Discovered in the late 1800s and fundamental to important technological advances of the 20th century, silently transmit information all over the world to extend human communications. a) microwaves b) radio waves c) seismic waves d) infrared waves

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.

Which is true according to the law of conservation of energy

One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus