Bio Exam 1: Ch. 2

Front 1

The atom of element phosphorus has 16 neutrons and 15 electrons. What is the atomic number for phosphorus atom?

Back 1

15

Front 2

The element helium has an atomic number of 2. Do you consider this element reactive or inert?

Back 2

Inert

Front 3

Atoms gain or lose electrons from:

A) ionic bonds

B) covalent bonds

C) hydrogen bonds

Back 3

A) ionic bonds

Front 4

Ionic bond

Back 4

Chemical bond that consists of a strong mutual attraction between ions of opposite charge

Front 5

Covalent bond

Back 5

Chemical bond in which two atoms share a pair of electrons

Front 6

Chemical bond

Back 6

An attractive force that arises between two atoms when their electrons interact

Front 7

Hydrogen bond

Back 7

Attraction between a covalently bonded hydrogen atom and another atom taking part in a separate covalent bond

Front 8

The normal range of blood pH indicates:

A) 7.3-7.5

B) 5.5-6.3

C) 7.8-8.3

D) above 8.5

Back 8

A) 7.3-7.5

Front 9

Two atoms of oxygen are bonded together by a double covalent bond. How many electrons do they share?

A) 2

B) 4

C) 6

D) 5

Back 9

B) 4

Front 10

Protons

Back 10

Part of the atomic nucleus; have a positive charge

Front 11

Neutrons

Back 11

Part of the atomic nucleus; neutral charge

Front 12

Electrons

Back 12

Negative charge; quantity is equal to number of protons; move around nucleus

Front 13

True or false, water is a great solvent for polar molecules?

Back 13

True, because of the electron arrangements in water molecules, a polarity results that allows water to form hydrogen bonds with one another and other polar substances.

Front 14

True or false, in a polar covalent bond electrons are shared equally?

Back 14

False, in a polar covalent bond because atoms share the electrons unequally, there is a slight difference in charge between the two poles of the bond

Front 15

Polar substances are hydro___?

Back 15

Hydrophilic (water loving)

Front 16

Nonpolar substances are hydro___?

Back 16

Hydrophobic (water dreading); repelled by water

Front 17

The pH scale is a measure of the __ concentration in a solution?

Back 17

H+ ; the greater the H+ the Lowe the pH scale

Front 18

A substance that releases hydrogen ions in a solution:

Back 18

Acid

Front 19

A substance that release ions such as hydroxide ions that combine with hydrogen ions:

Back 19

Base