THERMOCHEMISTRY (PHOTOSYNTHESIS AND RESPIRATION)

By AlifSyaqir | Updated: Feb. 12, 2018, 10:29 a.m.

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Exothermic and endothermic
PHOTOSYNTHESIS & RESPIRATION
Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the sun, into chemical energy that can be later released to fuel the organisms' activities. This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water.
WHAT IS PHOTOSYNTHESIS?
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HOW DOES IT RELATE TO THERMOCHEMISTRY?
Plants store energy through the endothermic reactions of photosynthesis.Living things can release energy through a series of Exothermic reactions called Respiration. The energy stored in plants through photosynthesis can also be released in other ways. Consider energy from fossil fuels.
Fossil fuels include petroleum, natural gas, and coal. These substances are formed from fossilized materials, mainly plants. The materials had been under high pressures and temperatures for millions of years.When these plants were alive, they used photosynthesis to produce glucose and other molecules from carbon dioxide and water.The energy stored in the bonds of these molecules remains, even though the molecules have changed over time.
Photosynthesis is an example of an endothermic chemical reaction. In this process, plants use the energy from the sun to convert carbon dioxide and water into glucose and oxygen. This reaction requires 15MJ of energy (sunlight) for every kilogram of glucose that is produced. Plants store energy through the endothermic reactions of photosynthesis.Living things can release energy through a series of Exothermic reactions called Respiration. The energy stored in plants through photosynthesis can also be released in other ways. Consider energy from fossil fuels.
carbon dioxide + water + light energy ---> glucose + oxygen
glucose + oxygen---> carbon dioxide + water + energyen + water

Unlike many other endothermic reactions, photosynthesis does not absorb energy as heat. Instead, during plants absorb energy from sunlight to turn carbon dioxide and water into oxygen and glucose, which is a type of sugar molecule. The energy is stored in the glucose molecules, ready to be used when needed.
A large amount of the energy we use on Earth comes from the Sun. This energy includes energy in fossil fuels such as coal and petroleum, as well as energy obtained from food. In all of these cases, the energy in sunlight is stored by endothermic reactions. When the energy is needed, it is released by exothermic reactions.
This combination of reactions forms a cycle of energy storage and use. For example, examine the photosynthesis equation at the top of the page. If you look at this equation in reverse—that is, if the direction of the arrow is reversed—it is a combustion reaction, with oxygen and glucose as the reactants, and it is exothermic.
Water evaporating is a common form of endothermic reaction.The water takes the heat to from a liquid to gas. So the water in the sweat evaporates by using the heat in the body,therefore it cools the body, 
THANK YOU FOR WATCHING
THE DEGENERATE ORBITALS

ALIF SYAQIR
SYAIDATUL ALYA 
NURUL HIDAYAH
SATISHVARAN

THERMOCHEMISTRY (PHOTOSYNTHESIS AND RESPIRATION)

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