Combustion, oxidation and fermentation
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This document discusses three types of chemical reactions: combustion, oxidation, and fermentation. Combustion or burning occurs when a fuel such as wood or oil reacts with oxygen, turning the fuel into ashes/smoke or kinetic energy/gases. Oxidation is the reaction of oxygen with another substance like iron or food, producing rust or browning of food. Fermentation is caused by fungi and bacteria changing organic substances into other products like alcohol or lactic acid, and it is used to produce foods and drinks through natural and preservation processes.
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Combustion, oxidation and fermentation
- 1. CHEMICAL REACTIONS by Andrés Arévalo
- 2. COMBUSTION OR BURNING What is it? Wood combustion During wood combustion, fuel turns into heat, ashes and smoke. ExamplesHow does it work? Oil combustion During oil combustion, fuel turns into kinetic energy and gases. It is a chemical reaction because a new substance is produced/created. In combustion, oxygen REACTS with a FUEL. This fuel can be : wood or oil.
- 3. Ashes. Coal. Smoke. Movement (kinetic energy) and gases. At the beginning we have wood. When wood reacts with oxyen, it turns into: At the beginning we have oil. When oil reacts with oxyen, it turns into:
- 4. OXIDATION What is it? ExamplesHow does it work? Food oxidation It is a chemical reaction because a new substance is produced. In oxidation, oxygen reacts with a substance when the substance is exposed to air. It happens in iron, foods, etc. Iron oxidation During iron oxidation, the new substance that we get is called RUST. During food oxidation, the oxygen turns the food brown.
- 5. At the beginning we have an iron key. When iron reacts with oxygen, it turns into: Rust At the beginning we have a green apple. When we bite it, it reacts with oxygen... And it becomes an oxidized apple.
- 6. FERMENTATION What is it? ExamplesHow does it work? Fermentation in drinksIt is a chemical reaction because FUNGI and BACTERIA change organic substances into other substances. Fermentation in foods Fungi produce alcohol. Bacteria produce lactic acid. Natural fermentation Fermentation to preserve foods
- 7. FERMENTATION IN FOODS Cheese, bread or yoghurt are produced through fermentation.