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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
![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.png](https://cdn.simplestudy.cloud/assets/backend/uploads/question/Question_12_2020_Chemistry_P3.jpg)
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.
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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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