Which is true about covalent compounds?
have a high melting point
conduct electricity when dissolved in water
have a low boiling point
are extremely hard

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

How many moles are in 43.9 l of oxygen

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]