IGCSE Chemistry Structured Questions Exam Tips

Learn how to write step-by-step answers, and score A* in your exam!

Announcement: Cambridge IGCSE, and AS & A Level November 2024 past papers are now available.

Written papers assess the candidate’s knowledge with understanding, and skills in handling information and solving problems. The questions are theoretically based and answers must be written in the spaces provided. Short-answer questions only have one or two parts while structured questions contain many parts. Often later parts can depend on the answer to earlier parts. This article aims to give the candidates an overlook of this kind of question.


Basic guidelines

  1. The number of marks will give you clue to how many points are needed. For example, if a question has two marks allocated to it, you must write two pieces of information. 
  2. There is only one acceptable and precise answer in writing the names of different reactions, processes and experiments and their definition. You must learn them and be accurate on writing them.
  3. Don’t confuse the properties of elements with those of their compounds (especially when they appear in the same question). For example, if asked about the properties of the element oxygen, don’t give the properties of an oxide.
  4. Describe specific examples of experiment or reaction. Do not provide general descriptions.  When describing an experiment, a labeled diagram often helps the description.
  5. Writing vague answers will not let you earn a mark. Write specific answers to the questions.
  6. Check for contradictions within your answer. For example, a common error is to write ‘a white insoluble precipitate dissolves.’ 
  7. Show your working when answering a ‘calculate’ question. You may get some credit even if your answer is wrong. Writing your working can also help you spot errors you have made.

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Read the question carefully and answer only what is asked

Writing answers that contain factually correct chemistry but do not answer the question will not give you additional marks. Answer directly and focus on what is being asked. Learn how to answer the common questions as it would help to understand what is required by the question. Below is a glossary of terms used in science papers and their brief definition. Look out for these command words and write your responses accordingly.

Command wordWhat it means
Analyseexamine in detail to show meaning, identify elements and the relationship between them
Calculatework out from given facts, figures or information
Compareidentify/comment on similarities and/or differences
Considerreview and respond to given information
Contrastidentify/comment on differences
Deduceconclude from available information
Definegive precise meaning
Demonstrateshow how or give an example
Describestate the points of a topic / give characteristics and main features
Determineestablish an answer using the information available
Discusswrite about issue(s) or topic(s) in depth in a structured way
Evaluatejudge or calculate the quality, importance, amount, or value of something
Examineinvestigate closely, in detail
Explainset out purposes or reasons / make the relationships between things evident / provide why
and/or how and support with relevant evidence
Giveproduce an answer from a given source or recall/memory
Identifyname /select/recognise
Justifysupport a case with evidence/argument
Predictsuggest what may happen based on available information
Show (that)provide structured evidence that leads to a given result
Sketchmake a simple freehand drawing showing the key features, taking care over proportions
Stateexpress in clear terms
Suggestapply knowledge and understanding to situations where there are a range of valid
responses in order to make proposals / put forward considerations
Command words

Learn how to write chemical equations in words and using symbols

Most of the questions would involve chemical and word equations. You must be able to read and write the correct chemical symbols and word equations. However, do not combine symbols and words in the same answer. For example, if it asks for a word equation, do not write a symbol equation. A word equation tests knowledge of chemical names.

When working out formulae, do not be confused by oxidation numbers. You have to balance the positive and negative charges in a formula. Note that subscripts should be used correctly too when writing out the formulae.

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Use the Periodic Table accurately

A periodic table is provided at the back of the papers. Utilise this as it will help you to answer some questions. Familiarise the layout and know what are the Groups, the Periods, the position of proton number and relative atomic mass of the element, and that the volume of one mole of gas at room temperature and pressure (r.t.p.) is shown at the bottom of the Periodic Table. For example, when the question asks to ‘Calculate the relative formula mass of a chemical compound,’ the Periodic table can be used to find the relative atomic masses of each of the atoms in the given chemical equation.

The Periodic Table can also be used to identify transition elements  Transition elements are in the centre of Periodic Table, between Groups 2 and 3. The properties of transition elements often cause problems. If asked about the specific properties of transition metals, don’t list general properties of metals, such as ‘shiny’, ‘malleable’. When distinguishing between a transition metal and a non-transition metal, information on boiling points is more important than information on density.

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*Relevant info taken from CIE.

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4 responses

  1. Could you give some tips for atp paper for all three sciences like how to draw a graph and what to include in the questions about designing an experiment and how to answers questions asking how to improve the experiment

    1. Hi Mr. X,

      One major tip when drawing a graph is to use the appropriate scale on the axis. This ensures that the graph covers the graph paper properly (the graph is not overdrawn or too small with respect to the graph space provided). Always label your graph (title and axis) and when doing a line graph always connect the data points with the best-of-fit line.

      When designing an experiment the main points come from the flow of the procedure and how easily it can be followed by another person (think about if the other students would be able to replicate the same experiment just from reading your notes). Also, make the sentences short, in sequence, and easy to comprehend.

      Answering questions on how to improve the experiment requires a keen understanding of how the experiment was conducted. One major focus would be finding areas in the experiment where the student was not being objective (such as using their eyes to determine a color change rather than using a colorimeter) or where the experiment is not standardized (such as using warm water in a beaker, rather than using a water bath, when heating contents of a test tube).

      I hope this helps. We are here for you!

      Regards,
      Chemistry Department

  2. Keep posting such kinds of blogs regarding the IGCSE Chemistry Program. The whole post is so informative!

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