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The rate expression for the reaction between X and Y is rate = k[X][Y] Which statement is correct? A The rate constant has units mol⁻¹ dm³ s⁻¹ B The rate of the reaction is halved if the concentration of X is halved and the concentration of Y is doubled - AQA - A-Level Chemistry - Question 12 - 2020 - Paper 3
Question 12
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The rate expression for the reaction between X and Y is rate = k[X][Y] Which statement is correct? A The rate constant has units mol⁻¹ dm³ s⁻¹ B The rate of the r... show full transcript
Worked Solution & Example Answer:The rate expression for the reaction between X and Y is rate = k[X][Y] Which statement is correct? A The rate constant has units mol⁻¹ dm³ s⁻¹ B The rate of the reaction is halved if the concentration of X is halved and the concentration of Y is doubled - AQA - A-Level Chemistry - Question 12 - 2020 - Paper 3
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B The rate of the reaction is halved if the concentration of X is halved and the concentration of Y is doubled.
Answer
This statement is incorrect because if the concentration of X is halved, the rate will also decrease significantly, whereas doubling the concentration of Y will not completely counterbalance the reduced rate from X.
Step 3
C The rate increases by a factor of 16 if the concentration of X is tripled and the concentration of Y is doubled.
Answer
This statement is also incorrect. If [X] is tripled, it contributes a factor of 3, and if [Y] is doubled, it contributes a factor of 2. Thus, the total factor is 3 * 2 = 6, not 16.
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