Chem Teacher

Teacher's Manual

CCE Worksheets

SCIENCEFORMATIVE ASSESSMENT

Class IX • Term 1 •

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Class IX/ Term 1/ Formative Assessment Matter in Our Surroundings

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Teacher's Manual CCE Worksheets SCIENCE Class IX/ Term 1/ Formative Assessment

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* CLASS WORK Content Coverage : Interconversion of the three states of matter

To enable the student to –• appreciate that the three states of matter are interconvertible.• understand that with the change in temperature and pressure, the state of the matter may

change.

Learning Objectives

PROCEDURE : Following information may be given to the students.1. Three states of matter are interconvertible.2. Effect of temperature on all the three states of matter.3. A detailed knowledge of melting, boiling, condensation, solidification and sublimation processes.4. When heat is provided to the liquid, the kinetic energy may increase to such an extent that the liquid may change to vapours.5. A few solids, on heating, are directly converted to vapours and on cooling, vapour is converted back to solid.

ASSESSMENT CRITERIA :1 mark for every example and 1/2 mark for each correct process and 1/2 mark for each correct change of state.

STUDENT WORKSHEET

Time : 20 minutes Marks : 10

DIRECTIONS : Study the figure given below for interconversion of the three states of matter and fill up the following table.

[C] [B]

[A]

[D]

[E]

Solid

Liquid

Gas


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SOLUTIONS

S. No. Name of process Identify the change of state Give one real life example

A Melting Solid to liquid An ice cube melts once taken out of refrigerator

B Condensation Gas to liquid Water droplets at the cover of a cooking pan

C Sublimation Solid to gas and vice-versaCamphor sublime at room temperature (solid to gas)

Formation of frost on windows of automobiles under cold conditions (gas to solid)

D Solidification Liquid to solid Water freezes to ice in refrigerator

E Boiling Liquid to vapourYou can see water vapour forming when your

mother is making tea

S. No. Name of process Identify the Change of state Give one real life example

A

B

C

D

E


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* HOME WORK Content Coverage : Change of State

To enable the students to• understand the states of matter and their properties.• understand the change of state (liquid solid) and this process (solidification).• enhance observation skills.

→

Learning Objectives

MATERIAL REQUIRED :Two cans with lids : One small and one large.Ice, salt, milk, sugar, cream and some flavouring agent like vanilla extract.

PROCEDURE :– Mix the milk, sugar, cream and vanilla extract properly and pour it into the small can.– Close the small can with the help of the lid.– First put ice and salt in large can and fix the small can in the middle of large can.– Now close the large can with the lid.– Shake the large can gently after every 15 minutes. Repeat this exercise till 2 hours.– Open the large can and take out the small can, open its lid and take out your ice-cream.

ASSESSMENT CRITERIA :3 marks (1/2 mark for each entry) for the quantity observation table.3 marks for the time table.9 marks for the questions.

STUDENT WORKSHEET

Time : 2 days Marks : 15

DIRECTIONS : Complete the project following the procedure given below. Record your observations in the table provided belowand then answer the questions that follows.OBSERVATION TABLE :

SubstanceQuantity (in gms or ml) used in

the processTime Observations after the given time

(i) Milk ___________________

(ii) Cream ___________________

(iii) Vanilla ___________________

(iv) Sugar ___________________

(v) Salt ___________________

(vi) Ice ___________________

(i)

(ii)

(iii)

First 30 minutes

After 1 hour

Last 30 minutes

Write down the following conclusions :1. What are the processes involved in making ice-cream? (1 mark)2. Why do we add salt to ice? (2 marks)3. How do the temperature and heat affects the manufacturing process of ice-cream? (2 marks)4. Why do we need to shake the large Can gently? (2 marks)5. Can you suggest some methods with which you can expediate the above activity? (2 marks)


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* LAB WORK Content Coverage : Effect of substances on the boiling point of water

To enable the students to• analyse the effect of various substances dissolved in water on boiling point of water.• compare the effect of soluble substances or impurities on boiling point of water.• draw conclusion(s) on the basis of your observation.

