DSERT - 8 - Science :: Chemical Reactions and their types
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[AUTHOR: GAYATHRI ARUN]
Dear Volunteer,
Please find below the detailed lesson plan and PPT for this chapter in the language mentioned against the respective link. While the lesson plan will give an overall flow of the lesson, the PPT will include lesson flow as well as the presentations for the class.
https://drive.google.com/open?id=1rC4ZVssuwQ8HrpEhsXToPHRNl4ziiYzf (Lesson Plan - English)
https://drive.google.com/open?id=1ah8Y59U6tUsGAkMNLe97fk5vsiuBBkYw(PPT - English)
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[Contributor - Anu Nived]
http://ktbs.kar.nic.in/New/website%20textbooks/class8/8th-english-science-1.pdf#page=139 (English Medium)
http://ktbs.kar.nic.in/New/website%20textbooks/class8/8th-kannada-science-1.pdf#page=139 (Kannada Medium)
[AUTHOR: GAYATHRI ARUN]
https://www.youtube.com/watch?v=yIJ2qnUOOwQ
https://www.youtube.com/watch?v=BgM3e8YZxuc
https://www.youtube.com/watch?v=T-TrQ3hsHjQ
https://www.youtube.com/watch?v=w4UjfZqo1M0
https://www.youtube.com/watch?v=vTq4sgGd2QU
https://www.khanacademy.org/science/chemistry/chemical-reactions-stoichiome/balancing-chemical-equations/v/balancing-chemical-equations-introduction
https://www.youtube.com/watch?v=4jISjQvdyhs
https://www.youtube.com/watch?v=4jISjQvdyhs
https://www.youtube.com/watch?v=-0DCopjuCwg
https://www.youtube.com/watch?v=K2MRZFCblss
https://www.youtube.com/watch?v=pEIQ93tQ-yo
https://www.youtube.com/watch?v=8Md_QVh87EI
https://www.youtube.com/watch?v=DVGaNxEM7M8
https://www.youtube.com/watch?v=bRfS-iV0LZQ
https://www.youtube.com/watch?v=74B3g1likkI
https://www.youtube.com/watch?v=CNbf4pF-Sq8
https://www.youtube.com/watch?v=N84XvlCzsYc
https://www.youtube.com/watch?v=kgMARnXlmBY
https://www.youtube.com/watch?v=rznIgkRcZZE
https://www.youtube.com/watch?v=NFarZmAbd8I
https://www.youtube.com/watch?v=Rn-YCZQJnOA
https://www.youtube.com/watch?v=yvyHVA1Ww_M
https://www.youtube.com/watch?v=XYRCXoFWPZw
https://www.youtube.com/watch?v=NaGQ9VI5mwg
https://www.youtube.com/watch?v=wIk28lNITX8
https://www.youtube.com/watch?v=br8lKynV1Hc
[AUTHOR: GAYATHRI ARUN]
ACTIVITY 1
Take some ice cubes in a beaker and expose it to sunlight for some time. Do the reverse and notice the changes.
ACTIVITY 2
Place some bright iron nails ina test tube half filled with water and examine after two or three days. The nails are covered with a reddish brown mass known as rust which has properties different from iron.
ACTIVITY 3
Classify the following into chemical and physical changes
1. Rusting of Iron
2. Ripening of fruit
ACTIVITY 1
Immerse an iron nail in copper sulphate solution for some time. You will observe the deposit of copper on iron nail. CuSO4 + Fe → FeSO4 + Cu
ACTIVITY 2
Take clear bleaching powder solution (which is a source of chlorine gas) in a test tube. Add potassium iodide solution. The solution turns pink due to the formation of iodine.
Cl2
+ 2KI → 2KCl + I2 ( ) Chlorine + ( ) Potassium iodide → ( ) Potassium chloride + ( ) Iodine In the above two examples a more reactive metal or non metal displaces a less reactive metal or non metal respectively from their compounds. These are examples for displacement reactions’. Can you arrange copper, iron and silver in the increasing order of the reactivity?
ACTIVITY 3
Observe the following reaction: Zn + H2SO4 → ZnSO4 + H2 (dilute) Identify the displaced element and displacing agent in the above reaction. In chemical displacement more reactive element displaces the less reactive element from their compounds.
ACTIVITY 4
Add sodium carbonate solution to magnesium sulphate solution in a test tube. We see a white precipitate of magnesium carbonate. MgSO4 + Na2CO3 → MgCO3 + Na2SO4
ACTIVITY 5
Add sodium carbonate solution to calcium chloride solution taken in a test tube.
We see a white precipitate of calcium corbonate
CaCl2 + Na2CO3 → CaCO3 + 2NaCl In the above two examples there is a mutual exchange of metallic and the non metallic parts. Such reactions are called double displacement or double decomposition reactions.
ACTIVITY 6
In the following example can you write the parts or radicals which are exchanged? MgCl2 + Na2CO3 → MgCO3 + 2 NaCl
ACTIVITY 7
Add Hydrochloric acid solution to Sodium Hydroxide solution (base) taken in a test tube. We come across the following double decomposition reaction. NaOH + HCl → NaCl + H2O
Acids and bases are identified by their action on litmus. Acid turn moist blue litmus to red while bases turn moist red litmus blue. Since the products formed as a result of the reaction between acids and bases are neutral to litmus, the reaction is called neutralization.
ACTIVITY 1
Immerse an iron nail in copper sulphate solution for some time. You will observe the deposit of copper on iron nail. CuSO4 + Fe → FeSO4 + Cu
ACTIVITY 2
Take clear bleaching powder solution (which is a source of chlorine gas) in a test tube. Add potassium iodide solution. The solution turns pink due to the formation of iodine.
Cl2
+ 2KI → 2KCl + I2 ( ) Chlorine + ( ) Potassium iodide → ( ) Potassium chloride + ( ) Iodine In the above two examples a more reactive metal or non metal displaces a less reactive metal or non metal respectively from their compounds. These are examples for displacement reactions’. Can you arrange copper, iron and silver in the increasing order of the reactivity?
ACTIVITY 3
Observe the following reaction: Zn + H2SO4 → ZnSO4 + H2 (dilute) Identify the displaced element and displacing agent in the above reaction. In chemical displacement more reactive element displaces the less reactive element from their compounds.
ACTIVITY 4
Add sodium carbonate solution to magnesium sulphate solution in a test tube. We see a white precipitate of magnesium carbonate. MgSO4 + Na2CO3 → MgCO3 + Na2SO4
ACTIVITY 5
Add sodium carbonate solution to calcium chloride solution taken in a test tube.
We see a white precipitate of calcium corbonate
CaCl2 + Na2CO3 → CaCO3 + 2NaCl In the above two examples there is a mutual exchange of metallic and the non metallic parts. Such reactions are called double displacement or double decomposition reactions.
ACTIVITY 6
In the following example can you write the parts or radicals which are exchanged? MgCl2 + Na2CO3 → MgCO3 + 2 NaCl
ACTIVITY 7
Add Hydrochloric acid solution to Sodium Hydroxide solution (base) taken in a test tube. We come across the following double decomposition reaction. NaOH + HCl → NaCl + H2O
Acids and bases are identified by their action on litmus. Acid turn moist blue litmus to red while bases turn moist red litmus blue. Since the products formed as a result of the reaction between acids and bases are neutral to litmus, the reaction is called neutralization.
[AUTHOR: GAYATHRI ARUN]
Version 1.1
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