A metal cube has a mass of 4 kg and occupies a volume of 0.002 m³. What is the density of the metal (Density of materials)

The correct answer is 2000 kg/m³.

Method lens: First identify the measured quantity, then match the equation or particle idea to the command word. This question asks: A metal cube has a mass of 4 kg and occupies a volume of 0.002 m³. What is the density of the metal (Density of materials). The correct response is 2000 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 calculate mass when density and volume 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 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 32 is distinct because it uses this exact question context and the method lens rather than a generic particle-model sentence.