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Intro into Chemistry
Chemistry
73
Chemistry
Undergraduate 2
10/16/2009

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Term
Natural Laws
Definition
concise statements often in mathematical form about natural phenomenon
Term
hypothesis
Definition
tentative explanation of a natural law
Term
Theory
Definition
model or way of looking at nature that can be used to explain natural laws and make future predictions about natural phenomina
Term
Scientific Method
Definition
combination of observation, experimentation, and formulation of laws, hypotheses and theories
Term
Chemistry
Definition
Science that deals with the composition and properties of matter
Term
Matter
Definition
anything that occupies space and displays the properties of mass and energy(inertia)
Term
Compostition
Definition
refers the the parts of compounds of a sample of matter and their relative proportions
Term
Properties
Definition
re those qualities or attributes that we an use to distinguish one sample of matter from another
Term
Physical Property
Definition
is one that a sample of matter displays without chaninging its composition i.e. color staying the same and so forth
Term
Physical Change
Definition
when the physical properties of a subject change but its composition stays the same
Term
Chemical Change(reaction)
Definition
when one or more kinds of matter are converted to new kinds of matter with different compositions
Term
Chemical Property
Definition
the ability or inability of a sample of matter to undergo a change in composition under stated conditions
Term
Atoms
Definition
the very tiny units that make up matter
Term
Elements
Definition
114 substances of atoms that make up these pieces that make matter
Term
Compounds
Definition
substances comprised of atoms of two or more elements joined together
Term
Molecule
Definition
the smallest entity having the same proportions of the constituent atoms as does the compound itself
Term
Substance
Definition
is a element or compound that has constant properties throughout a a given sample and from one sample to another
Term
Homogeneous mixture
Definition
a solution said to be uniform throughout in both composition and properties
Term
Heterogeneous mixtures
Definition
(i.e. sand and water) components of a substance that separate into distinct regions
Term
Solid
Definition
where atoms and molecules are in close contact, in sometimes highly organized sections called crystals
Term
Liquid
Definition
where the atoms or molecules are separated in somewhat greater distances than that of a solid
Term
Gas
Definition
distances of molecules and atoms are very much spread apart. Gas always expands to full container
Term
SI Units
Definition
Ssteme Internationale d'Unites, which is the modern version of the metric system used for scientific measuring
Term
Define Units and symbol of Length
Definition
meter m
Term
Define Units and symbol of Mass
Definition
kilogram kg
Term
Define Units and symbol of Time
Definition
second s
Term
Define Units and symbol of Temperature
Definition
kelvin K
Term
Define Units and symbol of Amount of Substance
Definition
mole mol
Term
Define Units and symbol of Electric Current
Definition
ampere A
Term
Define Units and symbol of luminous intensity
Definition
candela cd
Term
10^1
Definition
deca(d)
Term
10^2
Definition
Hecto(h)
Term
10^3
Definition
Kilo(k)
Term
10^6
Definition
Mega(M)
Term
10^9
Definition
giga(G)
Term
10^12
Definition
Tera(T)
Term
10^-1
Definition
Deci(d)
Term
10^-2
Definition
centi(c)
Term
10^-3
Definition
milli(m)
Term
10^6
Definition
micro
Term
10^9
Definition
nano(n)
Term
Mass
Definition
describes the quantity of matter in an object. In SI, mass= 1gram
Term
Celsius
Definition
melting point of ice is 0 degrees while the oiling point is 100
Term
Fahreneit
Definition
melting point of ice is 32 degress and the boiling point is 212
Term
Kelvin
Definition
assigns a value of zero to the lowest possible temperature. No negative Kelvin numbers
-273.15C =0K
Term
Density
Definition
ration of mass to volume, aka mass(m)/volume(v)
Term
Extensive property
Definition
where mass and volume are both dependent on the quantity of matter observed
Term
Intensive property
Definition
Where mass and volume are independent of amount of matter observed, aka the density is equal on both a glass of water and a pool
Term
Precision
Definition
referrs to the degree of reproductivity of a measured quantity, that is closeness of agreement when the same quantity is measured several times
Term
Accuracy
Definition
refers to how close a measured value is to accepted or actual value
Term
Law of Conservation of mass
Definition
Lavoisier's law that the total mass of a substance present after a chemical reaction is the same as the total mass of substances before the reaction
Term
Law of Constant Composition(definite proportions)
Definition
Proust's law that all samples of a compound have the same composition-the same proportions by mass of constituent elements
Term
Daltons Atomic Theory(3 points)
Definition
1.Each element is made of indivisible particles called atoms
2. All atoms of a single element are alike in mass and other properties
3.In each of their compounds different elements combine in simple ratios
Term
Law of multiple proportions
Definition
If two elements form more than a single compound, the masses of one element combined with a fixed mass of the second are in the ration of small whole numbers
Term
Cathode ray
Definition
type of radiation emitted by negative terminal(cathode)
Term
Electrolysis
Definition
the decompositon of a substance either in molten state or in an electrolyte solution, by means of electric current
Term
Protons
Definition
positively charged fundamental particles of matter in nuclei of atoms
Term
Neutrons
Definition
neutral particles
Term
Atomic number
Definition
given number of protons in an atom
Term
Mass number
Definition
total number of protons and neutrons in an atom
Term
Neutron number
Definition
Mass number - proton number
Term
Isotopes
Definition
atoms that have the same atomic number but different mass numbers
Term
Ions
Definition
when atoms lose or gain electrons in the course of a chemical reaction, form ions, which carry net charges
Term
Molecular compound
Definition
a small number of nonmetal atoms held together by covalent bonds
Term
Chemical formulas
Definition
what represents molecular compounds which indicate the elements present and the relative number of atoms of each element
Term
empirical formula
Definition
simplest formulas for compounds:shows types of atoms present and their relative numbers
Term
Molecular formula
Definition
based on actual molecule of a compound
Term
Structural Formula
Definition
shows the order in which atoms are bonded together in a molecule and by what types of bonds
Term
ionic compound
Definition
compound made up of positive and negative ions joined together by electrostatic forces of attraction
Term
cation
Definition
result of electron transfer that takes an electron away
Term
anion
Definition
result of electron transfer that adds an electron, making to be negatively charged
Term
1 & 2 & 3 & 4
Definition
mono & di & tri & tetra
Term
5 & 6 & 7 & 8 & 9 & 10
Definition
penta & hexa & hepta & octa & nona & deca
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