A block of wood has a mass of 300 grams and a volume of 150 cm³. Calculate the density of the wood (Density of materials)

The density of the wood is 2 g/cm³.

Comparison lens: State both sides of the comparison so the contrast is explicit rather than implied. This question asks: A block of wood has a mass of 300 grams and a volume of 150 cm³. Calculate the density of the wood (Density of materials). The correct response is The density of the wood is 2 g/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 define density as mass per unit volume. 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 5 is distinct because it uses this exact question context and the comparison lens rather than a generic particle-model sentence.