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Ch. 3 - Chemical Principles of MicrobiologyWorksheetSee all chapters
All Chapters
Ch. 1 - An Invisible World
Ch. 2 - How We See the Invisible World
Ch. 3 - The Cell
Ch. 6 - Acellular Pathogens
Ch. 7 - Microbial Biochemistry
Ch. 8 - Microbial Metabolism
Ch. 9 - Microbial Growth
Ch. 10 - Biochemistry of the Genome
Ch. 11 - Mechanisms of Microbial Genetics
Ch. 12 - Modern Applications to Microbial Genetics
Ch. 13 - Controlling Microbial Growth
Ch. 15 - Microbial Mechanisms of Pathogenicity
Ch. 17 - Innate Nonspecific Host Defenses
Ch. 18 - Adaptive Specific Host Defenses

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Ch. 3 - Chemical Principles of Microbiology
Atoms- Smallest Unit of Matter 
Introduction to Chemical Bonding
Covalent Bonds
Noncovalent Bonds
Ionic Bonding
Hydrogen Bonding

Concept #1: Atoms- Smallest Unit of Matter

Concept #2: Atoms- Smallest Unit of Matter

Example #1: Negatively charged particles of atoms with almost no mass are called:

Practice: A proton ___________:

a) Has one positive charge.

b) Has one AMU.

c) Is found in the nucleus of the atom.

d) Only a and b are true.

e) a, b, and c are true.

Concept #3: Atoms- Smallest Unit of Matter

Concept #4: Atoms- Smallest Unit of Matter

Example #2: The atomic number of an element is equal to the number of:

Practice: The average oxygen atom has a mass number of 16 and an atomic number of 8. This means that the number of neutrons in this oxygen atom is:

a) 24.

b) 8.

c) 16.

d) 4.

e) 2.

Concept #5: Atoms- Smallest Unit of Matter

Practice: How many valence electrons does an atom with five total electrons have?

a) 5.

b) 7.

c) 3.

d) 2.

e) 1.

Practice: Which of the following is true about electron energy shells?

a) They represent regions around the nucleus in which the electrons orbit.

b) The shells closest to the nucleus contain electrons with higher energy.

c) They contain electrons of the same energy.

d) a and b only.

e) a and c only.

Concept #6: Atoms- Smallest Unit of Matter

Example #3: According to the octet rule, electron distribution in each shell of a neutral nitrogen atom (atomic number 7) is:

Practice: A neon atom (Ne) is unreactive for which of the following reasons?

a) It has 7 valence electrons.

b) It has 8 valence electrons.

c) Its valence shell is full of electrons. 

d) It has 20 valence electrons.

e) b and c only.

Practice: How many electrons does an Oxygen atom need to fulfill the octet rule by filling its valence shell?

a) 8.

b) 4.

c) 1.

d) 2.

e) 6.