Chem Test I 2

Front 1

a proposed explanation for oberservations and laws.

Back 1

theory

Front 2

a model of the way nature works and predicts behavior that extends well beyond the observations and laws which it was formed

Back 2

theory

Front 3

a procedure that makes use of observable predictions to test a theory

Back 3

experiment

Front 4

1st step in sci method; measures or describes something about the physical world

Back 4

oberservation

Front 5

in a chemical reaction, matter is neither created nor destroyed.

Back 5

law of conservation of mass

Front 6

statement that summarizes past observations and predicts future ones

Back 6

Scientific Law

Front 7

statement formulated from a series of related observations

Back 7

Scientific Law

Front 8

a theory before it has become well established

Back 8

hypothesis

Front 9

a tentative explanation for an observation or sci problem that can be tested by further explanation

Back 9

hypothesis

Front 10

wood burning, physical or chemical change?

Back 10

chemical

Front 11

ice melting, chemical or physical change?

Back 11

physical

Front 12

Joule is a unit of _______

Back 12

energy

Front 13

SI standard unit of mass

Back 13

kilogram

Front 14

volume is a measurement of _____

Back 14

space

Front 15

density =

Back 15

mass/volume

Front 16

ways of expressing volume

Back 16

grams over cm3, mL, L

Front 17

who discovered the electron?

Back 17

JJ Thomson

Front 18

proton's mass

Back 18

1 amu

Front 19

mass of a neutron in relation to a proton's mass

Back 19

about the same

Front 20

energetic particles emitted from the nucleus of an atom when it is undergoing the nuclear process

Back 20

nuclear radiation

Front 21

the percentage amount of each isotope of an element in a naturally occuring sample of the element

Back 21

percent natural abundance

Front 22

describes a substance that emits tiny, invisible, energetic particles from the nuclei of its component atoms

Back 22

radioactive

Front 23

the unit commonly used to express the masses of protons, neutrons and nuclei

Back 23

atomic mass unit(amu)

Front 24

1 amu=

Back 24

1.66 x 10 (-24) g

Front 25

weighted avg of the masses of each isotope, aka avg mass of the atoms of an element

Back 25

atomic mass

Front 26

conductivity that can be changed and controlled

Back 26

semiconductor

Front 27

elements that exist in nature with single atoms as their basic unit

Back 27

atomic elements

Front 28

what you call the 7 elements that exist in nature as diatomic molecules as their basic unit

Back 28

molecular elements

Front 29

atoms close together and vibrate about fixed point, def shape, def vol, incompressible

Back 29

solid

Front 30

atoms close together , free to move, indef shape, def vol, incompressible

Back 30

liquid

Front 31

atoms far apart, free to move, indef shape, indef vol, compressible

Back 31

gas

Front 32

a property displayed without changing composition

Back 32

physical

Front 33

a property displayed only through a change in composition

Back 33

chemical

Front 34

K=C??

Back 34

K=C+273

Front 35

C=F?

Back 35

C=(F-32)/1.8

Front 36

specific heat of water

Back 36

4.184 j/g C

Front 37

the quantity of heat energy required to change the temp of one gram of a substance by 1 degree C.

Back 37

specific heat capacity

Front 38

heat capacity formula

Back 38

C=(g) (specific heat cap) (^T)

Front 39

g to ML conversion

Back 39

1

Front 40

evaporation is endo/exo thermic

Back 40

endo

Front 41

condensation is endo/exo thermic

Back 41

exo