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Intro to Chem

Chapter 1

TermDefinition
Matter Anything that has mass and occupies space
Mass >Measurement of the amount of matter in an object
Weight Measurement of the gravitational force acting on the object
Physical Change Do not change the composition of the substance
Chemical Change Change in matter leads to change in composition
Physical Properties Properties of matter that can be observed or measured without attempting to change the composition of the matter being observed.
Chemical Properties Properties that matter demonstrates when attempts are made to change the matter into new substances.
Molecule Smallest particle of a substance that has the properties of that substance and is capable of a stable independent existence
Atoms Limit of chemical subdivision for matter
Classification of molecules Di= 2 atoms Tri= 3 atoms Poly= More than 3 Homo= Only 1 kind of atom Hetero= Contains 2 or more kinds of atoms
Mixture Portions of compound may vary Properties vary with composition Can be physically separated into two or more pure substances
Pure substances
Homogenous Matter Matter that has the same properties throughout the sample Solutions; Homogenous mixtures of two or more pure substances.
Heterogeneous Matter Matter with properties that are not the same throughout the sample. Properties of a sample depends on the location from which the sample was taken
Elements Pure substances that are made up of homoatomic molecules or individual atoms of the same kind.
Compounds Pure substances that are made up of heteroatomic molecules or individual atoms of two or different kinds.
Metric Base= 1 meter Larger Unit= 1 kilometer= 1000 meters Smaller Unit= 10 decimeters= 1, 100 centi= 1 meter, 1000 milli = 1 meter.
English Base= 1 yard Larger unit 1 mile=1760 yards Smaller unit= 3 feet= 1 yard, 36 inches = 1 yard
Temperature scales Fahrenheit, Celsius, Kelvin
Scientific Scales Celsius and Kelvin
Fahrenheit to Celsius C= 5/9 (F-32)
Celsius to Fahrenheit F= 9/5 (C) + 32
Kelvin to Celsius Celsius = Kelvin- 273
Celsius to Kelvin K= C+273
Created by: ksuits00