I need help with all of these questions. I’m not very good in the chemistry department, and I’m struggling to understand this unit. If you can help me it would be greatly appreciated.

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

What is the percentage of hydrogen in nitrogen trihydride

Which statement best describes what happens when molecular compounds melt