9th science unit 10 matter around us book back question answer

[00:00:00]children, in the video learn ninth science learn unit 10 matter around us learn book back questions but learn First, choose the correct answer.

[00:00:09]First question, the separation of denser particles from lighter particles done by rotation at high speed is called Answer D, centrifugation.

[00:00:22]Second, among the following, dash is a mixture.

[00:00:27]Answer B, juice.

[00:00:29]Third, when we mix a drop of ink in water, we get a Answer C, homogeneous mixture.

[00:00:39]Fourth, dash is essential to perform separation by solvent extraction method.

[00:00:46]Answer A, separating funnel.

[00:00:50]Fifth, dash has the same properties throughout the sample.

[00:00:56]Answer A, pure substance.

[00:01:00]Next, true or false. First one, oil and water are immiscible with each other.

[00:01:08]True.

[00:01:09]Second, a compound cannot be broken into simpler substances chemically.

[00:01:16]This is false.

[00:01:18]A compound can be broken into simpler substances chemically.

[00:01:26]Third, liquid liquid colloids are called gels.

[00:01:32]False.

[00:01:34]Liquid to solid colloids are called gels.

[00:01:42]Fourth, buttermilk is an example of heterogeneous mixture.

[00:01:48]True.

[00:01:51]Fifth, aspirin is composed of 60% carbon, 4.5% hydrogen, and 35.5% oxygen by mass.

[00:02:02]Aspirin is a mixture.

[00:02:04]False.

[00:02:06]It is compound. It is because the components are combined in a fixed ratio by mass.

[00:02:19]Next, match the following.

[00:02:21]Element made of atoms.

[00:02:25]Compound made of molecules.

[00:02:27]Colloid pure substance.

[00:02:30]Suspension settle downs on standing.

[00:02:34]Mixture impure substance.

[00:02:38]Next, fill in the blanks.

[00:02:40]First, a dash mixture has no distinguishable boundary between its components. Answer, homogeneous.

[00:02:50]Second, an example of a substance that sublimes in Answer, camphor.

[00:02:57]Third question, alcohol can be separated from water by distillation.

[00:03:04]Fourth, in petroleum refining, the method of separation used is fractional distillation.

[00:03:12]Fifth, chromatography is based on the principle of different solubilities.

[00:03:20]Next, answer very briefly. First question, differentiate between absorption and adsorption.

[00:03:28]You got your answer page number 119 here.

[00:03:33]So, page number 119 in the chromatography paragraph. Yeah.

[00:03:38]Adsorption and the paragraph full of absorption and the paragraph full of You know, first question kind of answer.

[00:03:48]Second question, define sublimation. You got your answer page number 117 letter K.

[00:03:55]Page number 117 letter sublimation paragraph. Certain solid substances other less stuff bunny.

[00:04:06]May learn the examples ammonium chloride etc. I don't like it good second question going to answer.

[00:04:15]Third question, a few drops of Dettol when added to water the mixture turns turbid. Why? You got the answer page number 121 letter K.

[00:04:26]Page number 121 letter An emulsion is a colloid of two or more immiscible liquids other less stuff bunny and don't mix other less stuff bunny third question going to answer.

[00:04:41]Fourth, name the apparatus that you will use to separate the components of mixtures containing two >> [snorts] >> immiscible liquids miscible liquids.

[00:04:54]You got the answer page number 117 letter K.

[00:04:58]So, page [snorts] number 117 letter in the mark bunny the motto two immiscible liquids solvent extraction two miscible liquids fractional distillation.

[00:05:12]You got the fourth question going to answer.

[00:05:16]Fifth, name the components in each of the following mixtures.

[00:05:22]ice cream ice cream letter cream, milk, sugar, water either or other components.

[00:05:31]Next, lemonade.

[00:05:34]Lemonade letter lemon juice, sugar, and water.

[00:05:41]Yeah.

[00:05:43]Yeah, nitrogen, oxygen, carbon dioxide, water vapor, and other gases.

[00:05:53]After the soil, clay, sand, and various types of salts.

[00:06:09]After that, answer briefly. First question, which of the following are pure substances?

[00:06:15]Ice, milk, iron, hydrochloric acid, mercury, brick, and water.

