chemistry
the study of the composition, structure, properties, and changes of matter
property
any characteristic that gives a sample of matter its unique identity
element
a substance that cannot be separated into simpler substances by chemical means; composed of only one type of atom
atom
the smallest representative particle of an element
molecule
an entity composed of two or more atoms with the atoms attached to one another in a specific way
mass
a measure of the amount of material in an object
states of matter
gas, liquid, and solid
gas
has no fixed volume or shape; conforms to the volume and shape of its container; molecules are far apart and move at high speeds
liquid
has a distinct volume independent of its container but had no specific shape; assumes the shape of the portion of the container it occupies; molecules are packed more closely together but move rapidly and slide
solid
has a definite shape and volume; molecules are held tightly together in definite arrangements and wiggle slightly
pure substance
matter that has distinct properties and a composition that doesn't vary from sample to sample (elements and compounds)
compound
a substance composed of two or more elements
mixture
a combination of two or more substances in which each substance retains its own chemical identity
components
the substances that make up a mixture
homogeneous mixture (solution)
a mixture that is uniform throughout ( a solution)
heterogeneous mixture
a mixture that does not have the same composition, properties, and appearance throughout
law of constant composition (law of definite proportions)
the elemental composition of a pure compound is always the same
physical properties
can be measured without changing the identity and composition of the substance (color, odor, density, melting point, boiling point, hardness)
chemical properties
describe the way a substance may change, or react, to form other substances
physical change
matter does not change its composition (ex. changes of states)
chemical change (chemical reaction)
a substance is transformed into a chemically different substance
intensive properties
are independent of the amount of matter examined; are used to identify substances
extensive properties
relate to the amount of substance present
scientific method
a dynamic process used to answer questions about our physical world
scientific laws
general rules that summarize how nature behaves
hypothesis
a tentative explanation that guides in planning further experiments
theory
an explanation of the general causes of certain phenomena, with considerable evidence or facts to support it
quantitative analysis
the determination of the amount of a given substance that is present in a sample
qualitative analysis
the determination of the presence or absence of a particular substance in a mixture
metric system
metric units are used for scientific measurements
SI units
preferred units used in scientific measurement (length=meter (m), mass=kilogram (kg), time=second (s), temperature=Kelvin (K))
temperature
the measure of the hotness or coldness of an object; determines the direction of heat flow
Celsius scale
the everyday temperature scale of most countries
Kelvin scale
the SI temperature scale
Kelvin <--> Celsius
K = C + 273.15
Celsius --> Fahrenheit
F = (9/5)C + 32
Fahrenheit --> Celsius
C = (5/9)(F - 32)
precision
indicates how closely different measurements of a quantity agree with one another
accuracy
indicates how well a measurement agrees with the accepted or "true" value
