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AP Chemistry terms
JHU/CTY
103
Chemistry
11th Grade
10/06/2008

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Term
atom
Definition
the smallest unit of an element; atoms consist of protons, neutrons, and electrons
Term
hypothesis
Definition
a tentatively accepted explanation of facts
Term
postulate
Definition
a basic principal that may be stated without direct proof
Term
scientific law
Definition
a concise statement that summarizes a fundamental relationship of nature
Term
theory
Definition
an encompassing idea that provides a full explanation for a natural phenomenon
Term
boiling point (Tb)
Definition
the temperature at which the vapor pressure of a liquid in equilibrium with the gas phase equals the atmospheric pressure
Term
chemical bond
Definition
a stabilizing electromagnetic attraction between two atoms
Term
chemical change
Definition
a change to a substance during a chemical reaction; a change in chemical identity
Term
chemical property
Definition
a characteristic that describes how a substance will react chemically
Term
compound
Definition
a substance made up of two or more elements in specific proportions
Term
density
Definition
mass/volume
Term
element
Definition
a substance that cannot be separated by chemical means into simpler substances
Term
extensive property
Definition
a property that depends on the amount of material present
Term
gas
Definition
a phase of matter with a shape and volume defined by the shape and size of the container it occupies
Term
heterogeneous
Definition
varying from region to region
Term
heterogeneous mixture
Definition
physically combined substances that are not in one uniform phase
Term
homogeneous
Definition
uniform throughout
Term
homogeneous mixture
Definition
physically combined substances that are of one uniform phase; a solution
Term
intensive property
Definition
a property of matter that is independent of quantity
Term
liquid
Definition
a phase of matter with a definite volume and a shape defined by the shape of the container it occupies
Term
mass (m)
Definition
the quantity of matter in a substance; the SI unit for mass is the kilogram (kg)
Term
matter
Definition
anything that has mass and occupies space
Term
melting
Definition
a phase change from solid to liquid
Term
mixture
Definition
a substance that can be separated into more than one type of matter by physical means
Term
molecule
Definition
a well-defined group of covalently-bonded atoms
Term
phase
Definition
a physical state of matter, such as gas, liquid, or solid
Term
phase change
Definition
a transformation from one state of matter to another, as from solid to liquid or liquid to gas
Term
physical change
Definition
a change to the form of a substance, but not to its composition
Term
physical property
Definition
a characteristic that can be observed or measured without changing the composition of the substance
Term
pure substance
Definition
matter composed of only one type of chemical substance
Term
qualitative property
Definition
a property that is described in terms of appearance; not associated with a number
Term
quantitative property
Definition
a property that is described in terms of a number (with units); involves a measurement
Term
solid
Definition
a phase of matter with a definite shape and volume
Term
state
Definition
a physical phase of matter, such as gas, liquid, or solid
Term
volume
Definition
the amount of space occupied by a three-dimensional object
Term
boiling point (Tb)
Definition
the temperature at which the vapor pressure of a liquid in equilibrium with the gas phase equals the atmospheric pressure
Term
chemical bond
Definition
a stabilizing electromagnetic attraction between two atoms
Term
chemical change
Definition
a change to a substance during a chemical reaction; a change in chemical identity
Term
chemical property
Definition
a characteristic that describes how a substance will react chemically
Term
compound
Definition
a substance made up of two or more elements in specific proportions
Term
density
Definition
mass/volume
Term
element
Definition
a substance that cannot be separated by chemical means into simpler substances
Term
extensive property
Definition
a property that depends on the amount of material present
Term
gas
Definition
a phase of matter with a shape and volume defined by the shape and size of the container it occupies
Term
heterogeneous
Definition
varying from region to region
Term
heterogeneous mixture
Definition
physically combined substances that are not in one uniform phase
Term
homogeneous
Definition
uniform throughout
Term
homogeneous mixture
Definition
physically combined substances that are of one uniform phase; a solution
Term
intensive property
Definition
a property of matter that is independent of quantity
Term
liquid
Definition
a phase of matter with a definite volume and a shape defined by the shape of the container it occupies
Term
mass (m)
Definition
the quantity of matter in a substance; the SI unit for mass is the kilogram (kg)
Term
matter
Definition
anything that has mass and occupies space
Term
melting
Definition
a phase change from solid to liquid
Term
mixture
Definition
a substance that can be separated into more than one type of matter by physical means
Term
molecule
Definition
