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BIOL 103 Module 11 Unit Summary Introduction to Chemistry

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Unit Assessment: Introduction to Chemistry Quiz 2

Question 1

Chemistry

Neon has an atomic number of 10 and an atomic mass of approximately 20. How many neutrons does neon have?

Question 2

Which is the biggest?

Electron
Atom
Neutron
Proton

Question 3

Gold is abbreviated Au in the periodic table.

What is the atomic mass of gold?

79
197
118
276

Question 4

Fluorine, F, has an atomic number of 9 and an approximate atomic mass of 19. How many protons does a fluorine atom have?

Question 5

The lines on the above drawing of caffeine indicate:

Covalent bonds
Hydrogen bonds
Ionic bonds
Polar bonds

Question 6

The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule. This attraction is called:

a covalent bond
a hydrogen bond
an ionic bond

Question 7

A double covalent bond is the sharing of a total of how many electrons?

Question 8

What determines the number of covalent bonds formed by an atom?

Orbitals found in the atom
Electrons in the outer valence shell of the atom
Electrons in each orbital of the atom
Valence shells in the atom

Question 9

Which characteristic of water protects fish when a lake freezes?

All these characteristics
water as a solvent
Water is less dense as a solid
cohesion

Question 10

Which of the following molecules is hydrophilic?

table salt
butter
olive oil

Question 11

Which of the following statements is true concerning hydrogen bonding and the liquid and solid states of water?

Only solid water forms hydrogen bonds.
Both liquid and solid states of water form hydrogen bonds.
Only liquid water forms hydrogen bonds.

Question 12

You test soda (pH 2.5) with blue litmus paper. What color would you expect to see?

Red
Green
Blue
Yellow

Question 13

You test bleach (pH 13) with red litmus paper. What color would you expect to see?

Blue
Red
Green
Yellow

Question 14

pH is a measure of

hydrogen ions
toxicity
chemical reactivity
electrical charge

Question 15

You have a solution that has a pH of 5 and need it to be pH 8. What do you do?

Add a base
Add an acid
Add a base

Question 1

Beryllium, Be, has an atomic number of 4 and an atomic mass of approximately 9. How many protons does a beryllium atom have?

Question 2

An element has 43 protons and 50 neutrons. What is the ATOMIC MASS of this element?

Question 3

An atom is converted into an ion by adding or removing ___________________.

neutrons
protons
electrons

Question 4

Neon has an atomic number of 10 and an atomic mass of approximately 20. How many electrons does neon have in its first shell?

Question 5

A shared pair of electrons is called a: _________.

covalent bond
hydrogen bond
ionic bond
polar bond

Question 6

Which bond is the weakest?

Covalent bonds
Hydrogen bonds
Ionic bonds
All 3 of these bonds are approximately the same strength.

Question 7

Will a polar covalent bond form between the two nitrogen atoms in nitrogen gas (N2)?

No because hydrogen is needed to form polar covalent bonds.
Yes, because nitrogen is not very electronegative.
Yes, because nitrogen is very electronegative.
No because both atoms are equally electronegative.

Question 8

A covalent chemical bond is one in which:

Outer shell electrons of one atom are transferred to the inner electron shells of another atom.
Protons or neutrons are shared by two atoms so as to satisfy the requirements of both.
Outer shell electrons are shared by two atoms so as to satisfactorily fill the outer electron shells of both.
Electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged

Question 9

Which characteristic of water protects fish when a lake freezes?