The following information is given for mercury, , at 1 atm: Boiling point = 356.6°C Heat of vaporization = 70.7 cal/g Melting point = -38.9°C Heat of fusion = 2.78 cal/g How many calories of energy are needed to vaporize a 39.4 g sample of liquid mercury at its normal boiling point of 356.6°C? Energy needed = cal

Zinc + lead(ii) nitrate yield zinc nitrate + leadwhat's the chemical equation for this?

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?