CHEM 120 Week 5 Exam 2 (Units 3 and 4) Answer key

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Ellyse Perry

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Chemistry

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CHEM 120 Introduction to General, Organic & Biological Chemistry with Lab

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Chamberlain

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6

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Exam 2 Total Points: 60 PART 1: Multiple Choice questions: Q 1-24. (2 point each) Chemical reactions (equations) show the following Reactants Products Physical state of each (gas or liquid or solid) d. All of the above The following is true for a mole It is also known as Avagadro’s number It contains 6.022 * 1023 molecules It contains mass equivalent to molecular weight d. All of the above are true In balancing chemical equations, the coefficients are used to a. Show number of moles Show volume of each in liters Show amount of each in grams Show temperature at which the substance is stable 2H2 + O22H2O means that 2 grams of H2 g and 1 gram of O2 gas combine to form 2 grams of water. b. 2 moles of H2 g and 1 mole of O2 gas combine to form 2 moles of water. 2 grams of H2 g and 1 gram of O2 gas combine to form 2 moles of water. 2 molecules of H2 g and 1 molecule of O2 gas combine to form 2 molecules of water. 2H2 + O22H2O. In this equation, correct method to calculate molecular mass of water is 2[2(mass of hydrogen) + mass of oxygen] 2(mass of hydrogen gas) + mass of oxyge

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