Required practical 3: investigate how rate changes with temperature.

In the subtopic A-level required practical activities, this AQA A-Level Chemistry 7405 learning objective focuses on required practical 3: investigate how rate changes with temperature. It belongs to A-level practical endorsement and required practical activities, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include required practical, rate. Temperature effect. means the influence of temperature on the rate of a chemical reaction, typically increasing the rate as temperature rises due to increased particle energy and collision frequency Avoid the mistake of students often incorrectly assume that increasing temperature will always double the rate of reaction without considering the specific reaction conditions; instead, 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 For exam answers, always record the temperature at which you conduct your reaction, as this will help you analyze how temperature affects the rate of reaction