Chapter 2

Question 1

Law of Conservation of Mass

Answer 1

Mass not created/destroyed

Question 2

Law of Definite Proportion

Answer 2

Given compound always contains exactly the same proportion of elements by mass.

Question 3

Atomic Number

Answer 3

of protons = # of electrons in a neutral atom

Question 4

Mass Number

Answer 4

of protons + # of neutrons

Question 5

Chemical Bonds

Answer 5

Force that holds atoms together.

Question 6

Covalent Bonds

Answer 6

Atoms in molecules held together by these. Formed through sharing electrons. Tend to form between non-metallic elements.(Ex.H20,NO2,CO2)

Question 7

Molecule

Answer 7

Made up of two or more atoms. Simplest particle/unit.

Question 8

Structural Formula

Answer 8

Indicates individual bonds and can indicate molecular shape

Question 9

Space-Filling Model

Answer 9

Ball w/ half balls attached

Question 10

Ball- and -stick Model

Answer 10

Balls and sticks attached together

Question 11

Cation

Answer 11

Positively charged molecule. #electrons< # protons. ex. Mg -> Mg2+ + 2e-

Question 12

Anion

Answer 12

Negatively charged molecule. # electrons> # protons. ex. S+2e- ->S2-

Question 13

Ionic Bonding

Answer 13

Result from electrostatic attraction between oppositely charged ions (Ex. NaCl)