significant figures
in a measured quantity, they include one estimated digit (the last digit of the measurement)
dimensional analysis
an approach to problem solving in which we keep track of units as we carry measurements through calculations
conversion factor
a fraction whose numerator and denominator are the same quantity expressed in different units
length (l)
meters (m)
mass (m)
grams (g)
time (t)
seconds (s)
temperature (T)
Kelvin (K)
amount of substance (n)
mole (mol)
Giga-
10^9, G
Mega-
10^6, M
Kilo-
10^3, k
Hecto-
10^2, h
Deka-
10^1, da
Deci-
10^-1, d
Centi-
10^-2, c
Milli-
10^-3, m
Micro-
10^-6, µ
Nano-
10^-9, n
Area
square meter, length x width
Volume
cubic meter, length x width x height
Speed, Velocity
meter per second, length / time
Wave number
1 per meter, number / length
Density
kilogram per cubic meter, mass / volume
Force
newton, length x mass / time x time
Pressure
pascal, force / area
Energy
joule, force x length
Cation
ion with positive charge
Anion
ion with negative charge
Aluminum
Al^3+
Ammonium
NH4^+
Arsenic (III)
As^3+
Arsenic (V)
As^5+
Barium
Ba^2+
Bismuth (III)
Bi^3+
Bismuth (V)
Bi^5+
Cadmium
Cd^2+
Calcium
Ca^2+
Chromium (III)
Cr^3+
Chromium (III)
Cr^3+
Cobalt (II)
Co^2+
Cobalt (III)
Co^3+
Copper (I)
Cu^+, Cuprous
Copper (II)
Cu^2+, Cupric
Hydrogen
H^+
Hydronium
H3O+
Iron (II)
Fe^2+, Ferrous
Iron (III)
Fe^3+, Ferric
Lead (II)
Pb^2+, Plumbous
Lead (III)
Pb^3+, Plumbic
Lithium
Li+
Magnesium
Mg^2+
Manganese (II)
Mn^2+
Manganese (IV)
Mn^4+
Mercury (I)
Hg2^2+, Mercurous
Mercury (II)
Hg^2+, Mercuric
Nickel (II)
Ni^2+
Potassium
K^+
Silver
Ag^+
Sodium
Na^+
Strontium
Sr^2+
Tin (II)
Sn^2+, Stannous
Tin (IV)
Sn^4+, Stannic
Zinc
Zn^2+
Bromide
Br^-
Bromate (I)
BrO^-, Hypobromite
Bromate (III)
BrO2^-, Bromite
Bromate (V)
BrO3^-, Bromate
Bromate (VII)
BrO4^-, Perbromate
Carbonate
CO3^2-
Chlorate (I)
ClO-, Hypochlorite
Chlorate (III)
ClO2^-, Chlorite
Chlorate (V)
ClO3^-, Chlorate
Chlorate (VII)
ClO4^-, Perchlorate
Chloride
Cl^-
Chromate
CrO4^2-
Cyanide
CN^-
Dichromate
Cr2O7^2-
Dihydrogen Phosphate
H2PO4^-
Ethanoate
C2H3O2^-, Acetate
Fluoride
F^-
Hydride
H^-
Hydrogen Carbonate
HCO3^-, Bicarbonate
Hydrogen Oxalate
HC2O4^-, Binoxalate
Hydrogen Phosphate
HPO4^2-
Hydrogen Sulfate
HSO4^-, Bisulfate
Hydrogen Sulfide
HS^-, Bisulfide
Hydrogen Sulfite
HSO3^-, Bisulfite
Hydroxide
OH^-
Iodate (I)
IO^-, Hypoiodite
Iodate (III)
IO2^-, Iodite
Iodate (V)
IO3^-, Iodate
Iodate (VII)
IO4^-, Periodate
Iodide
I^-
Manganate (VII)
MnO4^-, Permangeate
Nitrate
NO3^-
Nitride
N^3-
Oxalate
C2O4^2-, Ethandioate
Oxide
O^2-
Peroxide
O2^2-
Phosphate
PO4^3-
Sulfate
SO4^2-
Sulfide
S^2-
Sulfite
SO3^2-
Thiosulfate
S2O3^2-
Thiocyanate
SCN^-
(Polyatomic Ions) +2
Hg2^2+
(Polyatomic Ions) +1
NH4^+
(Polyatomic Ions) -1
BrO^-, BrO2^-, BrO3^-, BrO4^-, C2H3O2^-, ClO^-, ClO2^-, ClO3^-, ClO4^-, CN^-, HCO3^-, HC3O4^-, H2PO4^-, HS^-, HSO3^-, HSO4^-, IO^-, IO3^-, IO4^-, MnO4^-, NO2^-, NO3^-, OH^-, SCN^-
(Polyatomic Ions) -2
CO3^2-, C2O4^2-, CrO4^2-, Cr2O7^2-, HPO4^2-, SO3^2-, SO4^2-, S2O3^2-
(Polyatomic Ions) -3
PO3^3-, PO3^3-
Density
mass/volume
q
m*c*deltaT
q
heat
delt T
temperature change
m
mass
c
specific heat
delta G
delta H - T*deltaS
delta G<zero
reaction is spondtaneuous at this temperature
delta G>zero
+delta H, low temperature
delta G>zero
-delta S, high temperature
Delta G>zero
-delta H, + delta S, any temperature
Delta G<0
-delta H, +delta S, any temperature
Delta G<0
+delta S, High Temperature
Delta H>0
endothermic
delta H<0
exothermic
delta T
kmi
kmi?
