The CXC marking criteria for the Proposal (10 marks) and Implementation (20 marks) of an investigation: hypothesis, aim, method, variables, results, discussion, limitations, reflections and conclusion.
5 narrated scenes. Press play, listen and read along — the points appear as they are explained. Use ‹ Prev / Next › or the scene bar to jump to any scene.
Planning and Analysis are the two skills used for the Year 2 investigative project, and their criteria are printed in the syllabus. Learn the mark scheme and you know exactly what to write.
Narration uses your device’s built-in voice. No sound? Switch to “Captions only” — the captions advance on their own.
Copy these into your notebook in your own words — that is how they stick.
Hypothesis 2, aim 1, materials 1, method 2, controlled variable 1, expected results 2, assumptions/precautions 1.
Clearly stated and testable.
Related to the hypothesis.
Suitable; includes a manipulated or responding variable.
Method 1, results 4, discussion 5, limitations 3, reflections 5, conclusion 2.
Correct formulae and equations (2) and accuracy of data (2).
Explanation (2), interpretation supported by data (2), trends (1).
Stated and related to the aim.
3 quick games on this lesson. Earn XP and badges as you play — your best score for each game is saved. Games are for practice and do not change your exam readiness. More games in the Chemistry Arcade.
8 items modelled on real CSEC Paper 1 questions. Choose one answer for each, then check. Aim for 80% or better. Work each item on paper first.
Write full answers, then reveal the mark scheme and tick the points you earned (24 marks in total). Show all your working — method marks count. Your answers are saved on this device.
Question 1 [24 marks]
Use the CXC criteria for an investigation to answer these questions.
(a) (a) State the marks for each of the seven criteria in the Proposal (Planning and Design). [7]
(b) (b) State the marks for each of the six sections of the Implementation. [6]
(c) (c) Write a testable hypothesis and an aim for an investigation of how the temperature affects the rate of reaction between sodium thiosulfate and hydrochloric acid. [4]
(d) (d) State the manipulated, responding and two controlled variables for the investigation in (c). [4]
(e) (e) State what the Discussion section should contain. [3]
Everything in this lesson is based on these parts of the CXC syllabus and papers.