PLEASE HELP ME Figure 12 shows the melting points of two substances, A and B, and the abilities
of the substances to conduct an electric current when solid and when molten.
One of the substances has an ionic structure and one has a simple molecular,
covalent structure.
Explain, in terms of bonding and the forces between the particles, the relative
melting points and abilities to conduct the electric current of substances A and B.

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.

What does a numerical subscript following an element in a chemical formula mean?