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By John W. Moore

Rules OF CHEMISTRY: THE MOLECULAR technology bargains a rigorous and entire normal chemistry textbook in a briefer structure. This e-book deals scholars all of the issues lined within the ordinary normal path and demonstrated at the American Chemical Society checks on the related intensity and rigor because the longer books, yet at an easier-to-use measurement and a extra agreeable fee. Problem-Solving Examples, Estimation containers, visible aids, and examine instruments look all through all through to make sure that scholars grasp tough fabric and are prepared for sophistication.

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It caramelizes, turning brown. 3 Heating to a higher temperature causes further decomposition (charring) to carbon and water vapor. 4 Chemical change. Heat can caramelize or char sugar. 11 © Cengage Learning/Charles D. Winters Photos © Cengage Learning/Charles D. 6 Chemical change. Vinegar, which is an acid, has been added to an egg, causing colorless carbon dioxide gas to bubble away from the eggshell, which consists mainly of calcium carbonate. Production of gas bubbles when substances come into contact is one kind of evidence that a chemical reaction is occurring.

A scientific law is a statement that summarizes and explains a wide range of experimental results and has not been contradicted by experiments. A law can predict unknown results and also can be disproved or falsified by new experiments. When the results of a new experiment contradict a law, that’s exciting to a scientist. If enough scientists repeat the experiment and get the same contradictory result, then the law must be modified to account for the new results—or even discarded altogether. A well-tested hypothesis is designated as a theory—a unifying principle that explains a body of facts and the laws based on them.

8 g oxygen. 0 °C and boils at 100 °C (at one atmosphere pressure), and it is always a colorless liquid at room temperature. 2 Elements and Compounds A shiny, hard solid (substance A) is heated in the presence of carbon dioxide gas. After a few minutes, a white solid (substance B) and a black solid (substance C) are formed. No other substances are found. When the black solid is heated in the presence of pure oxygen, carbon dioxide is formed. Decide whether each substance (A, B, and C) is an element or a compound, and give a reason for your choice in each case.

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