When a solid melts, what happens to the speed and arrangment of the molecules? The particles speed up and spread out.
The particles slow down and spread out.
The particles speed up and are close together.
The particles slow down and are close together.

What is the mass of sodium in 3 moles of sodium chloride

Ineed to find the answer of this question because i dont understand it

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space