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22 Cards in this Set
- Front
- Back
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Characteristics of a good model
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able to explain results of already done experiment and correctly predict results of new experiment
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Dalton's Atomic Model
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Smallest part of elements= atoms, atoms join together to get molecules which are the smallest parts of compounds
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Atoms are....
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Indivisable and indestructable
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ABC'S of atomic literature
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Count numbers of atoms in a unit, decide if it is atom or molecule, use coefficent
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What sides are reactants on?
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left side
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what does "+" sign mean?
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blank reacts with blank
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-----> means to
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form, yield, or produce
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triangle means
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heat
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if there is a word above the arrow
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incopperate with "in the prescence of"
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Say in English: 2H(2)O(2) -----> 2 H(2)O+0(2)
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2 molecules of hydrogen peroxide decompose to produce 2 molecules of water and one molecule of oxygen
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Say in english: Ca+Br(2)-----> CaBr
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An atom of Calcium reacts with one molecule of bromine to produce calcium bromide.
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All matter is made up of....
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atoms
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Observation: Atoms cannot be seen, even with the most high powered microscope
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Explanation: Atoms are very small, huge numbers of them in small pieces of matter
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Elements have unchanging characteristic properties:
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All atoms in an element must be identical
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Different elements equal different characteristics properties
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All elements have to be different
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Elements form compounds which have their own characteristic properties, even though elements are still presents
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Atoms hof different elements may join together to make molecules of a compound
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MAs is conserved wihen elements unite to form compounds
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Atoms are indestructable, same number appears of both sides
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REactants and producrts of chemical reaction are always i in definite proportions
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The atoms in a molecule of a certain compound always joined in same ratio
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Gases are compressible/ solids and liquids are not. Solids can not pour and liquids and gases can
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Atoms behave like small hard objects, spread apart atoms
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Densities of solids and liquids are greater than those of gases
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Atoms are different amount of spaces apart
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Elements and compounds expand when heated
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atoms do not change size, but move apart
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1 element/compound may dissolve into another in its liquid form
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;liquids; spaces between the particles are large enough to allow other particles to occupy them
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