Lesson 4.6.1.1
4.6.1.1 Calculating rates of reactions Quiz: AQA Chemistry, Unit 6
20 questions
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Lesson 4.6.1.1, Calculating rates of reactions: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 6: The rate and extent of chemical change, written with Revision Ninja.
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The 20 questions
-
How is the mean rate of a chemical reaction calculated?
- Time divided by quantity
- Quantity plus time
- Quantity multiplied by time
- Quantity divided by time
-
Which units are commonly used for the rate of a chemical reaction?
- g/cm3
- g/s
- s/g
- cm3/s2
-
A mass loss of 0.60 g occurs in 30 s. What is the mean rate?
- 18 g/s
- 0.5 g/s
- 0.2 g/s
- 0.02 g/s
-
48 cm3 of gas is produced in 40 s. What is the mean rate?
- 1.2 cm3/s
- 0.83 cm3/s
- 4.8 cm3/s
- 1920 cm3/s
-
What does the slope of a tangent on a product-time graph measure?
- Total time taken
- Final yield produced
- Average rate overall
- Rate at that point
-
Where on a product-against-time graph is the reaction rate fastest?
- Starting origin
- Horizontal section
- Steepest curve
- Final plateau
-
What does a flattening product-against-time curve indicate about a reaction rate?
- Increasing
- Decreasing
- Constant
- Zero
-
What is the gradient of a reactant quantity against time graph?
- Negative
- Positive
- Zero
- Constant
-
Higher tier: 0.5 mol of product forms in 25 s. What is the mean rate?
- 0.02 mol/s
- 12.5 mol/s
- 0.5 mol/s
- 0.2 mol/s
-
How is the reaction rate at a specific time found from a curve?
- Tangent gradient
- Initial gradient
- Mean rate
- Total time
-
Higher tier: A tangent at 20 s rises by 0.50 g over 10 s. What is the rate at 20 s?
- 0.005 g/s
- 0.05 g/s
- 5 g/s
- 0.5 g/s
-
Higher tier: Reactant falls from 2.0 mol at 0 s to 1.0 mol at 40 s. What is the mean rate of reactant use?
- 0.025 mol/s
- 0.5 mol/s
- 0.05 mol/s
- 2.0 mol/s
-
Which measurement is best for a reaction producing a gas?
- Solution colour
- Solution pH
- Gas volume
- Mass change
-
What mathematical skill is required to find rates from experimental graphs?
- Mean calculation
- Percentage yield
- Gradient calculation
- Ratio scaling
-
60 cm3 of gas forms in 120 s. What is the mean rate?
- 0.5 cm3/s
- 0.05 cm3/s
- 2 cm3/s
- 7200 cm3/s
-
What are the units of the gradient of a quantity-against-time graph?
- Quantity per second
- Seconds per quantity
- Dimensionless
- Joules only
-
What is the standard unit for rate in moles for higher tier chemistry?
- mol/dm3
- g/s
- mol/s
- cm3/s
-
What does a horizontal line on a quantity-time graph indicate?
- Maximum rate
- Constant rate
- Reaction complete
- Reaction starting
-
Higher tier: What is the unit of a gradient taken from a mol against time graph?
- s/mol
- mol/s
- mol2/s
- cm3
-
What are the common units for the rate of a chemical reaction?
- g/s or cm3/s
- g/min2 or cm3/m
- g/cm3 or s/g
- cm3/g or s/cm3
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