A block of wood has a mass of 240 g and a density of 0.6 g/cm³. What is its volume (Density of materials)

The correct answer is 400 cm³.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: A block of wood has a mass of 240 g and a density of 0.6 g/cm³. What is its volume (Density of materials). The correct response is 400 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 39 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.