CBSE Class 9 Science Law Of Conservation Of Mass Worksheet

Read and download free pdf of CBSE Class 9 Science Law Of Conservation Of Mass Worksheet. Students and teachers of Class 9 Science can get free printable Worksheets for Class 9 Science in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 9 students should practice questions and answers given here for Science in Grade 9 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 9 Science Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Law Of Conservation Of Mass Class 9 Science Worksheet Pdf

Class 9 Science students should refer to the following printable worksheet in Pdf for Law Of Conservation Of Mass in standard 9. This test paper with questions and answers for Grade 9 Science will be very useful for exams and help you to score good marks

Class 9 Science Worksheet for Law Of Conservation Of Mass

CBSE Class 9 Science Worksheet - Law of Conservation of Mass. Students can download these worksheets and practice them. This will help them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

Experiment No: …6…… Date: ……………..

Objective: To prove the law of conservation of mass in a chemical reaction.

Requirements: Conical flask,test tubes,bariumchloride, sodiumsulphate,cork,spring balance

Theory :

 According to law of conservation of mass, mass can neither be created nor destroyed in a chemical

reaction.

 Total mass of reactants = Total mass of the products

Procedure:

 Prepare 5% solutions of barium chloride and sodium sulphate.

 Take 2ml of barium chloride solution in the conical flask and 2ml of sodium sulphate solution in the test

tube.

 Suspend the test tube with sodium sulphate in the flask with the thread and cork as shown in the figure

 Weigh the complete system.

 Now loosen the cork so that the solution in the test tube mixes with the solution in the conical flask.

 Again weigh the complete system.

 Find the difference between the initial and final masses of the system.

Observation:

 A white precipitate of barium sulphate is formed on mixing barium chloride and sodium sulphate which

shows the formation of the product.

 The mass of the reaction flask is found to remain unchanged ,ie,mass remains same before and after

the reaction.

Conclusions:

The above activity shows that in any chemical reaction, the total mass of the reactants is equal to the total mass

of the products i.e; mass can neither be created nor be destroyed in a chemical reaction which proves the law of

conservation of mass.

Precautions

1. The spring balance should be held vertical while in use.

2. Before making use of the spring balance it must be ensured that its pointer is at zero mark

3. The reading of the balance should be noted only when its pointer comes to rest.

4. Solutions should not get mixed before initial weighing

MULTIPLE CHOICE TYPE QUESTIONS

1. To identify the law of conservation of mass, a student added 10 mL of 5% barium chloride solution

into 10 mL of 5% sodium sulphate solution. Which one of the following is the correct observation?

a) A clear solution is obtained

b) The solution turns to red colour

c) A yellow precipitate is formed

d) A white precipitate is formed

2. While veryfying the law of conservation of mass Smith added 3.5 g of magnesium metal into 13.7 g of

hydrochloric acid. If the mass of magnesium chloride formed is 13.8 g , what is the mass of eliminated

hydrogen gas if the law of conservation of mass of mass is correct.

a) 3.2 g b) 3.4 g c) 4.3 g d) 5 g

3. In a chemical reaction one molecule of nitrogen reacts with three molecules of hydrogen to form

ammonia. If the law of conservation of mass is correct what will be the number of atoms of nitrogen

and hydrogen at the end of the reaction?

a) N = 2 , H = 6

b) N = 1 , H = 3

c) N = 6 , H = 2

d) N = 3 , H = 3

4. While verifying the law of conservation of mass, a student added 5 g of sodium bicarbonate to a test

tube containing 14.5 g of acetic acid. The total mass of the reactant is 19.5 g but the mass of the

product after the reaction is only 16.2 g. The reduction in the mass of the product is due to

a) Elimination of CO2 gas

b) Elimination of O2 gas

c) Liberation of heat

d) Elimination of CO gas

5. Which one of the following reactions is not suitable in the laboratory to verify the law of conservation

of mass?

a) Mixing HCl and NaOH solution

b) Thermal decomposition of ferrous sulphate

c) Mixing copper sulphate and barium chloride solutions

d) Mixing lead nitrate and potassium iodide solutions

6. Lime stone(CaCO3) upon strong heating undergoes thermal decomposition to form lime(CaO) and

CO2 gas. The mass of CaO and mass of CO2 formed by the decomposition of

25 g of CaCO3 are (RAM of Ca = 40, C = 12 , O = 16)

a) CaO= 28 , CO2 = 22

b) CaO= 14 , CO2 = 11

c) CaO= 22 , CO2 = 28

d) CaO= 11 , CO2 = 14

7. To verify the law of conservation of mass, which one of the following combinations can a student

select to prove the law.

a) Copper sulphate and sodium sulphate

b) Sodium sulphate and sodium chloride

c) Copper sulphate and sodium carbonate

d) Sodium sulphate and sodium carbonate

8. For the verification of law of conservation of mass in a chemical reaction four students, A , B, C and D

performed the following reactions:

A - Added calcium oxide to water

B - Heated ferrous sulphate crystals in a test tube.

C - Dipped iron nails in copper sulphate solution.

D - Added silver nitrate to calcium chloride.

