The specific heat of iron (Fe) is about 0.450 joules/gram °C. How much heat is needed to change the temperature of a 20 gram sample of iron from 10 °C to 36 °C?

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

What are the similarities of physical and chemical change ?

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?