How Paper 02 is built (data analysis plus structured questions, 100 marks), how to answer command words, graphs, calculations and equations, and a mini mock to self-mark.
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.
Paper 02 carries half of your grade. Marks are won by precise words, correct equations with conditions, and calculations shown line by line.
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.
2 h 30 min; 6 compulsory questions; 100 marks; 50% of the grade.
Data analysis, 25 marks.
Structured, 15 marks each.
State, describe, explain, calculate, compare, suggest.
Labelled axes with units; plot ±½ square; smooth curve; large triangle.
Formula, balanced equation, ratio, unit.
Balance; state symbols; conditions.
≈ 1.5 min per mark.
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 (18 marks in total). Show all your working — method marks count. Your answers are saved on this device.
Question 1 [12 marks]
The solubility of potassium nitrate in 100 g of water at different temperatures is: 20 °C, 32 g; 30 °C, 46 g; 40 °C, 64 g; 50 °C, 85 g; 60 °C, 110 g.
(a) (a) Plot a graph of solubility (y-axis) against temperature (x-axis). [3]
(b) (b) Draw a smooth curve through the points. [1]
(c) (c) Use your graph to find the solubility of potassium nitrate at 45 °C. [2]
(d) (d) Describe the trend shown by the graph and explain it using particles. [2]
(e) (e) Calculate the mass of potassium nitrate that crystallises when 100 g of water saturated at 60 °C is cooled to 30 °C. [2]
(f) (f) State two precautions to ensure accurate solubility readings. [2]
Question 2 [6 marks]
Calcium carbonate reacts with hydrochloric acid: CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂. A student collects 6.0 dm³ of carbon dioxide at room temperature and pressure (molar volume 24 dm³/mol). (Ca = 40, C = 12, O = 16)
(a) (a) Calculate the number of moles of carbon dioxide collected. [2]
(b) (b) State the number of moles of calcium carbonate that reacted, giving a reason. [1]
(c) (c) Calculate the mass of calcium carbonate that reacted. [3]
Everything in this lesson is based on these parts of the CXC syllabus and papers.