The student who is likely to get the best result is,

a) A b) B c) C d) D

2 of 2

 

Please click the link below to download CBSE Class 9 Science Worksheet - Law of Conservation of Mass.

Tags: 

 


Click to View or Download pdf file
Click for more Science Study Material
Chapter 1 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
Chapter 2 Is Matter Around Us Pure
CBSE Class 9 Science Is Matter Around Us Pure Worksheet
CBSE Class 9 Science Matter Around Us Worksheet
Chapter 3 Atoms and Molecules
CBSE Class 9 Science Atoms And Molecules Worksheet Set A
CBSE Class 9 Science Atoms And Molecules Worksheet Set B
Chapter 4 Structure of the Atom
CBSE Class 9 Science Structure Of Atom Worksheet
Chapter 5 The Fundamental Unit of Life
CBSE Class 9 Science Fundamental Unit Of Life Worksheet
Chapter 6 Tissues
CBSE Class 9 Science Tissues Animals Worksheet
CBSE Class 9 Science Tissues Plants Worksheet
Chapter 7 Diversity In Living Organisms
CBSE Class 9 Science Diversity In Living Organisms Animals Worksheet
CBSE Class 9 Science Diversity In Living Organisms Plants Worksheet
CBSE Class 9 Science Diversity In Living Organisms Worksheet
Chapter 8 Motion
CBSE Class 9 Science Motion Worksheet Set A
CBSE Class 9 Science Motion Worksheet Set B
Chapter 9 Force and Laws of Motion
CBSE Class 9 Science Force And Laws Of Motion Worksheet
Chapter 10 Gravitation
CBSE Class 9 Science Gravitation Worksheet
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
Chapter 13 Why Do We Fall Ill
CBSE Class 9 Biology Why Do We Fall Ill Worksheet
CBSE Class 9 Science Why Do We Fall Ill Worksheet
Chapter 15 Improvement in Food Resources
CBSE Class 9 Science Improvement In Food Resources Worksheet Set A
CBSE Class 9 Science Improvement In Food Resources Worksheet Set B
More Worksheets for Class 9 Science
CBSE Class 9 Science All Chapters Worksheet
CBSE Class 9 Science Experiments Worksheet
CBSE Class 9 Science Law Of Conservation Of Mass Worksheet
CBSE Class 9 Science Melting And Boiling Point Worksheet
CBSE Class 9 Science Physical And Chemical Changes Worksheet
CBSE Class 9 Science Preparation Of Mixture And Compound Worksheet
CBSE Class 9 Science Property Of True Solutions Worksheet
CBSE Class 9 Science Revision Worksheet Set A
CBSE Class 9 Science Revision Worksheet Set B
CBSE Class 9 Science Revision Worksheet Set C
CBSE Class 9 Science Revision Worksheet Set D
CBSE Class 9 Science Revision Worksheet Set E
CBSE Class 9 Science Revision Worksheet Set F
CBSE Class 9 Science Revision Worksheet Set G
CBSE Class 9 Science Revision Worksheet Set H
CBSE Class 9 Science Revision Worksheet Set I
CBSE Class 9 Science Revision Worksheet Set J
CBSE Class 9 Science Separation Of Components Of Mixture Worksheet

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Online courses for classes XI and XII offered by NCERT

Ministry of Education (MoE), Government of India has launched a platform for offering Massive Open Online Courses (MOOCs) that is popularly known as SWAYAM (Study Webs of Active learning for Young Aspiring Minds) on 9 th July, 2017. NCERT now offers online courses for...

CBSE notification 40/2021 Innovation Ambassador Program

This is with reference to CBSE Notification No. 40/2021 dated 04.05.2021 regarding the Innovation Ambassador program – An online training program for teachers by CBSE in collaboration with Ministry of Education’s Innovation Cell (MIC) and AICTE. In view of the current...

CBSE Term 2 Board Examinations

CBSE vide Circular No.Acad-51/2021 dated 5th July, 2021, notified that in the session 2021-2022, Board Examinations would be conducted in two terms, i.e.. Term I and Term II. This decision was taken due to the uncertainty arising out of COVID 19 Pandemic. Term I...

Surya Namaskar Project on 75th Anniversary of Independence Day

Ministry of Education, Govt of India vide letter No. F.No. 12-5/2020-IS-4 dated 16.12.2021 has intimated that under the banner Azadi ka Amrit Mahotsav the National Yogasanasports Federation has decided to run a project of 750 million Surya Namaskar from 01 January 2022...

National Youth Day and Birth Anniversary of Swami Vivekananda

Ministry of Education, Govt. of India vide D.O No. 12-4/2021-IS.4 dated 04.01.2022 intimated that 12 January 2022 will be celebrated as “National Youth Day” and “Birth Anniversary of Swami Vivekananda”.   All Schools affiliated to CBSE may celebrate 12 January 2022 as...

Pariksha Pe Charcha 2022

The 5th edition of Pariskhas Pe Charcha the unique interactive program of Hon’ble Prime Minister with students teaches and parents will be held through virtual mode in February, 2022. In order to select participants who will be featured in Pariksha Pe Charcha programme...