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LATEST 2023_2024 CHEMISTRY SUMMARY QUESTIONS WITH ANSWERS ALL IN ONE
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LATEST 2023_2024 CHEMISTRY SUMMARY QUESTIONS WITH ANSWERS ALL IN ONE Example 7.1 Evidence of a Chemical Reaction Which changes involve a chemical reaction? Explain your answers. a. ice melting upon warming b. an electric current passing through water, resulting in the formation of hydrogen and...

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  • July 3, 2023
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  • 2022/2023
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Introductory Chemistry , 6th Edition Nivaldo J. Tro © 2018 Pearson Education, Inc. LATEST 2023_2024 CHEMISTRY SUMMARY QUESTIONS WITH ANSWERS ALL IN ONE Example 7.1 Evidence of a Chemical Reaction Which changes involve a chemical reaction? Explain your answers. a. ice melting upon warming b. an electric current passing through water, resulting in the formation of hydrogen and oxygen gas that appears as bubbles rising in the water c. iron rusting d. bubbles forming when a soda can is opened Solution a. not a chemical reaction; melting ice forms water, but both the ice and water are composed of water molecules. b. chemical reaction; water decomposes into hydrogen and oxygen, as evidenced by the bubbling. c. chemical reaction; iron changes into iron oxide, changing color in the process. d. not a chemical reaction; even though there is bubbling, it is just carbon dioxide coming out of the liquid. Skillbuilder 7.1 | Evidence of a Chemical Reaction Which changes involve a chemical reaction? Explain your answers. a. butane burning in a butane lighter b. butane evaporating out of a butane lighter c. wood burning Introductory Chemistry , 6th Edition Nivaldo J. Tro © 2018 Pearson Education, Inc. d. dry ice subliming For More Practice Example 7.16; Problems 25, 26, 27, 28, 29, 30. Example 7.2 Writing Balanced Chemical Equations Introductory Chemistry , 6th Edition Nivaldo J. Tro © 2018 Pearson Education, Inc. Write a balanced equation for the reaction between solid silicon dioxide and solid carbon to produce solid silicon monocarbide and carbon monoxide gas. Solution 1. Write the unbalanced equation by writing chemical formulas for each of the reactants and products. Review Chapter 5 for nomenclature rules. (If the unbalanced equation is provided in the problem, skip this step and go to Step 2.) SiO 2(s) + C(s) SiC(s) + CO(g) 2. If an element occurs in only one compound on both sides of the equation, balance it first. If there is more than one such element, balance metals before nonmetals. Begin with SI SiO 2(s) + C(s) SiC(s) + CO(g) 1 Si atom 1 Si atom Si is already balanced. Balance O Next SiO 2(s) + C(s) SiC(s) + CO(g) 2 O atoms 1 O atom To balance O, put a 2 before CO(g). SiO 2(s) + C(s) SiC(s) + 2 CO(g) 2 O atoms 2 O atoms

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