34 Solved MCQs on Chemical Principles - Examination 2 | CH 105, Exams of Chemistry

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CH 105 eee he Ww March 24, 2010 /100 (+2Bonus) EXAM 2 Form #1 Please check the following for full credit on the exam: (1) You have printed your full name on this exam and the computer bubble sheet. (2) You have entered the correct test form number on your bubble sheet. (3) You have entered the correct section number, 10153, and your NMU IN on the bubble sheet. Good Luck! Multiple Choice. Select the best answer from the choices provided. (34 questions, 3 pts each) 1. Combustion is a chemical process in which a fuel combines with to release energy and form products. a) Nitrogen Conseen ) c) methane d) hydrogen — 2. We cannot effectively clean nonpolar substances from our hands or clothing with water alone; we must add soap or detergent. The structure of a typical soap molecule is shown below. Which region of this molecule would dissolve in a nonpolar substance such as grease? Region Ca) Region EBS: i (b) Regio (c) Region 3 H HH HH HH HH HH HH H ;. NEN NON ON RN (d) Region 4 Gee CeCe Cae Gee ac Be clea Her Se oats ee oeeed : Na’ LN OPN Sas NaN eh Ne ee /\I dud hi un we wo na Regie | | Region | | Region 2 | 3. The energy stored in the chemical bonds of fossil fuels is a form of energy. (a) electrical (b) mechanical © potential PB (d) kinetic 4. A 6-L sample of water contains 120 yg of cadmium. What is this cadmium concentration, in parts per billion )b)? (ppb) ote 120g ee npb a) 720 ppb b) 0.720 ppb er ppb | & ¢ d) 0.20ppb e) 120 ppb j # ears 5. El n gravity rs a relative measure of an atom's attraction for electrons it shares in a covalent bond. is the total negative charge on a polyatomic anion. (c) is the same for all of the elements in a family or group. (d) decreases from left to right across a period on the periodic table.