PracticeTest1a

PracticeTest1a - CHM115 Practice Exam #1 MULTIPLE CHOICE....

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CHM115 Practice Exam #1 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 1) Which one of the following is a pure substance? A) elemental copper B) concrete C) milk D) wood E) salt water 1) 2) What decimal power does the abbreviation Milli represent? A) 1 × 10 6 B) 1 × 10 3 C) 1 × 10 - 6 D) 1 × 10 - 3 E) 1 × 10 9 2) 3) The number 0.00430 has __________ significant figures. A) 6 B) 2 C) 4 D) 3 E) 5 3) 4) The density of silver is 10.5 g/cm 3 . A piece of silver that occupies a volume of 23.6 cm 3 would have a mass of __________g. A) 248 B) 23.6 C) 112 D) 0.445 E) 2.25 4) 5) 3.337 g/cm 3 = __________ kg/m 3 A) 333.7 B) 3.337 × 10 - 5 C) 0.3337 D) 3.337 × 10 - 9 E) 3337 5) 6) The correct result (indicating the proper number of significant figures) of the following addition is __________. 12 1.2 0.12 + 0.012 A) 13 B) 13.3 C) 13.33 D) 13.332 E) none of the above 6) 7) An element cannot __________. A) interact with other elements to form compounds B) be part of a homogeneous mixture C) be a pure substance D) be part of a heterogeneous mixture E) be separated into other substances by chemical means 7) 1
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8) Of the following, __________ is the smallest mass. A) 2.5 × 10 9 ng B) 2.5 × 10 - 2 mg C) 2.5 × 10 10 μ g D) 25 kg E) 2.5 × 10 15 g 8) 9) Which of the following has the same number of significant figures as the number 1.00310? A) 1 × 10 6 B) 199.791 C) 5.119 D) 100 E) 8.66 9) 10) Which of the following are chemical processes? 1. rusting of a nail 2. freezing of water 3. decomposition of water into hydrogen and oxygen gases 4. compression of oxygen gas A) 1, 3 B) 1, 4 C) 1, 3, 4 D) 2, 3, 4 E) 1, 2 10) 11) One angstrom, symbolized Å, is 10 - 10 m. 1 cm 3 = __________ Å 3 . A) 10 - 24 B) 10 24 C) 10 30 D) 10 - 30 E) 10 - 9 11) 12) The atomic number indicates __________. A) the number of neutrons in a nucleus B) the number of atoms in 1 g of an element C) the total number of neutrons and protons in a nucleus D) the number of different isotopes of an element E) the number of protons or electrons in a neutral atom
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This note was uploaded on 04/25/2010 for the course CHEM 204 taught by Professor Prof.k during the Spring '10 term at Bradley.

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PracticeTest1a - CHM115 Practice Exam #1 MULTIPLE CHOICE....

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