{"id":22411,"date":"2021-12-30T14:19:22","date_gmt":"2021-12-30T08:49:22","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=22411"},"modified":"2022-05-19T12:22:15","modified_gmt":"2022-05-19T06:52:15","slug":"ncert-solutions-for-class-7-science-chapter-6-physical-and-chemical-changes","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/ncert-solutions\/class-7\/science\/chapter-6-physical-and-chemical-changes\/","title":{"rendered":"Ncert Solutions for Class 7 Science Chapter 6 Physical And Chemical Changes"},"content":{"rendered":"<p aria-level=\"2\"><b><span data-contrast=\"auto\">NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p aria-level=\"2\"><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p aria-level=\"2\"><span data-contrast=\"auto\">Subject specialists have designed NCERT solutions for Science Class 7 Chapter 6 which includes thorough solutions for reference. These\u202fsolutions  are updated according to the latest CBSE syllabus for 2012-22 and are provided in easy language for understanding. Tips and tricks are also provided.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">These solutions are provided so a student can clear his doubts and get help with deep understanding of the concept. Also you can refer them to make the chapter notes and revisions notes. PDF of this can also be downloaded from website.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335551550&quot;:6,&quot;335551620&quot;:6,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\"> <\/span><\/p>\n\n\t\t<div class=\"download-pdf-container\">\n\t\t\t<span class=\"title\">Do you need help with your Homework? 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underline;\">terms and conditions<\/a> and <a target=\"_blank\" href=\"https:\/\/infinitylearn.com\/privacy\" style=\"text-decoration: underline;\">privacy policy<\/a>.<\/p>\n<p><input type=\"button\" style=\"cursor:pointer;width:auto;\" class=\"il_otp_submit\" value=\"Get OTP\" onclick=\"sendCF7OTP(this, otp_phone.value, user_name.value)\"><\/p>\n<div class=\"form-submit-btn-div\" style=\"display:none;\">\n<input type=\"submit\" value=\"Download PDF\" class=\"wpcf7-form-control has-spinner wpcf7-submit download-pdf-submit\" \/>\n<\/div>\n<\/div>\n<div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div><\/form><\/div>\n\t\t\t\t\t<span class=\"pdf-link hidden\" data-pdf=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/securepdfs\/2022\/05\/PHYSICAL-CHANGE-AND-CHEMICAL-CHANGE.pdf\"><\/span>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"bg-overlay\"><\/div>\n\t\t<\/div>\n\t\t<a href=\"\/surge\/?pdfemb-serveurl=https%3A%2F%2Finfinitylearn.com%2Fsurge%2Fwp-content%2Fuploads%2Fsecurepdfs%2F2022%2F05%2FPHYSICAL-CHANGE-AND-CHEMICAL-CHANGE.pdf\" class=\"pdfemb-viewer\" style=\"\" data-width=\"max\" data-height=\"max\" data-mobile-width=\"0\"  data-scrollbar=\"both\" data-download=\"off\" data-tracking=\"on\" data-newwindow=\"on\" data-pagetextbox=\"off\" data-scrolltotop=\"on\" data-startzoom=\"100\" data-startfpzoom=\"100\" data-download-nonce=\"91a39732e0\" data-disablerightclick=\"on\" data-toolbar=\"top\" data-toolbar-fixed=\"on\">PHYSICAL CHANGE AND CHEMICAL CHANGE<br\/><\/a>\n<p>&nbsp;<\/p>\n<p><strong>Classify the changes involved in the following processes as a physical or chemical change ?<\/strong><\/p>\n<p><strong> a) Photosynthesis b) Dissolving sugar in water                              c) Burning of coal<\/strong><\/p>\n<p><strong> d) Melting of wax e) Beating Aluminium to make aluminium foil                        f) Digestion of food<\/strong><\/p>\n<p>Ans : a) Chemical change b) Physical change<\/p>\n<p>c) Chemical change d) Physical change<\/p>\n<p>e) Physical change f) Chemical change<\/p>\n<p><strong>2. State whether the following statements are true or false. In case a statement is false write the correct statement ?<\/strong><\/p>\n<p><strong> a) Cutting a log of wood into pieces is a chemical change<\/strong><\/p>\n<p><strong> b) Formation of manure from leaves is a physical change<\/strong><\/p>\n<p><strong> c) Iron pipes coated with Zinc do not get rusted easily<\/strong><\/p>\n<p><strong> d) Iron and rust are the same substances.<\/strong><\/p>\n<p><strong> e) Condensation of steam is not a chemical change.<\/strong><\/p>\n<p>Ans : a) False :<\/p>\n<p>Correct statement : cutting a log of wood into pieces is a physical change.<\/p>\n<p>b) False :<\/p>\n<p>Correct statement : Formation of manure from leaves is a chemical change.<\/p>\n<p>c) True<\/p>\n<p>d) False<\/p>\n<p>Correct statement : Iron and rust are two different substances.<\/p>\n<p>e) True<\/p>\n<p><strong>3. Fill in the blanks in the following statements<\/strong><\/p>\n<p><strong> a) When Carbon dioxide is passed through lime water, it turns milky due to the formation                                                 of ________<\/strong><\/p>\n<p><strong> b) The chemical name of baking soda is _________<\/strong><\/p>\n<p><strong> c) Two methods by which rusting of Iron can be prevented are _________ and _________<\/strong><\/p>\n<p><strong> d) Changes in which only _________ properties of a substance are Altered are called physical changes.<\/strong><\/p>\n<p><strong> e) Change in which new substances are formed are called _______ changes.