CHEM103 Final Exam With Answers (12 Solved Questions)

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Final Exam - Requires Respondus LockDown Browser + Webcam Question 1 Complete the two problems below: 1. Convert 0.0000726 to exponential form and explain your answer. 2. Convert 5.82 x 10 3 to ordinary form and explain your answer. Answer: 1.Convert 0.0000726 = smaller than 1 = negative exponent, move decimal 5 places = 7.26 x 10 -5 2.Convert 5.82 x 10 3 = positive exponent = larger than 1, move decimal 3 places = 5820 Question 2 Do the conversions shown below, showing all work: 1. 358 o K = ? o C 2. 53 o C = ? o F 3. 158 o F = ? o K Answer: 1. 358 o K - 273 = 85 o C o K → o C (make smaller) -273 2. 53 o C x 1.8 + 32 = 127.4 o F o C → o F (make larger) x 1.8 + 32 3. 158 o F - 32 ÷ 1.8 = 70 + 273 = 343 o K o F → o C → o K Question 3 Show the calculation of the number of moles in the given amount of the following substances. Report your answerto 3 significant figures. 1. 12.0 grams of Ca 3 (PO 4 ) 2
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