FRANK Solutions for Class 9 Chemistry Chapter 3 - Elements, Compounds and Mixtures
Understand your syllabus concepts better with Frank Solutions for ICSE Class 9 Chemistry Chapter 3 Elements, Compounds and Mixtures. Easily understand concepts such as pure substances, impure substances, metals, non-metals and more. Also, get correct answers for MCQs and other questions from your textbook at TopperLearning.
Revise the major differences between mixtures and compounds with Frank textbook solutions. Access ICSE Class 9 Chemistry study materials to revise all the key topics in Chapter 3. You can also watch video lessons or practise sample question papers to score more marks in your final exam.
Chapter 3 - Elements, Compounds and Mixtures Exercise 41
(b) Carbon, hydrogen, Oxygen
(c) Mercury, Bromine
(d) (i) Helium
(f) Two noble gases are-
Chapter - Exercise
Chapter 3 - Elements, Compounds and Mixtures Exercise 42
(f) Oxalic acid
(g) Carbon dioxide
(d) mixture of salt and water
(i) The composition of air is not fixed i.e. the components may be present in any proportion by mass.
(ii) Components of air i.e. nitrogen, oxygen etc. do not react with each other.
Mixtures - Air, petrol, ink, gunpowder
Compounds - Common salt, alcohol, sand
(b) Atomicity - Atomicity of an element is defined as the number of atoms present in one molecule of that element.
A pure substance is one which is made up of only one kind of particles. These particles may be atoms or molecules.
They are mixtures of two or more chemically different substances mixed in indefinite proportions. The constituent substances retain their properties in the mixture.
Example-Mixture of salt and sand, gunpowder
(c) Milk Sugar solution
(b) Graphite, Iodine
(i) Copper is malleable and ductile while sulphur is neither malleable nor ductile.
(ii) Copper is a good conductor of heat while sulphur is not good conductor of heat.
Ex - Arsenic, antimony
Chapter 3 - Elements, Compounds and Mixtures Exercise 43
Advantages of chromatography -
(i) It requires a very small amount of the substance or sample.
(ii) The components retain their individuality during the process.
(iii) Chromatography finds application in easy separation of substances with similar physical and chemical properties.
(b) Filtration-It is a separation technique for separating a mixture in which one component should be solid and insoluble in the other liquid component.
Example- Barium sulphate in water.
(c) Fractional distillation -
It is a technique used to separate two liquids which dissolve in one another.The separation relies on the differences in boiling points of the two liquids.
No, mixture of chloroform and water cannot be separated by this method.
(d) Centrifugation:It is a method for separating the suspended particles of a substance from a liquid in which the mixture is rotated at a high speed in centrifuge machine.
Application - The clay particles in water (which are very fine) can be separated by centrifugation.
(b) A liquid condensed from vapour in distillation is called distillate.
(c) The liquid produced after filtering a suspension of a solid in a liquid is called filtrate.
(d) Supernatant liquid is the upper layer of fluid found after a mixture has been centrifuged.
(e) If there is a heterogeneous mixture containing an insoluble solid in a liquid, then the solid substance that settle down is called sediment.
(b) A sample of pure iodine and sodium chloride is obtained by sublimation.
(i) Size of the constituents
(ii) Magnetic properties of constituents
(iii) Mass of the constituents
(iv) Solubility of the constituents
(v) Miscibilities of the constituents
(vi) Boiling point of the constituents
(vii) Diffusion rate of the constituents
(b) Yes, mixture of chloroform (B.P.= 61oC) and carbon tetrachloride (B.P.=77OC) be satisfactorily separated by the process of fractional distillation which is used for separating the various fractions of petroleum.
For this purpose we will make two fractionating columns in the apparatus.
(i) Magnetic separation method-Separation of iron ore from impurities
(ii) Gravity separation-Mixture of saw dust and sand
(iii) Solvent extraction-Mixture of sulphur and sand
(b) Solid- liquid mixtures
(i) Evaporation-Water and sodium chloride
(ii) Distillation-Iodine in chloroform
(iii) Filtration-Barium sulphate in water
(c) Liquid-liquid mixtures
(i) By separating funnel-Oil and water mixture
(ii) Distillation-Acetone and water
(iii) Fractional distillation-Ethyl alcohol and water
Principle of chromatography: The principle of chromatography is based on the difference in the extent of interaction (absorption) of various substances with a stationary phase and a mobile phase. A substance which interacts strongly with the mobile phase goes ahead of the other substance which interacts strongly with the stationary phase.
(b) Decrease in weight - Sodium carbonate crystals
(c) No change in weight - Sodium chloride
(i) Oil and water
(ii) Chloroform and water
Chapter 3 - Elements, Compounds and Mixtures Exercise 44
(b) When'X' is treated with carbon disulphide, sulphur dissolves but not iron. While, when'Y' is treated with carbon disulphide, iron sulphide does not dissolve but sinks to the bottom of the test tube.
(c) When 'X' is treated with dilute HCl, a colourless, odourless gas hydrogen is evolved which burns with a blue flame and is extinguished with a pop sound. While, when 'Y' is treated with dilute HCl, a colourless gas with the smell of rotten eggs is evolved which is H2S.
There is difference in the behavior of 'X' and 'Y' because 'X' is a mixture while 'Y' is a compound. The component of a mixture do not react chemically, so retain their identity in the mixture while the components of compound react chemically, so do not retain their identity in the compound.
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