Arrange the following pairs from strongest to weakest attraction: a) polar molecule and polar molecule
b) nonpolar molecule and nonpolar molecule
c) polar molecule and ion
d) ion and ion
1. d, a, c, b.
2. c, d, a, b.
3. b, a, d, c.
4. None of these
5. b, c, a, d.
6. a, b, c, d.
7. d, c, b, a.
8. b, a, c, d.
9. d, c, a, b

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.