{"id":826,"date":"2010-04-29T22:45:11","date_gmt":"2010-04-29T09:45:11","guid":{"rendered":"http:\/\/science4all.blogtown.co.nz\/?p=826"},"modified":"2010-04-29T22:45:11","modified_gmt":"2010-04-29T09:45:11","slug":"physical-change-vs-chemical-change","status":"publish","type":"post","link":"https:\/\/science4all.blogtown.co.nz\/?p=826","title":{"rendered":"Physical change VS. Chemical change"},"content":{"rendered":"<h3><span style=\"color: #ff6600\">1. Physical change is a reversible change.<\/span><\/h3>\n<p><strong><span style=\"color: #808000\"><span style=\"text-decoration: underline\">Physical changes<\/span><\/span><\/strong> involve change in position. A physical separation involves moving one substance away from another. Iron can be moved away from sulfur and iron mixture by passing a magnet over a mixture containing the two substances. Water can be moved away from passing mixture of sand and water through a funnel and catching the sand in the funnel. We begin with two separate substances, which happen to be close to each other. We en up with the same two separate substances, but they are no longer close to each other. No new substances are formed and we can easily put the parts of the mixture together again.<\/p>\n<p style=\"text-align: center\"><strong><em><span style=\"color: #0000ff\">Dissolving, melting, boiling, condensing, freezing and evaporating<\/span><\/em><\/strong><span style=\"color: #0000ff\"> are all reversible changes.<\/span><\/p>\n<p style=\"text-align: center\">&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;..<\/p>\n<h3><span style=\"color: #ff6600\">2. Chemical change is an irreversible change.<\/span><\/h3>\n<p><strong><span style=\"color: #808000\"><span style=\"text-decoration: underline\">Chemical changes<\/span><\/span><\/strong> involve changes in the connections between substances. A chemical reaction can form a new substance. However, a chemical change involves the formation of a new substance, requires energy and cannot be reversed.<\/p>\n<ul>\n<li>Cooking can cause an irreversible change. For example: an egg can be heated and cannot be returned to its previous state.<\/li>\n<li>Burning materials, such as wood, paper, natural gas, causes an irreversible change.<\/li>\n<li>Irreversible changes can form new materials that can be useful e.g. plaster of Paris and water.<\/li>\n<li>Dead plants and animals decay and some metals rust. These chemical changes are permanent.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>1. Physical change is a reversible change. Physical changes involve change in position. A physical separation involves moving one substance away from another. Iron can be moved away from sulfur and iron mixture by passing a magnet over a mixture containing the two substances. Water can be moved away from passing mixture of sand and &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/science4all.blogtown.co.nz\/?p=826\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Physical change VS. Chemical change&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1509,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"Physical change VS. Chemical change - science4all","description":"1. Physical change is a reversible change. Physical changes involve change in position. A physical separation involves moving one substance away from another. I"},"footnotes":""},"categories":[6328,6307],"tags":[],"class_list":["post-826","post","type-post","status-publish","format-standard","hentry","category-year-6-8-science","category-year9-science"],"_links":{"self":[{"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=\/wp\/v2\/posts\/826","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=\/wp\/v2\/users\/1509"}],"replies":[{"embeddable":true,"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=826"}],"version-history":[{"count":1,"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=\/wp\/v2\/posts\/826\/revisions"}],"predecessor-version":[{"id":827,"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=\/wp\/v2\/posts\/826\/revisions\/827"}],"wp:attachment":[{"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=826"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=826"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/science4all.blogtown.co.nz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}