[00:06:21]Pure substances.

[00:06:24]Ice, iron, hydrochloric acid, mercury, and water are pure substances.

[00:06:33]Second, oxygen is very essential for us to live.

[00:06:38]It forms 21% of air by volume.

[00:06:43]Is it an element or compound?

[00:06:47]Oxygen is an element. It contains the atoms of oxygen of the same kind.

[00:06:56]Third, you have just won a medal made of 22 karat gold.

[00:07:01]Have you just procured a pure substance or impure substance?

[00:07:08]I have procured an impure substance.

[00:07:11]It is made of 22 parts of pure gold and two parts of copper or silver.

[00:07:17]Because pure gold is 24 karat.

[00:07:25]Fourth, how will you separate a mixture containing sawdust, naphthalene, and iron filings?

[00:07:36]The answer, the iron filings in the mixture can be separated by magnetic separation and naphthalene by sublimation.

[00:07:45]Sawdust will be remaining at the bottom.

[00:07:51]Fifth, how are homogeneous solutions different from heterogeneous solution? Explain with example.

[00:08:03]So, page number 116 learn the homogeneous and heterogeneous mixture and the paragraph.

[00:08:17]A mixture in which the components cannot be seen separately is called homogeneous mixture. Homogeneous The next page learn It has a uniform composition and every part of the mixture has the same properties. It's the second point.

[00:08:37]Then, tap water, milk, air, ice cream, sugar syrup, ink, steel, bronze, and salt solution are homogeneous mixtures. It's the example. It's the third point.

[00:08:50]After that, heterogeneous mixture. It's the example. It's the first point. A mixture in which the components can be seen separately is called heterogeneous mixture.

[00:09:01]Second point, it does not have a uniform composition and properties.

[00:09:07]Third, soil, a mixture of iodine and common salt, a mixture of sugar and sand, a mixture of oil and water, mixture of sulfur and iron filings, and a mixture of milk and cereals. It's the It's the heterogeneous order, example.

[00:09:28]So, tablet column put it and you can either fifth question or the answer.

[00:09:35]After that, answer in detail. It's seventh Roman letter.

[00:09:39]First question, write the differences between elements and compounds and give an example for each.

[00:09:49]So, page number 115 learn.

[00:09:56]7th Roman letter Second question, explain Tyndall effect and Brownian movement with suitable diagram.

[00:10:37]So, page number 120 learn.

[00:10:58]Brownian movement in the first paragraph.

[00:11:12]After that, third question, how is the mixture of common salt, oil, and water separated?

[00:11:18]You can use a combination of different methods.

[00:11:22]You don't answer.

[00:11:27]The mixture of common salt, oil, and water taken in a beaker.

[00:11:32]The salt dissolves in water. Allow it to stand for a few minutes.

[00:11:37]The mixture of two immiscible liquids is separated by a separating funnel.

[00:11:43]The oil floats on top.

[00:11:46]The water can carefully be separated by opening the stopcock in the separating funnel.

[00:11:53]The oil is left behind in the separating funnel.

[00:11:57]The salt water is heated slowly in a distillation flask with a water condenser.

[00:12:04]The pure water vapor passes through the inner tube of the condenser.

[00:12:10]The vapors on cooling condense into pure water and are collected in a receiver.

[00:12:17]The salt is left behind in the flask as a residue.

[00:12:33]Answer very briefly the second question.

[00:12:36]Define sublimation.

[00:12:38]And fourth, name the apparatus that you will use to separate components of mixtures containing two miscible liquids, immiscible liquids.

[00:12:47]Then fifth, name the components in each of the following mixtures. It is all important.

[00:12:52]Then answer briefly the first question.

[00:12:55]Which of the following are pure substances?

[00:12:57]Second, oxygen is very essential for us to live. Are they important?

[00:13:02]Then Fifth, how are homogeneous solutions different from heterogeneous solution?

[00:13:08]It is all very important.

[00:13:10]Then answer in detail the first question. Write the difference between elements and compounds. It is all very very important.

[00:13:17]Then second question important.

[00:13:20]So the lesson complete. Thank you.

[00:13:22]Thanks for watching.