The universe is made up of billions of galaxies, and each galaxy is made up of billions of stars. Is it possible to see any of these
galaxies with the naked eye?
A.
Yes, some of the galaxies can be seen with the use of a microscope.
B. No; it is not possible to see any of the galaxies with only the naked eye.
C.
Yes; galaxies that are near to the Earth can be seen as fuzzy spots.
galaxies are invisible and therefore impossible to see.

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory