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Monitoring and controlling chemical reactions
Revision and exam practice for Monitoring and controlling chemical reactions.
12
Objectives
10
Flashcards
10
Questions
88 min
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OcrGcseCombined Science A GatewayMonitoring and controlling chemical reactions
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12 objective pages available
Determining Reaction Rates: Practical Methods1 objectives
- Apply biological knowledge to suggest practical methods for determining the rate of a given reaction.
Interpreting Rate of Reaction Graphs1 objectives
- Draw supported meaning from rate of reaction graphs.
Factors Affecting Reaction Rate1 objectives
- Communicate the key features of the effect of changes in temperature, concentration, pressure, and surface area on rate of reaction.
Explaining Reaction Rates: Collision Theory1 objectives
- Account for the effects on rates of reaction of changes in temperature, concentration and pressure in terms of frequency and energy of collision between particles.
Effect of Surface Area on Reaction Rates1 objectives
- Account for the effects on rates of reaction of changes in the size of the pieces of a reacting solid in terms of surface area to volume ratio.
Catalysts and Reaction Rates1 objectives
- Communicate the key features of the characteristics of catalysts and their effect on rates of reaction.
Understanding Catalysts in Chemical Reactions1 objectives
- Recognise catalysts in reactions.
Catalytic Action and Activation Energy1 objectives
- Account for catalytic action in terms of activation energy.
Enzymes as Biological Catalysts1 objectives
- Retrieve and apply knowledge of enzymes act as catalysts in biological systems.
Understanding Reversible Reactions1 objectives
- Retrieve and apply knowledge of some reactions may be reversed by altering the reaction conditions.
Understanding Dynamic Equilibrium in Chemical Reactions1 objectives
- Retrieve and apply knowledge of dynamic equilibrium occurs in a closed system when the rates of forward and reverse reactions are equal.
Predicting Equilibrium Shifts with Le Chatelier's Principle (Higher)1 objectives
- Use evidence to predict the effect of changing reaction conditions on equilibrium position and suggest appropriate conditions to produce as much of a particular product as possible.
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Practice preview
- A student investigated the rate of reaction between marble chips (calcium carbonate) and hydrochloric acid. They measured the mass of carbon dioxide gas produced over time. Their results are shown in the graph below. [Graph description: A graph with 'Time (s)' on the x-axis from 0 to 180 and 'Mass of CO2 produced (g)' on the y-axis from 0 to 1.2. The curve starts at (0,0), rises steeply, then gradually flattens out, reaching a horizontal line at approximately 1.0 g CO2 at around 120 seconds.] Using the graph, estimate the time taken for the reaction to produce 0.5 g of carbon dioxide. Give your answer to the nearest 5 seconds. [2 marks]
- A student investigates the effect of temperature on the rate of reaction between sodium thiosulfate solution and hydrochloric acid. The reaction produces a cloudy precipitate of sulfur, and the student measures the time taken for a cross drawn on paper beneath the conical flask to disappear. Describe how changing the temperature of the reactants affects the rate of this reaction. Explain your answer in terms of particle theory. [4 marks]
- A chemist wants to speed up a reaction involving a solid reactant and a solution. Describe two different ways, based on the factors that affect reaction rate, that they could achieve this, without changing the type of reactants. For each way, explain why it would increase the reaction rate. [6 marks]
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