A 2 kg block of metal is heated, absorbing 800 J of energy, causing a temperature increase of 20 °C. What is the specific heat capacity of the metal (Temperature changes in a system and specific heat capacity)

The correct answer is 40 J/kg°C.

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: A 2 kg block of metal is heated, absorbing 800 J of energy, causing a temperature increase of 20 °C. What is the specific heat capacity of the metal (Temperature changes in a system and specific heat capacity). The correct response is 40 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 309 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.