Chemistry IX Chapter - Matter in our surrounding ASSIGNMENT -1, (2012-13)


Sadhana Devi Vidyapith, Samastipur  ASSIGNMENT -1, (2012-13) 
Sub. – Chemistry, Class   IX  Chapter: Matter in our surrounding
NOTE  : Q 1 to 15 carries 2 marks each & Q 16 to 25 carries 3 marks each
Q.1 Some substances cannot exist in the gaseous state, other cannot exist in the liquid state, and some cannot exist either in the gaseous or the liquid state. Giving suitable examples. Justify the above statement?
Q.2 A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was filled with pungent irritating smell. The students immediately opened the windows and doors and switched on the exhaust fans. After sometime, student got relief. Explain what did actually happen?
Q.3 Carbon dioxide which is a gas under normal conditions of temperature and pressure can be liquefied by compressing it to 70 atm at ordinary temperature. What happens when pressure is suddenly released?
Q.4 What is the difference between a gas and a vapour?
Q.5 Ordinary water boils at 100 degree Celsius. Can it be made to boil at 95 degree Celsius or 105 degree Celsius?
Q.6 Which state of matter is characterized by the following properties:
a) A substances with a fixed arrangement of particles.
b) A substances that has large distances between the particles.
Q.7 “On blowing air into a balloon, It inflates.” Explain Why
Q.8 why do we call sponge a solid even it is easily compressible?
Q.9 Arrange the particles of the three states of matter:-
a) In order of increasing randomness. b) Decreasing order of inter particle distances.
Q.10 Even 2-3 cups of potassium permanganate can impart colour to a large volume of water which characteristic property of particles of matter is illustrated by this observation?
Q.11 What are the two factors responsible for interconversion of matter?
Q.12 How boiling is different from evaporation. Give two points.
Q.13 What is diffusion? What are the factors on which rate of diffusion depends.
Q.14 When a liquid boils, its temperature remains the same, so where does the heat go?
Q.15 Give Reason.
a. Camphor disappears with time without leaving any solid.
b. On a hot sunny day, people sprinkle water on the ground.
Q.16 (a) Name the state of matter in which
i. Layers of particles can slip and slide over each other
ii. Particles just more around randomly, because of very weak force of attraction.
(b) List two ways by which a gas can be converted into a liquid.
Q.17 Explain any three factors which affect the rate of evaporation.
Q.18 Give reason:-
a. Rubber band is a solid but it can change its shape on stretching.
b. Sponge is a solid yet we are able to compress it.
c. Clothes dry faster on a windy day.
Q.19 After rains, wet roads dry quickly. Why?
Q.20 How dos perspiration or sweating help in keeping our body cool on a hot day ?
Q.21 Define the terms –
a) Latent heat of Fusion b) Latent heat of vaporization c) Melting point. and Boiling Point
Q.22 Why clothes dry faster when we spread them out.
Q.23 Equal amount of water & alcohol are separately placed in two identical petri dish . Which will evaporate faster – water or alcohol . Why ?
Q-24 Differentiate between solids, liquids and gases on the bases of:
a) Density                                 b) compressibility                          c) Kinetic Energy          d) Shape & volume                  e) intermolecular forces                  f) Fluidity
Q25 In a hot summer day. Priyanka & Asha are wearing cotton & nylon clothes respectively. Who would be more comfortable & why?
For more assignment Visit : jsuniltutorial and Chemistry Adda

Comments

  1. EbrahimJuly 9, 2014 at 4:04 PM

    Q6. a} solid state
    b}gaseous state

    ReplyDelete
  2. EbrahimJuly 9, 2014 at 4:09 PM

    Q8. we call a sponge, solid object because it maintaines a shape of it own.

    ReplyDelete
  3. EbrahimJuly 9, 2014 at 4:17 PM

    Q12.
    Evaporation
    1.It is a surface phenomenon.
    2.it takes place at any temperature below its
    boiling point.
    3.it is a quite process.
    BOILING
    1.it is a bulk phenomenon.
    2.it takes place at the boiling point only.
    3.it is a vigorous process.

