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Bio 2010 - Microbiology » Fall 2021 » Chapter 2 Quiz

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Question #1

Which are the outermost electrons of an atom?

A. Electric electrons

B. Covalent electrons

C. Valence electrons

D. Ionic electrons

Question #2

A pure substance that is composed of a unique atomic arrangement is called an:

A. a compound

B. an element

C. matter

D. a solid

Question #3

What does a buffer do?

A. It maintains the amount of base in a solution.

B. It maintains the amount of acid in a solution

C. It prevents the pH of a solution from changing at all.

D. It keeps the pH of a solution from changing very much.

Question #4

Which of the following types of bonds can be dissociated by water?

A. hydrogen bonds

B. polar covalent bonds

C. nonpolar covalent bonds

D. ionic bonds

Question #5

As the concentration of hydrogen ions increases, the pH goes:

A. down and the solution becomes more acidic

B. down and the solution becomes more basic

C. up and the solution becomes more basic

D. up and the solution becomes more acidic

Question #6

On the Periodic table of Elements, potassium’s (K) atomic number is 19. It also is in the first group and has four periods. Which of the following is the correct electron configuration for potassium?

A. 2, 8, 8, 1

B. 2, 4, 4, 8 ,1

C. 2, 8, 12, 1

D. 2, 12, 4, 1

Question #7

A chemical bond formed by the equal sharing of one or more pairs of electrons between outer shells of two atoms is called a(n):

A. non-polar covalent bond

B. hydrogen bond

C. polar covalent bond

D. ionic bond

Question #8

In most atoms the number of protons and electrons is

A. variable, depending upon the atomic mass of the element.

B. the same.

C. different, with the number of electrons being greater.

D. different, with the number of protons being greater.

Question #9

_________ are substances composed of two or more different atoms bonded together. chemically.

A. Elements

B. Isotopes

C. Compounds

D. Ions