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14 examples of chemical reactions

A chemical reaction occurs when one or more compounds combine or transform into completely different compounds.

Chemical reactions are everywhere, not only in the specialized laboratories of industries, but also in the kitchen, in the environment and in the body.

Below we show you examples of chemical reactions that you will be able to recognize in your daily life.

1. Combustion reaction of cooking gas

flame of a kitchen by the reaction of the gas with the oxygen of the air

Propane C.3H8 is an organic compound that reacts with oxygen O2 from the air to produce carbon dioxide CO2, water vapor H2O and the energy used to heat food.

style size 16px bold C subscript bold 3 bold H subscript bold 8 bold plus bold 5 bold O subscript bold 2 bold arrow right bold 3 bold CO subscript bold 2 bold plus bold 4 bold H subscript bold 2 bold O bold plus bold heat end style

2. Oxidation-reduction reaction of car batteries

Car batteries are made from lead oxide PbO2 and sulfuric acid H2SW4. These react giving rise to an electrical current necessary to start the car.

The reaction that occurs results in lead sulfate PbSO4 and water:

style size 16px bold PbO subscript bold 2 boldest H subscript bold 2 bold SO subscript bold 4 bold right arrow bold PbSO subscript bold 4 bold plus bold H subscript bold 2 bold O end style

3. Stomach acid neutralization reaction with antacids

Stomach acid is hydrochloric acid HCl. Some antacids contain magnesium hydroxide Mg(OH)2. In the stomach, hydrochloric acid is neutralized by magnesium hydroxide to produce magnesium chloride and water in an acid-base reaction:

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bold Mg bold left parenthesis bold OH bold right parenthesis subscript bold 2 bold plus bold 2 bold HCl bold right arrow bold MgCl subscript bold 2 bold plus bold 2 bold H subscript bold 2 bold OR

4. Reaction of vinegar and eggshell

Vinegar is a solution of acetic acid CH3COOH, which is a weak organic acid. The egg shell is made of calcium carbonate CaCO3. When we put an egg in vinegar, we can see the appearance of some bubbles (carbon dioxide) and after a while the shell loses its rigidity.

The reaction that occurs between calcium carbonate and acetic acid produces calcium acetate CH3COOCa and carbon dioxide CO2:

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5. ethanol combustion

Ethyl alcohol or ethanol can be used as fuel. In countries such as the United States and Brazil, fossil fuels are being replaced by ethanol, as part of measures to reduce greenhouse gases. The reaction that occurs is:

bold C subscript bold 2 bold H subscript bold 5 bold OH bold more bold 3 bold O subscript bold 2 bold right arrow bold 2 bold CO subscript bold 2 bold plus bold 3 bold H subscript bold 2 bold EITHER

6. Hydrogen peroxide reaction on wounds

When we have a wound and we put hydrogen peroxide on ourselves, we almost immediately observe the appearance of bubbles. This occurs because in our blood cells we have an enzyme called catalase, which speeds up the decomposition reaction of hydrogen peroxide into water and oxygen:

bold 2 bold H subscript bold 2 bold O subscript bold 2 bold bold right arrow Catalase above bold 2 bold H subscript bold 2 bold O bold space bold plus bold O subscript bold 2

7. Addition Reactions for LEGO

lego blocks

A polymer is a substance made up of many smaller molecules joined together. These are produced by addition reactions. For example, the polymer acrylonitrile-butadiene-styrene or ABS is the substance with which LEGO blocks and 3D printed products are built.

The reaction occurs between styrene, butadiene and acrylonitrile:

bold H bold subscript 2 bold C bold equal bold CHC bold subscript 6 bold H bold subscript 5 bold plus bold space CH bold subscript 2 bold equals bold CH bold less bold CH bold equals bold CH subscript bold 2 bold space bold plus space bold CH subscript bold 2 bold equal bold CHC bold identical bold N bold right arrow bold space bold left parenthesis bold C subscript bold 8 bold H subscript bold 8 bold font. bold C subscript bold 4 bold H subscript bold 6 bold. bold C bold subscript 3 bold H bold subscript 3 bold N bold right parenthesis bold subscript n space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space bold space styrene bold space bold bolder space bold butadiene bold space bold more bold acrylonitrile bold right arrow bold Polymer bold space bold ABS

8. Ozone formation reaction

ozone or3 It is a compound that is abundant in the stratosphere, one of the layers of the Earth's atmosphere. This compound prevents the entry of harmful ultraviolet rays from the sun.

