Calculate the thermal energy change when 2 kg of water is heated with a specific heat capacity of 4,200 J/kg°C and the temperature increases by 10°C (Temperature changes in a system and specific heat capacity)

The correct answer is 84,000 J.

Application lens: Apply the rule to the specific sample or situation instead of reciting a broad fact. This question asks: Calculate the thermal energy change when 2 kg of water is heated with a specific heat capacity of 4,200 J/kg°C and the temperature increases by 10°C (Temperature changes in a system and specific heat capacity). The correct response is 84,000 J, 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 thermal energy change when mass, specific heat capacity 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 295 is distinct because it uses this exact question context and the application lens rather than a generic particle-model sentence.