{"appState":{"pageLoadApiCallsStatus":true},"articleState":{"article":{"headers":{"creationTime":"2017-11-30T02:13:40+00:00","modifiedTime":"2017-11-30T02:13:40+00:00","timestamp":"2022-09-14T18:16:03+00:00"},"data":{"breadcrumbs":[{"name":"Academics & The Arts","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33662"},"slug":"academics-the-arts","categoryId":33662},{"name":"Study Skills & Test Prep","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33772"},"slug":"study-skills-test-prep","categoryId":33772},{"name":"GED","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33783"},"slug":"ged","categoryId":33783}],"title":"GED Science Extra Prep: Characteristics of Matter","strippedTitle":"ged science extra prep: characteristics of matter","slug":"ged-science-extra-prep-characteristics-matter","canonicalUrl":"","seo":{"metaDescription":"Each type of matter has a defining set of characteristics, and you can expect some questions on the GED Science exam to test your knowledge of what these charac","noIndex":0,"noFollow":0},"content":"Each type of matter has a defining set of characteristics, and you can expect some questions on the GED Science exam to test your knowledge of what these characteristics are.\r\n<h2 id=\"tab1\" >Practice Questions</h2>\r\n<ol>\r\n \t<li>Which of the following always stays the same when a chemical reaction takes place?\r\n\r\n<strong>A.</strong> the amount of gas\r\n<strong>B.</strong> the number of molecules\r\n<strong>C.</strong> the number of atoms\r\n<strong>D.</strong> the temperature</li>\r\n \t<li>Which of the following correctly lists the atoms in the following compounds?\r\n\r\n<strong>A.</strong> CO<sub>2</sub> has 1 chlorine atom and 2 oxygen atoms.\r\n<strong>B.</strong> H<sub>2</sub>O has 1 hydrogen atom and 2 oxygen atoms.\r\n<strong>C.</strong> C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> has 6 chlorine atoms, 12 hydrogen atoms, and 6 oxygen atoms.\r\n<strong>D.</strong> CH<sub>4</sub> has 1 carbon atom and 4 hydrogen atoms.</li>\r\n</ol>\r\n<h2 id=\"tab2\" >Answers and Explanations</h2>\r\n<ol>\r\n \t<li>The correct answer is C.\r\n\r\nThe law of conservation of mass states that matter is always conserved. For chemical equations, this means that the number of atoms of each type of element is the same at the end of the reaction as it was before the reaction; hence, Choice (C) is correct.\r\n\r\nChoice (A) is not true because chemical reactions can produce gases. Choice (B) is tempting but incorrect. It’s the number of <em>atoms,</em> not the number of <em>molecules,</em> that stays the same<em>.</em> Choice (D) is incorrect because exothermic reactions give off heat, causing the temperature of the surroundings to rise, and endothermic reactions take in heat, causing the temperature of the surroundings to fall.</li>\r\n \t<li>The correct answer is D.\r\n\r\nChoice (A) is incorrect because CO<sub>2</sub> has 1 carbon atom (not chlorine) and 2 oxygen atoms.\r\n\r\nChoice (B) is incorrect because H<sub>2</sub>O has 2 hydrogen atoms and 1 oxygen atom (not the other way around).\r\n\r\nChoice (C) is incorrect because C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> has 6 carbon atoms (not chlorine), 12 hydrogen atoms, and 6 oxygen atoms.\r\n\r\nChoice (D) is correct. CH<sub>4</sub> has 1 carbon atom and 4 hydrogen atoms.</li>\r\n</ol>","description":"Each type of matter has a defining set of characteristics, and you can expect some questions on the GED Science exam to test your knowledge of what these characteristics are.\r\n<h2 id=\"tab1\" >Practice Questions</h2>\r\n<ol>\r\n \t<li>Which of the following always stays the same when a chemical reaction takes place?\r\n\r\n<strong>A.</strong> the amount of gas\r\n<strong>B.</strong> the number of molecules\r\n<strong>C.</strong> the number of atoms\r\n<strong>D.</strong> the temperature</li>\r\n \t<li>Which of the following correctly lists the atoms in the following compounds?\r\n\r\n<strong>A.</strong> CO<sub>2</sub> has 1 chlorine atom and 2 oxygen atoms.\r\n<strong>B.</strong> H<sub>2</sub>O has 1 hydrogen atom and 2 oxygen atoms.\r\n<strong>C.</strong> C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> has 6 chlorine atoms, 12 hydrogen atoms, and 6 oxygen atoms.\r\n<strong>D.</strong> CH<sub>4</sub> has 1 carbon atom and 4 hydrogen atoms.</li>\r\n</ol>\r\n<h2 id=\"tab2\" >Answers and Explanations</h2>\r\n<ol>\r\n \t<li>The correct answer is C.\r\n\r\nThe law of conservation of mass states that matter is always conserved. 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It’s the number of <em>atoms,</em> not the number of <em>molecules,</em> that stays the same<em>.</em> Choice (D) is incorrect because exothermic reactions give off heat, causing the temperature of the surroundings to rise, and endothermic reactions take in heat, causing the temperature of the surroundings to fall.</li>\r\n \t<li>The correct answer is D.\r\n\r\nChoice (A) is incorrect because CO<sub>2</sub> has 1 carbon atom (not chlorine) and 2 oxygen atoms.\r\n\r\nChoice (B) is incorrect because H<sub>2</sub>O has 2 hydrogen atoms and 1 oxygen atom (not the other way around).\r\n\r\nChoice (C) is incorrect because C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> has 6 carbon atoms (not chlorine), 12 hydrogen atoms, and 6 oxygen atoms.\r\n\r\nChoice (D) is correct. CH<sub>4</sub> has 1 carbon atom and 4 hydrogen atoms.</li>\r\n</ol>","blurb":"","authors":[{"authorId":8947,"name":"The Experts at Dummies","slug":"the-experts-at-dummies","description":"The Experts at Dummies are smart, friendly people who make learning easy by taking a not-so-serious approach to serious stuff.","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/8947"}}],"primaryCategoryTaxonomy":{"categoryId":33783,"title":"GED","slug":"ged","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33783"}},"secondaryCategoryTaxonomy":{"categoryId":0,"title":null,"slug":null,"_links":null},"tertiaryCategoryTaxonomy":{"categoryId":0,"title":null,"slug":null,"_links":null},"trendingArticles":[{"articleId":175788,"title":"Trig Identities for Pre-Calculus","slug":"trig-identities-for-pre-calculus","categoryList":["academics-the-arts","math","pre-calculus"],"_links":{"self":"/articles/175788"}},{"articleId":147241,"title":"How to Use the 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GED Science Extra Prep: Characteristics of Matter

