Which of the following is an oxidation-reduction reaction?

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

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?