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C7 Energy changes- exothermic and endothermic reactions - Coggle Diagram
C7 Energy changes- exothermic and endothermic reactions
Energy transfer during exothermic and endothermic reactions
Required practical activity 10:
investigate the variables that affect temperature changes in reacting
solutions such as, eg acid plus metals, acid plus carbonates, neutralisations, displacement of metals.
method
exothermic reactions
effect on the temperature of the surroundings
example reactions (ie applications)
examples of every day uses
how do hand warmer work?
endothermic reactions
effect on the temperature of the surroundings
example reactions (ie applications)
examples of every day uses
how do cooling packs work?
Reaction profiles
draw and label the reaction profile for an exothermic reaction
draw and label the reaction profile for an endothermic reaction
what is activation energy?
The energy change of reactions
energy must be
supplied
to
break bonds
in the reactants
is bond breaking endothermic or exothermic?
energy is
released
when bonds in the products are
formed
is bond making endothermic or exothermic?
the difference between the sum of the energy needed to break bonds in the reactants and the sum of the energy released when bonds in the products are formed is the overall energy change of the reaction
what is bond energy?
write balanced symbol equations and calculate the energy changes for the following, using these bond energies- H-H 436kJ/ml, Cl-Cl 243kJ/mol, H-Cl 432kJ/mol, O=O 498kJ/mol, H-O 464kJ/mol
hydrogen + chlorine > hydrogen chloride
hydrogen + oxygen > water