Chemical Kinetics
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About this topic
This topic introduces the factors affecting the rate of chemical reactions: concentration, temperature, surface area, and catalysts. Learners develop investigative skills by designing experiments to measure reaction rates. This aligns with the CBC's emphasis on inquiry-based learning and STEM. Understanding kinetics is important for interpreting real-world processes and for answering application-based questions in Zambian Form examinations and ECZ assessments.
What you'll practise (16 questions)
- The apparatus shown can be used to find the rate of some chemical reactions. The above set up, can be used to measure the rate of reaction between... A) aqueous silver nitrate and aqueous potassium iodide B) magnesium ribbon and dilute hydrochloric acid C) sodium hydroxide solution and copper (II) sulphate solution D) sodium hydroxide solution and dilute hydrochloric acid
- The diagram below shows an energy level diagram for a catalysed and non-catalysed reaction. Which letter represents the activation energy of the uncatalysed reaction?
- Which letter represents the activation energy of the catalysed reaction?
- In the experiment with marble chips and hydrochloric acid, plot a graph of volume of carbon dioxide produced against time.
- Use your graph to determine the volume of gas produced during the first 25s of the reaction.
- Use your graph to determine the time taken to produce 45cm³ of carbon dioxide gas.
- How long did it take for the reaction to end?
- What was the total volume of gas produced in the experiment?
- State two factors which can be altered to increase the rate of the reaction between calcium carbonate and hydrochloric acid.
- Magnesium reacts with an excess of dilute hydrochloric acid. The graph shows how the volume of hydrogen gas given off changes with time. Why is the graph horizontal at Y?
- Aqueous hydrogen peroxide decomposes to form water and oxygen as shown in the equation. The following experiments were carried out to measure the rate of production of oxygen. Which graph best shows the results indicated?
- Magnesium reacts with hydrochloric acid. Which solution would give the fastest initial rate of reaction?
- Which statement about catalysts is correct?
- On the same graph, sketch how the curve would appear if powdered limestone was used.
- What is a catalyst?
- What is activation energy?
Answer each question above to see the correct answer and a full explanation.