Learning Objectives

PROCEDURE :You may form groups of 4 to 6 students in the class and give following instructions for performing the activity.1. Take 6 test tubes — 1 for distilled water and remaining 5 for samples.2. Set the apparatus for determining the boiling point of water.3. First note down the boiling point of distilled water.4. Now add 1 gm of sugar in 10 ml of water and dissolve it completely.5. Note the boiling point of sugar solution.6. Repeat the same experiment with 1 gm of common salt, CuSO4, ZnNO3 & NH4Cl in 10 ml of water and note their boiling points.

ASSESSMENT CRITERIA :Correct Procedure (2 marks)Correct Recordings (6 × 1 mark)Conclusion & Result (2 marks)

STUDENT WORKSHEET


DIRECTIONS : Carry out the activity as per the above procedure in your particular group. Write the conclusion in your worksheetafter carrying out the activity.

OBSERVATIONS :

S. No. Substance added Amount of substance Amount of water Boiling point

1 — — 10 ml ____________

2 Sugar 1 gm 10 ml ____________

3 Salt 1 gm 10 ml ____________

4 ZnNO3 1 gm 10 ml ____________

5 CuSO4 1 gm 10 ml ____________

6 NH4Cl 1 gm 10 ml ____________

CONCLUSION :

_______________________________________________________________________________________________________

_______________________________________________________________________________________________________

_______________________________________________________________________________________________________


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* HOME WORK Content Coverage : Rate of Sublimation of different substances

TITLE : To study the rate of sublimation of your common house use substances like odonil, camphor, naphthalene.

To enable the students to• Learn that solid change in to gas without change into liquid state (or vice versa) is called

sublimation.• Understand the rate of sublimation of any substance depends on time, amount, heat, air.• Enhance observation skills.

Learning Objectives

PROCEDURE :1. Students should collect the samples from the market with the help of their parents.2. Take 5 gms of each of these substances and weigh them.3. Measure the rate of sublimation.4. Measure the time when the amount becomes 3/4 (approximately) of its initial amount.5. Measure the time when the amount becomes 1/2 (approximately) of its initial amount.6. Measure the time when the amount becomes 1/4 (approximately) of its initial amount.7. Measure the time when the substance completely disappears.8. Record the observations in the following table.

ASSESSMENT CRITERIA :6 marks for completing the table correctly – ½ marks for each correct recording.4 marks for questions (as given in brackets).

STUDENT WORKSHEET

Time : 1 week Marks : 10

DIRECTIONS : Complete the project following the procedure given below. Record your observations in the table provided belowand then answer the questions that follows.

REQUIREMENTS :Samples of naphthalene, odonil, camphor, in equal amounts (5 gm), watch.

RECORD OBSERVATION IN THE FOLLOWING TABLE :

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Time consumed Time consumed Time consumed Complete timeSl. Initial amount Substances for 3/4th of for 1/2th of for1/4th of consumed for of substanceNo initial amount initial amount initial amount disappearance of substance

.

2.

3.

GIVE THE ANSWER CORRECTLY :1. What is the order of the rate of sublimation of the three substances? (1 mark)2. Give reasons for the difference in the rate of sublimation of the three substances. (1 mark)3. What conclusion(s)/ learning(s) can you make from the above activity? (2 marks)


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* CLASS WORK Content Coverage : Whole Chapter

• To learn that all different states of matter and their properties.• To learn about interconversion of matter from one state to another state.

Learning Objectives

ASSESSMENT CRITERIA : 1 mark for every correct answer

STUDENT WORKSHEET


DIRECTIONS : Given below is a crossword puzzle. Fill in the blank square boxes to form a complete word / term by using the givenclues. You have to fill an alphabet in every small square.

1

7 2

3

4

5

6

8 9

10

Across Down1. A measure of the amount of matter in an object (4) 7. Liquid non-metal (7)2. Highly energetic, ionised form of matter (5) 8. Most ordered state of matter (5)3. Solid carbon dioxide is also known as (6) 9. Matter has mass and occupies (5)4. CO2, NH3, H2 and NO2 have 10. Odonil and camphor disappears due to (11)5. Gas used in vehicles now-a-days (3)6. Fifth state of matter (22)

SUGGESTIVE REMEDIATION :• Students are likely to enjoy this activity provided they are given proper guidelines and sufficient practice.• The beginner may find it difficult to perform the activity. They may be helped separately to completely the puzzle.


