A Detailed Lesson Plan on the Types of Chemical Reaction
I.
OBJECITVES A. Content Standard
B. Performance Standard C. Learning Competency D. Specific Objectives
The chemical reactions associated with biological and industrial processes affecting life and the environment Using any form of media, present chemical reactions involved in biological and industrial processes affecting life and the environment. Apply the principles of conservation of mass to chemical reactions At the end of the lesson, the students should be able to: define a chemical reaction; identify the different types of chemical reaction; explain each types of chemical reactions; and give examples of chemical reaction they encounter everyday.
Types of Chemical Reactions II. CONTENT III. LEARNING RESOURCES A. References 1. Teacher’s Guide NONE pages 2. Learner’s Material pp.412-414. pages 3. Textbook pages pp.158- 160 B. Other Learning Different Types of Chemical Reactions Retrieved February 8, 2017 Resources from http://www.tutorvista.com/chemistry/4-types-of-chemicalreactions
The Four Major Types of Reactions. Retrieved February 8, 2017 from. http://www2.ucdsb.on.ca/tiss/stretton/CHEM1/stoich2.html
IV.
LEARNING PROCEDURE
Teacher’s Activity Routinary Activity Good afternoon class!
Student’s Activity
Good afternoon ma’am.
Before we start our class for today, kindly arrange (Students follow the instructions properly) your chairs properly and make sure that your places are well organized and distraction- free. Is anyone absent today? Okay good!
None ma’am. ma’am.
A. Reviewing previous lesson or presenting the new lesson
Last meeting, we discussed about Writing and Chemical equation illustrates the formulas Balancing Chemical Equation. Now will you define and quantities of reactants and products in a what is a chemical equation? chemical reaction. Okay correct! You have mentioned about reactants and products, will you differentiate the two?
Reactant are substances that start a chemical reaction (given on the left-hand side) while product are substances that are produced in the reaction (given on the right-hand side.)
Very good! Why is it important for us to Balance Chemical Equation?
In balancing chemical equation, we need to follow the law of conservation of mass where in the number of atoms of each elements in the reactant must be equal to the number of atoms of the element in the product.
Very well said. B. Establishing a purpose for the lesson
I have here sets of pictures and I want you to observe them properly. Based on your prior knowledge about chemical change, choose the picture that illustrates chemical change and give evidence of the chemical change.
(Students follow instructions.)
a. Change in color b. Change in color c. Production of light/ temperature change/change in color d. Change in odor e. Change in color f. Change ion color
Very good! All of those images illustrate chemical change because of the evidences present in their structure. Whenever there is a chemical change, we can say that there is always a chemical reaction. . Let us know more about chemical reactions. At the end of the lesson, the students should be able to: define a chemical reaction; identify the different types of chemical reaction; explain each types of chemical reactions; and give examples of chemical reaction they the y encounter everyday.
C. Presenting examples/ instances of the new lesson
What can you say about this picture?
The picture is all about the reaction of vinegar and baking soda because when this two combines together, small bubbles form.
Okay, how about the next picture?
It is a picture of a rusted nail.
Why do you think that nails get rust?
Nails get rust because they are being exposed to oxygen. It is all about the digestion of human ma’am.
Let us proceed to the last picture.
Do you ever wonder how the digestion of food takes Yes ma’am. place? Any idea class? As we put our food in our mouth, there is an enzyme in our saliva that breaks down sugars and other carbohydrates into simpler forms that our body can absorb. Very well said. All of the pictures I’ve shown are associated with our topic for today which is the Types of Chemical
Reaction. D. Discussing new concepts and practicing new skills #1 Types of Chemical Reaction 1. Combination Reaction- a reaction when two (2) or more reactants combine to form a single product. General formula: A+B AB Example: C(s) + O2 (g) CO2 (g) A + B AB Let try another example: What will be the product of nitrogen hydrogen gas when combine together? N2 (g) + 3H2 (g) ________
N2 (g) + 3H2 (g) 2NH3 (g)
2. Decomposition Reaction- in this reaction, a single reactant breaks down into simpler ones. (2 or more products). This is the reverse of combination reaction. General formula: AB A+B Examples: heat 2 HgO (s) 2 Hg(g) + O2 (g) AB A + B 2 AgBr (s) light 2 Ag (s) + Br 2 AB A + B Heat and light are just some of the factors that affect the chemical reaction. You will learn more about the factors affecting chemical reaction next meeting. Let us proceed to the next type pf chemical reaction. 3. Substitution Reaction- it is also called as single None, ma’am. ma’am. displacement reaction. In this reaction, a more active element replaces a less active element in the compound. General formula: A+BC AC + B The activity series of metals is being used in this type of chemical reaction. Take a look on the activity series in your book. [See Attachment] What do you think is the most reactive metal? Less reactive? Very good! The activity series is a list of elements arranged in decreasing order of reactivity. The most active element appears at the upper portion of the table.
Based from the activity series, the most reactive metal is the lithium and the less reactive metal is the gold.
Each element can replace any element below it in a compound that is by substitution. a.Displacement Reaction in Metals In a metal displacement reaction, a more active metal kicks out a less active metal from a compound. Example: Fe (s) + CuSO4 (aq) FeSO4 (aq) + Cu (s) A + B C A C + B b.Displacement Reaction in Halogen Just like in metals, more active halogens will displace less active halogens from a compound. Example: Cl2 (g) + 2 NaI (aq) 2 NaCl (aq) + I2 (s) A + BC B A +C c.Hydrogen Displacement Hydrogen can also be displaced from compounds by all alkali metals and even some alkaline earth metals. Examples: 2 Na (s) + 2 H 2O (l) 2 NaOH (aq) + H2 (g) A + B C A C + B Just like the above reaction, an explosion occurs because when hydrogen is displaced from water, it quickly forms hydrogen gas and 2 molecules of sodium hydroxide. 4. Double Displacement Reaction- it is characterized by the exchange of ions between two compounds. General formula: AB+CD AD+CB
Examples: NaCl (aq) + AgNO3 (aq) A B + C D
NaNO3 (aq) + AgCl (s) A D + C B
a. Acid-Base Reaction- it is a type of double displacement reaction that occurs between an acid and a base. The H+ ion in the acid reacts with the OH- ion in the base to form water and ionic salt. Example: HBr + NaOH NaBr + H2O Ionic salt + water b. Precipitation Reaction- it is the formation of a precipitate by mixing mix ing solutions of o f two soluble compounds.
This is an example of precipitate specifically a lead iodide precipitate.
Here is the chemical reaction in the formation of lead iodide as precipitate. Pb(NO3)2 + 2KI PbI2 + 2 KNO3 A B + CD AD + C B AgNO3 (l) + (l) + NaCl (l) AgCl (s) + (s) + NaNO3 (l) A B + C D A D + C B Any questions about the different types of chemical None ma’am. ma’am. reaction? E. Developing Mastery: Write the products of each chemical reaction, indicate their type of reaction and balance the chemical equation. Li + F2 LiF2 a. Li + F2 ______ -Combination Reaction b. CuCO3 ______ CuCO3 CuO + CO2 c. Na + CuCl2 _______ -Decomposition Reaction d. NaCl + Al2(SO4)3 _________ Na + CuCl2 NaCl2 + Cu -Single Displacement Reaction 6NaCl + Al2(SO4)3 3Na2 SO4 + 2AlCl3 -Double Displacement Reaction F. Finding practical applications of concepts and skills in daily living
Will you give some examples of chemical reaction Soap emulsifies grime, which means oily you encounter in your day to day life aside from the stains bind to the soap so they can be lifted pictures I’ve I’ve shown earlier? earlier? away with water. Very good, What else?
Brushing our teeth. Toothpaste neutralizes acid by using its basic ingredients to react with the acids in the mouth, neutralizing the negative effect of acid on the teeth.
Okay, correct. May we have one more?
When frying with unsaturated oils, hydrogenation of the oils can occur, and this can produce trans fatty acids, which are not good for our health
Very well said. G. Making generalizations and abstractions about the lesson Any volunteer who wants to summarize what we Chemical reaction, a process in which one have discussed today? or more substances, the reactants, are
converted to one or more different substances, the products. The different types of chemical reaction are combination reaction, decomposition reaction, single displacement, double displacement reaction, acid- base reaction and precipitation reaction. Very good! H. Evaluate Learning To check if you really understand un derstand our lesson, kindly Possible Answers: answer this worksheet quietly. [See Attachment] I. Additional activities for application or remediation Answer the following question correctly. Place it in your notebooks. 1. What are the different factors affecting reaction rates? 2. Explain each factor briefly.
