Chem Exam 1

Front 1

theory

Back 1

a proposed explanation for oberservations ans laws.

Front 2

theory

Back 2

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

Front 3

experiment

Back 3

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

Front 4

oberservation

Back 4

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

Front 5

law of conservation of mass

Back 5

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

Front 6

Scientific Law

Back 6

statement that summarizes past observations and predicts future ones

Front 7

Scientific Law

Back 7

statement formulated from a series of related observations

Front 8

hypothesis

Back 8

a theory before it has become well established

Front 9

hypothesis

Back 9

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

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

specific heat capacity

Back 13

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

Front 14

signficant figures

Back 14

non-place-holding digits in a reported measurement; represent precision.

Front 15

kilogram

Back 15

SI standard unit of mass

Front 16

SI units stands for

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International System

Front 17

volume is a measurement of _____

Back 17

space

Front 18

density =

Back 18

mass/volume

Front 19

ways of expressing volume

Back 19

grams over cm3, mL, L

Front 20

English system

Back 20

measurement system used in U.S.

Front 21

who discovered the electron?

Back 21

JJ Thomson

Front 22

proton's mass

Back 22

1 amu

Front 23

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

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about the same

Front 24

main group elements tend to ….

Back 24

be predictable based on their position on the periodic table

Front 25

nuclear radiation

Back 25

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

Front 26

nonmetals are found on the right side of the periodic table in the (upper/lower corner)

Back 26

upper

Front 27

nonmetals tend to (gain/lose) an electron in chemical reactions

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gain

Front 28

percent natural abundance

Back 28

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

Front 29

transitional metals are (more/less predictable) based on their position on than main group metals

Back 29

less

Front 30

like main group metals, transitional metals (gain/lose) electrons in chemical reactions

Back 30

lose

Front 31

Unlike main group metals, transition metals (do/do not) necessarily acquire noble gas configurations

Back 31

do not

Front 32

radioactive

Back 32

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

Front 33

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

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atomic mass unit(amu)

Front 34

1 amu=

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1.66 x 10 (-24) g

Front 35

atomic mass

Back 35

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

Front 36

conductivity that can be changed and controlled

Back 36

semiconductor

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degree of reactivity of alkali metals

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highly reactive

Front 38

degree of reactivity of halogens

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highly reactive

Front 39

column # of halogens

Back 39

7A

Front 40

degree of reactivity of alkaline earth metals

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fairly reactive

Front 41

column # of alkaline earth metals

Back 41

2A

Front 42

nobal gases are chemically ______

Back 42

inert

Front 43

column # of noble gases

Back 43

8A