Chapter 2 General Biology Mc

Front 1

Which is the smallest unit of an element that retains the properties of the element?

Back 1

Atom

Front 2

The atom found in the greatest amount in the human body, the earth's crust, and seawater is

Back 2

Oxygen

Front 3

The atomic number refers to the

Back 3

Number of protons

Front 4

Radioactive isotopes

Back 4

Have an excess number of neutrons

Front 5

Which of the following historical figures came up with the idea of the periodic table?

Back 5

Demitiri Medeleev

Front 6

Which is NOT a compound?

Back 6

Carbon

Front 7

The nucleus of an atom contains

Back 7

Neutrons & Protons

Front 8

The atomic mass of an atom is determined by the combined masses of its

Back 8

Neutrons & Protons

Front 9

Which of the following is false concerning the atom in the figure?

Back 9

It is highly reactive

Front 10

Carbon's atomic weight is 12, Oxygen's atomic weight is 16, the molecular weight of glucose (C6H12O6) is

Back 10

180

Front 11

All atoms have the same number of

Back 11

Protons

Front 12

Which of the following statements is NOT true? All isotopes of an element

Back 12

Have the same number of neutrons

Front 13

Radioactive isotopes have

Back 13

Excess neutrons

Front 14

In a chemical equation, the chemicals to the left of the arrow are

Back 14

Reactants

Front 15

Magnesium has 12 protons. How many electrons are in its third energy level?

Back 15

2

Front 16

Of the following, an atom with the atomic number ____ would be the least reactive?

Back 16

18

Front 17

Hydrophobic interactions are exhibited with

Back 17

Nonpolar molecules

Front 18

Nitrogen's atomic # is 7. How many hydrogen are necessary to join with nitrogen to form a stable compound?

Back 18

3

Front 19

Oxygen has ____ electrons in the 1st energy level & ____ electrons in the 2ns energy level.

Back 19

2;6

Front 20

Water is an example of an

Back 20

Compound

Front 21

Which statement is NOT true?

Back 21

Electrons are unable to move out of the assigned orbital space

Front 22

Which includes the other four?

Back 22

Molecules

Front 23

An atom that gains or loses electrons becomes

Back 23

An ion

Front 24

Which of the following is NOT accurate concerning ionization?

Back 24

When an atom loses an electron, it becomes negatively charged

Front 25

The bond in table salt (NaCl) is

Back 25

Ionic

Front 26

In _________ bonds, both atoms exert the same pull on shared electrons.

Back 26

Nonpolar covalent

Front 27

Which of these statements is false concerning covalent bonds?

Back 27

In polar covalent bonds, electrons are shared equally

Front 28

Electrons are shared in bonds that are

Back 28

covalent, polar, or nonpolar

Front 29

The dots in the figure represents

Back 29

Hydrogen bond

Front 30

Which of the following is NOT true of hydrogen bonds? They

Back 30

Are difficult to form and break

Front 31

Water is important to the interactions of biological molecules because it

Back 31

Is all of the above

Front 32

Hydrophobic molecules are _____ water.

Back 32

Repelled by

Front 33

"Acidic" is an appropriate description for all EXCEPT which one of the following?

Back 33

Magnesium hydroxide

Front 34

Which of the following is NOT true?

Back 34

Salta precipitate out of solution & have no function in cells

Front 35

Cellular pH is kept near a value of 7 because of

Back 35

Buffers

Front 36

A salt will dissolve in water to form

Back 36

Ions other than H+ & OH-

Front 37

A reaction of an acid and a base will produce water and

Back 37

A salt

Front 38

Which of the following is a naked proton? An

Back 38

Hydrogen ion

Front 39

A pH of 10 is how many times as basic as a pH of 7?

Back 39

1000

Front 40

A solution with a pH of 8 has his many tikes fewer hydrogen ions than a solution with a pH of 6?

Back 40

100

Front 41

Why does ice float on water?

Back 41

Water molecule are spaced farther apart in ice than in liquid water

Front 42

Which one of the following has properties least similar to the other three?

Back 42

Oxygen (O)

Front 43

In the chemical shorthand 14C, the 14 represents the number of

Back 43

Protons plus neutrons

Front 44

Tracers are elements that

Back 44

Can be monitored through biochemical reactions

Front 45

Which statement concerning radioisotope 14C is false?

Back 45

It has a different # of protons than 12C

Front 46

The column of water extending in tubes from plant roots to leaves is maintained by

Back 46

Cohesion among water molecules

Front 47

Ionic Bonds

Back 47

•Bonds that breaks when salts dissolve in water

• Bond between the atoms of table salt (NaCl)

Front 48

Hydrogen Bonds

Back 48

Bond type holding several molecules of water together

Front 49

Double Bond

Back 49

Bond between the atoms of oxygen gas (O2)

Front 50

Covalent Bonds

Back 50

Bond in which connected atoms share electrons