CBSE Class 9 Science Lab Worksheet Different Chemical Changes

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Different Chemical Changes Science Worksheet for Class 9

Class 9 Science students should refer to the following printable worksheet in Pdf in Class 9. This test paper with questions and solutions for Class 9 Science will be very useful for tests and exams and help you to score better marks

Class 9 Science Different Chemical Changes Worksheet Pdf

DIFFERENT CHEMICAL CHANGES
 
Reaction of iron with copper sulphate
 
(a) Iron with copper sulphate solution
 
Objectives: To study the reaction of iron with copper sulphate
 
Requirements: Iron nails, thread, test tubes, copper sulphate, distilled water, spatula, TT stand, sand paper, etc.
 
Points to remember:
 
1. Colour of pure iron is greyish
 
2. Colour of pure copper is brownish.
 
3. Aqueous solution of copper sulphate is blue due to the presence of Cu2+ ions and ferrous sulphate is light green due to the presence of Fe2+ ions.
 
4. Fe is more reactive than Cu. Due to their difference in reactivity, copper get deposited on iron when iron is kept in a solution of copper sulphate and metallic iron dissolves in water to form iron sulphate.
 
5. This is an example of a single displacement reaction.
 
Procedure:
 
1. Take 10 ml each of copper sulphate solution in two test tubes and keep on a TT stand.
 
2. Take two iron nails and clean them using a sand paper to remove any rust.
 
3. Put one iron nail in one of the test tubes.
 
4. After 15 minutes, take out the iron nail keep it on a filter paper next to the clean iron nail and compare them. Compare also the solutions in both the test tubes.
 
5. Record your observation in the following table.
 
 CBSE Class 9 Science Lab Worksheet Different Chemical Changes 1
 
Conclusions:
 
Fe displaces Cu from CuSO4 and forms FeSO4 in the solution hence the colour of the solution changes from light blue to pale green. The displaced copper gets deposited on iron nail. It appears as brown coating on iron nail
 
Precautions:
 
1. Iron nail should be clean; otherwise impurity such as rust will cause interference to the expected reaction.
 
2. During the experiment the test tube should not be disturbed. (The deposit of copper might fall off)
 
3. More the time taken better will be the result
 
(b) Burning of Magnesium in air
 
Objectives: To study the burning of Mg in air
 
Requirements: A strip of Mg ribbon, a pair of tongs, china dish, Bunsen burner, litmus paper, match box etc.
 
Points to remember:
 
1. Mg is an active metal.It combines with oxygen to form magnesium oxide.
 
2. The reaction is an example of direct combination reaction.
 
3. MgO on dissolving (It is only partially soluble) in water gives a base magnesium hydroxide.
 
4. Both MgO and Mg(OH)2 turn red litmus blue.
 
Procedure:
 
1. Take a clean strip of Mg ribbon and burn it by showing to a Bunsen flame with the help of a pair of tongs.
 
2. Collect the white powder that is formed during burning in a china dish
 
CBSE Class 9 Science Lab Worksheet Different Chemical Changes 2
Conclusions:
 
1. When Mg burns in air, it combines with oxygen (of air) to form a white powder of magnesium oxide. & MgO is basic in nature.
 
Precautions:
 
1. Mg ribbon should be clean
 
2. Avoid looking directly at the flame when the Mg ribbon burns as the intensity of the flame may damage your eye sight.
 
3. A pair of tongs should be used to hold the Mg ribbon while burning.
 
4. The white powder formed should not come in contact with your body partsReaction of Zinc with sulphuric acid
 
(c) Zinc with Dil.Sulphuric acid
 
Objectives: To study the chemical reaction between Zn and dil H2SO4 acid.
 
Points to remember:
 
1. Zn is an active metal. It has two valance electrons.
 
2. H2 is less reactive than Zn, so the following reaction takes place when Zn comes in contact with acid.
 
3. This reaction is an example of a single displacement.
 
 CBSE Class 9 Science Lab Worksheet Different Chemical Changes 3
 
Precautions:
 
1. Sulphuric acid should be handled carefully.
 
2. Use clean Zn granules.
 
Conclusion:
 
Zn is more reactive than hydrogen.
 
(d)Heating of Copper sulphate
 
Objective : To study the chemical reaction when hydrated copper sulphate is heated.
 
Apparatus: Test tubes ,bunsen burner ,hydrated copper sulphate,tongs ,spatula etc
 
Theory : The hydrated copper sulphate loses its water of crystallisation on heating
 
CuSO4.5H2O   →     CuSO4 + 5H2O
 blue                              white
 
• It is a reversible chemical reaction
 
Procedure:
 
CBSE Class 9 Science Lab Worksheet Different Chemical Changes 4
 
 
• Use safety goggle while heating..
 
