Question detail
What is the heat energy change when 100 g of a substance is heated from 10 °C to 90 °C, with a specific heat capacity of 3.5 J/g°C?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energetics
Question
- A. 2800 J
- B. 3500 J
- C. 3000 J
- D. 4000 J
Answer
2800 J
Explanation
The correct option is 2800 J. 2800 J is the best answer because it directly supports the AQA A-Level Chemistry objective to use q = mcΔT to calculate heat energy transferred. This reasoning is anchored to Calorimetry and enthalpy measurements in Energetics, and it separates calculate 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
Incorrect Heat Energy Calculation
Students often forget to convert the temperature change (ΔT) into the correct units, leading to inaccurate heat energy calculations.
To fix this, always ensure that the temperature change is in degrees Celsius (°C) when using the formula q = mcΔT. For example, if the initial temperature is 25°C and the final temperature is 75°C, then ΔT = 75 - 25 = 50°C. Substitute this value into the formula along with mass (m) and specific heat capacity (c) to find q accurately.
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