MIDTERM 1 KEY

MIDTERM 1 KEY - (Chapters 2 through 7 7 The following...

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Midterm Exam 1, CHEM 001 Fall, 2006. (Chapters 2 through 7) Name: _________________________ Date: ____________ _______ 1. How many nm are there in 1.5 km? [15 pts.] _ a) 1.5 x 10 11 nm b) 1.5 x 10 13 nm c) 1.5 x 10 12 nm d) 1.5 x 10 9 nm ______ 2. 267 ° F is equivalent to… [15 pts.] a) 404 Κ b) 416 Κ c) 407 Κ d) 336 Κ ______ 3. Atoms of Sodium, Chlorine, and Aluminum have the symbols… [15 pts.] a) Na, cl, Al b) Na, Cl, Al c) Na, Cl, A d) Na, Cl, AL ______ 4. Which of the following is a chemical change? [15 pts.] a) water evaporates b) ice melts c) rocks are ground to sand d) a nail rusting ______ 5. Element X has 26 protons, 29 neutrons, and 23 electrons. Determine its identity: [15 pts.] a) 27 Mg 2+ b) 26 Mg c) 55 Fe 3+ d) 27 Al +3 ______ 6. 5.30 mL of an unknown liquid has a mass of 4.972 g. What is the density (g/mL) of the liquid? [15 pts.] a) 0.938 b) 1.07 c) 0.94 d) 0.490
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Midterm Exam 1, CHEM 001 Fall, 2006.
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Unformatted text preview: (Chapters 2 through 7) ____ 7 . The following systematic names: nitrogen dioxide, magnesium nitrate, sodium oxide and copper (II) sulfate are represented by which series of chemical formulas? [15 pts.] a. NO, MgNO 3 , NaO 2 , Cu 2 SO 4 b. NO 2 , Mg(NO 3 ) 2 , Na 2 O and CuSO 4 c. NO 2 , Mg(NO 3 ) 2 , NaO and Cu 2 SO 4 d. N 2 O 5 , Mg(NO 3 ) 2 , Na 2 O and CuSO 4 _____8. Avogadro’s number of magnesium atoms… [15 pts.] a) Have a mass of 54.94 g Mn b) Have the same mass as Avogadro’s number of sulfur atoms c) Is 1 mol of magnesium atoms d) Have a mass of 1.0 g ______9. A compound contains 52.13% C, 13.15% H, and 34.72% O. The empirical formula is… [15 pts.] a) CH 3 O b) C 4 H 12 O c) C 2 H 5 O d) C 2 H 6 O ______10. How many oxygen atoms are in 3.0 mol of N 2 O 5 ? [15 pts.] a) 5 b) 9.0 x 10 24 c) 15 d) 5.4 x 10 24...
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MIDTERM 1 KEY - (Chapters 2 through 7 7 The following...

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