TIMBERLAKE10_TIF_05 - An Intro to General Organic and...

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An Intro. to General, Organic, and Biological Chemistry, 10e Chapter 05: Chemical Quantities and Reactions 5.1 Multiple-Choice Questions 1) Which of the following is an example of a physical change? A) grinding coffee beans B) baking a cake C) converting water to hydrogen and oxygen D) digesting a cheeseburger E) burning coal Answer: A 2) Which of the following would NOT be a physical change? 3) Which of the following is a chemical change?
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4) Which of the following is a physical change? 5) A chemical equation is balanced when A) the total number of molecules is the same in reactants and products. B) the total number of ions is the same in reactants and products. C) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products. D) the number of atoms of each element is the same in reactants and products. E) the charge on each atom is the same in reactants and products. Answer: D 6) Which of the following gives the balanced equation for this reaction? 3 4 3 2 3 4 2 3 K PO Ca(NO ) Ca (PO ) KNO
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7) Which of the following correctly gives the best coefficients for the reaction below? 2 4 2 2 2 2 N H H O N H O 8) What coefficient is placed in front of 2 O to complete the balancing of the following equation? 5 8 2 2 2 C H ?O 5CO 4H O 9) What is the coefficient of hydrogen, 2 H , when the following equation is balanced? 2 4 2 4 3 2 Al H SO Al (SO ) ?H A) 1 B) 2 C) 3 D) 4 E) 5 Answer: C
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An Intro. to General, Organic, and Biological Chemistry, 10e Chapter 05: Chemical Quantities and Reactions Pentane ( 5 12 C H ) reacts with oxygen ( 2 O ) to form carbon dioxide ( 2 CO ) and water ( 2 H O ) according to the following reaction. Answer the following question(s) about this reaction. 5 12 2 2 2 C H ?O ?CO ?H O
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