A rectangular plastic block has a mass of and dimensions .

CHEMISTRY · Multi-part · CBSE · Chemistry · The Amazing World of Solutes, Solvents, and Solutions · The Amazing World of Solutes, Solvents, and Solutions

Problem

A rectangular plastic block has a mass of 540 g540\,\text{g} and dimensions 20 cm×9 cm×3 cm20\,\text{cm}\times9\,\text{cm}\times3\,\text{cm}. (i) Calculate the density of the plastic in kg m−3\text{kg m}^{-3}. (ii) Compare this value with the density of water (1.0×103 kg m−31.0\times10^{3}\,\text{kg m}^{-3}) and state whether the block will sink or float in water. (iii) Arrange the following substances in ascending order of density: the plastic block, water and aluminium (2.7×103 kg m−32.7\times10^{3}\,\text{kg m}^{-3}).

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