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Energy cannot be created This is the law of
or destroyed. It can only be conservation of energy.
transformed from one form
to another. The
surroundings
refers to
Energy can everything
take many outside of the
forms such chemical
as light or system.
heat.
The chemical
system is the
chemicals Enthalpy is the
and heat energy
reactants. stored in a
chemical
system.…read more

Slide 3

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Enthalpy change H can be worked out by:
H = Hproducts- Hreactants
This means in general all reactions either release heat
(exothermic) or absorb heat (endothermic)…read more

Slide 4

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Exothermic Reactions
The enthalpy of the
products is smaller
than the enthalpy of
the reactants.
There is a heat loss
from the chemical
system to the
surroundings.
We see this
as a rise in
temperature.…read more

Slide 5

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Endothermic Reactions
The enthalpy of the
products is greater than
the enthalpy of the
reactants.
Heat is absorbed by the
chemical system from the
surroundings.
We see this as
a drop in
temperature.…read more

Slide 6

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An enthalpy change varies depending on the conditions.
Enthalpy values such as those found in the data book are
found by carrying out experiments under standard conditions.
Pressure of Temperature
100kPa of 298 K…read more

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Comments

AChanzu

Maybe adding some answered exam questions using Hess' Law would've helped me understand it more.

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