exam 1

Question 1

coldest possible temp (kelvin)

Answer 1

absolute 0

Question 2

formula for Celsius

Answer 2

C=(f-32)/1.8

Question 3

formula for kelvin

Answer 3

k=C+273.15

Question 4

formula for density

Answer 4

d=mass/volume

Question 5

a density of less than ___ will float on water

Answer 5

1

Question 6

volume=

Answer 6

lxwxh (cube)

Question 7

intensive property

Answer 7

characteristic that is independent of the amount of substance

Question 8

pure chemical substances require _____ to separate them

Answer 8

chemical/nuclear reactions

Question 9

______ focuses only on the exponential part of the number written in scientific notation

Answer 9

order of magnitude estimation

Question 10

in order of mag estimation, 5.6x10^7 becomes

Answer 10

10^8

Question 11

all nonzero digits are

Answer 11

significant

Question 12

interior zeroes are

Answer 12

significant

Question 13

leading zeroes are

Answer 13

not significant

Question 14

trailing zeroes after a decimal place

Answer 14

are significant

Question 15

trailing zeroes before a decimal point are

Answer 15

significant

Question 16

you always estimate ____ more digit

Answer 16

one

Question 17

law of def proportions

Answer 17

all samples of a given compound have the same proportions of their constituent elements

Question 18

law of multiple proportions

Answer 18

when 2 elements (A,B) form 2 different compounds, the masses of element B that combine with 1 gram of element A can be expressed as a ratio of small whole numbers

Question 19

the number of ___ defines the element

Answer 19

protons

Question 20

atomic number (Z)

Answer 20

number of protons

Question 21

isotope

Answer 21

atoms with the same number of protons, but different numbers of neutrons

Question 22

mass number (A)

Answer 22

protons+neutrons

Question 23

1mm=___cm

Answer 23

0.1

Question 24

how many cm in an inch?

Answer 24

2.54

Question 25

the milkman oil drop experiment deduced…

Answer 25

the charge of a single electron

Question 26

electrons are a lot _____ than protons and neutrons

Answer 26

lighter

Question 27

common properties of meats

Answer 27

-good conductors of heat/electricity
-malleable and ductile
-tend to lose electrons during chem. change

Question 28

nonmetals tend to ____ electrons when they undergo chemical changes

Answer 28

gain

Question 29

___ are used for computer chips

Answer 29

metalloids

Question 30

atomic mass

Answer 30

fraction of isotope 1 x mass of isotope 1 (etc)

Question 31

noble gases are in column

Answer 31

18

Question 32

alkali metals are in column

Answer 32

1A

Question 33

alkaline earth metals are in column

Answer 33

2A

Question 34

halogens are in column

Answer 34

7A

Question 35

halogens are ____ non-metals

Answer 35

reactive

Question 36

atomic weight

Answer 36

average mass of the isotopes, weighted according to the natural abundance of each isotope

Question 37

mole

Answer 37

the measure of material containing 6.022x10^23 particles

Question 38

Avogadro’s # =

Answer 38

1 mol = 6.022x10^23

Question 39

molar mass

Answer 39

the mass of 1 mol of atoms of an element

Question 40

molar mass in grams per mole is numerically equivalent to the elements

Answer 40

atomic mass in AMU

Question 41

volume=

Answer 41

area x height

Question 42

mega

Answer 42

10^6

Question 43

kilo

Answer 43

10^3

Question 44

deci

Answer 44

10^-1

Question 45

centi

Answer 45

10^-2

Question 46

milli

Answer 46

10^-3

Question 47

micro

Answer 47

10^-6

Question 48

nano

Answer 48

10^-9

Question 49

density ___ when temp ____.

Answer 49

decreases, increases