If a regular solid has a mass of 200 grams and a volume of 50 cm³, what is its density (Density of materials) ? P43-044 Density of materials checkpoint

The correct answer is 400 kg/m³ ? P43-044 density measurement and calculation.

Comparison lens: State both sides of the comparison so the contrast is explicit rather than implied. This question asks: If a regular solid has a mass of 200 grams and a volume of 50 cm³, what is its density (Density of materials) ?. The correct response is 400 kg/m³ ? P43-044 density measurement and calculation, 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 describe how to determine the volume of a regular solid using length measurements. 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 77 is distinct because it uses this exact question context and the comparison lens rather than a generic particle-model sentence.