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intro to chem

ecm, phys and chem prop/changes

TermDefinition
pure substance a substance made up of one type of element or compound that cannot be broken down by physical separation methods (boiling, filters, magnets). it can be broken down or changed chemically
example of a pure substance water
element a pure substance that cannot be broken down chemically into a simpler, stable, substance. made up of one type of atom
atom the smallest unit of an element that maintains the chemical identity of that element
examples of elements -oxygen -magnesium
compound a substance made up of atoms of two or more different elements joined by chemical bonds
examples of compounds -carbon dioxide -sodium chloride -sugar
mixture a substance made up of more that one type of pure substance that can be broken down by physical separation methods (boiling, filters, magnets).
homogenous mixture a mixture in which the substances are uniformly distributed (also called a solution) (appear as one substance)
heterogenous mixture a mixture in which the substances are NOT uniformly distributed (you can "see" the pieces)
example of a heterogenous mixture oil and water
example of homogeneous mixture salt water
extensive properties DO depend on amount of matter
examples of extensive properties mass, length, volume
intensive properties independent of amount of matter (used to identify substances)
examples of intensive properties density, boiling point, color, reactivity
What are the signs of a chemical change? color, odor, precipitate, light/temperature, gas
What's an example of something that looks like a chemical change but is actually physical? boiling water (bubbles)
How does a substance compare after a chemical change has occurred? the products have different properties than the reactants
How does a substance compare after a physical change has occurred? properties remain unchanged
What have chemical formulas? compounds
Created by: shreyr
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