{"id":16606,"date":"2023-01-27T08:09:38","date_gmt":"2023-01-27T02:39:38","guid":{"rendered":"https:\/\/icsesolutions.com\/?p=16606"},"modified":"2023-01-28T10:13:55","modified_gmt":"2023-01-28T04:43:55","slug":"selina-icse-solutions-class-9-chemistry-matter-composition","status":"publish","type":"post","link":"https:\/\/icsesolutions.com\/selina-icse-solutions-class-9-chemistry-matter-composition\/","title":{"rendered":"Selina ICSE Solutions for Class 9 Chemistry – Matter and its Composition"},"content":{"rendered":"

Selina ICSE Solutions for Class 9 Chemistry – Matter and its Composition<\/span><\/strong><\/h2>\n

ICSE Solutions<\/a>Selina ICSE Solutions<\/a><\/p>\n

Download Formulae Handbook For ICSE Class 9 and 10<\/a><\/p>\n

Selina ICSE Solutions for Class 9 Chemistry Chapter 1 Matter and its Composition<\/strong><\/p>\n

Exercise 1<\/strong><\/span><\/p>\n

Solution 1.<\/strong><\/span><\/p>\n

(a) Melting point:<\/strong> The constant temperature at which a solid changes into liquid state by absorbing heat energy is called melting point.<\/p>\n

(b) Boiling point:<\/strong> It is the temperature at which a liquid changes into vapour under atmospheric pressure.<\/p>\n

(c) Evaporation:<\/strong> The slow passing of molecules of a liquid into gaseous state at a temperature below its boiling point.<\/p>\n

(d) Freezing:<\/strong> It is a process in which a liquid changes into solid state by giving out heat energy.<\/p>\n

Solution 2.<\/strong><\/span><\/p>\n

Boiling point of a liquid can be raised by increasing the atmospheric pressure.<\/p>\n

Solution 3.<\/strong><\/span><\/p>\n

On heating, solid wax melts into liquid wax, which on further heating, is converted into wax vapours. These changes can be seen in a burning candle. The candle is made up of a solid wax. When we light a candle, the wax near its wick melts. The molten wax rises up the wick and is converted into wax vapour. The wax vapour mixes with oxygen in the air and burns. In a lighted candle, you can see the solid and the liquid states of wax. The vapour of wax can be seen rising from the wick for some time after the candle is put out.
\n\"Selina<\/p>\n

Solution 4.<\/strong><\/span><\/p>\n

(a)\u00a0Sublimation:<\/strong>\u00a0The process by which a solid directly change to its\u00a0vapour\u00a0state (or gaseous state) without passing through liquid state and vice versa is called sublimation.<\/p>\n

(b)\u00a0Liquefaction:<\/strong>\u00a0It is a process of change of state of a substance from gaseous state to liquid state at a particular temperature. It is also known as condensation.<\/p>\n

(c)\u00a0Melting:<\/strong>\u00a0It is process of changing from solid state to a liquid state at a particular temperature.<\/p>\n

(d)\u00a0Boiling:<\/strong>\u00a0The process by which a liquid rapidly changes into a gaseous state, by absorbing the heat energy is called boiling.<\/p>\n

Solution 5.<\/strong><\/span><\/p>\n

(a)<\/strong><\/p>\n\n\n\n\n\n\n\n\n
An atom<\/strong><\/td>\nA molecule<\/strong><\/td>\n<\/tr>\n
Atom is a smallest particle of an element.<\/td>\nMolecule is a group of two or more atoms combined together so it is bigger.<\/td>\n<\/tr>\n
Atom consists of nucleus (containing protons and neutrons) and electrons.<\/td>\nMolecule consists of combination of two or more like or different atoms chemically bound together e.g. H2<\/sub>,\u00a0HCl,\u00a0NaCl\u00a0etc.<\/td>\n<\/tr>\n
Atom can neither be seen through naked eye nor through magnifying microscope.<\/td>\nMolecule is not visible to naked eye, while can be seen through highly magnifying microscope.<\/td>\n<\/tr>\n
Atom cannot be further divided.<\/td>\nMolecule can further be divided to give individual atoms.<\/td>\n<\/tr>\n
Atoms may or may not have independent existence.<\/td>\nMolecules are capable of having independent existence. For example, atom of oxygen (O) has no independent existence while its molecule exists as O2<\/sub>in nature.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

