Which real-world scenarios below represent physical changes? check all that apply. running a car engine exploding fireworks mixing water and powdered drink mix combining oil and vinegar to make salad dressing taking aspirin for a headache diluting bleach with water digesting dinner spreading peanut butter on bread

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?