During a chemical reaction, the reactants get used up as the products are formed. We can measure the speed of a reaction by measuring the amount of a reactant used up or amount of a product obtained per unit time. In this video we will learn how to measure reaction rate and which factor are affecting them
▧▧ TOPIC COVERED ▧▧
❖ Definition of reaction rate
❖ Measuring reaction rate
❖ Factors affecting reaction rate
❖ Comparing rate curves
▧▧ Relevant Past Paper Questions ▧▧
November, 2009 ※ In the presence of yeast, aqueous glucose, C6H12O6, is changed into carbon dioxide and ethanol. Suggest how the speed of this reaction varies as the temperature changes from 20 to 60 °C. [2]
June, 2010 ※ One of the reactions in the manufacture of nitric acid involves the oxidation of ammonia. This reaction is exothermic.
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O ΔH = –909 kJ mol–1
The reaction is carried out at a pressure of 10 atmospheres and a temperature of 900°C.
(i) Predict and explain the effect on the position of equilibrium if the reaction is carried out at 10 atmospheres pressure and 700°C rather than 900°C. [2]
(ii) Predict and explain the effect on the position of equilibrium if the reaction is carried out at 900°C and 20 atmospheres pressure rather than 10 atmospheres. [2]
November, 2010 ※ Iron reacts with dilute hydrochloric acid.
Fe(s) + 2HCl(aq) → FeCl2(aq) + H2(g)
Use ideas about particles to describe and explain the effect of temperature on the speed of this reaction. [2]
November, 2010 ※ Carbonyl chloride, COCl2, is a colourless, poisonous gas formed when carbon monoxide and chlorine combine in the presence of sunlight. The forward reaction is exothermic.
CO(g) + Cl2(g) → COCl2(g)
Predict and explain how each of the following affects the position of equilibrium in this reaction:
(i) increasing the concentration of chlorine; [2]
(ii) increasing the pressure; [2]
(iii) increasing the temperature. [2]
Quiz for practice from this video: https://quizizz.com/join/quiz/607c5bfb6257d7001d4834ab/start
Disclaimer
Some free images have been used in this video for education purpose only. If you have any objection on any content of this video please contact me.
Contact: [email protected]
▶️ DTube