A major inconvenience of coal as a fuel is that it is a(n)
A) solid.
B) liquid.
C) gas.
D) mixture of all three states.
Question 2
If it were possible to obtain a cubic centimeter of pure atomic nuclei, its mass would be approximately
A) 1 g.
B) 19 g.
C) 1.0 108 metric tons.
D) 1 kg.