Exothermic and Endothermic Reactions Flashcards

1
Q

Chemical Energy

A

-energy stored in the chemical bonds of a substance
-chemical reactions always involve energy changes
-making bonds and breaking bonds involve energy changes

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2
Q

Activation Energy

A

the energy required to break the bonds in the reactants for a chemical reaction to occur

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3
Q

How to identify if a reaction is exothermic?

A

If more energy is released than supplied

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4
Q

How to identify if a reaction is endothermic

A

if more energy is supplied than is released

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5
Q

Exothermic or Endothermic

A

based on the type of energy (heat) change involved, chemical reactions are classified as either Exothermic or Endothermic

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6
Q

Exothermic

A

-energy is released
-heat (energy) given off
-temperature of the substance rises
-products feel hot

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7
Q

Endothermic

A

-energy is absorbed
-heat (energy) taken in
-temperature of the substance drops
-products feel cold

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8
Q

endothermic reactions

A

reactants + energy = products
reactants + heat = products

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9
Q

endothermic formula

A

6CO2 + 6H2O + Energy - C6H12O6 + 6O2

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10
Q

exothermic formula

A

CH4 + 2O2 - CO2 + 2H2O + Energy

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11
Q

Example of exothermic

A

-combustion of fuels
-yeast & hydrogen peroxide
-Epson salts & water

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12
Q

Example of endothermic

A

-photosynthesis
-acidic acid & sodium bicarbonate

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