(b)<\/strong><\/p>\n\n\n\n\n\n\n\n
Boiling<\/strong><\/td>\nEvaporation<\/strong><\/td>\n<\/tr>\n
Boiling is the process in which liquid gets converted into gaseous state.<\/td>\nEvaporation is a process in which the liquid gets converted into its gaseous form at any temperature below its boiling point.<\/td>\n<\/tr>\n
Boiling occurs at the entire mass of the liquid. That is, it is a bulk phenomenon.<\/td>\nEvaporation occurs on the surface of the liquid. That is, it is a surface phenomenon.<\/td>\n<\/tr>\n
Boiling occurs rapidly.<\/td>\nEvaporation is a slow process.<\/td>\n<\/tr>\n
Boiling occurs at a specific temperature.<\/td>\nEvaporation occurs at any temperature.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

(c)<\/strong><\/p>\n\n\n\n\n\n\n
Melting<\/strong><\/td>\nBoiling<\/strong><\/td>\n<\/tr>\n
The process of changing from solid state to a liquid state at a particulartemperature is called melting or fusion.<\/td>\nThe\u00a0process of change of\u00a0liquid to\u00a0vapour\u00a0form all parts of the\u00a0liquid\u00a0at a particular temperature is called boiling.<\/td>\n<\/tr>\n
Melting refers to the phenomenon when a solid transforms into a liquid.<\/td>\nBoiling refers to the phenomenon when liquid transform into a gas.<\/td>\n<\/tr>\n
Example: Melting of ice<\/td>\nExample: Boiling of water<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

(d)<\/strong><\/p>\n\n\n\n\n\n\n
Gas<\/strong><\/td>\nVapour<\/strong><\/td>\n<\/tr>\n
A substance exists as a gas at the room temperature and atmospheric pressure.<\/td>\nA substance is a solid or liquid under ordinary condition but it is\u00a0gaseousunder specific conditions.<\/td>\n<\/tr>\n
It is present at ordinary conditions of temperature.<\/td>\nIts temperature is lower than the boiling point of its liquid state.<\/td>\n<\/tr>\n
e.g. – Nitrogen, oxygen.<\/td>\ne.g.\u00a0–\u00a0Iodine, Camphor<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Solution 6.<\/strong><\/span><\/p>\n

(a) Water boils of 100o<\/sup>C\u00a0under\u00a01 atmosphere\u00a0pressure.
\n(b) At high altitude water boils below\u00a0100o<\/sup>C.
\n(c) A liquid evaporates below its boiling point.
\n(d) When a substance is heated kinetic energy of the particles increases.
\n(e) Solids have the negligible inter-particle\u00a0space.
\n(f) Gases have the negligible\u00a0inter-particle forces.<\/p>\n

Solution 7.<\/strong><\/span><\/p>\n

(a) Increase in atmospheric pressure
\n(b) Sulphur
\n(c) Inter-conversion of state of matter<\/p>\n

Solution 8.<\/strong><\/span><\/p>\n

(a) Sublimation
\n(b) Melting
\n(c) Evaporation
\n(d) Vaporisation<\/p>\n

Solution 9.<\/strong><\/span><\/p>\n

(a) Increase in temperature favours Evaporation. When evaporation occurs, remaining liquid becomes cooler. The particles of the liquid absorb heat energy from surroundings to regain energy lost during evaporation which makes the surroundings cold.<\/p>\n

