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20 Cards in this Set
- Front
- Back
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What kind of change is burning?
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Chemical.
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When a substance undergoes a chemical change...
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a chemical reaction is said to take place.
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In order to understand chemical reactions..
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one must first be able to describe them
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When charcoal burns, the carbon in the charcoal reacts with ..
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oxygen in the air to produce carbon dioxide and heat.
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Reactant
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in a chemical reaction, the substances that undergo chemical change.
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Products
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New substances formed as a result of a chemical reaction.
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Summarize reactions
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Reactants ---------> Products
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Shorten
Carbon + Oxysten yields Cabrons dioxide |
C + O2 ----> CO2
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Chemical Equation
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representation of a chemcial reactions in which the reactants and products are expressed as formulas.
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Established Principle that the mass of products is always = to mass of reactants
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French chemist Antoine Lavosier
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The law of conservation of mass states that
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mass is neither created nor destroyed in a chemical reaction
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To balance a chemical equation, first..
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count the atoms on each side of the equation
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Because chemical reactions often involve large numbers of small particles...
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chemists use a counting unit called the mole to measure amounts of a substance
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Mole
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An amount of a susbtance that contains approx. 6.02 x 10(23)<--(exponent) particles of that substance.
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Moles is aka...
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Avogadro's number
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Molar mass
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The mass of one mole of a substance
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Element molar mass
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same as its atomic mass expressed in grams
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Molar mass for a compound
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Add up atomic masses of its component atoms, and express the sum in grams
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Once you know the molar mass of a substance you can convert...
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moles of that substance into mass, or a mass of that substance into moles.
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In chemcial reactions, the mass of a reactant or product can be calculatd by..
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using a balanced chemical equation and molar masses of the reactants and products
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