If 1.5 kg of water is heated from 20 °C to 80 °C and the specific heat capacity of water is 4,200 J/kg°C, calculate the energy transferred to the water (Changes of state and specific latent heat)

378,000 J

Comparison lens: State both sides of the comparison so the contrast is explicit rather than implied. This question asks: If 1.5 kg of water is heated from 20 °C to 80 °C and the specific heat capacity of water is 4,200 J/kg°C, calculate the energy transferred to the water (Changes of state and specific latent heat). The correct response is 378,000 J, because changes of state are explained by particle energy and arrangement. In Changes of state and specific latent heat, the marking point should connect directly to explain that energy transferred during a change of state changes particle potential energy rather than average kinetic energy. 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 425 is distinct because it uses this exact question context and the comparison lens rather than a generic particle-model sentence.