By: The Experts at Dummies and

Updated: 11-30-2017

From The Book: GED Test

GED Test

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Each type of matter has a defining set of characteristics, and you can expect some questions on the GED Science exam to test your knowledge of what these characteristics are.

Practice Questions

Which of the following always stays the same when a chemical reaction takes place?
A. the amount of gas B. the number of molecules C. the number of atoms D. the temperature
Which of the following correctly lists the atoms in the following compounds?
A. CO₂ has 1 chlorine atom and 2 oxygen atoms. B. H₂O has 1 hydrogen atom and 2 oxygen atoms. C. C₆H₁₂O₆ has 6 chlorine atoms, 12 hydrogen atoms, and 6 oxygen atoms. D. CH₄ has 1 carbon atom and 4 hydrogen atoms.

Answers and Explanations

The correct answer is C.
The law of conservation of mass states that matter is always conserved. For chemical equations, this means that the number of atoms of each type of element is the same at the end of the reaction as it was before the reaction; hence, Choice (C) is correct.
Choice (A) is not true because chemical reactions can produce gases. Choice (B) is tempting but incorrect. It’s the number of atoms, not the number of molecules, that stays the same. Choice (D) is incorrect because exothermic reactions give off heat, causing the temperature of the surroundings to rise, and endothermic reactions take in heat, causing the temperature of the surroundings to fall.
The correct answer is D.
Choice (A) is incorrect because CO₂ has 1 carbon atom (not chlorine) and 2 oxygen atoms.
Choice (B) is incorrect because H₂O has 2 hydrogen atoms and 1 oxygen atom (not the other way around).
Choice (C) is incorrect because C₆H₁₂O₆ has 6 carbon atoms (not chlorine), 12 hydrogen atoms, and 6 oxygen atoms.
Choice (D) is correct. CH₄ has 1 carbon atom and 4 hydrogen atoms.

About This Article

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GED Test ,

About the book author:

Stuart Donnelly, PhD, earned his doctorate in mathe-matics from Oxford University at the age of 25. Since then, he has established successful tutoring services in both Hong Kong and the United States and is considered by leading educators to be one of the most experienced and qualified private tutors in the country.

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