Chem/bio

Question 1

Electrons

Answer 1

Negligible mass

Negative charge

Question 2

Protons

Answer 2

Have mass

Positive charge

Question 3

Neutrons

Answer 3

Have mass

No charge

Question 4

Atomic number

Answer 4

Number of protons

Question 5

Atomic weight

Answer 5

Average of mass numbers of isotopes in their normally occurring proportions

Question 6

Isotopes

Answer 6

Forms of an element with different #s of neutrons, & diff. Mass #s

Question 7

Radioisotopes

Answer 7

Give off energy in the form of alpha, beta, & gamma radiation from then nucleus

Question 8

Electron shells

Answer 8

1st shell- holds 2 electrons
2nd shell- holds 8 electrons
Additional shell- each hold 8 electrons

Question 9

Chemical bond

Answer 9

The attractive force that links atoms together to form molecules

Question 10

Covalent bonds

Answer 10

Atoms share one or more pairs of electrons so that the outer shells are filled

Question 11

Polar covalent bond

Answer 11

Electrons are drawn to one nucleus more than the other because that atom has greater electronegativity

Question 12

Ions

Answer 12

An atom or molecules with a net electric charge due to the loss or gain of one or more electrons

Question 13

Cations

Answer 13

Positive

Question 14

Anion

Answer 14

Negative

Question 15

Ionic bonds

Answer 15

Based on the electrical attraction of a positive and negative ion

Question 16

Hydrogen bonds

Answer 16

Attraction between the - end of one molecule and the + hydrogen end of another molecule

Question 17

Hydrophilic

Answer 17

Water loving

Molecules can form hydrogen bonds with water

Question 18

Hydrophobic

Answer 18

Water fearing

Molecules don’t form hydrogen bonds with water

Question 19

Van der waals forces

Answer 19

Attractions between nonpolar molecules that are close together

Question 20

Chemical reactions

Answer 20

When atoms collide with enough energy to combine or charge their bonding partners

Question 21

Solution

Answer 21

Substance(solute) dissolved in a liquid (solvent)

Question 22

Mole

Answer 22

The amount of a substance (in grams) that is numerically equal to its molecular weight

Question 23

Molar

Answer 23

1molar solution is 1 mole of a substance dissolved in water to make 1 liter of solution

Question 24

Acids

Answer 24

Dissolve in water

Release hydrogen ions H+ protons

Question 25

Bases

Answer 25

Accept H+ ions

Question 26

pH

Answer 26

Negative log of the molar concentration of H+ ions