<\/strong><\/p>\n<p>Ans : a) Calcium carbonate b) Sodium hydrogen carbonate (Sodium bicarbonate)<\/p>\n<p>c) Painting or greasing, Galvanization d) Physical                     e) Chemical<\/p>\n<p><strong>4. When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it ? Explain ?<\/strong><\/p>\n<p>Ans : The reaction between baking soda and lemon juice can be given as below.<\/p>\n<p>Lemon Juice + Baking Soda  Carbon dioxide + other substances<\/p>\n<p>(citric acid)      (Sodium bicarbonate)      (Bubbles)<\/p>\n<p>It is a chemical change<\/p>\n<p><strong>5. When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both physical and chemical changes take place ?<\/strong><\/p>\n<p>Ans : When a candle burns, both physical and chemical changes occur.<\/p>\n<p>i) Melting of wax, vapourisation of melted wax are physical changes<\/p>\n<p>ii) Burning of wax to give CO2, heat and light are chemical changes.<\/p>\n<p>Another example in which physical and chemical changes occur is L.P.G.<\/p>\n<p><strong>6. How would you show that setting of curd is a chemical change ?<\/strong><\/p>\n<p>Ans : We can say that setting of curd is a chemical change because we can not get back the original substance i,e. milk and curd is a new substance is formed with different taste, smell and other properties. During this process Lactose is converted into Lactic acid.<\/p>\n<p><strong>7. Explain why burning of wood and cutting it into small pieces are considered as two different types of changes ?<\/strong><\/p>\n<p>Ans : Burning of wood is a chemical change because on burning new substances are formed as follows.<\/p>\n<p>wood + Oxygen  charcoal + CO2 + heat + light<\/p>\n<p>Cutting of wood into small pieces is physical change because no new substance is formed. We can only reduce the size of wood.<\/p>\n<p><strong>8.         Describe how crystals of Copper Sulphate are formed?<\/strong><\/p>\n<p>Ans :<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-medium wp-image-22573\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/copper-sulphate-crystals-300x134.jpg\" alt=\"\" width=\"300\" height=\"134\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/copper-sulphate-crystals-300x134.jpg?v=1642486329 300w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/copper-sulphate-crystals.jpg?v=1642486329 453w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Take 100 ml of water in a clean and dry 250ml beaker and add few drops of dil . H2SO4and heat the contents of the beaker, then add powdered CuSO4 to the boiling acidulated water slowly until saturation. Now filter the solution and allow it for cooling without disturbing the beaker. After some time CuSO4 crystals are formed at the bottom of the beaker.<\/p>\n<p><strong>9. Explain how painting of an iron gate prevents it from rusting ?<\/strong><\/p>\n<p>Ans : It is known that for rusting the presence of Oxygen and moisture are essential. Painting prevents the contact of Iron with oxygen and moisture and prevents the rusting of iron gate.<\/p>\n<p><strong>10. Explain why rusting of iron objects is faster in coastal areas than in deserts ?<\/strong><\/p>\n<p>Ans : Content of moisture in the air in coastal areas is higher than the air in deserts. So the process of rusting is faster in coastal areas.<\/p>\n<p><strong>11.       The gas we use in the kitchen is called liquified petroleum gas (L P G). In the cylinder it exist as a liquid. When it comes out from the cylinder it becomes a gas (change &#8211; A) then it burns (change &#8211; B). The following statements pertain to these changes. choose the correct one?<\/strong><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-medium wp-image-22662\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/LPG-300x217.jpg\" alt=\"\" width=\"300\" height=\"217\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/LPG-300x217.jpg?v=1642486322 300w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/LPG.jpg?v=1642486322 385w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><strong>i) Process &#8211; A is a chemical change.                  <\/strong><\/p>\n<p><strong> ii) Process &#8211; B is a chemical change.<\/strong><\/p>\n<p><strong>          iii)     Both processes A and B are chemical changes.<\/strong><\/p>\n<p><strong> iv) None of these processes is a chemical change.<\/strong><\/p>\n<p>Ans : ii) Process &#8211; B is chemical change.<\/p>\n<p><strong>12. Anaerobic bacteria digest animal waste and produce biogas (Change &#8211; A). The biogas is then burnt as fuel (Change &#8211; B) the following statements pertain to these changes. choose the correct one.<\/strong><\/p>\n<p><strong> i) Process &#8211; A is a chemical change                            <\/strong><\/p>\n<p><strong> ii) Process &#8211; B is a chemical change<\/strong><\/p>\n<p><strong>iii)     Both processes A and B are chemical changes.<\/strong><\/p>\n<p><strong>iv)        None of these processes is a chemical change.<\/strong><\/p>\n<p>Ans :<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-22654\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/Biogas-tank.jpg\" alt=\"\" width=\"293\" height=\"172\" \/><\/p>\n<p>iii) Both processes A and B are chemical changes.