{"id":3637,"date":"2023-01-09T10:08:31","date_gmt":"2023-01-09T10:08:31","guid":{"rendered":"https:\/\/9thclass.deltapublications.in\/?page_id=3637"},"modified":"2025-09-06T04:52:01","modified_gmt":"2025-09-06T04:52:01","slug":"s-2-d-physical-and-chemical-changes","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/s-2-d-physical-and-chemical-changes\/","title":{"rendered":"S-2.d Physical And Chemical Changes"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Physical And Chemical Changes<\/strong><\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<div style=\"position: relative; width: 100%; height: 0; padding-top: 56.2500%;\n padding-bottom: 0; box-shadow: 0 2px 8px 0 rgba(63,69,81,0.16); margin-top: 1.6em; margin-bottom: 0.9em; overflow: hidden;\n border-radius: 8px; will-change: transform;\">\n  <iframe loading=\"lazy\" style=\"position: absolute; width: 100%; height: 100%; top: 0; left: 0; border: none; padding: 0;margin: 0;\"\n    src=\"https:\/\/www.canva.com\/design\/DAGyFScRqi4\/6VMGZXj8BmzEC_ZRkxAiLQ\/watch?embed\" allowfullscreen=\"allowfullscreen\" allow=\"fullscreen\">\n  <\/iframe>\n<\/div>\n<a href=\"https:&#x2F;&#x2F;www.canva.com&#x2F;design&#x2F;DAGyFScRqi4&#x2F;6VMGZXj8BmzEC_ZRkxAiLQ&#x2F;watch?utm_content=DAGyFScRqi4&amp;utm_campaign=designshare&amp;utm_medium=embeds&amp;utm_source=link\" target=\"_blank\" rel=\"noopener\">physical and chemical changes<\/a> by Delta publications\n<\/div>\n<\/div>\n\n\n\n<p class=\"has-text-color has-link-color has-huge-font-size wp-elements-87982a1885f28362b0345dcf26d18c66\" style=\"color:#74008b\"><strong>Key notes :<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-7767b47874b21d7e349325ce2543a05f\" style=\"color:#000060;background-color:#dfc816\"><strong>Definition<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Physical Change<\/strong>: A change in which no new substance is formed; only the physical properties (like shape, size, or state) change.<\/li>\n\n\n\n<li><strong>Chemical Change<\/strong>: A change that results in the formation of one or more new substances with different properties.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color has-large-font-size wp-elements-0c0eeea785655164152bc7de984e9c91\" style=\"color:#000060;background-color:#dfc816\"><strong>Characteristics of Physical Changes<\/strong><\/h4>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"592\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/50450d1a-9130-4503-9f19-afbea2e23b1f-1024x592.jpg\" alt=\"\" class=\"wp-image-16064\" style=\"width:522px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/50450d1a-9130-4503-9f19-afbea2e23b1f-1024x592.jpg 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/50450d1a-9130-4503-9f19-afbea2e23b1f-300x173.jpg 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/50450d1a-9130-4503-9f19-afbea2e23b1f-768x444.jpg 768w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/50450d1a-9130-4503-9f19-afbea2e23b1f.jpg 1500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Reversible in most cases (e.g., melting of ice, dissolving sugar in water).<\/li>\n\n\n\n<li>No change in the chemical composition of the substance.<\/li>\n\n\n\n<li>Energy changes are usually small.<\/li>\n\n\n\n<li>Examples: Boiling of water, breaking of glass, and stretching of rubber.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-97698eaef0134be80c9c622f8ffd8c43\" style=\"color:#000060;background-color:#dfc816\"><strong>Characteristics of Chemical Changes<\/strong><\/h4>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/07\/Characteristics-of-Chemical-Changes-1024x579.jpg\" alt=\"\" class=\"wp-image-17178\" style=\"width:558px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/07\/Characteristics-of-Chemical-Changes-1024x579.jpg 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/07\/Characteristics-of-Chemical-Changes-300x170.jpg 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/07\/Characteristics-of-Chemical-Changes-768x434.jpg 768w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/07\/Characteristics-of-Chemical-Changes.jpg 1472w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Usually irreversible (e.g., burning of wood, rusting of iron).<\/li>\n\n\n\n<li>Involves a chemical reaction and formation of new substances.<\/li>\n\n\n\n<li>Accompanied by changes like color, temperature, emission of gas, or formation of precipitate.<\/li>\n\n\n\n<li>Energy changes are significant (absorption or release of heat or light).<\/li>\n\n\n\n<li>Examples: Cooking food, photosynthesis, and combustion.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-5fd3242e10f9bbfc3f8df29ba722a459\" style=\"color:#000060;background-color:#dfc816\"><strong>Indicators of a Chemical Change<\/strong><\/h4>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"686\" height=\"386\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-54.png\" alt=\"\" class=\"wp-image-16066\" style=\"width:457px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-54.png 686w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-54-300x169.png 300w\" sizes=\"auto, (max-width: 686px) 100vw, 686px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Change in color<\/strong>: Rusting of iron changes the surface color to reddish-brown.