Chemical Substances, Reactions and Essential Resources(WJEC)

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Chemical Reaction

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20 Terms

1

Chemical Reaction

A process where reactants transform into products through the breaking and forming of chemical bonds.

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2

Evidence of a Chemical Reaction:

Bubbling or odor change or change in pH or changes in electrical conductivity

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3

Precipitate

A solid formed from a solution.

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4

Types of Energy Change

Exothermic (releases heat) or Endothermic (absorbs heat).

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5

Photo Reaction

Energy release as light.

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6

Combination/Synthesis Reaction

Simple substances combine to form a complex substance.

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7

Decomopisiton reaction

A compound breaks down into simpler substances.

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8

Displacement

One element replaces another in a compound.

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9

Electrons

Parts of two ionic compounds exchange.

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10

Combustion

Substance reacts with oxygen, releasing energy.

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11

Factors effecting rate of reaction

Concentration, Temperature, Surface Area, Catalysts, Inhibitors.

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12

Activation Energy

Minimum energy for reactants to form products.

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13

Catalyst

Lowers activation energy, increasing reaction rate.

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14

Energy in Chemical Reactions

Enthalpy

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15

EXOthermic

Release energy (heat).

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16

ENDOthermic

Absorb energy (heat).

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17

Spontaneity

Measure of disorder.

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18

Dynamic Equilibrium

Rates of forward and reverse reactions are equal.

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19

Le Chatlier’s Principle

System adjusts to minimize disturbances.

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20

Chromatography

Separating components based on movement through phases.

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