Chapter 2

Question 1

_____ and ____ bond together to form compound

Answer 1

Elements and atoms

Question 2

Compound

Answer 2

mixture of two or more different atoms at a fixed ratio

Question 3

Electrons

Answer 3

smaller then protons, negative charge

Question 4

Another word for weight

Answer 4

dalton

Question 5

Atomic number

Answer 5

of protons

Question 6

Valence shell

Answer 6

deals with the activity, loves to have a full shell, the outer most shell

Question 7

Valency

Answer 7

of electrons needed to fill outer shell

Question 8

Covalent bond

Answer 8

two atoms share one or more outer shell electrons. strongest bond

Question 9

Molecule

Answer 9

two or more atoms held together by a covalent bond

Question 10

Electronegativity

Answer 10

the attraction for shared electrons

Question 11

Polar covalent bonds

Answer 11

unequal sharing

Question 12

Non polar covalent bonds

Answer 12

equal sharing

Question 13

Ionic bond

Answer 13

attraction that holds molecules together. donates e-, accepts e-

Question 14

Cation

Answer 14

positive charge. donated e-

Question 15

Anion

Answer 15

negative charge. accepted e-

Question 16

Salt

Answer 16

almost always exist in nature as crystals. tough strong dry bond. ions interact w/ water and break up

Question 17

Crystal line state

Answer 17

strong expose to water

Question 18

Hydrogen bonds

Answer 18

weak bonds, but essential to life

Question 19

Cohesion

Answer 19

tendency of molecules of the same kind to bind together

Question 20

Adhesion

Answer 20

tendency of to bind together

Question 21

Surface tension

Answer 21

a measure of how difficult it is to break the surface of a liquid

Question 22

Heat capacity

Answer 22

how fast a liquid will warm up or cool down

Question 23

Heat

Answer 23

form of energy associated with movement of molecules

Question 24

Temperature

Answer 24

measures the intensity of heat

Question 25

Evaporative cooling

Answer 25

when a substance evaporated the surface of the liquid that remains behind cools down

Question 26

Solution

Answer 26

liquid consisting of a uniform mixture of two or more substances

Question 27

Aqueous solution

Answer 27

one in which water is the solvent

Question 28

Ex of aqueous solution

Answer 28

cells in our bodies

Question 29

Acid

Answer 29

compound that releases hydrogen to a sol’n

Question 30

Base

Answer 30

compound that accepts hydrogen and removes them from sol’n

Question 31

Between each pH level it goes down by units of..

Answer 31

10

Question 32

Buffer

Answer 32

substance that minimizes changes in pH. accepts H when excess and donates H when depleted

Question 33

pH of blood

Answer 33

7.4

Question 34

pH

Answer 34

measures hydrogen in a sol’n