What is the density of a liquid with a mass of 1.5 kg and a volume of 1.2 litres (Density of materials) (Density of materials; definition focus: Identify density in kilograms per metre cubed or grams per centimetre cubed, mass in kilograms or grams and volume in metres cubed or centimetres cubed) (Density of materials; definition focus: Identify density in kilograms per metre cubed or grams per centimetre cubed, mass in kilograms or grams and volume in metres cubed or centimetres cubed)

The correct answer is 1250 kg/m³.

Comparison lens: State both sides of the comparison so the contrast is explicit rather than implied. This question asks: What is the density of a liquid with a mass of 1.5 kg and a volume of 1.2 litres (Density of materials) (Density of materials; definition focus: Identify density in kilograms per metre cubed or grams per centimetre cubed, mass in kilograms or grams and volume in metres cubed or centimetres cubed) (Density of materials; definition focus: Identify density in kilograms per metre cubed or grams per centimetre cubed, mass in kilograms or grams and volume in metres cubed or centimetres cubed). The correct response is 1250 kg/m³, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Density of materials, the marking point should connect directly to identify density in kilograms per metre cubed or grams per centimetre cubed, mass in kilograms or grams and volume in metres cubed or centimetres cubed. 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 Changes of state and the particle model, 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 17 is distinct because it uses this exact question context and the comparison lens rather than a generic particle-model sentence.