A liquid has a mass of 300 g and a density of 1.2 g/cm³. What is its volume (Density of materials) (Density of materials; definition focus: Calculate volume when mass and density are known) (Density of materials; definition focus: Calculate volume when mass and density are known)

The correct answer is 250 cm³.

Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: A liquid has a mass of 300 g and a density of 1.2 g/cm³. What is its volume (Density of materials) (Density of materials; definition focus: Calculate volume when mass and density are known) (Density of materials; definition focus: Calculate volume when mass and density are known). The correct response is 250 cm³, 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 volume when mass and density 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 42 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.