Midterm 1

Midterm 1 - C1404 General Chemistry Exam I 1 Isotopes of the same element have(the same different numbers of protons and(the same different numbers

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C1404 General Chemistry Exam I 1. Isotopes of the same element have (the same, different) numbers of protons and (the same, different) numbers of neutrons. a. different, the same b. different, different c. the same, different d. the same, the same e. None of the above because the number of protons and neutrons is not related to the concept of isotopes. 2. What is the atomic symbol for an element with 28 protons and 31 neutrons? a. b. c. d. e. 3. Consider the following data on the isotopes of chlorine: 35 Cl (34.97 amu, 75.78% natural abundance) 37 Cl (36.97 amu, 24.22% natural abundance). What is the average atomic mass of naturally occurring chlorine? a. 35.97 amu b. 34.97 amu c. 35.45 amu d. 36.97 amu e. 71.74 amu 4. A sample of the organic hydrocarbon molecule carotene is extracted from a carrot and found to contain 17.9 g of carbon and 2.1 g of hydrogen. A second carotene sample is synthesized in the lab and found to contain 10.0 g of carbon. How many grams of hydrogen are in the second sample? a. 0.021 g b. 0.940 g c. 1.17 g d. 2.00 g e. 1.24 g
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2 5. Consider the production of ammonia gas through the reaction of nitrogen with hydrogen as described by the balanced equation: N 2 ( g ) + 3 H 2 ( g ) 2 NH 3 ( g ) How much N 2 would be required to react completely with 1.50 mol of H 2 ? a. 14.0 g b. 28.0 g c. 42.0 g d. 126 g e. none of these 6. How many molecules are present in 36.5 g of CO 2 ? a. 8.29 x 10 -1 molecules b. 5.00 molecules c. 5.00 x 10 23 molecules d. 7.84 x 10 23 molecules e. None of the above 7. The average mass of a boron atom is 10.81. If you were able to isolate a single boron atom, what is the chance that you would randomly get an atom with mass 10.81? a. 0% b. 0.81% c. about 11% d. 10.81% e. greater than 50% 8. Consider the following unbalanced equation: C 4 H 10 + O 2 CO 2 + H 2 O Balance the equation. For every 1.0 mol of C 4 H 10 , ___ mol of O 2 is required. a. 1.0 b. 6.5 c. 8.0 d. 13.0 e. none of these
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3 9. Which of the following statements about quantum theory is incorrect ? a. The energy and position of an electron cannot be determined exactly and simultaneously. b. Lower energy orbitals are filled with electrons before higher energy orbitals. c. When filling orbitals of equal energy, two electrons will occupy the same orbital before filling a new orbital. d.
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This note was uploaded on 11/03/2011 for the course MATH 1090 taught by Professor Greenwood during the Spring '08 term at MIT.

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Midterm 1 - C1404 General Chemistry Exam I 1 Isotopes of the same element have(the same different numbers of protons and(the same different numbers

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