Case study based questions from is matter around us pure

CASE STUDY BASED QUESTIONS                                

Q.1 Read the passage and answer the questions given, one mark questions

Anything that occupies some space, having mass, volume and can be felt by one or more out of five senses is called matter. The purest form of matter is called an element. An element is a substance which cannot be split up into two or more simpler substances by the usual chemical methods of applying heat, light or electric energy.

A pure substance consists of a single type of particles. All the elements and compounds are pure substances because they contain only one kind of particles. eg. Hydrogen, Carbon, Oxygen, Carbon-monoxide, Copper, Gold, Silver. A pure substance has a fixed composition as well as a fixed boiling point and melting point. The presence of impurities generally increases the melting and boiling point of the pure substances

i)  Which of the statement is true about pure substances?

a.   Homogeneous mixtures are pure as they have same composition throughout.

b.   22 carat gold is pure in nature.

c.    Elements are not pure in nature.

d.    Gold is pure in nature.

Ans- d

ii) The boiling point of pure water is 100^oC. What likely be the effect on the boiling point of water if 150 gm NaCl is added to one litre water.

a.      Increases

b.     Decreases

c.      Remain same

d.     Does not effected

Ans- a

Q.2 Read the following and answers the questions.

A homogeneous mixture of two or more substances called a true solution. it consists of solute and solvent. The particle size of true solution in less than 1 nanometer. A suspension is a heterogeneous mixture in which the solute particle does not dissolve but remain suspended throughout the bulk of the medium. A colloid is a mixture that is actually heterogeneous but appears to be homogeneous as the particles are uniformly spread throughout the solution.

(i) which one of the following is most stable? 

A)True solution

B)Suspensions

C)Colloids

D) both A and B

Ans-A

ii) which type of mixture can be separated by filtration? 

A)True

B)Suspensions

C)Colloids

D)All of these

Ans-B

iii) which statement is incorrect about Tyndall effect. *

A)True solution show Tyndall effect

B)Suspensions show Tyndall effect

C)Colloid show Tyndall effect

D)Both B and C show Tyndall effect

Ans-A

iv) Which is the correct order of stability of solution *

A) True < Colloid<Suspension

B)Colloid<Suspension<True

C)Colloid<True<Suspension

D)Suspension<Colloid<True

Ans- D

ASSERTION AND REASONING BASED QUESTIONS

Q(3) Assertion :- an element is purest form of matter. 

       Reason --- an element is made up of same kind of atoms .

(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

(c) If the Assertion is correct but Reason is incorrect.

(d) If both the Assertion and Reason are incorrect.

Ans-a

Q(4)Assertion:- Milk and starch will show tyndall effect. Reason:- particle of milk and starch scatter the beam of light.

(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

(c) If the Assertion is correct but Reason is incorrect.

(d) If both the Assertion and Reason are incorrect.

Ans-a

     Competency based questions

Q(5)Tincture of iodine has antiseptic properties. This solution is made by dissolving *

(a) iodine in potassium iodide

b) iodine in oil

(c) iodine in water

(d) iodine in alcohol

Ans-d

Q(6) in which of the following is a mixture-

(a)Sea water

(b)Calcium carbonate

(c)Oxygen

(d)Iron

Ans-a

Q(7)identify the dispersed phase and dispersion medium of a given colloid. Colloid - Fog 

z

Ans-a

Q(8)which type colloidal solution is formed when a liquid present in liquid ?

   a. Gel

   b. Emulsion

   c. Aerosol

   d. Solid Sol

Ans-b

CRITICAL THINKING AND NUMERICAL BASED QUESTION

Q(9)0.5 gram of salt is dissolved in 25 gram of water. What is the percentage amount of salt in the solution (calculate by using mass by mass percentage formula) *

(a)1.96%

(b)3.00%

©4.00%

(d)2.5%

Ans-a

I. Read the following and answers and questions.(5)

A homogenous mixture of two or more substances called a true solution. It consists of solute and solvent. The particle size of true solution is less than 1 nanometer. A suspension is a heterogenous mixture in which the solute particle does not dissolve but remain suspended throughout the bulk of the medium. A colloid is a mixture that is actually heterogenous but appears to be homogeneous as the particle are uniformly spread throughout the solution.

i). Which one of the following is most stable?

a. True solution

b. Suspension

c. Colloids

d. Both a and b

ii). Which types of mixture can be separated by filtration

a. True solution

b. Suspension

c. Colloids

d. All of above

  iii) .Which types of effect  shown by solution B

 

(a)Lustre    (b) sonorous  (c)ductile  (d)Tyndall 

iv).when Shreyanshi  was suffering from fever the Doctor had asked his parents to check his temperature every two hours and also to keep a record. he was a thermometer that has a certain metal in liquid state inside it.generally metals are solid in nature which one of the following metal is found in liquid state at room temperature.

 (a) Na        (b) Al           (c) Hg              (d) Fe                                                                                     

v)Emulsion  solution is a colloidal solution in which the dispersed phase is a…… while the dispersion medium is a……                                                                                                                  (a)Liquid, liquid    (b)Liquid, solid  (c)Solid ,liquid     (d)Liquid ,gas                                                      Q.2 A solution contains 40g of sugar in 320g of water.Calculate the concentration in terms of mass by mass percentage of the solution.     

