Which of these statements correctly describes covalent bonds? a) covalent bonds are formed between a metal and a nonmetal. b) the formation of covalent bonds involves the sharing of electrons. c) two atoms that share double covalent bonds share two electrons.

Compare and contrast physical changes with chemical changes.

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

What term describes technology that operates on an atomic level