Thermochemistry

Thermochemistry

Nurzuhaira Bt Mohd Sham C32

Let's study!

what is thermochemistry?

what are endothermic and
exothermic reactions?

what are the examples of
exothermic and
endothermic reactions?

Thermochemistry

The study of heat changes that occur
when chemical reactions take place.

Exothermic reaction Endothermic reaction
Heat is released into the surrounding Heat is absorbed from the surrounding

water and acid reaction nuclear reaction photosynthesis cake baking

Exothermic reaction Endothermic reaction

A rise in the reading of A drop in the reading of
the thermometer shows the thermometer shows
that heat is absorbed
that heat is released from the surroundings.
into the surroundings.

Exothermic Reaction

The contents in the container become hot. As a result, the container also
feels hot when touched or shows a higher temperature when measured
with a thermometer.
The total energy content of the product is less than the total energy
content of the reactants.

Endothermic Reaction

The contents in the container become cool. As a result, the container
also feels cool when touched or shows a lower temperature when
measured with a thermometer.
The total energy content of the product is more than the total energy
content of the reactant.

Exothermic reaction
used to release heat into the surrounding.
relieve muscle cramps
increase the size of the lumen in the blood capillaries so
that the rate of blood circulation through these
capillaries is increased.

Endothermic reaction

used to absorb heat from the surrounding.
can reduce the swelling of wounds
get rid of heat from inflamed tissues or body organs
reduce the size of the lumen in the blood capillaries so
that the rate of blood circulation through these
capillaries is reduced and this helps to stop bleeding.

Thank You!