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Chemical reaction is a process in which one or more substances are converted to one or more different substances. It is accompanied by one or more combination such as production of heat and light, formation of the precipitate, conversion of gas, observable change in color or temperature. An example of this is rusting of iron in which two substances reacting together to form a new one. When iron rust, iron molecules react with oxygen molecules to create a compound call iron oxide. Corrosion is a chemical change that happens in metals in which it is exposed to electrolyte such as water and oxygen. Thus, rusting of metals or irons occurs when it is either exposed to water or air.

References

Byju’s. (2022, July 4). So- rusting of iron is a chemical change or physical change-. https://byjus.com/question-answer/so-rusting-of-iron-is-a-chemical-change-or-physical-change/

Pechay, C. (2020). Science Quarter 4 – Module 3: Chemical Reaction (A. Alcantara, G. Baysic, & A. Tulagan, Eds.; 1st ed.) [DepEd Tambayan]. Departmen

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Chemical reaction or change is represented by symbolic representations which is called chemical equation. There are two parts in chemical equation the reactants and products. Reactants are the substances before the reaction and written on the left side of the chemical reaction. While, products are the substances resulting from a chemical reaction and presented at the right side of the chemical equation separated by an arrow called yield.

The following table below shows a list of symbols used in writing chemical equations.

1. + - indicates that the substances are added or mixed.

2. →- means "yields", "makes", "produces", "forms" separates the reactants from the products.

3. ↓- means that a precipitate is formed.

4. indicates that a gas has evolved.

5. (s)- designates that the reactants or products are in solid form.

6. (1)- designates that the reactants or products are in liquid form.

7. (g)- designates that the reactants or products are in gas form.

8. (aq) - designates an aqueous solution; the substance is dissolved in water.

9. heat - indicates that heat is supplied.

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References

Bayquen, A. (2007). Exploring life through Science Chemistry. Phoenix Publishing House, Inc.

Pechay, C. (2020). Science Quarter 4 – Module 3: Chemical Reaction (A. Alcantara, G. Baysic, & A. Tulagan, Eds.; 1st ed.) [DepEd Tambayan]. Department of Education. https://depedtambayan.net/wp-content/uploads/2022/05/SCI10-Q4-MOD3.pdf

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Looking at the picture above there are lots of chemical reaction that happens within our environment as well as within us. And this chemical changes happens to influence our daily living; for instance grilling a meat on griller, for us to cook the meat we need combustible materials such as wood a lighter to start a fire to cook the food. However, how are we going to identify which chemical reaction takes place?

Here are six types of chemical reaction such as combinations, decomposition, single displacement, double displacement, combustion reaction and acid- base reaction.

1. Combination or Synthesis Reaction- chemical union of two or more substances to produce single complex product. This chemical change follows this general formula A+ B→AB

Example: 2Na + Cl₂ → 2NaCl

2. Decomposition Reaction - this is the reverse process of synthesis reaction in which a compound is broken down into simpler compounds. The general equation for this chemical reaction is AB→ A+B

Example: CaCO₃ → CaO + CO₂

3. Single Displacement (Replacement) Reaction- a free element replaces another element in a compound. General equation is AB+C →AC+B

Example: Zn + CuSO₄ → ZnSO₄ + Cu

4. Double Displacement- a reaction which two reactants exchange its ions to form a new compound. This chemical reaction follows this chemical equation where as AB+CD→AC+BD

Example: BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

5. Combustion Reaction- a chemical reaction wherein oxygen gas combines with a compound containing carbon and hydrogen atoms; forming carbon dioxide and water. CnHn+O₂→CO₂ + H₂O

6. Acid-Base Reaction or Neutralization Reaction- is a special kind of double replacement reaction that occurs when an acid and base reacts. This forms salt and water as products. General equation: Acid+ Base→ Salt+ Water

Example: HCl + NaOH→ NaCl + H₂O

References

Admin. (2023, May 26). Types of Chemical Reactions - Detailed Explanation With Example &amp; Videos. BYJUS. https://byjus.com/chemistry/types-of-chemical-reactions/

Bayquen, A. (2007). Exploring life through Science Chemistry. Phoenix Publishing House, Inc.
Pechay, C. (2020). Science Quarter 4 – Module 3: Chemical Reaction (A. Alcantara, G. Baysic, & A. Tulagan, Eds.; 1st ed.) [DepEd Tambayan]. Department of Education. https://depedtambayan.net/wp-content/uploads/2022/05/SCI10-Q4-MOD3.pdf

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Instruction: Watch the video presented by clicking the title of each experiment and answer the following queries.

Reminder: Do not re-create the experiments at your home without the guidance of adults.

Experiments

Elephant Toothpaste

Fire snake Experiment

1. What are the chemicals used in the video?

2. Identify the type of chemical reaction in the video and explain how did it happen.

3. What are the products produced from the chemical reaction?

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Elephant Toothpaste Reaction I Simple Chemistry Experiment I Science Experiment Shorts | BYJU'S

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In this Experiment Shorts, we perform the world-famous Elephant Toothpaste reaction. Add some hydrogen peroxide, some dish soap, and food colours to a beaker...

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Instruction: Capture a picture that presents one of the types of chemical reaction. Identify what type of chemical reaction it is and explain the chemical process involved. Kindly follow the holistic criteria below and post your outputs here in our bulletin board.

Clear Imagery (5 points)- the image is clear, focus and allowing for easy to observation of the chemical reaction.

Description of Chemical Reaction (10 points)- There is a clear and accurate description of chemical reaction including its type and elaborate the process accordingly.

Proper Explanation (5 points)- Provides a concise and comprehensive explanation of the process involved in the chemical reaction and there is no omitted grammatical error.