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Introduction to ChemistryMatter
What is Chemistry?In your own words, please write down how you would define the following words:
Biology
Physics
Chemistry
What is Chemistry?
Biology
Physics
Chemistry
The study of living organisms
The study of forces & motion
The study of matter and its reactions and properties
Matter
Matter
Elements
Type of matter that cannot be broken down into simpler, stable substances and is made of only one type of atom
Compounds
A pure substance that contains two or more elements whose atoms are chemically bonded
Compounds
Fixed compositions A given compound contains the same elements
in the same percent by mass
Compounds
The properties of a compound are VERY DIFFERENT from the properties of the elements they contain
Ex.) Sodium Chloride (NaCl) vs. Sodium & Chlorine
Sodium: http://www.youtube.com/watch?v=RAFcZo8dTcU
http://www.youtube.com/watch?v=92Mfric7JUc
Electrolysis
Mixtures
A blend of two or more kinds of matter, each of which retains its own identity and properties
Homogeneous
Heterogeneous
Homogeneous MixturesComposition is the same throughout the
mixtureExamples: salt water, soda water, brass
A.k.a. a solutionSolute in a solvent (salt dissolved in water)
Heterogeneous Mixtures
Non-uniform; composition varies throughout the mixture
Separating Mixtures
Filtration
Separating MixturesDistillation
Separating Mixtures
Chromatography