Classify the following into elements, compounds and mixtures.(a) Sodium(b) Soil(c) Sugar solution

QUESTION & ANSWER SERIES
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CBSE CLASS 9 SCIENCE
CHAPTER – 2: IS MATTER AROUND US PURE?
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Questions and video link of their Solution
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👨🏼‍🎓 INTEXT QUESTIONS Page: 15

📌 Que-1. What is meant by a substance?
Solution👉 https://youtu.be/q09IuC60XS0

📌 Que-2. List the points of differences between homogeneous and heterogeneous mixtures.
Solution👉 https://youtu.be/bUjXVR5KUlE

👨🏼‍🎓 INTEXT QUESTIONS Page: 18

📌 Que-1. Differentiate between homogenous and heterogeneous mixtures with examples.
Solution👉 https://youtu.be/gTZeqcJKt4M

📌 Que-2. How are sol, solution and suspension different from each other?
Solution👉 https://youtu.be/hQ_92Qhs2rE

📌 Que-3. To make a saturated solution, 36g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Solution👉 https://youtu.be/_JzV02jcOaw

👨🏼‍🎓 INTEXT QUESTIONS Page: 24

📌 Que-1. How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), which are miscible with each other?
Solution👉 https://youtu.be/tvtj1KOl7EA

📌 Que-2. Name the techniques used to separate the following:
(a) Butter from curd.
(b) Salt from seawater
(c) Camphor from salt
Solution👉 https://youtu.be/lgW0iJcWXgk

📌 Que-3. What type of mixtures are separated by the technique of crystallization?
Solution👉 https://youtu.be/8APae_nGpe8

👨🏼‍🎓 INTEXT QUESTIONS Page: 24

📌 Que-1. Classify the following as physical or chemical changes:
o Cutting of trees
o Melting of butter in a pan
o Rusting of almirah
o Boiling of water to form steam...........
Solution👉 https://youtu.be/nqoVvGYawvI

📌 Que-2. Try segregating the things around you as pure substances and mixtures.
Solution👉 https://youtu.be/q3USvTqNzGU

👨🏼‍🎓 EXERCISE QUESTION Page: 28

📌 Que-1. Which separation techniques will you apply for the separation of the following?
(a) Sodium chloride from its solution in water.
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
(c) Small pieces of metal in the engine oil of a car.
(d) Different pigments from an extract of flower petals........
Solution👉 https://youtu.be/zBXzLTZTy44

📌 Que-2. Write the steps you would use for making tea. Use the words solution, solvent, solute, dissolve, soluble, insoluble, filtrate, and residue.
Solution👉 https://youtu.be/BZhJB38jMBE

📌 Que-3. Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of a substance dissolved in 100 grams of water to form a saturated solution).
(a) What mass of potassium nitrate would be needed to produce a saturated solution of
potassium nitrate in 50 grams of water at 313K?
(b) Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.
Solution👉 https://youtu.be/MZWiVLsiE2I

📌 Que-4. Explain the following giving examples.
(a) Saturated solution
(b) Pure substance
(c) Colloid
(d) suspension
Solution👉 https://youtu.be/v9GgWT-Cwdk

📌 Que-5. Classify each of the following as a homogeneous or heterogeneous mixture.
soda water, wood, air, soil, vinegar, filtered tea.
Solution👉 https://youtu.be/6tlF8AN8EHQ

📌 Que-6. How would you confirm that a colourless liquid given to you is pure water?
Solution👉 https://youtu.be/54pk_p7KsfQ

📌 Que-7. Which of the following materials fall into the category of “pure substance”?
(a)Ice
(b)Milk
(c)Iron.............
Solution👉 https://youtu.be/6xZU9M9PeBY

📌 Que-8. Identify the solutions among the following mixtures.
(a) Soil
(b) Sea water
(c) Air..............
Solution👉 https://youtu.be/2BURyirDSW4

📌 Que-9. Which of the following will show the “Tyndall effect”?
(a) Salt solution
(b) Milk..................
Solution👉 https://youtu.be/lRNOwfJukdg

📌 Que-10. Classify the following into elements, compounds and mixtures.
(a) Sodium
(b) Soil
(c) Sugar solution
(d) Silver...........
Solution👉https://youtu.be/ubDBq4Ny770

📌 Que-11. Which of the following are chemical changes?
(a) Growth of a plant
(b) Rusting of iron
(c) Mixing of iron filings and sand ..........
Solution👉https://youtu.be/oK1z5Nw2wfU

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