CHEMISTRY: CHEMICAL REACTIONS AND EQUATIONS
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Last updated 12:57 AM on 7/30/22
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15 Terms
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Reactants
________ absorb energy as they become products, hence the products have more potential energy than the reactions.
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+ sign
A(n) ________ is used to separate each of the reactants and each of the products.
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Exothermic
________: processes that release thermal energy when they occur.
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exothermic reactions
In ________, the products have less potential than the reactants.
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Physical change
change in appearance of the starting material
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Chemical change
change of properties between the product and reactants
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Endothermic
processes that require energy in order to occur
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Endothermic changes include
The physical change of ice melting, food cooking, and evaporating liquid water
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Exothermic
processes that release thermal energy when they occur
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Examples include
the burning of carbon in oxygen and freezing of water
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Balanced Chemical Equation
C + O₂ → CO₂
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Unbalanced Chemical Equation
H₂ + O₂ → H₂O
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law of conservation of mass
states that matter is neither created nor destroyed in chemical reactions.
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product
substance that is produced by a chemical reaction
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reactant
substance that enters into a chemical reaction
