegradable?

  • Polymers

  • Ceramic

  • Glass

  • Paper

Choose your answer

5
1 mark

When comparing the LCA of a plastic bag to a paper bag you can say that

  • A plastic bag has a greater impact on the environment than a paper bag

  • A paper bag has a greater impact on the environment than a plastic bag

  • Both bags are made from finite resources

  • It is difficult to say whether a paper or plastic bag has a greater impact on the environment

Choose your answer

6
1 mark

What is true about single use paper plates?

  • They are heavier to transport than plastic plates

  • They increase global warming

  • They can be incinerated to release energy

  • All the above are true

Choose your answer

7
1 mark

Look at the information about four different polymers.

Polymer

Cost (£ per kg)

Tensile strength (MPa)

Melting point (°C)

Maximum useable temperature (°C)

A

0.74

15

120

85

B

1.20

78

254

70

C

0.92

35

176

160

D

1.42

42

156

160

Which polymer would be best for making a plastic cup to hold hot drinks?

    Choose your answer

    8
    1 mark

    Look at the information about four different polymers.

    Polymer

    Cost (£ per kg)

    Tensile strength (MPa)

    Melting point (°C)

    Maximum useable temperature (°C)

    A

    0.74

    15

    120

    85

    B

    1.20

    78

    254

    70

    C

    0.92

    35

    176

    160

    D

    1.42

    42

    156

    160

    Which polymer would be best for making a plastic washing up bowl?

      Choose your answer

      9
      1 mark

      Higher Only

      Phytoextraction is one way to extract copper from low-grade ores.

      The table shows the main stages involved in phytoextraction.

      Stage

      Process

      1

      Copper ions accumulate in the roots, shoots and leaves of plants.

      2

      Copper is extracted from ash with a high concentration of copper compounds.

      3

      Plants absorb dissolved copper ions through their roots.

      4

      A crop is planted in soil containing low-grade copper ore.

      5

      Plants are harvested and burned.

      What is the correct order for the stages?

      • 1, 3, 4, 5, 2

      • 4, 1, 3, 2, 5

      • 4, 3, 1, 5, 2

      • 1, 4, 3, 5, 2

      Choose your answer

      10
      1 mark

      Higher Only

      Which one of the following is an advantage of phytoextraction?

      • A high concentration of a metal can be obtained from a low grade ore.

      • Bacteria are used to dissolve metals instead of chemical solutions.

      • Better crops of plants are harvested.   

      • Phytoextraction is a quick process and is not affected by poor weather.

      Choose your answer

      1
      1 mark

      Aluminium is extracted by the electrolysis of molten aluminium oxide, Al2O3.

      Which equation shows the reaction at the anode in this electrolysis?

      • 4OH– – 4e– → O2 + 2H2O

      • Al 3+ + 3e– → Al

      • 2H+ + 2e– → H2

      • 2O2– – 4e– → O2

      Choose your answer