Chapter 2

Question 1

element

Answer 1

substance of atoms that can’t be broken down into smaller components

Question 2

molecule

Answer 2

particle with more than one atom

Question 3

compound

Answer 3

molecule with more than one element

Question 4

isotope

Answer 4

atoms of same element with different number of neutros

Question 5

covalent bond

Answer 5

sharing electrons

Question 6

ionic bond

Answer 6

2 ions with opposite charges

Question 7

hydrogen

Answer 7

hydrogen atoms covalently bonded that are attracted to another atom on another molecule

Question 8

polar molecule

Answer 8

when one side is more +/-

Question 9

organic compound

Answer 9

(carbon-carbon) (carbon-hydrogen)

Question 10

inorganic compound

Answer 10

no carbon or carbon with other elements besides hydrogen

Question 11

DNA

Answer 11

code for genes

Question 12

RNA

Answer 12

translates code

Question 13

lipid

Answer 13

smaller organic molecule - doesn’t mix with water (fat/oil)

Question 14

eukaryotic

Answer 14

animals/plants/fungi/protists

Question 15

prokaryotic

Answer 15

bacteria

Question 16

energy

Answer 16

ability to do work

Question 17

power

Answer 17

rate of which work is done

Question 18

chemical energy

Answer 18

PE stored in chemical bonds

Question 19

steady system

Answer 19

inputs=outputs

Question 20

open system

Answer 20

system which exchanges of matter/energy occur across system boundaries

Question 21

closed system

Answer 21

system which exchanges of matter/energy doesn’t occur across system boundaries

Question 22

1st law

Answer 22

energy is not created/destroyed - but can change from one form to another