• Be careful when you handle hot objects.
 
(e) Reaction between Sodium sulphate &Barium chloride
 
Objectives: To study the chemical reaction between Sodium sulphate and Barium Chloride.
 
Requirements: Solutions of Na2SO4 & BaCl2, test tubes etc.
 
Points to remember:
 
1. Sodium sulphate contains 2 sodium ions and one sulphate ion.
 
2. On mixing the solutions a double displacement reactions takes place.
 
CBSE Class 9 Science Lab Worksheet Different Chemical Changes 5
 
Questions:
 
1. What is meant by displacement reaction? (Ans: A stronger element displaces a weaker element from its compound)
 
2. Which is more reactive? Copper or iron and why? (Ans: Fe is more reactive as it displaces Cu from its compounds)
 
3. Which is more reactive? Copper or iron and why? (Ans: Fe is more reactive as it displaces Cu from its compounds)
 
4. Which is more reactive? Copper or iron and why? (Ans: Fe is more reactive as it displaces Cu from its compounds)
 
5. What is the colour of copper sulphate solution before the experiment? (Blue/Peacock blue)
 
6. Which out of the following get coated on iron nail? What is its colour? (Copper oxide, copper sulphate, copper sulphide, copper metal) [Reddish brown ]
 
7. Why it is not advised not to look directly at the flame of a burning Mg piece? (Ans: intense dazzling flame may damage retina)
 
8. What is the colour of barium chloride solution? What is the colour of barium sulphate precipitate?
 
 
 
