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Class 9

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Published in: Chemistry
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Law of Conservation of Mass

Suranjana M / Aurangabad

19 years of teaching experience

Qualification: M.Tech (IIT,Kharagpur - 2000)

Teaches: Science, Chemistry

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  1. Test 1 Subject- Chemistry (ICSE) Class - IX Marks 20 All questions are compulsory. 1. Choose the correct answer from the given options: a. Calcium 64 g Aqueous Solution zncog Zinc carbonate 192g Aqueous Solution cacog Calcium carbonate 152 g Zn Zinc According to the law of conservation of mass, how much zinc was present in the zinc carbonate? b. c. A 40 g B 88 g C *104 g D 256g Which chemical equation supports the law of conservation of mass? F 2H20(1) -.>H2 (g) + 02 (g) G zn(s) + HCl(aq) ZnC12 (aq) + H2 (g) H A14C3(s) + H20(/) CH41g) + Al(OH) 3(s) J *CH4 [g) + 202 (g) (g) + 2H20(g) The illustrations below show a conservation-of-mass experiment The solution in the beaker lost mass because F materials have less mass at high temperatures G the mass of the reactants and products was less than 100 g H sodium sulfate (Na2S04) is lighter than air J *some of the water molecules turned into gas 1
  2. H2SOdaq) 100g INITIAL (after H2S04 is completely added) Large amount of heat 100 g FINAL (after exothermic reaction is completed) H2S04 + 2NaOH -—9 Na2S04 + 2 1-120 Which of the following are matter? Discuss briefly. 2. Chair, air, love, small, hate, almonds,thought, cold,cold drink, smell of perfume Solution:Chair, air, almonds and cold drink What are the characteristics of particles of matter? 3. Solution: the characteristics of the particles of matter are: 1. Particles of matter have space between them. 2. Particles of matter are continuously moving. 3. Particles of matter attract each other. 4. 5. (3) (3) The mass per unit volume of a substance is called density (Density=mass/volume). Arrange the following in order of increasing density - air, exhaust from chimney, honey, water, chalk, cotton and iron. (2) Solution: Exhaust from chimneys, air, cotton, water, honey, chalk, and iron a. Tabulate the differences in the characteristics of states of matter. 2 (4)
  3. Solid Have deftntte shape Have a definite size or volume Ne compressjbGtY Cannot naw Partxles do not move freew farce of attraction between the partrles the maxtmum Liquid no not have a deftnrtc shape; they take the shape of the container a definite size or volume Sli htty compressible Can flow Particles move froe ty but are confined wtthtn a bounda force of attraction between the particles b than that •n solids, hut more than that in ases 00 not have a deftntte e.hapr; they take the shape of the container 00 not have a deftnrtc we ar vokjme H hi'/ compressible Can f low Particles can move treety force of attract•an between the partidee, tho toast. b. Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy. (2) Solution: Rigidity: Rigidity is the physical property of being stiff and resistance to bending or flowing. Solids are highly rigid. Liquids and gases are not rigid. Thus, they can easily flow and bend. Thus, liquids and gases are called fluids. Compressibility: Compressibility is the property of being able to occupy less space. Solids cannot be compressed easily. Liquids can be compressed but only to a limit. Gases are highly compressible. Fluidity: Fluidity is the ability to flow. Liquids and gases can flow. Thus, they are known as fluids. Filling a gas container: Gases are highly compressible. Thus, large volumes of gases are compressed and stored in containers so that they are easier to store and transport. Shape: Solids have definite shape and retain their shape till an outside force changes its shape. Liquids and gases do not have a definite shape. They take the shape of the container in which they are kept. Kinetic Energy: Kinetic energy is the energy possessed by objects by virtue of their motion. The greater the speed of motion, the larger is the kinetic energy. The particles of matter are continuously moving. They possess the kinetic energy. The motion of the particles is the maximum in solid and is the minimum in gases. Thus, the particles of solid have the maximum kinetic energy and the particles of gases have the minimum kinetic energy. The particles of liquid have the kinetic energy that is intermediate that of the solids and gases. Density: Density is defined as the mass per unit volume. Density refers to the amount of matter that is present per unit volume. Solids are known to have highest density and gases lowest density. Liquids have a density that is intermediate that of the solids and liquids. 3
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