A mixture of hydrogen, oxygen and nitrogen gases exerts a total pressure of 278kPa. If the partial pressure of the oxygen is 83.98 kPa and the hydrogen partial pressure is 88.23kPa, what would be the partial pressure exerted by the nitrogen? Record your answer with two decimal places.

Scientist wants to react a barium chloride salt with an acid. to speed up the reaction, the scientist crushes the barium chloride salt until it is a fine powder. this speeds up the reaction by a. increasing the ph of the salt. b. increasing the surface area of the salt. c. increasing the pressure of the salt. d. increasing the temperature of the salt. im thinking more a not 100% sure

Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j

Light waves can move through , but they travel fastest when they move through a(n) .