Lecture 2

Question 1

Parts of an atom (3)

Answer 1

Proton, neuron, electron

Question 2

Weight contribution for nuetron, proton, and electron

Answer 2

Mass of proton & neutron is 1. Electron is 1/2000

Question 3

Charge for proton, neutron, & electron

Answer 3

P: +1
N: 0
E: -1

Question 4

The # of protons in the nucleus of an atom

Answer 4

Atomic number

Question 5

TF: The atomic mass is an element is often an even number

Answer 5

False, rarely

Question 6

How do atoms, ions, and isotopes differ in?

Answer 6

Atoms: # of protons
Ions: # of electrons
ISO: # of neutrons

Question 7

Positive ions formed by losing electrons

Answer 7

Cations

Question 8

Negative ions formed by gaining electrons

Answer 8

Anions

Question 9

Carries electrical impulses in the nervous system (3)

Answer 9

K+, Na+, Cl-

Question 10

What is electrically charged Atom or Ion

Answer 10

Ion, Atom is electrically neutral

Question 11

Nuclides with the same atomic number, but different mass numbers

Answer 11

Isotopes

Question 12

Isotope is __ if nucleus is unstable

Answer 12

Radioactive

Question 13

Involves transfer of electrons between two atoms

Answer 13

Ionic bond

Question 14

Ionic bond bonds are held together by attraction between a () and () ion

Answer 14

(+) (-)

Question 15

Formed when the electrons are shared equally

Answer 15

Nonpolar covalent bonds

Question 16

Formed when the electrons are not shared equally

Answer 16

Polar covalent bonds

Question 17

Weak bonds that occur between the slightly positive hydrogen end and slightly negative end of another molecule

Answer 17

Hydrogen bonds

Question 18

Molecular notation for oxygen

Answer 18

O2

Question 19

The # of bonds an atom can make is determined by the number of __ spaces in the valence (electron orbits)

Answer 19

Empty

Question 20

Molecular notation of Carbon Dioxide

Answer 20

CO2

Question 21

VE: 1st shell holds __ electrons

Answer 21

2

Question 21

VE: 2nd shell holds __ electrons

Answer 21

8

Question 22

Water molecules stick together

Answer 22

Adhesion

Question 23

Water allows molecular bonds to be broken and rearranged

Answer 23

Hydrolysis

Question 24

Capillary action

Answer 24

Cohesion

Question 25

Ionic compound that releases HYDROGEN in solution

Answer 25

Acid

Question 26

Ionic compound that releases HYDROXIDE in solution

Answer 26

Base

Question 27

Can disrupt molecular bonds

Answer 27

Water pH

Question 28

Very high energy state, HEAT molecules move too quickly to bind

Answer 28

Water Vapor

Question 29

Water absorbs more energy before evaporating

Answer 29

Water liquid

Question 30

Very low energy state- Molecular movement is imperceptible

Answer 30

Ice

Question 31

Resists solidification and vaporization

Answer 31

Liquid water