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32 Cards in this Set

  • Front
  • Back
chemistry
the study of matter and the transformation it undergoes
matter
anything that occupies space and has mass
solids
rigid shape, fixed volume. external shape reflects atomic and molecular arrangement
liquids
no fixed shape, may not fill a container completely
gases
expand to fill container, good theoretical understanding
macroscopic
what we can see
particulate
what we cannot see
chemical elements
pure substances that cannot be decomposed by ordinary means to other substances.
atom
smallest particle of an element that has its chemical properties. it consists of a nucleus (protons and nuetrons) and electrons in space about the nucleus.
molecule
smallest unit of a compound that retains the chemical characteristics of the compound.
kinetic nature
how fast particles move in space.
compound
when elements form a bond. elements form compounds.
mixture
when elements coexist but dont form a bond.
physical properties
color, melting and boiling point, density, and odor
density
a physical property; D=m/v; it is an intensive property of matter; depends on temp; it depends on the temperature of the smaple, usually the volume inc when the temp inc which dec the density.
intensive property
does not depend on quantity of matter: density, temp
extensive property
depends on quantity of matter: mass, volume
physical changes
the changes in physical properties. the identity of the substance is preserved.
chemical change/ chemical reaction
transformation of one or more atoms or molecules into one or more different molecules
qualitative
observations of rxns based on color and physical state
quantitative
measurements which involve numbers
SI units
(based on metric system) temp, length, mass, and time
fahrenheit b/f pt.
boling 212*F
180*F
Freezing 32*F
celsius b/f pt.
boiling 100*C
100*C
freezing 0*C
kelvin b/f pt.
boiling 373*K
100*K
freezing 273*K
kelvin formula
K= C+273
Celcius formula
C= K-273
C= (F-32)/1.8
Fahrenheit formula
F= (1.8)(C)+32
determinate error
caused by faulty instruments and/or human error
indeterminate error
inknown cause and cannot be controlled by the scientist.
error=
expt. detd. value - accepted value
percent error=
(error)/(accepted value)x 100