a well-defined group of covalently-bonded atoms
Term
phase
Definition
a physical state of matter, such as gas, liquid, or solid
Term
phase change
Definition
a transformation from one state of matter to another, as from solid to liquid or liquid to gas
Term
physical change
Definition
a change to the form of a substance, but not to its composition
Term
physical property
Definition
a characteristic that can be observed or measured without changing the composition of the substance
Term
pure substance
Definition
matter composed of only one type of chemical substance
Term
qualitative property
Definition
a property that is described in terms of appearance; not associated with a number
Term
quantitative property
Definition
a property that is described in terms of a number (with units); involves a measurement
Term
solid
Definition
a phase of matter with a definite shape and volume
Term
state
Definition
a physical phase of matter, such as gas, liquid, or solid
Term
volume
Definition
the amount of space occupied by a three-dimensional object
Term
accuracy
Definition
the degree of agreement between a measurement or group of measurements and the actual value of a given quantity
Term
ampere (A)
Definition
the SI base unit of electric current; 1 A = 1 C/s
Term
atmosphere (atm)
Definition
a non-SI unit of pressure; 1 atm = 1.013250 x 105 Pa
Term
base SI unit
Definition
one of the seven fundamental SI units; the meter (m) for length, kilogram (kg) for mass, second (s) for time, ampere (A) for electric current, kelvin (K) for temperature, mole (mol) for amount of substance, and candela (cd) for luminous intensity
Term
Celsius temperature scale
Definition
a temperature scale on which the freezing point of pure water at 1 atm pressure is 0° and the boiling point of pure water at 1 atm pressure is 100°
Term
charge
Definition
the property that governs interactions between bodies through electrostatic forces; electric charge
Term
coulomb (C)
Definition
the SI unit of charge; 1 C = 1 A·s
Term
current (I)
Definition
the amount of charge flowing past a point per unit time, measured in amperes (A); electric current
Term
density
Definition
mass/volume
Term
derived unit
Definition
a unit obtained by combining two or more of the base SI units
Term
dimensional analysis
Definition
a method for solving for a quantity by multiplication by conversion factors
Term
energy
Definition
the capacity to do work or transfer heat
Term
Fahrenheit temperature scale
Definition
a temperature scale on which the freezing point of pure water at 1 atm pressure is 32° and the boiling point of pure water at 1 atm pressure is 212°
Term
graduated cylinder
Definition
a piece of glassware used to deliver a known, variable volume
Term
joule (J)
Definition
the unit associated with work; 1 J = 1 kg·m2/s2
Term
kelvin (K)
Definition
the SI unit of temperature; T(K) = T(°C) + 273.15
Term
Kelvin temperature scale
Definition
a temperature scale on which absolute zero is 0 and the freezing point of water at 1 atm is 273.15; the unit of the Kelvin temperature scale is the kelvin (K), and is the same size as 1°C
Term
kilogram (kg)
Definition
the base SI unit of mass
Term
liter (L)
Definition
the SI unit of volume; 1 L = 1 dm3
Term
meniscus
Definition
the interface between a liquid and a gas
Term
meter (m)
Definition
the base SI unit of length; the distance traveled by light in a vacuum during a time interval of 1/299792458 s
Term
mole
Definition
the amount of substance that contains as many particles as exactly 12 grams of carbon-12; 6.0221367 x 1023 things
Term
Newton (N)
Definition
the SI unit of force; 1 N = 1 kg·m/s2
Term
pascal (Pa)
Definition
the SI unit of pressure; 1 Pa = 1 N/m2 = 9.869233 x 10-6 atm
Term
potential difference
Definition
DE; the difference in electrical potential between two points, such as between the electrodes of a galvanic cell; voltage
Term
power
Definition
the rate of energy transfer; the SI unit of power is the watt (W), where 1 W = 1 J/s
Term
precision
Definition
reproducibility of a measurement of a given quantity
Term
pressure (P)
Definition
force per unit area
Term
random error
Definition
error associated with the estimation of the last digit of any measurement
Term
second (s)
Definition
the base SI unit of time
Term
significant figures
Definition
digits which reflect the precision of a measured quantity, which include all certain digits and a final one with some uncertainty; zeros that are placeholders are not counted
Term
systematic error
Definition
error inherent to the measurement of a value
Term
Système International d’Unités (SI)
Definition
the accepted standard system of units, built upon seven base SI units (the meter, kilogram, second, ampere, kelvin, mole, and candela)
Term
temperature (T)
Definition
a measure on the macroscopic level of the degree of hotness of a system, proportional to the average kinetic energy of the components of the system on an atomic-molecular level
Term
volt (V)
Definition
the SI unit of electrical potential difference; 1 V = 1 J/C
Term
volume
Definition
the amount of space occupied by a three-dimensional object
Term
volumetric pipette
Definition
a piece of glassware used to deliver a known, fixed volume of liquid
Term
watt (W)
Definition
the SI unit of power; 1 W = 1 J/s = 1 kg·m2/s3
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