Unit 2: Chemisty of Life

Question 1

matter

Answer 1

what all living things are made up of

Question 2

atom

Answer 2

smallest particle of an element

Question 3

proton

Answer 3

positive charge, found in nucleus

Question 4

electron

Answer 4

negative charge

Question 5

neutron

Answer 5

neutral charge, found in nucleus

Question 6

nucleus

Answer 6

center of an atom

Question 7

atomic #

Answer 7

number of protons

Question 8

mass #

Answer 8

combination of protons and neutrons in the nucleus

Question 9

element

Answer 9

pure substance that can’t be broken down into other substances

Question 10

ion

Answer 10

charged atom or molecule, number of electrons doesn’t equal number of protons, losing or gaining e-

Question 11

compound

Answer 11

2 atoms of diff elements bonded together

Question 12

isotope

Answer 12

two or more types of atoms with the same atomic number and spit on the PT but different atomic mass and characteristics

Question 13

reactivity

Answer 13

ability to form bonds

Question 14

valence electrons

Answer 14

e- in outer most shell

Question 15

octet rule

Answer 15

atoms want full shells to be stronger

Question 16

chemical bond

Answer 16

lasting attraction, allows forming of chemical compounds

Question 17

ionic bond

Answer 17

transfer of e- from one atom to another

Question 18

covalent bond

Answer 18

share a e-

Question 19

molecule

Answer 19

group of atoms bonded together

Question 20

polarity

Answer 20

unequal sharing of e-

Question 21

electronegative

Answer 21

greedy for e-, pulls e- towards itself

Question 22

hydrogen bond

Answer 22

when H is weakly bonded to an atom with a partial negative charge

Question 23

heat capacity

Answer 23

amount of heat energy required to increase a substances temp

Question 24

capillary actions

Answer 24

force that draws water to rise in narrow tube against gravity, tear ducts, water transport to plants

Question 25

surface tension

Answer 25

caused by waters polarity and H bonding creating strong cohesive layer

Question 26

cohesion

Answer 26

water molecules sticking to other water molecules

Question 27

adhesion

Answer 27

water molecules sticking to anything other than water

Question 28

solution

Answer 28

uniform mixture, homogenous

Question 29

solute

Answer 29

substance being dissolved

Question 30

solvent

Answer 30

dissolving agent

Question 31

hydrophobic

Answer 31

water fearing, covalent, non polar

Question 32

hydrophilic

Answer 32

water loving, ionic compounds, polar covalent compounds

Question 33

homogenous

Answer 33

solution, salt water

Question 34

heterogeneous

Answer 34

suspension, doesn’t mix, sand and water

Question 35

suspension

Answer 35

2 or more materials that don’t chemically combine