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CHEMISTRY: CHEMICAL REACTIONS AND EQUATIONS
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Chemistry
CHEMISTRY REGENTS
REGENTS
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15 Terms
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1
Reactants
________ absorb energy as they become products, hence the products have more potential energy than the reactions.
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2
+ sign
A(n) ________ is used to separate each of the reactants and each of the products.
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3
Exothermic
________: processes that release thermal energy when they occur.
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4
exothermic reactions
In ________, the products have less potential than the reactants.
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5
Physical change
change in appearance of the starting material
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6
Chemical change
change of properties between the product and reactants
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7
Endothermic
processes that require energy in order to occur
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8
Endothermic changes include
The physical change of ice melting, food cooking, and evaporating liquid water
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9
Exothermic
processes that release thermal energy when they occur
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10
Examples include
the burning of carbon in oxygen and freezing of water
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11
Balanced Chemical Equation
C + O₂ → CO₂
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12
Unbalanced Chemical Equation
H₂ + O₂ → H₂O
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13
law of conservation of mass
states that matter is neither created nor destroyed in chemical reactions.
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14
product
substance that is produced by a chemical reaction
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15
reactant
substance that enters into a chemical reaction
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