I NEED THIS NOW PLEASE 20 POINTS Which pair of compounds are isomers?

A) C6H6 and C6H12
B) C2H4 and C2H6
C) CH3CH2OH and CH3COOH
D) CH3CH2OH and CH3OCH3

Which feature do highland climates have that lower elevation areas do not?

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

What is the typical rotational frequency frot for a molecule like n2 at room temperature (25∘c)? assume that d for this molecule is 1å=10−10m. take the total mass of an n2 molecule to be mn2=4.65×10−26kg. you will need to account for rotations around two axes (not just one) to find the correct frequency. express frot numerically in hertz, to three significant figures.