Freezing Point Depression and Boiling Point Depression
i
whole number equaling the number of particles a substance dissolves into
k
solvent constant
m
molality (NOT molarity)
molarity
moles solute/volume of solution
molality
moles solute/kilograms of solvent
mole fraction
moles solute/total of solution
PV
nRT
P
pressure in atm
V
volume in liters
n
number of moles of gas particles in the container
R
the ideal gas constant
T
temperature in Kelvin
R
0.08 Latm/mole K
1 amt
760 torr (760 mm Hg)
Energy (heat): 1 Calorie
1000 calories (4000 joules)
0 Celsius
273 kelvin
to find the mass of a mole of a substance
multiply the formula weight by the number of moles
1 mole of gas at STP
22.4 L volume
All alkalie and ammonium compounds are
soluble
All acetates, chlorate, nitrates, and perchlorates are
soluble
Pb, Hg, and Ag salts are insoluble unless
they are paired with one of the anions which are soluble
When oxygen is in a compound, its oxidation state is usually ___, with the exception of oxygen in a _____ which has a oxidation state of _____
-2, peroxide, -1
When an alkali metal is involved in a compound its oxidation state is always
+1
When an alkaline earth metal is involved in a compound, its oxidation state is
+2
When a halogen is involved in a compound its oxidation state is often
-1,
the oxidation state of fluorine in a compound is
-1
When hydrogen is combined with a nonmetal, it's oxidation state is
+1
When hydrogen is combined with a metal, it's oxidation state is
-1
In any compound the sum of all oxidation states
0
Avogadro's number
6.02 x 10^23 molecules/moles
OIL
Oxidation is Losing Electrons
Oxidation is
losing electrons
RIG
reduction is gaining electrons
Reduction is
gaining electrons
AN OX
Oxidation occurs at Anode
Red Cat
reduction occurs at the Cathode
Ecell>0
reaction is spontaneous and energy is released (battery)
E<0
reaction is NOT spondtaneous and required a voltage source (electron plating)
keq
[products]/[reactants]
keq
[C]^c[D]^d/[A]^a[B]^b
keq>1
products favored
keq<1
reactants favored
Ionization energy increases
upper right
Electronegativity increases
upper right
Atomic radius increases
lower left
Electron Affinity increases
upper right
Acidity increases
lower right
pH
pKa+log[A]/[HA]
pH
-log10[H+]
pH>7
Basic
pH<7
Acidic
pH=7
Neutral
Strong Acids
HCl, HI, H2SO4, HBR, HClO4, HNO3
Strong Bases
All Group I Hydroxides
n = 1, ℓ = 0 , mℓ = 0
1s
n = 2, ℓ = 1, mℓ = 1
2px
n = 2, ℓ = 1, mℓ = 0
2pz
n = 2, ℓ = 1, mℓ = -1
2py
n = 3, ℓ = 2, mℓ = 2
3dx²-y²
n = 3, ℓ = 2, mℓ = 1
3dxz
n = 3, ℓ = 2, mℓ = 0
3dz²-x²-y²
n = 3, ℓ = 2, mℓ = -1
3dyz
n = 3, ℓ = 2, mℓ = -2
3dxy
Radio Waves
electromagnetic waves with the longest wavelengths and lowest frequencies, for radio and television communications
Microwaves
for microwave ovens, cell phones, and radar
Infrared Waves
3rd longest wave, can be felt as heat, used in heat lamps, electrical appliances, remote controllers for televisions and intruder alarms
Visible Light
Electromagnetic waves that can be seen with the unaided eye, ROYGBIV
ROYGBIV
Red, Orange, Yellow, Green, Blue, Indigo, Violet
Ultraviolet Rays
invisible rays of the spectrum lying outside the violet end of the visible spectrum, can cause skin cancer and sunburns, for medicine and security
X-Ray wave
image created by sending electromagnetic radiation through body parts, solid parts appear white, can penetrate almost all matter, can lead to cancer
Gamma Rays
Electromagnetic waves with the shortest wavelengths and highest frequencies, can be used to kill cancer cells in the body
Electromagnetic Wave
a wave that can travel through space or matter and consists of changing electric and magnetic energy
Electromagnetic Radiation
energy that travels through space in the form of waves
wave
disturbance that transfers energy from place to place
Electromagnetic Spectrum
complete range of electromagnetic waves In order of increased frequencies, are all light waves
energy
Is the ability to do work
medium
Material through which a wave travels.
vibration
A repeated back-and-forth or up-and-down motion
crest
Highest point of a wave
trough
Lowest point of a wave
amplitude
maximum distance that the particles of the medium carrying the wave move away from their rest position
wave length
The distance between crest to the next crest of a wave
frequency
How many waves can pass a given point in a certain amount of time
hertz
Frequency is measured in
Transparent materials
Allow all light to pass through
Translucent material
scatters light as it passes through
Opaque materials
allows no light to come through
Primary colors
Three colors that can combine to make any other color(red, blue, green)
secondary colors
2 primary colors combine in equal amounts
complementary colors
any two colors that combine to form white light
pigments
colored substances that are used to color other substances
reflection
when a object or wave bounces back off a surface though which it cannot pass
concave mirror
A mirror with a surface that curves inward
convex mirror
A mirror with a surface that curves outward
refraction
bending of light waves due to a change in speed
lens
A piece of transparent and curved material that refracts light.
convex lens
thicker in the center than the edges
concave lens
thinner in the center than the edges
camera
An optical instrument that uses 1 or more lenses to focus light, and film to record an image of an object.
telescope
An optical instrument for making distant objects appear nearer and larger by using a combination of lens and mirrors
microscope
An optical instrument for magnifying very small objects by using a combination of lenses
Refracting and Reflecting
two types of telescopes
Light/compound and electron
2 types of microscopes