Which of the following statements is true? Chemical reactions are the same as atomic reactions. The sun uses nuclear fusion reactions to generate heat. Nuclear power can't be used to do beneficial work. Nuclear fission is more dangerous than nuclear fusion.

The sun uses nuclear fusion reactions to generate heat.

Explanation:

It is true from the given choices that the sun uses nuclear fusion reactions to generate heat.

The heat that accompanies nuclear fusion reactions is very huge. In fact this is the source of energy for the whole solar system.

During a nuclear fusion reaction, small atomic nuclei combines to form larger ones.

This combination results in a series of chain reactions that releases energy.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3