 

 

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CBSE Term wise Syllabus for Class 9 Examinations 2021-22

COURSE STRUCTURE CLASS IX(

Annual Examination)

 

Unit No.	Unit	Marks	Periods
I	Matter - Its Nature and Behaviour	23	50
II	Organization in the Living World	20	45
III	Motion, Force and Work	27	60
IV	Our Environment	06	15
V	Food; Food Production	04	10
	Total	80
	Internal assessment	20
	Grand Total	100

Theme: Materials          (50 Periods)

Unit I: Matter-Nature and Behaviour

Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state- melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.

Nature of matter: Elements, compounds and mixtures. Heterogeneous and homogenous mixtures, colloids and suspensions.

Particle nature and their basic units: Atoms and molecules, Law of constant proportions, Atomic and molecular masses. Mole concept: Relationship of mole to mass of the particles and numbers.

Structure of atoms: Electrons, protons and neutrons, valency, chemical formula of common compounds. Isotopes and Isobars.

Theme: The World of the Living       (45 Periods)

Unit II: Organization in the Living World Cell - Basic Unit of life :

Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles and cell inclusions; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes - basic structure, number.

Tissues, Organs, Organ System, Organism:

Structure and functions of animal and plant tissues (only four types of tissues in animals; Meristematic and Permanent tissues in plants).

Biological Diversity:

Diversity of plants and animals-basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms). Major groups of animals (salient features) (Non- chordates upto phyla and chordates upto classes).

Health and Diseases:

Health and its failure. Infectious and Non-infectious diseases, their causes and manifestation. Diseases caused by microbes (Virus, Bacteria and Protozoans) and their prevention; Principles of treatment and prevention. Pulse Polio programmes.

Theme: Moving Things, People and Ideas   (60 Periods) Unit III: 

Motion, Force and Work

Motion:

Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, derivation of equations of motion by graphical method; elementary idea of uniform circular motion.

Force and Newton’s laws :

Force and Motion, Newton’s Laws of Motion, Action and Reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration. Elementary idea of conservation of Momentum.

Gravitation:

Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall.

Floatation:

Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of Relative Density.

Work, energy and power:

Work done by a Force, Energy, power; Kinetic and Potential energy; Law of conservation of energy.

Sound:

Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the Human Ear (Auditory aspect only).

Theme: Natural Resources: Balance in nature   (15 Periods) 

Unit IV: Our Environment

Physical resources:

Air, Water, Soil. Air for respiration, for combustion, for moderating temperatures; movements of air and its role in bringing rains across India. Air, water and soil pollution (brief introduction). Holes in ozone layer and the probable damages.

Bio-geo chemical cycles in nature: Water, Oxygen, Carbon and Nitrogen.

Theme: Food     (10 Periods)

Unit V: Food Production

Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

PRACTICALS                      (30 Periods)

Practicals should be conducted alongside the concepts tough in theory classes

(LIST OF EXPERIMENTS)

1.    Preparation of:            Unit-I

a)    a true solution of common salt, sugar and alum

b)  a suspension of soil, chalk powder and fine sand in water

c)  a colloidal solution of starch in water and egg albumin/milk in water and distinguish between these on the basis of

·    transparency

·    filtration criterion

·    stability

2.  Preparation of       Unit-I

a)   A mixture

b)   A compound using iron filings and sulphur powder and distinguishing between these on the basis of:

 (i)      appearance, i.e., homogeneity and heterogeneity

(ii)     behaviour towards a magnet

(iii)   behaviour towards carbon disulphide as a solvent

(iv)   effect of heat

     3. Separation of the components of a mixture of sand, common salt and ammonium chloride (or camphor).      Unit-I

        4.     Perform the following reactions and classify them as physical or chemical changes:  Unit-I

         a)  Iron with copper sulphate solution in water

       b)  Burning of magnesium ribbon in air

        c)   Zinc with dilute sulphuric acid

           d)  Heating of copper sulphate crystals

           e) Sodium sulphate with barium chloride in the form of their solutions in water

 5.  Preparation of stained temporary mounts of (a) onion peel, (b) human cheek cells & to record observations and draw their labeled diagrams.   Unit-II

6. Identification of Parenchyma, collenchyma and Sclerenchyma tissues in plants, striped, smooth and cardiac muscle fibers and nerve cells in animals, from prepared slides. Draw their labeled diagrams.   Unit-II

7. Determination of the melting point of ice and the boiling point of water.  Unit-I

8.  Verification of the Laws of reflection of sound.  Unit-III

9.  Determination of the density of solid (denser than water) by using a spring balance and a measuring cylinder.  Unit-III

10. Establishing the relation between the loss in weight of a solid when fully immersed in

a)   Tap water    Unit-III

b)   Strongly salty water with the weight of water displaced by it by taking at least two different solids.

11.  Determination of the speed of a pulse propagated through a stretched string/slinky (helical spring).    Unit-III

12. Study of the characteristics of Spirogyra, Agaricus, Moss, Fern, Pinus (either with male or female cone) and an Angiospermic plant. Draw and give two identifying features of the groups they belong to. Unit-II

13.   Observe the given pictures/charts/models of earthworm, cockroach, bony fish and bird. For each organism, draw their picture and record:  Unit-II

       a)      one specific feature of its phylum.

       b)      one adaptive feature with reference to its habitat.

       14.  Verification of the law of conservation of mass in a chemical reaction. Unit-III

       15.   Study of the external features of root, stem, leaf and flower of monocot and dicot plants.    Unit-III