How many elements have been discovered?
a. 110
b. less than 110
c. more than 110

Why is nh3 classified as a polar molecule

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.