(a) Sand + iron (b)Cream from milk Question 9. NCERT Solutions for Class 9 Science Chapter 6 Short Answer Type Questions. Protons have a positive charge, while the neutrons are neutral. (c) 10 moles of sodium sulphite (Na2SO3)? Answer: The component of the solution that is dissolved in the solvent is called solute. Question 8. Answer: The component of the solution that dissolves the other component in it is called the solvent. Sodium carbonate + acetic acid → Sodium acetate + carbon dioxide +  water, 5.3g                             6g                 8.2g     2.2g      0.9g, As per the law of conservation of mass, the total mass of reactants must be equal to the total mass of, As per the above reaction, LHS = RHS    i.e., 5.3g + 6g = 2.2g + 0.9 g + 8.2 g = 11.3 g. Hence the observations are in agreement with the law of conservation of mass. He complained the matter to the consumer authority. Question 10. Tin – Carbon dioxide – Coal A mixture is always formed by mixing non-reacting substances. (b) 4 moles of aluminium atoms((Atomic mass of aluminium =27)? Answer: Mass of solute (sodium chloride) = 36 g Justify your answer. Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. The NCERT Solutions for Class 9 carries all the important questions and answers for all the subjects and chapters. Which law of chemical combination will govern your answer? How can we obtain different gases from air? For a better understanding of this chapter, you should also see Chapter 2 Is Matter Around Us Pure Class 9 notes , Science. NCERT Solutions for Class 9 Science are given for the students so that they can get to know the in text question and chapter end question answers in case they are not able to find it.It is important for all the students who are in Class 9th currently. Answer: Elements – Compounds – Mixtures Answer: Question 1. (h) Magnetic separation Answer: (a) Solution: It is a homogeneous mixture of two or more substances. Answer: Water can dissolve large number of substances in it. relative number and kinds of atoms are equal in given compounds. Answer 2: In dirty clothes, the dust particles are present on oil are present on oil drops sticking to them. Because of scattering the path of the light as well as the particle become visible. (a) face-cream (b) emulsion It is because the solute particle has taken all the inter molecular space present in the solvent. Answer: By finding the boiling point of a given colourless liquid. Answer: Crystallisation technique is used to purify solid with some impurities in it. E.g., smoke, fog. (i) Wheat grains from husk. (a) crystallise (b) evaporate Answer: Applications of chromatography are, Question 10. The mass of the above mentioned list is as follows: Mass of 1 mole of nitrogen atoms= Atomic mass of nitrogen atoms, Therefore, mass of 1 mole of nitrogen atom is 14g, 1 mole of aluminium atoms = 27g, 4 moles of aluminium atoms = 4 x 27 = 108g, (c) Mass of 1 mole of sodium sulphite Na2SO3 = Molecular mass of sodium sulphite = 2 x Mass of Na + Mass of S + 3 x Mass of O =  (2 x 23) + 32 +(3x 16) = 46+32+48 = 126g, Therefore, mass of 10 moles of Na2SO3  = 10 x 126 = 1260g. Question 3. Question 5. Question 19. Calculate the percentage composition of the compound by weight. Therefore, brass is regarded as a substitutional solid solution. Required fields are marked *, Frequently Asked Questions on Chapter 3 Atoms And Molecules. UP Board students can download UP Board Solutions for class 9 Science chapter 2 in Hindi Medium. It is used to purify solids. Answer: NCERT Solutions For Class 9 Science Chapter 2 Value-Based Questions. Answer: Properties of a suspension. Pure substances always have the same colour, taste and texture at a given temperature and pressure. Give the names of the elements present in the following compounds. (d) Silver (e) Calcium carbonate (f) Tin (e) Centrifugation Example: Salt from sea-water. It gives a thorough understanding of the concepts. 3. To separate the components of water, we need electrolytic cell, and it is not a simple process. Answer: Air is a homogeneous mixture and its components can be separated by fractional distillation. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium acetate. Download Class 9 Science App for offline use. All gases are present in different amount. Class 9 Science Chapter 2 question-answers of Page 15, Page 18, Page 24 and Exercises in English Medium or पेज 16 के उत्तर, पेज 20 के उत्तर, पेज 26 के उत्तर, पेज 27 के उत्तर and अभ्यास के प्रश्न उत्तर in Hindi Medium. The smallest unit of matter is an atom. 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(c) centrifugation (d) both (b) and (c) Stuck At Home? gasses, they do not exist independently. 3. Calculate the number of aluminium ions present in 0.051g of aluminium oxide. Which of the following is liquid-liquid solution? (c) milk (d) all of these The postulate of Dalton’s atomic theory that can explain the law of definite proportions is – the Anil’s sister acddentally added some water into the bottle containing olive oil and she was afraid of the scolding. Question 9. Some solids decompose or some, like sugar may get charred on heating to dryness. What is Tyndall effect? relative number and kinds of atoms are equal in given compounds. Explain the following giving examples: The following are the chemical formula of the above-mentioned list: 5. E.g., milk and blood. Answer: Chemical changes are: Calculate the molar mass of the following substances. (c) starch solution (d) copper sulphate solution Sugar is soluble in water completely. How will he do this? Answer: Water is a compound because if we pass electricity through it then at two different electrodes, we get two different gases i.e., oxygen and hydrogen during electrolysis of water.