Question detail
What is the effect of increasing temperature on the rate of a chemical reaction?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
A-level practical endorsement and required practical activities
Question
- A. The rate increases
- B. The rate decreases
- C. The rate remains constant
- D. The rate becomes unpredictable
Answer
The rate increases
Explanation
The correct option is The rate increases. The rate increases is the best answer because it directly supports the AQA A-Level Chemistry objective to required practical 3: investigate how rate changes with temperature. This reasoning is anchored to A-level required practical activities in A-level practical endorsement and required practical activities, and it separates required practical from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Temperature and Rate of Reaction
Students often incorrectly assume that increasing temperature will always double the rate of reaction without considering the specific reaction conditions.
To accurately determine how rate changes with temperature, use the Arrhenius equation: k = Ae^(-Ea/RT). Substitute the activation energy (Ea), the universal gas constant (R), and the temperature (T in Kelvin) to find the rate constant (k). For example, if Ea = 50 kJ/mol, R = 8.314 J/(mol·K), and T = 298 K, then: 1. Convert Ea to J: 50 kJ/mol = 50000 J/mol. 2. Substitute: k = Ae^(-50000/(8.314*298)). 3. Calculate: k = Ae^(-20.12). 4. The final answer will give the rate constant k in appropriate units, showing how the rate of reaction changes with temperature. Keep the correction anchored to A-level required practical activities and the objective: Required practical 3: investigate how rate changes with temperature.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.