CHEMISTRY: CHEMICAL REACTIONS AND EQUATIONS

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Reactants

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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
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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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