(b) Potassium chloride and ammonium chloride Level sand with 320-grit sandpaper. Iron filings will get attach to the magnet and thus separate from the mixture. 12 + x = 100 (a) Chlorine gas (a) Chemical change. Show diagrammatically how water is purified in the waterworks system and list the processes involved. An element is made up of same kind of atoms. (vi) CaO. importance of the procedure is such that it is advisable to collect the Answer: both ends open. decided to make the connection between the condenser and the receiving vessel a Answer: De-icing is the process of removing snow, ice or frost from a surface. [NCERT Exemplar] Concentration of solution = \(\frac{\text { Volume of solute }}{\text { Volume of solution }} \times 100\) The apparatus used consists of three major parts:� distillation flask (or �pot�) to heat the They fixed a source of light (a torch) at one end of the box by making a hole in it and made another hole on the other side to view the light. (c) Evaporation/diffusion In what way are they different? If a beam of light is put on a milk sample contained in a beaker, the path of light beam is illuminated and becomes visible when seen from the other side. generally made of sharp pieces of broken ceramic or hard plastic.� Tubes are usually of the capillary type with They placed a milk sample contained in a beaker/tumbler in the box as shown in the figure. distillation flask requires care.� The ... water and sand (d) Kerosene oil, water and salt. (a) Is this a physical or a chemical change? something like copper wire is twisted around the tubing at the joint to prevent Calculate the percentage (by volume) of alcohol in the solution. It is collected as residue. Answer: to be distilled.� Greater filling leads Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. What do you understand by the term distillation? Answer: Question 5. By heating the saturated solution, it becomes unsaturated. Pour the mixture of kerosene oil and water in separating funnel as shown in figure. Question 13. involve rubber or cork stoppers but in more modern apparatus standard taper connections hazards associated with the distillation process have been discussed in Question 14. Matter is the stuff all around us, and all of it has mass and volume. Fractional distillation is suitable for separation of miscible liquids with a boiling point difference of about 25 K or less. [NCERT Exemplar] apparatus. How much water should be mixed with 12 mL of alcohol so as to obtain 12% alcohol solution? Rain water stored in a tank contains sand grains, unfiltrable clay particles, calcium carbonate, salt, pieces of paper and some air bubbles. Compounds – Pure sand, Ice, CaO, Ammonia gas Physical properties—(a) and (c) A solution contains 30 g of glucose, 20 g of salt in 500 mL of water. Suggest separation technique (s) one would need to employ to separate the following mixtures: How can you change a saturated solution to an unsaturated solution without adding any more solvent to it? (iii) Diamond (a) Solid potassium chloride will separate out. (e) Aluminium The filter paper was removed when the water moved near the top of the filter paper. the part to be heated, should be checked for cracks prior to use.� Connections between the glass parts may (iii) Ammonia gas .� Below is another picture of We perform the salt water wash of the hexane mixture, by simply pouring the salt water and hexane into the separatory funnel together in about equal parts and shaking well and burping, before allowing the mixture to … Answer: [NCERT Exemplar] distillation flask is heated and vapors begin to rise they will expand and ����������� The Mass of solution = 250g some impurities may remain dissolved in the solution even after filtration. They can be separated by fractional distillation. (b) Sublimation The mixture containing sand and sodium chloride left behind in the China dish.
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