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Chemistry the study of substances and the changes they undergo
central science overlaps all other sci
energy the capacity to do work
work the capacity to move an obj. over a distance against a resisting force
forms of energy kinetic, radiant, and potential
KE energy of motion
mechanical energy KE
thermal energy KE
random internal motion of particles KE
radiant energy from sun
potential stored energy
energy possessed by object because of position or arrangement of particles PE
measurement of energy calorie or joule
1 cal = 4.184 J
law of conserv. of energy in any process, energy is neither created nor destroyed
fossil fuels coal and petroleum and natural gas
measurement of temp. celcius and farenheit
kelvin scale SI unit of temp. (K)
c=k-? 273
absolute zero point at which the motion of particles of matter ceases
matter anything that has mass and volume
states of matter solid liquid gas plasma
chemical changes alter the identity of a substance
physical changes alter looks but not identity
type of change where new substance is created with new properties chemical change
sodium Na
Copper Cu
Lead Pb
Tungsten W
Iron Fe
Tin Sn
Potassium K
gold Au
Mercury Hg
SIlver Ag
------- can not be separated by physical or chemical means element
elements are abbreviated with symbols and letters
elements are organized on the periodic table
compound two or more elements chemically combined
pure substances elements and compounds- because they have a unique set of chemical and physical properties
specific heat capacity formula H= mc (delta) t
gasoline in car is ex. of ? energy potential
mixture substances that have come together but are not chemically combined
homogeneous undistinguishable
heterogeneous distinguishable
ways of seperation evaporation, crystallization, distilling, filtering, chromotog., centrifuge
heterogeneous mix. often seperated by filtration
seperating sand and water can be done by filtration
separating sugar from sugar water by crystallization
separation that takes advantage of boiling points is distillation
removing chlorophyll form leaves by chromo.
decompose water into h and o by electrolysis
crude oil into gas distillation
magnesium + oxygen magnesium oxide
iron + sulfur iron II sulfide
Created by: 778758220