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PAPER 3: General and Practical Principles in Chemistry
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Instructions
• Use black ink or ball-point pen.
• IfFillpencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• centre number
in the boxes at the top of this page with your name,
and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
Information
• The total mark for this paper is 120.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• ability
For the question marked with an asterisk (*), marks will be awarded for your
to structure your answer logically, showing the points that you make are
related or follow on from each other where appropriate.
• A Periodic Table is printed on the back cover of this paper.
Advice
• Read each question carefully before you start to answer it.
• Show all your working in calculations and include units where appropriate.
• Check your answers if you have time at the end. Turn over
(d) Adding cyclic hydrocarbons to fuels results in more efficient combustion.
These compounds can be made by reforming straight‑chain alkanes.
Write an equation for the reforming of pentane into a cyclic hydrocarbon, using
skeletal formulae for the organic compounds.
State symbols are not required.
(2)
(Total for Question 1 = 7 marks)
2
*P71914A0232*
, 2 This question is about some reactions of the elements of Group 1 and Group 2 of the
Periodic Table and their compounds.
(a) Group 2 metals react vigorously with oxygen when heated.
(i) Write the equation for the reaction between magnesium and oxygen.
Include state symbols.
(1)
(ii) Explain the trend in reactivity of the elements down Group 2.
(3)
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