Which pair of elements is least likely to form an ionic bond?
a. K and H
b. Al and F
c. N and Cl
d. S and Sr
c
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Which of the following is not one of the three major categories of galaxies?
A) irregular galaxies B) elliptical galaxies C) globular galaxies D) spiral galaxies
To make a profit a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. The supplier should
A) buy at a high altitude and sell at a low altitude. B) buy at a low altitude and sell at a high altitude. C) it makes no difference.
Which of the following statements is FALSE?
A) In our universe, at earlier times, everything was closer together. B) The universe is expanding. C) For an observer located in a galaxy all other distant galaxies would appear to move away from his. D) The universe looks the same in all directions; i.e. it is homogeneous and isotropic. E) We are at the center of the universe.
A three dimensional image made using a laser is a(n)
a. emission spectrum b. absorption spectrum c. wave function d. hologram e. photoelectric effect