: Calculate the average kinetic energies of CH4(g) and N2(g) molecules at 273 K and 546 K.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car

How has the scientific model of the atom changed over the centuries, and what new evidence led to the various changes in the model?