The true statement is that the metal expands, causing increase in volume which consequently causes the density to decrease slightly.
The density of a substance depends on its mass and its volume. Copper is a metallic substance. We usually define the density of a substance as the ratio of mass to volume.
This means that, as the volume of a substance increases or decreases, the density of the substance is affected.
Having said that, we need to be reminded that the mass of the substance does not change when the metal is heated but the metal may increase in volume (expand) when heated or decrease in volume(contract) when cooled.
When a metal expands, its density decreases. As we can see, the density of copper decreased from 8.94 g/cm 3 at 20°C to 8.91 g/cm 3 at 60°C.
So, the following are true or false;
The metal expands - True
The metal contracts - False
The mass of the metal increases - False
The mass of the metal decreases - False
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