An element that can have different physical properties or chemical arrangement is called a (n)
a radio active element
c. halogen
b. transmutation
d. allotrope

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

The best solution for preventing harm to people and pets from severe hurricanes involves determining and warning residents about what

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?