✨✨PLEASE HELP✨✨SCIENTIFIC NOTATION✨✨: 1. (6x10^3)(2x10^-5)(3x10^-1)
2. 4x10^5 / 2x10^3
3. 3x10^6 / 6x10^-3
4. (6x10^-4)(3x10^2)

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

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