<\/li>\n\n\n\n<li><strong>Change in temperature<\/strong>: Combustion releases heat.<\/li>\n\n\n\n<li><strong>Formation of gas<\/strong>: Effervescence observed in vinegar reacting with baking soda.<\/li>\n\n\n\n<li><strong>Formation of precipitate<\/strong>: Reaction between solutions of silver nitrate and sodium chloride forms a white precipitate of silver chloride.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-7971568716d201115ce989b14bc90aaa\" style=\"color:#000060;background-color:#dfc816\"><strong>Comparison Between Physical and Chemical Changes<\/strong><\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><strong>Aspect<\/strong><\/th><th><strong>Physical Change<\/strong><\/th><th><strong>Chemical Change<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Formation of New Substance<\/td><td>No<\/td><td>Yes<\/td><\/tr><tr><td>Reversibility<\/td><td>Mostly reversible<\/td><td>Mostly irreversible<\/td><\/tr><tr><td>Energy Change<\/td><td>Low<\/td><td>High<\/td><\/tr><tr><td>Examples<\/td><td>Melting of ice, cutting of paper<\/td><td>Burning of coal, souring of milk<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-6934563377e38c9c25c4a9b43276e0a5\" style=\"color:#000060;background-color:#dfc816\"><strong>Real-life Applications<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Physical Changes<\/strong>: Freezing water for ice, evaporating water to purify it.<\/li>\n\n\n\n<li><strong>Chemical Changes<\/strong>: Digestion of food, rust prevention, and fuel combustion.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-123856c283387b8862be45bd787fa5d0\" style=\"color:#000060;background-color:#dfc816\"><strong>Conservation of Mass<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-large-font-size\">Both physical and chemical changes obey the <strong>law of conservation of mass<\/strong>, meaning the total mass of reactants equals the total mass of products.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-a685aec72dfe8d07aaaff4b252c2dd04\" style=\"color:#000060;background-color:#dfc816\"><strong>Experiment Examples<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Physical change: Boiling water to steam.<\/li>\n\n\n\n<li>Chemical change: Adding vinegar to baking soda to observe gas release (CO\u2082 formation).<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color has-large-font-size wp-elements-e9f081e22a807eb73ba200029c3ed655\" style=\"color:#000060;background-color:#dfc816\"><strong>Common Misconceptions<\/strong><\/h4>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"760\" height=\"627\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-55.png\" alt=\"\" class=\"wp-image-16068\" style=\"width:465px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-55.png 760w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/11\/image-55-300x248.png 300w\" sizes=\"auto, (max-width: 760px) 100vw, 760px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Melting of wax is a <strong>physical change<\/strong>, but burning of wax is a <strong>chemical change<\/strong>.<\/li>\n\n\n\n<li>Dissolving sugar in water is a <strong>physical change<\/strong>, as no new substance forms.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group has-large-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\"><strong>Let&#8217;s practice!<\/strong><\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/75884\/246\/523\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-8.png\" alt=\"\" class=\"wp-image-6361\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-8.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-8-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-8-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/75913\/520\/613\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-9.png\" alt=\"\" class=\"wp-image-6362\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-9.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-9-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-9-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Physical And Chemical Changes physical and chemical changes by Delta publications Key notes : Definition Characteristics of Physical Changes Characteristics of Chemical Changes Indicators of a Chemical Change Comparison Between Physical and Chemical Changes Aspect Physical Change Chemical Change Formation of New Substance No Yes Reversibility Mostly reversible Mostly irreversible Energy Change Low High Examples<a class=\"more-link\" href=\"https:\/\/9thclass.deltapublications.in\/index.php\/s-2-d-physical-and-chemical-changes\/\">Continue reading <span class=\"screen-reader-text\">&#8220;S-2.d Physical And Chemical Changes&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-3637","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3637","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=3637"}],"version-history":[{"count":35,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3637\/revisions"}],"predecessor-version":[{"id":17636,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3637\/revisions\/17636"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}