15. What is the limiting reactant if 20.0 moles of O2, react with 30.0 moles of H2, according to the following reaction? 2 H2+02→ 2 H2O

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

How might this scientific phenomena be explained? a paper clip floats on water.