{"id":6672,"date":"2013-10-06T03:46:26","date_gmt":"2013-10-06T03:46:26","guid":{"rendered":"https:\/\/schooltutoring.com\/help\/?p=6350"},"modified":"2014-12-02T08:26:57","modified_gmt":"2014-12-02T08:26:57","slug":"review-of-physical-and-chemical-changes","status":"publish","type":"post","link":"https:\/\/schooltutoring.com\/help\/review-of-physical-and-chemical-changes\/","title":{"rendered":"Review of Physical and Chemical Changes"},"content":{"rendered":"<p><strong>\u00a0Overview<\/strong><\/p>\n<p>All matter can undergo physical and chemical changes.\u00a0 While physical changes do not affect the composition of matter, chemical changes transform one type of matter to another type of matter through chemical reactions.\u00a0 Without chemical reactions, many processes would not be possible, including life itself.<\/p>\n<p><strong>What Are Physical Changes?<\/strong><\/p>\n<p>If a substance changes physically, it does not change from one substance to another.\u00a0 For example, water has the same chemical composition, H<sub>2<\/sub>O, whether it is liquid water, ice, or water vapor.\u00a0 A block of gold is the same chemically whether it is in a gold bar or hammered into thin sheets.<\/p>\n<p><strong>What Evidence Shows Physical Changes Have Occurred?<\/strong><\/p>\n<p>Since physical changes do not form new substances, the properties of the substance do not change.\u00a0 If a wooden board is cut into several smaller pieces, each piece of wood will have the same chemical composition as it did when it was a larger board.\u00a0 Each piece will have changed size and shape from the original piece.<\/p>\n<p><strong>What Are Chemical Changes?<\/strong><\/p>\n<p>If a substance changes chemically, new substances are formed that do not have the same properties as the original elements or compounds that formed them.\u00a0 For example, common table salt (NaCl) does not resemble either sodium, a metal, or chlorine, a poisonous gas.\u00a0 Likewise, water (H<sub>2<\/sub>O) does not resemble either of the gases hydrogen or oxygen.<\/p>\n<p><strong>What Evidence Shows Chemical Changes Have Occurred?<\/strong><\/p>\n<p>When gas bubbles form after two substances are mixed, such as when vinegar (acetic acid) is poured on baking soda (sodium bicarbonate), it may show that there has been a chemical reaction. When an electric current is passed through water, gas bubbles of hydrogen and oxygen are formed.\u00a0 In some chemical reactions, two liquid solutions can be mixed, and a solid precipitate can be formed.<\/p>\n<p>Interested in <a href=\"https:\/\/schooltutoring.com\/tutoring-programs\/science-tutoring\/\">science tutoring services<\/a>? Learn more about how we are assisting thousands of students each academic year.<\/p>\n<p><span class=\"tutorOrange\">SchoolTutoring Academy<\/span> is the premier educational services company for K-12 and college students. We offer tutoring programs for students in K-12, AP classes, and college. To learn more about how we help parents and students in Charleston, WV visit: <a href=\"https:\/\/schooltutoring.com\/tutoring-in-charleston-west-virginia\/\">Tutoring in Charleston, WV<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00a0Overview All matter can undergo physical and chemical changes.\u00a0 While physical changes do not affect the composition of matter, chemical changes transform one type of matter to another type of matter through chemical reactions.\u00a0 Without chemical reactions, many processes would not be possible, including life itself. What Are Physical Changes? If a substance changes physically, [&hellip;]<\/p>\n","protected":false},"author":22,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[5],"tags":[263,1327],"class_list":["post-6672","post","type-post","status-publish","format-standard","hentry","category-chemistry","tag-chemical-changes","tag-physical-changes"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/posts\/6672","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/comments?post=6672"}],"version-history":[{"count":0,"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/posts\/6672\/revisions"}],"wp:attachment":[{"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/media?parent=6672"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/categories?post=6672"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/schooltutoring.com\/help\/wp-json\/wp\/v2\/tags?post=6672"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}