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Exothermic + Endothermic Reactions - Coggle Diagram
Exothermic + Endothermic Reactions
Features of Exothermic
Ex = Out (Exit)
Release energy
More bonds formed
A reaction that gets hot
Features of Endothermic
Reactions that get cold
En = In (Enterance)
Absorb energy
More bonds broken
Activation Energy
When particles collide they can either react or not
If there is a reaction, this is because the energy needed for the reaction comes from the moving particles
However if they don’t have enough energy to meet the activation energy the reaction will not occur
Activation energy is the energy needed to start a reaction
All particles have energy + are moving
Examples of Exothermic (Hot)
Heat pack
Respiration
Combustion reaction
Neutralisation
Oxidation
Examples of Endothermic (Cool)
Cool packs
Decomposition reaction
Photosynthesis
Citric acid + baking soda
Thermal decomposition
Differences of Exothermic and Endothermic
If more energy is SUPPLIED then is released then the reaction is ENDOTHERMIC.
A reaction is EXOTHERMIC if more energy is released then supplied.
COMBUSTION
Example = Burning of any kind of Wood or Coal to heat your home
It is an Exothermic reaction
A reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
Equation for COMBUSTION = Butane + Oxygen → carbon dioxide + water
EXOTHERMIC REACTION
Energy from the reacting chemicals is transferred to the surroundings, which often increase in temperature as a result.
ENDOTHERMIC REACTION
Energy from the surroundings is transferred to the reacting chemicals, causing the temperature of the surroundings to decrease.
Collisions
The collisions that happen between particles of the reactants must take place with enough energy.
This threshold amount of energy is called the activation energy
Particles of the reactants have to collide
ACTIVATION ENERGY =
The minimum amount of energy that reacting particles must have in order for a reaction to occur.
REACTION PROFILES
Reaction profiles show the progress of reaction on the x-axis and energy level on the y-axis. Reaction profiles tell us:
The amount of energy contained within the reactants and the products.
The activation energy of a reaction.
The overall energy change that happens as a result of a reaction.
An exothermic reaction is shown here.
CATALYSTS - REACTION PROFILES
Catalysts can increase reaction rates by lowering the activation energy, which increases the likelihood of successful collisions.