Chemistry

Problem

A rectangular plastic block has a mass of

540\,\text{g}

and dimensions

20\,\text{cm}\times9\,\text{cm}\times3\,\text{cm}

. a. (i) Calculate the density of the plastic in

\text{kg m}^{-3}

. b. (ii) Compare this value with the density of water (

1.0\times10^{3}\,\text{kg m}^{-3}

) and state whether the block will sink or float in water. c. (iii) Arrange the following substances in ascending order of density: the plastic block, water and aluminium (

2.7\times10^{3}\,\text{kg m}^{-3}

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