C7

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Exothermic Reactions -
Energy transferred to the surroundings / Neutralisation and combustion / Reactants have higher energy than products / Bond Making
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Endothermic Reactions -
Energy transferred into reacting chemicals / Thermal decomposition / Products have higher energy than reactants / Bond Breaking
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Uses of Exothermic Reactions -
Heating Packs and hand warmers / Self heating cans
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Uses of Endothermic Reactions -
Used for cold packs for sports injuries
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Reaction profiles -
A representation of the energy changes and chemical changes during a chemical reaction
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Reaction Profile - Exo
Starts at higher energy / Increases to activation energy level / Decreases steeply until lower than original energy / Energy is lost to surroundings
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Reaction Profile - Endo
Starts at lower energy / Increases to the activation energy level / Decreases slightly to form products / Energy is taken in
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Activation Energy -
The minimum amount of energy required to start a chemical reaction
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Bond Energy -
The energy needed to break the bonds between atoms / Calculated by adding the total bond energy of all of the bonds for reactants and products
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Spectator Ions -
Do not change in a chemical reaction / Are present in an identical form in both reactants and products
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Cells -
Metals with different reactivities make current / The Greater the difference in reactivity, the greater the voltage / Electrons flow through electrodes and the electrolyte / Produce no electricity once reactants are used up / Irreversible reaction
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Batteries -
Batteries are made of a combination of Cells joined together in series
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Rechargeable batteries -
Use a reversible reaction / Once all of the reactants react, electricity can be applied to the circuit to reverse the reaction
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Hydrogen Half Equation -
2H₂ --> 4H+ + 4e-
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Oxygen Half Equation -
O₂ + 4H+ + 4e- --> 2H₂O
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Hydrogen Fuel Cells - Full Equation
2H₂ + O₂ --> 2H₂O
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Hydrogen Fuel cells -
Produce no pollutants / Production of hydrogen uses fossil fuels / Hydrogen is flammable and hard to store / Water produced can be used
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Other cards in this set

Card 2

Front

Energy transferred into reacting chemicals / Thermal decomposition / Products have higher energy than reactants / Bond Breaking

Back

Endothermic Reactions -

Card 3

Front

Heating Packs and hand warmers / Self heating cans

Back

Preview of the back of card 3

Card 4

Front

Used for cold packs for sports injuries

Back

Preview of the back of card 4

Card 5

Front

A representation of the energy changes and chemical changes during a chemical reaction

Back

Preview of the back of card 5
View more cards

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