(b) Earthen pot has pores which help in evaporation. Some of the water continuously seeps out from these pores. This water absorbs heat of vaporization from the remaining water and gets evaporate. Thus, the remaining water loses heat and gets cooled.<\/p>\n

(c) This happens because, when the petrol changes from liquid state to the vapour state, is absorbs heat energy from the palm. The palm thus loses heat and gets cooled.<\/p>\n

(d) In humid weather wet clothes take longer time to dry up due to the slow evaporation of water from their surface.<\/p>\n

(e) Evaporation is a surface phenomenon. With increase in surface area, evaporation increases. Hot tea in Saucer cools faster than in a cup and hence we can sip faster.<\/p>\n

Solution 10.<\/strong><\/span><\/p>\n

(a) Naphthalene balls become smaller day by day as they have very weak force of attraction operating between their particles, which break away from other particles from the surface of solid without heating.<\/p>\n

(b) In gases the particles are far apart and there is enough space available for compression. Hence, gases can be compressed easily.<\/p>\n

(c) Heat energy supplied increases the rate of vibration of the particles and decreases. The inter-particle attraction.<\/p>\n

(d) Light has no mass and it does it occupy space. Thus, it is not considered as matter.<\/p>\n

(e) According to ‘Law of Conservation of Mass’, “Mass can neither be created nor destroyed in a chemical reaction.” However, it may change from one form to other.<\/p>\n

Solution 11.<\/strong><\/span><\/p>\n

In summers, we perspire more. Cotton being a good absorber of water helps in absorbing the sweat and exposes it to the atmosphere for evaporation. When sweat evaporates from our body, it takes heat from our body. The heat energy equal to the latent heat of vaporisation is absorbed from the body leaving the body cool.<\/p>\n

Solution 12.<\/strong><\/span><\/p>\n

Balloon get heat from sun and on heating, the vibration of particles increases and the inter-particle force of attraction between them gets reduced, therefore, balloon bursts.<\/p>\n

Solution 13.<\/strong><\/span><\/p>\n

Law of conservation of mass:<\/strong>\u00a0It states that mass can neither be created nor destroyed in a chemical reaction. During any change, physical or chemical, matter is neither created\u00a0nor destroyed. However it may\u00a0change from one form to another.<\/p>\n

Experimental Verification of Law of Conservation of Mass<\/strong><\/p>\n

Requirements:\u00a0<\/strong>H-shaped tube called\u00a0Landolt’s\u00a0tube, Sodium chloride solution, silver nitrate solution, etc.<\/p>\n

Procedure:<\/strong> A specially designed H-shaped tube is taken. Sodium chloride solution is taken\u00a0in one limb ofthe tube and silver nitrate solution in the other limb as\u00a0shown in figure. Both the limbs are now sealed and weighed. Now the\u00a0tubes is\u00a0averted so that the solutionscan mix up together and react chemically. The reaction takes place and a white precipitate of\u00a0silver chloride is obtained.<\/p>\n

\"Selina
\nThe tube is weighed again. The mass of the tube is found to be exactly the same as the mass\u00a0obtained before inverting the tube. Thus, this experiment clearly verifies the law of conservation of mass
\n\"Selina<\/p>\n

Solution 14.<\/strong><\/span><\/p>\n

Law of conservation of mass is applied to a burning candle. A candle is made of solid wax. When it is lighted, wax near its wick melts and changes into to liquid form. The molten wax rises up the wick and is converted into wax vapours. The wax vapours their mix with oxygen in the air.<\/p>\n

Thus, in burning of candle the matter is neither created nor destroyed but one form is changed into the other form.<\/p>\n

Solution 15.
\n<\/strong><\/span><\/p>\n

The reaction is:
\n\"Selina
\nTotal mass of\u00a0reactants\u00a0= (6 g + 5.3 g) = 11.3\u00a0g
\nTotal mass of products = (8.2 + 2.2 + 0.9) g = 11.3 g
\nAs the total mass of reactants is equal to the total mass of products. Hence, the reaction\u00a0follows\u00a0Law of conservation of mass<\/strong>.<\/p>\n

