K.V.O.F.DUM DUM KOL
LESSON PLAN
CLASS X
SUBJECT :
SCIENCE
MAIN TOPIC:
CHEMICAL REACTIONS & EQUATIONS
SUB: TOPIC: TYPES OF CHEMICAL EQUATIONS
Materials: Chemistry lab ( Teacher Demonstration &
Group Activity based on NCERT Book )Activity room for
ICT , Worksheet on Types of Reactions
TEACHER ORIENTED REPORT: Chemical Reaction:-The transformation of chemical substance into another
chemical substance is known as Chemical Reaction. For example: rusting of iron, setting of milk into curd, digestion
of food, respiration, etc.
In chemical reaction new substance is formed which is completely different in properties from the original substance,
so in a chemical reaction chemical change takes place.
Following are the signs of chemical reaction:
(a) Change of state of substance.
(b) Change of colour of substance.
(c) Evolution of heat.
(d) Absorption of heat.
(e) Evolution of gas.
(f) Evolution of light.
Types of Chemical Reaction
Chemical reactions can be classified in following types:a. Combination Reactions
b. Decomposition Reactions
c. Displacement Reactions
d- Double displacement Reaction
e. Oxidation and Reduction Reactions
All chemical reactions can be placed into one of six categories. Here they are, in no particular order:
1) Combustion: A combustion reaction is when oxygen combines with another compound to form water and
carbon dioxide. These reactions are exothermic, meaning they produce heat. An example of this kind of
reaction is the burning of napthalene:
C10H8 + 12 O2 ---> 10 CO2 + 4 H2O
2) Synthesis: A synthesis reaction is when two or more simple compounds combine to form a more
complicated one. These reactions come in the general form of:
A + B ---> AB
One example of a synthesis reaction is the combination of iron and sulfur to form iron (II) sulfide:
8 Fe + S8 ---> 8 FeS
3) Decomposition: A decomposition reaction is the opposite of a synthesis reaction - a complex molecule
breaks down to make simpler ones. These reactions come in the general form:
AB ---> A + B
One example of a decomposition reaction is the electrolysis of water to make oxygen and hydrogen gas:
2 H2O ---> 2 H2 + O2
4) Single displacement: This is when one element trades places with another element in a compound. These
reactions come in the general form of:
A + BC ---> AC + B
One example of a single displacement reaction is when magnesium replaces hydrogen in water to make
magnesium hydroxide and hydrogen gas:
Mg + 2 H2O ---> Mg(OH)2 + H2
5) Double displacement: This is when the anions and cations of two different molecules switch places,
forming two entirely different compounds. These reactions are in the general form:
AB + CD ---> AD + CB
One example of a double displacement reaction is the reaction of lead (II) nitrate with potassium iodide to
form lead (II) iodide and potassium nitrate:
Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3
6) Acid-base: This is a special kind of double displacement reaction that takes place when an acid and base
react with each other. The H+ ion in the acid reacts with the OH- ion in the base, causing the formation of
water. Generally, the product of this reaction is some ionic salt and water:
HA + BOH ---> H2O + BA
One example of an acid-base reaction is the reaction of hydrobromic acid (HBr) with sodium hydroxide:
HBr + NaOH ---> NaBr + H2
STUDENTS ORIENTATION REPORT:
Student will know that In chemical reaction new substance is formed which is completely different in properties from
the
original
substance
So
in
the
chemical
reaction
chemical
change
takes
place.
CLICK TO THE LINK & KNOW MORE ABOUT CHEMICAL REACTIONS
Types of chemical reactions
.http://www.watchknowlearn.org/Video.aspx?VideoID=11933&CategoryID=2497
www.youtube.com/watch
REDOX-REACTION
www.youtube.com/watch
PRECIPATE-REACTION
www.youtube.com/watch
video types of chemical reaction
https://www.youtube.com/watch?v=nsEkKIiOz7Q
http://www.schooltube.com/video/0bbcb832f2344f27b996/
http://www.chem4kids.com/files/react_intro.htmlhttp://www.chem4kids.com/files/react_intro.html
QUIZ
http://www.softschools.com/quizzes/science/chemical_reactions/quiz380.html
CONCEPT DETAILS, : To understand the difference between four different types of chemical reactions: composition,
synthesis, single replacement and double replacement. Students should be able to identify the type of reaction and
predict the products of these types of reactions
ACTIVITIES FOR THE TOPIC: Alternative/Supplemental Activities: The teacher could demonstrate the different
types of reactions by showing an example of each type of reaction Students could also perform some Group
activities to observe the different types of reactions taking place. identify the type of reaction & products of the
reactions.
ACTIVITY 1.3 Take a few zinc granules in a conical flask or a test tube.
Add dilute hydrochloric acid or sulphuric acid to this
CAUTION: Handle the acid with care.
Do you observe anything happening around the zinc granules?
Touch the conical flask or test tube. Is there any change in its temperature?
DIAGNOSTIC QUESTIONS: OR LEARNING OUTCOME :
Answer the following questions on the basis of observations made during the demonstration.
Ql. What did you observe happening at the bottom of the test tube in the activity performed?
Q2. Did you feel any change in the temperature on touching the bottom of the test tube?
Q3. Suggest whether the heat is being released or absorbed during the process of the
activity?
Q4.What observations tell us that addition of dilute acid to zinc granules leads to a chemical change?
Q5.Give example of one physical and one chemical change from your daily life?
LEVEL WISE ASSESSMENT :
Q1- Write the types of reaction ? Explain any one reaction with the help of Activity?
Q1.2 Which among the following changes are exothermic or endothermic in nature?
(a) Decomposition of ferrous sulphate
(b) Dilution of sulphuric acid
(c) Dissolution of sodium hydroxide in water
(d) Dissolution of ammonium chloride in water
Q2-What does one mean by exothermic and endothermic reactions? Give examples.( Activity)
Q2.2 A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed.
Write the chemical reaction involved and also mention the type of the chemical reaction?
Q3-Why is respiration considered an exothermic reaction? Explain.
Q3.2 Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning
sulphur. Write the chemical reaction involved and identify the type of reaction.
FORMATIVE ASSESSMENT
Q1-List what type the following reactions are:
1) NaOH + KNO3 --> NaNO3 + KOH
2) CH4 + 2 O2 --> CO2 + 2 H2O
3) 2 Fe + 6 NaBr --> 2 FeBr3 + 6 Na
4) CaSO4 + Mg(OH)2 --> Ca(OH)2 + MgSO4
5) NH4OH + HBr --> H2O + NH4Br
6) Pb + O2 --> PbO2
7) Na2CO3 --> Na2O + CO
Q2- Why are decomposition reactions called the opposite of combination reactions?
Write equations for these reactions.
PROJECT: Should we use fire crackers during Diwali? Discuss methods to decrease air pollution during Diwali? . (
for group 2,4,& 6 )
OR
To investigate the effect of oxygen & carbon di oxide on the rate of breathing in an aquatic animals .(for group 1,3,&
6)