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SOLUTIONS

M

B

D

L

C

B

A

P

R

O

N

M

I

S

L

Y

W

G

S

C

E

O

S

A

I

D

M

E

N

T

ZS

O

N

T Y

A

M

I

L

B

U

S

P

1

7 2

3

4

5

6

8 9

10

O S E E N S T E I C O N D E N S A T E


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PROCEDURE : The teacher will divide the class in groups of 4 to 6 students and will appoint one student as the Group Leader. Theteacher will instruct the Leader to help the other students in case they face any difficulty.

STUDENT WORKSHEET

Time : 30 min. Marks : 30

DIRECTIONS : You have to attempt all the 5 questions given below on your own. In case of any difficulty you can consult yourGroup Leader and complete the sheet.

1 Complete the following chart :STATES OF MATTER

Liquid

ExampleSalt, Sand

Copper coin

NH , H ,O3 2

2

(5 marks)

2 Compare Solid, Liquid and Gas on the basis of properties listed in table.

Property Solid Liquid Gas

Shape

Volume

Density

Can be compressed

Force between particles

Motion of particles

(6 marks)


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3 Give below are four figures which illustrate some process. Identify the process and write below each of thefigure in the space provided.

(a)

Ironstand Thermometer

Glass stirrer

Beaker

Ice

Burner

(b)

Ironstand

Thermometer

Glass stirrer

Beaker

Water

BurnerBurner

China dish

Ammoniumchloridesolidified

Inverted funnel

Cotton plug

Ammoniumchloridevapours

(c)

(3 marks)

4 Fill in the Blanks1. The forces of attraction between the particles are _______ in solids, _______ in liquids and _______ in gases.2. Rapid evaporation depends on the _______ area exposed to atmosphere.3. A liquid wets the given surface if, _______ forces are predominant over _______ forces.4. Solid carbon dioxide (dry ice) is stored under _______.5. The rate of evaporation of a liquid increases with _______ in wind speed. (5 marks)

5 Explain the following in your own words

1. What is rubber foam. You are able to compress it, why? (2 marks)2. What are LPG and CNG? Elaborate the two with their specific roles in our daily life. (3 marks)3. The boiling points of diethyl ether, acetone and n-butyl alcohol are 56°C, 118°C and 35°C respectively. Write down their boiling

points in kelvin scale. (3 marks)4. Define the following terms in one sentence each.

(a) Condensation (b) Diffusion (c) Evaporation (3 marks)

SOLUTIONS1

Liquid

ExampleSalt, Sand

Copper coin

NH , H ,O3 2

2

Solid Gas Plasma

Examples water milk

States of Matter


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2 Property Solid Liquid Gas

Shape Definite shape No definite shape No definite shape

Volume Definite volume Definite volume No definite volume

DensityMaximum (Intermolecular

space is minimum)

Intermediate (Intermolecular space is more is comparison

to solids)

Minimum (Intermolecular space are maximum)

Can be compressedCan not be compressed

(little free space between particles)

Low compress ibility (comparatively more free space between particles)

Very high compress ibility (lots of free space between

particles )

Force between particles Strongest Intermediate W eakest

Motion of particles Vibrate about a fixed pointParticles can roll, s lide past

each otherParticles are in random motion

at high speed

3 (a) Melting (ice to water); (b) Evaporation (water to water vapour); (c) Sublimation (ammonium chloride)

4 1. maximum, intermediate, minimum; 2. surface 3. adhesive forces, cohesive forces. 4. high pressure 5. increase

5 1. Rubber foam is a solid which has minute holes, in which air is trapped, when we press it, the air is expelled out and we areable to compress it.

2. These are gases used as fuel. LPG - Liquified Petroleum Gas, which is used to fill cooking gas cylinder.

CNG - Compressed Natural Gas, used as fuel in vehicles.

3. 96°C = (56 + 273) = 329°K for diethyl ether

118°C = (118 + 273) = 391°K for acetone

35°C = (35 + 273) = 308°K for n-butyl alcohol.

4. (a) Condensation : The process of formation of liquid from gas.

(b) Diffusion : The gas particles move in all direction.

