CHEM107_Exam1_Study Guide Answer

CHEM107_Exam1_Study Guide Answer - Texas A & M University...

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Department of Chemistry CHEM107 Spring 2011 Instructor: Masud Monwar, Ph.D. Study Guide for Exam 1 4th February, 2011 Chapter 1: 1. Which of the following items are matter and which are not? a) Flashlight - matter b) sunlight – not a matter c) an echo – not a matter d) air at sea level matter 2. Do the terms element and atom mean the same thing? If not, how do they differ? Answer: No. The element is a substance which cannot be broken down to any other simpler substance, while atom is the smallest particle of the element which retains all the characteristics of an element. 3. Which part of the following descriptions of a compound or element refers to its physical properties and which to its chemical properties? a) Calcium carbonate is a white solid with a density of 2.71 g/cm 3 . It reacts readily with an acid to produce gaseous carbon dioxide. Answer: Physical property: White solid, density 2.71 g/cm 3 Chemical property: Calcium reacts readily with an acid and produce gaseous carbon dioxide b) Gray powdered zinc metal reacts with purple iodine to give a white compound. Answer: Physical property: gray color of zinc, purple color of iodine Chemical property: powdered zinc metal with iodine to give a white compound 4. What is the difference between a qualitative and a quantitative measurement? Answer: Quantitative measurements include a numerical value, while qualitative measurements are not associated with numerical value. 5. Identify which of the following units are base units in the SI system: grams , meters , joules , liters , amperes Answer: Meters, Joule, amperes
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6. What is a derived unit? Give two examples. Answer: A derived unit is derived from the units of two or more quantities. Examples: Unit of density: g/cm 3 Unit of speed: m/s Unit of molarity: mol/L 7. Express: a) 275 ° C in K Answer: K = 275 + 273 = 548 K b) 25.55 K in ° C Answer: 25.55 K = ° C + 273 ⇒° C = 25.55 – 273 = -247.45 ° C c) -47.0 ° C in ° F Answer: ° C = -47.0 = ° F = (1.8 × -47.0) + 32 = -52.6 ° C d) 100.0 ° F in K Answer: ° C = = 37.78 ° C K = (37.78 + 273) ° C = 310.78 K 8. Express each of the following numbers in scientific notation: a) 62.13 b) 0.000414 c) 0.000051 d) 871000000 Answer: a) 6.213 × 10 1 b) 4.14 × 10 -4 c) 5.1 × 10 -5 d) 8.71 × 10 8 9. How many significant figures are there in each of the following? a) 0.136 m b) 0.0001050 g c) 2.700×10 -3 nm d) 56003 cm 3 Answer: a) 3 b) 4 c) 4 d) 5 10. Perform these calculations and express the result with the proper number of significant figures: a) (4.850 g – 2.34 g)/ 1.3 mL Answer: = = 1.9 b) V = π r 3 , where r = 4.112 cm Answer: V = 3.14 × (4.112) 3 = 3.14 × 69.52 = 218. cm 3 c) (4.66 × 10 -3 ) × 4.666 Answer: 0.02174 = 2.17 × 10 -3 d) 0.003400/65.2 Answer: 5.21 × 10 -3 11. A sample of crude oil has a density of 0.87 g/mL. What volume in liters does a 3.6-kg sample of this oil occupy?
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Answer: 1 kg = 1000 g 3.6 kg × = 3600 g D = V = = = 4137.93 mL
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This note was uploaded on 11/05/2011 for the course CHEM 107 taught by Professor Generalchemforeng during the Spring '07 term at Texas A&M.

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CHEM107_Exam1_Study Guide Answer - Texas A & M University...

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