CBSE Class 9 Science Lab Worksheet Different Chemical Changes

Access the latest CBSE Class 9 Science Lab Worksheet Different Chemical Changes. We have provided free printable Class 9 Science worksheets in PDF format, specifically designed for Different Chemical Changes. These practice sets are prepared by expert teachers following the 2025-26 syllabus and exam patterns issued by CBSE, NCERT, and KVS.

Different Chemical Changes Science Practice Worksheet for Class 9

Students should use these Class 9 Science chapter-wise worksheets for daily practice to improve their conceptual understanding. This detailed test papers include important questions and solutions for Different Chemical Changes, to help you prepare for school tests and final examination. Regular practice of these Class 9 Science questions will help improve your problem-solving speed and exam accuracy for the 2026 session.

Download 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?
 
 
 
 
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Different Chemical Changes CBSE Class 9 Science Worksheet

Students can use the Different Chemical Changes practice sheet provided above to prepare for their upcoming school tests. This solved questions and answers follow the latest CBSE syllabus for Class 9 Science. You can easily download the PDF format and solve these questions every day to improve your marks. Our expert teachers have made these from the most important topics that are always asked in your exams to help you get more marks in exams.

NCERT Based Questions and Solutions for Different Chemical Changes

Our expert team has used the official NCERT book for Class 9 Science to create this practice material for students. After solving the questions our teachers have also suggested to study the NCERT solutions  which will help you to understand the best way to solve problems in Science. You can get all this study material for free on studiestoday.com.

Extra Practice for Science

To get the best results in Class 9, students should try the Science MCQ Test for this chapter. We have also provided printable assignments for Class 9 Science on our website. Regular practice will help you feel more confident and get higher marks in CBSE examinations.

Where can I download the latest PDF for CBSE Class 9 Science Lab Worksheet Different Chemical Changes?

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Are these Science Class 9 worksheets based on the 2026 competency-based pattern?

Yes, our CBSE Class 9 Science Lab Worksheet Different Chemical Changes includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 9.

Do you provide solved answers for CBSE Class 9 Science Lab Worksheet Different Chemical Changes?

Yes, we have provided detailed solutions for CBSE Class 9 Science Lab Worksheet Different Chemical Changes to help Class 9 and follow the official CBSE marking scheme.

How does solving CBSE Class 9 Science Lab Worksheet Different Chemical Changes help in exam preparation?

Daily practice with these Science worksheets helps in identifying understanding gaps. It also improves question solving speed and ensures that Class 9 students get more marks in CBSE exams.

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