IB Chemistry Rates of Reaction Data Practice
A practice set for IB Chemistry Paper 2 in which students analyze gas-volume data from calcium carbonate and hydrochloric acid, plotting results, calculating rates, and interpreting how concentration and surface area affect reaction speed. Designed for a 60-minute independent or small-group session, it builds graphing, rate calculation, and scientific reasoning skills for upper-secondary students.
Teacher Guide & Tips
- Use as a timed Paper 2-style practice block (about 45-60 minutes), either independently or in pairs, after students have covered collision theory and rate of reaction.
- Discussion question: Why does the rate of gas production slow down over time, and how does the shape of the curve relate to the changing concentration of hydrochloric acid?
- Scaffold for struggling students: Provide a worked example of calculating the gradient at a single point on a curve using a tangent, and remind them to label axes with units before plotting.
- Extension for advanced students: Ask them to predict how the curve would change if the experiment used powdered calcium carbonate or 0.5 mol dm⁻³ acid, and justify their predictions using collision theory.
- Estimated time: about 15 minutes for plotting and graphing questions, plus 30-40 minutes for the calculation and evaluation questions.
IB Chemistry Rates of Reaction Data Practice
A practice set for IB Chemistry Paper 2 in which students analyze gas-volume data from calcium carbonate and hydrochloric acid, plotting results, calculating rates, and interpreting how concentration and surface area affect reaction speed. Designed for a 60-minute independent or small-group session, it builds graphing, rate calculation, and scientific reasoning skills for upper-secondary students.
Teacher Guide & Tips
- Use as a timed Paper 2-style practice block (about 45-60 minutes), either independently or in pairs, after students have covered collision theory and rate of reaction.
- Discussion question: Why does the rate of gas production slow down over time, and how does the shape of the curve relate to the changing concentration of hydrochloric acid?
- Scaffold for struggling students: Provide a worked example of calculating the gradient at a single point on a curve using a tangent, and remind them to label axes with units before plotting.
- Extension for advanced students: Ask them to predict how the curve would change if the experiment used powdered calcium carbonate or 0.5 mol dm⁻³ acid, and justify their predictions using collision theory.
- Estimated time: about 15 minutes for plotting and graphing questions, plus 30-40 minutes for the calculation and evaluation questions.