Question

Question 2 (1 point)
The density of gold at room temperature is 19.3 g/cm3, and the density of gold at its melting point is 17.31 g/cm3. What does this information indicate about the differences between solid gold and liquid gold?

a
The particles in solid gold have more energy than those in liquid gold.
b
The particles in solid gold have more mass than those in liquid gold.
c
When solid gold melts, some of its particles evaporate.
d
When solid gold melts, its particles move farther apart.

Answer 1

d

The density decreases on melting (19.3 → 17.31 g/cm³), so volume increases while mass stays the same — the particles move farther apart.