 
Please click on below link to download CBSE Class 9 Science Lab Worksheet Different Chemical Changes
Chapter 01 Matter in Our Surroundings
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set A
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set B
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set C
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set D
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set E
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set F
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set G
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set H
CBSE Class 9 Science Matter in Our Surroundings Worksheet Set I
Chapter 02 Is Matter Around Us Pure
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set A
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set B
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set C
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set C
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set D
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set D
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set E
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set E
CBSE Class 9 Science Is Matter Around Us Pure Worksheet Set F
Chapter 03 Atoms and Molecules
CBSE Class 9 Science Atoms and Molecules Worksheet Set A
CBSE Class 9 Science Atoms and Molecules Worksheet Set B
CBSE Class 9 Science Atoms and Molecules Worksheet Set C
CBSE Class 9 Science Atoms and Molecules Worksheet Set D
CBSE Class 9 Science Atoms and Molecules Worksheet Set E
CBSE Class 9 Science Atoms and Molecules Worksheet Set F
CBSE Class 9 Science Atoms and Molecules Worksheet Set G
CBSE Class 9 Science Atoms and Molecules Worksheet Set H
Chapter 04 Structure of the Atom
CBSE Class 9 Science Structure of The Atom Worksheet Set A
CBSE Class 9 Science Structure of The Atom Worksheet Set B
CBSE Class 9 Science Structure of The Atom Worksheet Set C
CBSE Class 9 Science Structure of The Atom Worksheet Set D
Chapter 05 The Fundamental Unit of Life
CBSE Class 9 Science Fundamental Unit of Life Worksheet Set A
CBSE Class 9 Science Fundamental Unit of Life Worksheet Set B
CBSE Class 9 Science Fundamental Unit of Life Worksheet Set C
CBSE Class 9 Science Fundamental Unit of Life Worksheet Set D
CBSE Class 9 Science Fundamental Unit of Life Worksheet Set E
CBSE Class 9 Science Fundamental Unit of Life Worksheet Set F
CBSE Class 9 Science Fundamental Unit of Life Worksheet Set G
Chapter 06 Tissues
CBSE Class 9 Science Plant Tissues Worksheet Set A
CBSE Class 9 Science Tissue Worksheet Set C
CBSE Class 9 Science Tissue Worksheet Set D
CBSE Class 9 Science Tissue Worksheet Set E
CBSE Class 9 Science Tissue Worksheet Set F
CBSE Class 9 Science Tissues Worksheet Set A
CBSE Class 9 Science Tissues Worksheet Set B
Chapter 07 Diversity In Living Organisms
CBSE Class 9 Science Diversity in Living Organism Worksheet Set A
CBSE Class 9 Science Diversity in Living Organism Worksheet Set B
CBSE Class 9 Science Diversity In Living Organisms Worksheet Set C
CBSE Class 9 Science Diversity In Living Organisms Worksheet Set D
CBSE Class 9 Science Diversity In Living Organisms Worksheet Set E
CBSE Class 9 Science Diversity In Living Organisms Worksheet Set F
Chapter 08 Motion
CBSE Class 9 Science Motion Worksheet Set A
CBSE Class 9 Science Motion Worksheet Set B
CBSE Class 9 Science Motion Worksheet Set C
CBSE Class 9 Science Motion Worksheet Set D
CBSE Class 9 Science Motion Worksheet Set E
CBSE Class 9 Science Motion Worksheet Set F
CBSE Class 9 Science Motion Worksheet Set G
CBSE Class 9 Science Motion Worksheet Set H
CBSE Class 9 Science Motion Worksheet Set I
CBSE Class 9 Science Motion Worksheet Set J
Chapter 09 Force and Laws of Motion
CBSE Class 9 Science Force and Laws of Motion Worksheet Set A
CBSE Class 9 Science Force and Laws of Motion Worksheet Set B
CBSE Class 9 Science Force and Laws of Motion Worksheet Set C
CBSE Class 9 Science Force and Laws of Motion Worksheet Set D
CBSE Class 9 Science Force and Laws of Motion Worksheet Set E
CBSE Class 9 Science Force and Laws of Motion Worksheet Set F
Chapter 10 Gravitation
CBSE Class 9 Science Gravitation Worksheet Set A
CBSE Class 9 Science Gravitation Worksheet Set B
CBSE Class 9 Science Gravitation Worksheet Set C
CBSE Class 9 Science Gravitation Worksheet Set D
Chapter 11 Work and Energy
CBSE Class 9 Science Work and Energy Worksheet Set A
CBSE Class 9 Science Work and Energy Worksheet Set B
Chapter 12 Sound
CBSE Class 9 Science Sound Worksheet Set A
CBSE Class 9 Science Sound Worksheet Set B
Chapter 13 Why Do We Fall Ill
CBSE Class 9 Science Why Do We Fall ill Worksheet Set A
CBSE Class 9 Science Why Do We Fall ill Worksheet Set B
Chapter 14 Natural Resources
CBSE Class 9 Science Natural Resource Worksheet Set C
CBSE Class 9 Science Natural Resource Worksheet Set D
CBSE Class 9 Science Natural Resource Worksheet Set E
CBSE Class 9 Science Natural Resource Worksheet Set F
CBSE Class 9 Science Natural Resources Worksheet Set A
CBSE Class 9 Science Natural Resources Worksheet Set B
Chapter 15 Improvement in Food Resources
CBSE Class 9 Science Improvent in Food Resources Worksheet Set A
CBSE Class 9 Science Improvent in Food Resources Worksheet Set B
z More Worksheets for Class 9 Science
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CBSE Class 9 Science Lab Worksheet Separation of Different Components
CBSE Class 9 Science Lab Worksheet True Solution Colloid Suspension
CBSE Class 9 Science Worksheet Set A
CBSE Class 9 Science Worksheet Set B
CBSE Class 9 Science Worksheet Set C
CBSE Class 9 Science Worksheet Set D
CBSE Class 9 Science Worksheet Set E
CBSE Class 9 Science Worksheet Set F
CBSE Class 9 Science Worksheet Set G
CBSE Class 9 Science Worksheet Set H
CBSE Class 9 Science Worksheet Set I
CBSE Class 9 Science Worksheet Set J
CBSE Class 9 Science Worksheet Set K
CBSE Class 9 Science Worksheet Set L
CBSE Class 9 Science Worksheet Set M Solved
CBSE Class 9 Science Worksheet Set N Solved
CBSE Class 9 Science Worksheet Set O Solved
CBSE Class 9 Science Worksheet Set P Solved
CBSE Class 9 Science Worksheet Set Q Solved
CBSE Class 9 Science Worksheet Set R Solved
CBSE Class 9 Science Worksheet Set S Solved
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Different Chemical Changes CBSE Class 9 Science Worksheet

The above practice worksheet for Different Chemical Changes has been designed as per the current syllabus for Class 9 Science released by CBSE. Students studying in Class 9 can easily download in Pdf format and practice the questions and answers given in the above practice worksheet for Class 9 Science on a daily basis. All the latest practice worksheets with solutions have been developed for Science by referring to the most important and regularly asked topics that the students should learn and practice to get better scores in their examinations. Studiestoday is the best portal for Printable Worksheets for Class 9 Science students to get all the latest study material free of cost. Teachers of studiestoday have referred to the NCERT book for Class 9 Science to develop the Science Class 9 worksheet. After solving the questions given in the practice sheet which have been developed as per the latest course books also refer to the NCERT solutions for Class 9 Science designed by our teachers. After solving these you should also refer to Class 9 Science MCQ Test for the same chapter. We have also provided a lot of other Worksheets for Class 9 Science which you can use to further make yourself better in Science.

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