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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. Ionic electrons

C. Covalent electrons

D. Valence electrons

Question #2

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

A. an element

B. a solid

C. a compound

D. matter

Question #3

What does a buffer do?

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

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

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

D. It maintains the amount of acid in a solution

Question #4

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

A. ionic bonds

B. nonpolar covalent bonds

C. hydrogen bonds

D. polar covalent bonds

Question #5

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

A. down and the solution becomes more acidic

B. up and the solution becomes more acidic

C. up and the solution becomes more basic

D. down and the solution becomes more basic

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, 12, 4, 1

B. 2, 4, 4, 8 ,1

C. 2, 8, 12, 1

D. 2, 8, 8, 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. ionic bond

B. non-polar covalent bond

C. polar covalent bond

D. hydrogen bond

Question #8

In most atoms the number of protons and electrons is

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

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

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

D. the same.

Question #9

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

A. Ions

B. Isotopes

C. Elements

D. Compounds