CHM121_exam1_practice

CHM121_exam1_practic - Edison,NJ08818 CHM123:SUMMER2010 Name PracticeExam1 Answerallquestions. 1 a Write the following numbers in scientific

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Middlesex County College Edison, NJ 08818 CHM 123: SUMMER 2010 Name: Practice Exam 1 Answer all questions. Express your answer in correct significant figures. 1. a) Write the following numbers in scientific notation. i) 0 . 0070450 ii) 195000 b) Find the number of significant figures in each of the following: i) 21 . 004 ii) 123 . 005 iii) 2.011 iv) 1 . 000870 2. Perform the indicated operation and express the answer in correct significant figures. a. 0.871 x 0.57 5.871 + 4.52 b. (0.00015 x 54.6) + (1.002 – 0.005)
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Multiple Proportions. Compound 1 : 18.00 g carbon (C) and 4.53 g hydrogen (H) Compound 2 : 43.20 g carbon (C) and 7.25 g hydrogen (H) 4. Determine the number of electrons, protons and neutrons in the following : 27 13 Al 3+ 56 28 Fe 2+ 32 16 S 2- 16 8 O 2 5. Convert the following : a. 3.781 m to nm b. 5.23 mg to μg c. 6.20 km to cm 6. a) How may inches are there in 42.5 cm ? ( Note : 1 inch = 2.54 cm) b) How many pounds are there in 45.0 kilograms. ( 1kg = 1000g, 1 lb = 454.0 g)
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This note was uploaded on 08/22/2011 for the course CHEMISTRY 101 taught by Professor Staff during the Spring '11 term at Middlesex CC.

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CHM121_exam1_practic - Edison,NJ08818 CHM123:SUMMER2010 Name PracticeExam1 Answerallquestions. 1 a Write the following numbers in scientific

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