Solution 16.<\/strong><\/span><\/p>\n

The reaction will be as follows:
\nMethane + Oxygen\u00a0\u2192 Carbon dioxide + Water<\/p>\n

According to law of conservation of mass,
\n<\/strong>Total mass of reactants = Total mass of products
\nMass of methane + mass of oxygen = Mass of carbon dioxide + Mass of Water
\nMass of methane\u00a0 +\u00a0 32 g\u00a0 =\u00a0 22\u00a0 +\u00a0 18 g
\nMass of methane = (40 – 32) =\u00a08 g
\n<\/strong>8g of methane is required.<\/p>\n

Solution 17.<\/strong><\/span><\/p>\n

Word equation for the reaction is:
\nSodium + Chlorine\u00a0\u2192 Sodium Chloride<\/p>\n

According to law of conservation of mass,
\n<\/strong>Total mass of reactants = Total mass of products
\nMass of sodium + Mass of chlorine = Mass of sodium chloride
\n23 g+\u00a0Mass of chlorine =\u00a058.5 g
\nMass of chlorine = 58.5 – 23 =\u00a035.5 g
\n<\/strong>35.5 g\u00a0of chlorine is needed.<\/p>\n

Solution 18.<\/strong><\/span><\/p>\n

Word equation for the reaction is:
\nMagnesium + Oxygen\u00a0\u2192 Magnesium oxide<\/p>\n

According to law of conservation of mass<\/strong>,
\n<\/strong>Total mass of reactants = Total mass of products
\nMass of magnesium + Mass of oxide = Mass of magnesium oxide
\n4.8g\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0+\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a03.2g\u00a0\u00a0\u00a0\u00a0\u00a0= Mass of magnesium oxide
\nMass of magnesium oxide =\u00a08 g<\/strong><\/p>\n

Solution 19.<\/strong><\/span><\/p>\n

(a) (iv) No fixed shape and size highly compressible.
\n(b) (i) The solid starts melting.
\n(c) (i) evolved
\n(d) (iv) decreases with increasing pressure.
\n(e) (iii) Iodine<\/p>\n

Solution 20.<\/strong><\/span><\/p>\n

(a) does not, melting, boiling
\n(b) liquid, solid
\n(c) temperature, temperature
\n(d) gaseous, sublimation
\n(e) high and negligible<\/p>\n

Solution 21.<\/strong><\/span><\/p>\n

(a) freezing
\n(b) less
\n(c) sublimation
\n(d) remains constant<\/p>\n

Solution 22.<\/strong><\/span><\/p>\n\n\n\n\n\n\n\n
Column A<\/strong><\/td>\nColumn B<\/strong><\/td>\n<\/tr>\n
(a) Constituent of matter<\/td>\nMolecules<\/td>\n<\/tr>\n
(b) No compressibility<\/td>\nSolid<\/td>\n<\/tr>\n
(c) Maximum expansion<\/td>\nGas<\/td>\n<\/tr>\n
(d) Conversion of a gas into liquid<\/td>\nCondensation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Chemistry<\/a>Physics<\/a>Biology<\/a>Maths<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Selina ICSE Solutions for Class 9 Chemistry – Matter and its Composition ICSE SolutionsSelina ICSE Solutions Download Formulae Handbook For ICSE Class 9 and 10 Selina ICSE Solutions for Class 9 Chemistry Chapter 1 Matter and its Composition Exercise 1 Solution 1. (a) Melting point: The constant temperature at which a solid changes into liquid …<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3034],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/16606"}],"collection":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/comments?post=16606"}],"version-history":[{"count":1,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/16606\/revisions"}],"predecessor-version":[{"id":158219,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/16606\/revisions\/158219"}],"wp:attachment":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/media?parent=16606"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/categories?post=16606"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/tags?post=16606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}