    ReplyDelete
  4. Nik29June 17, 2017 at 11:48 PM

    Plz solve question 3

    ReplyDelete

Post a Comment

Popular Post

Obtaining and Utilization Food Class 7 Science Solved question (Basic Science Questions answers)

Image
A. Answer these questions 1. Name the three life process help living being to procure energy from food? Answer: Three life processes that help living organisms to procure energy from food are: (i) Digestion (Nutrition) (ii) Respiration (iii) Transportation 2. What are Autotrophs? Name an organism other than other than green plant that is an autotroph. Answer: Autotrophs are organisms that can prepare their own food. Chlamydomonas is a type of green algae which is an example of an autotroph, other than green plants. Cyanobacteria are also an example of autotroph. 3. Name three type of heterotrophic nutrition Answer: Three types of heterotrophic nutrition are: (i) Saprophytic nutrition (ii) Parasitic nutrition (iii) Holozoic nutrition 4. What are enzymes? Answer: Enzymes are chemical substances that act as biological catalysts and are important for carrying out biochemical processes, such as digestion, in our body ...
Read more

9th Atoms and Molecules Question bank By KV For CBSE Board

CHAPTER - 3 “Atoms and Molecules” 1. Laws of Chemical Combination 2. John Dalton's Atomic Theory 3. Atoms, ions & Chemical Formula 4. Mole Concept 5. Molar Mass & Avogadro constant Download Test Paper with solution CBSE Study By Jsunil ********************************************************************************* 1 Mark Questions: 1. Who gave law of conservation of mass ? 2. What term is used to represent the mass of 1 mole molecules of a substance? 3. What name is given to the number 6.023 x 10 23 ? 4. What is molecular mass? 5. Give Latin names for sodium & mercury. 6. *How many atoms are there in exactly 12 g of carbon ? 7. Define mole. 8. Calculate formula unit mass of CaCl2. [ At. Mass : Ca = 40 u , Cl = 35.5 u ] 9. Name a diatomic gas. 10. How many atoms are present in H 2 SO 4 . ...
Read more

Class IX assignment Chapter: Sound

9 th Chapter: sound –Guess Questions for practice 1. If you place some small blades on a drum, what will you observe when you beat this drum with a drum stick? Explain. 2. Describe an activity with a (a) metre scale (b) rubber band to show that only a vibrating body produces sound. 3. With the help of tuning fork demonstrate that sound is produced by a vibrating body. 4. What is vibrating in the following musical instruments producing by a musical sound? (a) Violin (b) drum (c) saxophone (d) flute (e) guitar (f) dholak (g) tabla (h) sitar 5. What is medium? What constitutes the medium? 6. Describe an activity to show sound travels faster through a solid medium than through a gaseous medium. 7. Describe an activity to show sound travels faster through a solid medium than through a liquid medium. 8. Describe the experiment to demonstrate that waves do not c...
Read more

Physics : Class X Chapter: ELECTRICITY Assignment 2012-13

Image
Sadhana Devi Vidyapith, Samastipur ASSIGNMENT -1, (2012-13) By JSUNIL   Sub. – Physics, Class - X   Chapter -ELECTRICITY One mark questions 1. Define the term “electric current”. 2. Define the term ‘resistivity’ of a material. 3. How is a Voltmeter connected in the circuit to measure the potential difference between two points? 4. You have two metallic wires of resistances 6 ohm and 3 ohm. How will you connect these wires to get the effective resistance of 2 ohm? 5. If the distance between two electric charges is doubled, how much will the force exerting between them change to? Two marks questions 6. State Ohm’s law. “The resistance of a conductor is 1Ω.” What is meant by this statement? 7. Why are coils of electric toaster made of an alloy rather than a pure metal? 8. Why is the series arrangement not used for domestic circuits? 9. A wire of resistivity ‘r’ is stretched to double its length. How does it affect the (a) resistance (b) resistivity? 10. Write tw...
Read more

Derivation of Lens and mirror formula X Reflection and Refraction of light

Image
MIRROR FORMULA The relation between object distance(u), image distance(v) and the focal length (f) of the mirror is known as MIRROR FORMULA. Consider a concave mirror MM' (of small aperture). An object AB of height h is placed on the left of the mirror beyond its center of curvature so that the image formed is real, inverted and diminished in size(height = h'). Here : Object distance = PB = -u Image distance = PB'= -v Focal length = PF = -f Radius of curvature = PC = -R As shown in Figure, Δ ABP ∼ Δ A'B'P. ∴ A'B'/AB = PB'/PB ∴ A'B'/AB = (-v)/(-u) ∴ A'B'/AB = v/u.............(I) Similarly, as shown in the figure, Δ ABC ∼ Δ A'B'C. ∴ A'B'/AB = CB'/CB ∴ A'B'/AB = (PC-PB')/(PB-PC)........[as CB'=(PC-PB') and CB=(PB-PC)] ∴ A'B'/AB = [-R - (-v)]/[-u - (-R)] ∴ A'B'/AB = (-R + v)/(-u + R)........(II) By (I) & (II), v/u = (-R + v)/(-u + R) ∴ -...
Read more