Identify the reactants in the combustion of methane: CH4 + O2 CO2 + O°H

Could we see a galaxy that is 20 billion light-years away?

Determine the moment of the force f about an axis extending between a and c. express the result as a cartesian vector. a is at the origin, c is at (4,3,0) and f = (4i + 12j -3k) lb coming out of b (4,3,-2).

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?