<\/p>\n<p>&nbsp;<\/p>\n<p aria-level=\"2\"><b><span data-contrast=\"auto\">Class 7 Science NCERT Solutions for Chapter 6 \u2013 Physical and Chemical Changes<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">This chapter deal the Physical and Chemical changes through various activities. After this it talks about topic, rusting of iron and crystallisation. Infinite learn is the best source of NCERT Solutions for this chapter as it includes all the topic covered in NCERT Textbook<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p aria-level=\"3\"><b><span data-contrast=\"auto\">Important topics covered in NCERT Solutions of this Chapter<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<ol>\n<li data-leveltext=\"%1.\" data-font=\"Times New Roman\" data-listid=\"3\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\">Physical Changes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<\/ol>\n<ol>\n<li data-leveltext=\"%1.\" data-font=\"Times New Roman\" data-listid=\"3\" aria-setsize=\"-1\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"auto\">Chemical Changes<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<\/ol>\n<ol>\n<li data-leveltext=\"%1.\" data-font=\"Times New Roman\" data-listid=\"3\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"auto\">Rusting of Iron<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<\/ol>\n<ol>\n<li data-leveltext=\"%1.\" data-font=\"Times New Roman\" data-listid=\"3\" aria-setsize=\"-1\" data-aria-posinset=\"4\" data-aria-level=\"1\"><span data-contrast=\"auto\">Crystallisation<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:240}\"> <\/span><\/li>\n<\/ol>\n<p><span data-contrast=\"auto\">Further, the <\/span><span data-contrast=\"auto\">NCERT Solutions<\/span><span data-contrast=\"auto\">\u202fare also present in PDF format and students can directly assess these materials online or offline, by visiting our website of Infinite learn.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><b><span data-contrast=\"auto\">About Infinite Learn Solutions<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">Infinite Learn mission is to create world-class learning content for students. We are focussed on raising the students learning abilities. These<\/span> <span data-contrast=\"auto\">Solutions<\/span><span data-contrast=\"auto\"> have been structured very carefully to give several benefits to the students that utilize these study materials. That is why, these are crafted by subject matter experts to focus on concept and its explanation.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">For any type of support related to the NCERT Solutions for Class 7 given here, students can approach our support team who will help clear all their doubts. Students can also check out Infinite Learn for a more efficient learning experience.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p aria-level=\"2\"><b><span data-contrast=\"auto\">Frequently Asked Questions on NCERT Solutions of this Chapter<\/span><\/b><span data-ccp-props=\"{&quot;134233117&quot;:true,&quot;134233118&quot;:true,&quot;201341983&quot;:0,&quot;335559740&quot;:240}\"> <\/span><\/p>\n<p aria-level=\"3\"><b><span data-contrast=\"auto\">How many questions are present in these NCERT Solutions for Class 7 Science?<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">About 12 questions are available in these NCERT Solutions. These questions cover short answer questions and MCQs according to the latest NCERT textbook. The NCERT Solutions at Infinite learn is used to know about the method of answering complex questions. The solutions are provided by subject matter experts after taking a vast research on each concept. Students can cross check their answers and get their doubts cleared.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p aria-level=\"3\"><b><span data-contrast=\"auto\">What are the important topics covered in these NCERT Solutions?<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">The important topics are \u2013<\/span><br \/>\n<span data-contrast=\"auto\">1. Physical Changes<\/span><br \/>\n<span data-contrast=\"auto\">2. Chemical Changes<\/span><br \/>\n<span data-contrast=\"auto\">3.Rusting of Iron<\/span><br \/>\n<span data-contrast=\"auto\">4. Crystallisation<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p aria-level=\"3\"><b><span data-contrast=\"auto\">Why should we download NCERT Solutions for Class 7 Science Chapter 6 from Infinite learn?<\/span><\/b><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559738&quot;:40,&quot;335559739&quot;:0,&quot;335559740&quot;:259}\"> <\/span><\/p>\n<p><span data-contrast=\"auto\">At INFINITE LEARN you can get PDF of accurate solutions of this chapter. The NCERT Textbook Solutions for this chapter have been formulated by mathematics experts at INFINITE LEARN. All these solutions are accordance to the new pattern of CBSE, so the students can be ready for the exams.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 7 Science Chapter 6 Physical and Chemical Changes Subject specialists have designed NCERT solutions for Science [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Ncert Solutions for Class 7 Science Chapter 6 Physical And Chemical Changes","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Ncert Solutions for Class 7 Science Chapter 6 Physical And Chemical Changes","custom_permalink":"study-materials\/ncert-solutions\/class-7\/science\/chapter-6-physical-and-chemical-changes\/"},"categories":[19,81,21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ncert Solutions for Class 7 Science Chapter 6 Physical And Chemical Changes - 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