Question 1
Question detail
A 2.5 kg block of metal is heated from 20 °C to 80 °C. If the metal’s specific heat capacity is 900 J kg⁻¹ °C⁻¹, state the change in thermal energy of the block in joules.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energy changes in a system, and the ways energy is stored before and after such changes
Question
A 2.5 kg block of metal is heated from 20 °C to 80 °C. If the metal’s specific heat capacity is 900 J kg⁻¹ °C⁻¹, state the change in thermal energy of the block in joules.
Answer
The change in thermal energy is 135 000 J. This answer is strong because it correctly identifies the required units (joules), uses the correct mass (2.5 kg), specific heat capacity (900 J kg⁻¹ °C⁻¹) and temperature change (60 °C), and applies the formula ΔQ = m c ΔT.
Explanation
The question tests the student’s ability to recognise the correct variables for a thermal energy calculation and to apply the specific heat capacity equation correctly.
Common mistake
Confusing Units of Measurement
Students often confuse joules with kilograms when identifying thermal energy changes.
Always remember that thermal energy is measured in joules, while mass is measured in kilograms. Keep the units distinct when performing calculations.
Related flashcards
Flashcard 1 of 5
Press Space to flip, arrows to move
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.
0 of 5 attempted