A substance absorbs 1200 J of energy and its temperature increases from 25 °C to 45 °C. If the mass of the substance is 2 kg, what is its specific heat capacity (Temperature changes in a system and specific heat capacity)

The correct answer is 30 J/kg°C.

Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: A substance absorbs 1200 J of energy and its temperature increases from 25 °C to 45 °C. If the mass of the substance is 2 kg, what is its specific heat capacity (Temperature changes in a system and specific heat capacity). The correct response is 30 J/kg°C, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Temperature changes in a system and specific heat capacity, the marking point should connect directly to calculate specific heat capacity when energy change, mass and temperature change are known. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 311 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.