Ozone results from the combination of molecular oxygen O2 and elemental oxygen:

bold OR subscript bold 2 bold plus bold OR bold right arrow with bold Rays bold space bold UV above bold space bold OR subscript bold 3

9. Milk sugar degradation reaction

Milk contains a sugar, lactose, made up of galactose and glucose. Human beings have an enzyme, lactase, which is responsible for accelerating the chemical reaction of lactose decomposition as follows:

style size 16px bold C subscript bold 12 bold H subscript bold 22 bold O subscript bold 11 bold right arrow with bold Lactase above bold Galactose bold space bold plus bold space bold Glucose end style

Some people lose this enzyme when they become adults, so they no longer have the ability to digest milk.

10. neutralization reaction

Sodium Bicarbonate NaHCO3 is a weak base that when reacted with hydrochloric acid HCl produces the sodium chloride salt NaCl, carbon dioxide CO2 and water H2EITHER:

bold HCl bold space bold plus bold bold space NaHCO bold subscript 3 bold space bold right arrow bold space bold NaCl bold space bold plus bold H subscript bold 2 bold O bold space bold plus bold CO subscript bold 2

For this reason, when we drink water with bicarbonate, we can feel stomach discomfort due to the gas that is produced in this reaction.

11. esterification reaction

Esters are organic compounds with fruity odors. In manufactured food products these compounds are used to impart flavor. It is much cheaper to chemically produce esters than to extract them from the fruits that produce them.

For example, the smell of banana is due to pentyl ethanoate. This ester is produced from the reaction of ethanoic acid and pentanol, in the presence of sulfuric acid as a catalyst:

bold space bold space bold space bold space bold space bold space bold space bold space bold CH subscript 3 bold COOH bold space bold space bold space bold more bold space bold space bold C subscript bold 5 bold H subscript bold 11 bold OH bold space bold space bold bold space bold space bold space bold space bold space right arrow with bold H bold subscript 2 bold SW bold subscript 4 above bold bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space CH subscript bold 3 bold COOC subscript bold 5 bold H subscript bold 11 bold plus H bold subscript 2 bold O bold acidic bold space bold ethanoic bold space bold plus bold bold space pentanol bold right arrow with bold acid bold space bold sulfuric above bold pentylethanate bold space bold plus space bold water

12. baking powder reaction

spongy cupcakes due to the reaction of tartaric acid and bicarbonate

Baking powder and self-rising flour contain tartaric acid COOH(CHOH) among its ingredients.2COOH and sodium bicarbonate NaHCO3. When the temperature is increased when baking or cooking a recipe with these compounds, the reaction occurs with the release of carbon dioxide, which causes the cakes to rise:

style size 16px bold COOH bold left bracket bold CHOH bold right bracket subscript bold 2 bold COOH bold space bold plus bold space bold NaHCO subscript bold 3 bold right arrow with bold heat above bold 2 bold CO subscript bold 2 bold plus bold space bold 2 bold H subscript bold 2 bold O bold plus bold Na subscript bold 2 bold left parenthesis bold COO bold left parenthesis bold CHOH bold right parenthesis bold subscript 2 bold COO bold right parenthesis end style

13. ocean acidification reaction

carbon dioxide CO2 of the atmosphere dissolves in the water of the oceans and can react forming carbonic acid:

bold CO subscript bold 2 bold plus bold space bold H subscript bold 2 bold O bold right arrow over left arrow bold H subscript bold 2 bold CO subscript bold 3

This reaction is responsible for the decrease in the pH of the oceans, which implies alterations in the marine ecosystem.

14. Corrosion reaction of iron

Corrosion of iron-containing materials is accelerated in humid conditions. Iron and oxygen in the air react in the presence of water in an oxidation-reduction type reaction. The oxide that forms is hydrated iron oxide Fe2EITHER3.H2EITHER:

bold 2 bold Fe bold plus bold space bold O subscript bold 2 bold plus bold H subscript bold 2 bold O bold right arrow bold Fe bold subscript 2 bold O bold subscript 3 bold font. bold H subscript bold 2 bold O

You may also be interested in seeing:

  • Types of chemical reactions
  • Endothermic and exothermic reaction
  • types of chemical bonds
References

Commons, C., Commons, P (coordinators) (2020). Heinemann Chemistry 1, 5th ed. PearsonAustralia. Melbourne.

Moore, J.T. (2011) Chemistry for Dummies 2nd ed. Wiley Publishing. Indiana.

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