(c) Evaporation : When liquid changes in to gaseous state.


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Learning Objectives To enable the student to –• learn that matter exists in three different states.• understand basic properties of three states of matter.• explain different processes and phenomenon on the basis of properties of different states.

PROCEDURE :You may1. Explain that matter exists in three different states.2. Explain that matter can be converted from one state to another state.3. Give detailed explanation for different processes on the basis of properties of different states.

ASSESSMENT CRITERIA :1 mark for each correct Multiple Choice Question.2 marks for Q. 11 and 3 marks for Q. 12

STUDENT WORKSHEETTime : 20 minutes Marks : 15

DIRECTIONS : Choose the best correct option in the following questions :

1 Multiple Choice Questions6. Select the one that when used would be considered as

the best condition for liquification of a gas.(a) Increasing the temperature.(b) Decreasing the pressure.(c) Increasing the pressure and decreasing the

temperature.(d) Decreasing the pressure and increasing the

temperature.7. Select the one which is not matter.

(a) warmness (b) smoke(c) humidity (d) water

8. When a gas is compressed keeping temperature constant,it results in(a) increase in speed of gaseous molecules(b) increase in collision among gaseous molecules(c) decrease in speed of gaseous molecules(d) decrease in collision among gaseous molecules.

9. The process of change of liquid state into gaseous stateat constant temperature is known as(a) boiling (b) melting(c) fusion (d) evaporation

10. The one, in which interparticle forces are strongest, is(a) sodium chloride (b) hydrogen(c) ether (d) carbon dioxide

1. The high diffusibility of gases is due to(a) high intermolecular forces of attraction(b) high KE of molecules(c) restricted translatory motion in upward direction(d) All the above

2. Water kept in an earthen pitcher, during summer daysbecomes very cold due to(a) condensation (b) evaporation(c) freezing (d) fusion

3. Maximum intermolecular forces of attraction exists in(a) bromine (b) air(c) oxygen (d) copper

4. Select the correct order of evaporation for water, alcohol,petrol and kerosene oil :(a) water > alcohol > kerosene oil > petrol(b) alcohol > petrol > water > kerosene oil(c) petrol > alcohol > water > kerosene oil(d) petrol > alcohol > kerosene oil > water.

5. Rate of diffusion depends upon(a) Temperature(b) Surface area(c) Both temperature and surface area(d) None of these


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2 Match the Column

11. Column-I Column-II

A. Odonil (i) Cooling

B. No. of states of matter (ii) Sublime

C. Evaporation causes (iii) Five

D. Least ordered state (iv) Brownian motion

E. Movement of particle (v) Gas

(vi) four

(vii) liquid

(viii) any motion

A – B – C – D – E –

12. Column-I Column-II Column-III

A. Matter (i) Ionised form (a) Plasma

B. Super excited particle (ii) Mass (b) Sublimation

C. Mixture of sand and iodine (iii) Separated (c) Space

D. Definite shape (iv) Solid (d) Low density

E. Gas (v) Great compound (e) Silver

A – B – C – D – E –

SOLUTIONS1 Multiple Choice Questions

1. (b) Gas particles move freely in all possible direction and possess high K.E.2. (b) Evaporation causes cooling.3. (d) Copper is a solid metal and has maximum inter-molcular force of attraction.4. (d) Rate of evaporation of petrol is higher then alcohol, kerosene oil and water.5. (c) At high temperature and more surface area, the gaseous molecules diffuse very fast.6. (c) Any gas can be changed into liquid by increasing the pressure and decreasing the temperature.7. (a) Smoke, water and humidity all are different states of matter, while warmness is a feeling/ sensation.8. (d) Compression decreases the collision among gas molecules.9. (a) Liquid changes into gaseous state by vaporization or evaporation.10. (a) Hydrogen, carbon dioxide are gaseous molecules and ether is a liquid while sodium chloride is a solid so inter-molecular

forces are strongest in sodium chloride.

2 Match the Column :

11. A – (ii) B – (iii) C – (iv) D – (v) E – (iv)

12. A – (ii, c) B – (i, a) C – (iii, b) D – (iv, e) E – (v, d)


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* HOME WORK Content Coverage : Whole Chapter

To enable the student to –• learn that matter exists in three different states.• understand basic properties of three states of matter.• explain different processes and phenomenon on the basis of properties of different states.

