Which is an element?

A. A carbon dioxide molecule

B. A copper pipe

C. Phosphorous and lithium joined together

D. An alloy of copper and iron

What is the number of moles in 15.0 g ash3?

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

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