Subatomic particle that has mass nearly equal to that of a proton, but carries no electrical charge

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

When a scientific theory has been tested and proved by the scientific community, it becomes a law