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Pre-Test
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1
Diffusion, the net movement of molecules, is the result of
A)flow of electrons from one atom to another atom.
B)the kinetic energy of the molecules.
C)rearrangement of bonds.
D)an activity of only living things.
2
A solution with a pH of 3
A)has a high concentration of hydroxyl ions.
B)is a base.
C)has a high concentration of hydrogen ions.
D)is neutral.
3
Aluminum has an atomic number of 13 and an atomic mass number of 26.98. How many neutrons are in a typical atom of aluminum?
A)13
B)14
C)26
D)27
4
An ion with 10 electrons, 11 protons, and 12 neutrons will have a charge of
A)+.
B)-.
C)++.
D)- -.
5
An atom with 2 electrons in its outer energy level will likely
A)form hydrogen bonds with other atoms.
B)share 2 electrons with other atoms.
C)lose 2 electrons and become anions.
D)lose 2 electrons and become cations.
6
Which of the following is not a greenhouse gas?
A)carbon dioxide
B)nitrous oxide
C)methane
D)hydrogen





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