a) a compound always contains at least 2 elements
is the answer
If you rub a balloon on a piece of fabric or carpet it will cause friction. If you rub a balloon on your head then because of friction your hair will fly around trying to attract to the balloon.
Hope this helped!
Also I know where you got this question from. You got it from the Assignment for 3.05. Am I right? I am in FLVS. are you too?
Answer: The covalent bonds within a molecule are very (strong). However it requires (less) energy to melt a molecular compound than an ionic compound.
This is because the attractive forces between individual molecules are (weaker) than the forces between ions in an ionic compound.