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Glossary of Chem chapter 1 2

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element
cant be broken down chemicly
intensive property
have values that do not depend on amount of sample
extensive property
values that do depend on amount
alkali metals
group 1A, shiny, soft metals, react rapidly with water, produce basic products, never found in pure state in nature
Alkaline Earth metals
Group 2A, lustrous, silvery metals, less reactive then 1A, never found in a pure state
Halogens
Group 7A, colorful, corrosive, nonmetals, found in nature only in combonation with other elements
metals
largest category
left Side of table
almost all solid at room temp
Silvery Shine
malleable
good conductor of heat & electricity
Nonmetals
found on right Side
11 of 17 are gas
1 of 17 is liquid
5 of 17 are solid
None are Silvery
Several brightly colored
brittle
poor conductors of heat & electricity
Semi metals
border metals and nonmetals
properties are intermediate
most silvery
all solid
brittle
poor conductor of heat & electricity
mass
Kg
length
M
Temp
K
amount of substance
Mol
Time
S second
electric current
A ampere
luminous intensity
cd candela
Area
m2
volume
M3
Density
mass / volume
speed
ms2
Acceleration
m/s2
force
(kgXm)/s2(n)
pressure
kg/(mXS2)(Pa)
energy
(Kg X m2 /S2 (J)
accuracy
how close true valve of
given measurement is
precision
how well a number of
independent measures
agree with each other
Democritus
said all elements composed
of tiny particles called
elements
Dalton
Proposed theory of matter
Daltons theory
of matter
1) elements are made
of tiny particles called
elements
2) each element is
characterized by the mass
of its atoms. same have
same
3) chemical combos
of elements to make different
substances occurs when
atoms join together
4) chemical reactions
only rearrange the way
that atoms are combined.
the atoms Stay unchanged
Thomson
used cathode ray tube
to discover electrons
mass of an
electron
elm = 1.758820x10^8 C/g
R.A. Millikan
oil drop experiment
M= 9.109382x10^28g
Rutherford
alpha particles
on gold foil
found the nucleus
percent yeild=
actual yeild of product/theoretical yeild of product X100%
molarity=
moles of solute/liters of solution
moles of solute=
molarity X volume of solution
volume of solution =
moles of solute/molarity
multiple=
molecular mass/emperical formula mass
mass=
volume X density

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