Learning Objectives

ASSESSMENT CRITERIA :Marks are given in bracket.

STUDENT WORKSHEET

Marks : 25

DIRECTIONS : Given below are 3 category of questions. Answer each of these questions on separate sheets of paper.

1 Very Short Answer Questions1. What is atmospheric pressure? (1 × 10) = 10 marks2. Can you name a state of matter which has no free surface?3. Suggest the two parameters which determine the physical state of matter.4. At 0°C, when ice on heating changes into water, temperature remains constant. What is this change called?5. When a spoon of salt is poured into water, it disappears soon. What conclusions you can draw from this observation about the

structure of salt?6. What is the effect of addition of impurities on the freezing point and boiling point of a substance ?7. What are cohesive forces and adhesive forces?8. Give reasons why do wet clothes dry faster on a windy day?9. Why do our palms feel cold when we put some acetone or petrol or perfume on it ?10. Write the correct order of the Kinetic Energy of the molecules of solid, liquid and gas.

2 Short Answer Questions11. When two ice cubes are pressed, they join together. Can you explain the principle involved? (2 × 5) = 10 marks12. Why are cotton clothes preferable in summer?13. Why do the gases exert more pressure on the walls of the container than the solids ?14. If you hammer an iron nail, a chalk piece and water in a tub, what will you observe?15. What property of the gas is utilized when natural gas is supplied for vehicles?

3 Long Answer Questions16. Which phenomenon occurs during the following changes? (5 × 2 = 10 marks)

(i) Size of naphthalene balls decrease (ii) Wax melts in the sun(iii) Drying of wet clothes (iv) Formation of clouds(v) After rain, humidity gets absorbed.

17. How does the rate of diffusion changes with(i) density of liquid and (ii) temperature?Illustrate it with 2 examples.


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SOLUTIONS1 Very Short Answer Questions

1. The pressure of air in atmosphere is called atmospheric pressure.2. Gas3. Shape and volume4. Fusion or melting5. Matter which has mass occupies space. Salt dissolves in water due to presence of spaces between the particles of water and salt.6. Decrease in freezing point and increase in boiling point.7. The forces acting between the molecules of the same matter are called cohesive forces whereas the forces acting between the

molecules of two different matters is called adhesive forces.8. Wet clothes dry faster on a windy day because of faster rate of evaporation.9. The particles gain energy from your palm or surrounding and evaporate causing the palm to feel cold.10. The intermolecular spaces are higher in gas. So the correct order of the K.E. of the molecules in

gas > liquid > solid.

2 Short Answer Questions11. Decrease in melting point of ice with increase in pressure.12. (i) Cotton, being a good absorber of water absorbs sweat from the body.

(ii) Evaporation of sweat in the exposure to the atmosphere.(iii) Loss of energy and cooling of surroundings.

13. In gases, the particles move randomly at high speed and they collide with each other and with walls of the container. Due to thiscollision with walls of the container, the gases exert more pressure than solids.

14. Iron nail changes its shape, a chalk piece is broken into smaller particles and the volume and shape of water does not change.These all show physical states of matter and their properties.

15. At high pressure gas is compressed. So gas supplied for vehicles is compressed natural gas which is very light and has lowdensity.

3 Long Answer Questions16. (i) Sublimation

(ii) Fusion(iii) Evaporation(iv) Condensation(v) Vaporization

17. (i) Take two beakers. Fill the first with water and second with honey (which is denser than water). If we put a drop of red inkslowly and carefully along the sides of the first and the second beaker and leave both of them for two hours undisturbed. Wefind after two hours that the drop of red ink has diffused more evenly throughout the water then in the beaker filled withhoney. This happens because of higher rate of diffusion in the less denser liquid.

(ii) Drop a crystal of copper sulphate into a glass of hot water and a glass of cold water and stir the solutions. Allow the crystalsto settle at the bottom. You will observe after sometime that the crystal mixes more quickly in the glass of hot water due tothe fact that as the temperature rises, the kinetic energy increase the rate of intermixing of the particles.

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