biology chapter 2

Question 0

Atomic structure

Answer 0

Atoms has protons, electrons, and neutrons

Question 1

Nature of atoms

Answer 1

Matter - has mass and occupies space

All matter is composed of atoms

Question 2

Proton

Answer 2

Positively charged particles

Located in the nucleus

Question 3

Neutrons

Answer 3

Neutral particles

Located in the nucleus

Question 4

Electrons

Answer 4

Negatively charged particles

Found in the orbitals surrounding the nucleus

Question 5

Chemicals in the body

Answer 5

Carbon, hydrogen oxygen nitrogen 96.3%

Others sodium chlorine calcium phosphorus potassium sulfur iron magnesium

Question 6

Chemical bonds

Answer 6

Ionic covalent hydrogen bonds

Question 7

Molecules

Answer 7

Are groups of atoms held together in a stable association (o=o) o2

Question 8

Compounds

Answer 8

Are molecules containing more than one type of element (H20)

Question 9

Ionic bonds

Answer 9

Formed by the attraction of oppositely charged ions

Gain or loss of electrons forms ions

Question 10

redox

Answer 10

Oxidation= loss of an electron 
Reduction= gain of electron

Question 11

Elements

Answer 11

Valance electrons - number of electrons in the outermost energy level - if not “full” they are reactive elements
Inert (no reactive ) elements have all eight electrons

Question 12

Energy levels

Answer 12

Radioactive isotopes

Question 13

Atomic number

Answer 13

Number of protons equals the number of electrons

Question 14

Element

Answer 14

Any substance that can’t be broken down to any other substance by ordinary chemical means

Question 15

Atomic mass

Answer 15

Mass of proton plus mass of neutrons
Mass refers to amount of substance
Weight refers to the force of gravity exerts on substance

Question 16

Electrons

Answer 16

Negatively charged particles

Question 17

Acid

Base

Answer 17

Releases h+ and anions
Releases oh- and cations
Acid + base > salt + water
Hcl + NaOH > Nacl + water