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CHM1025FinalSol - CHM 1025 Murali Rangarajan Practice Final...

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CHM1025FinalSol - CHM 1025 Murali Rangarajan Practice Final...

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CHM 1025 Murali Rangarajan Practice Final Exam Answers Choose the best possible answer for each question. This is not the final exam, but it gives you an idea of the kind of questions one can expect in the final exam. 1. Expressed in μ L , the volume 6.35 × 10 4 L is: a. 63.5 b. 6.35 c. 635. d. 0.635 e. 0.00635 2. Expressed in scientific notation, the number 1234567890 is: a. 1.234567890 × 10 9 b. 1.234567890 × 10 8 c. 1.234567890 × 10 10 d. 1.23456789 × 10 9 e. 1.23456789 × 10 8 3. Expressed in mm 3 , the volume 4.23 × 10 9 m 3 is: a. 4.23 b. 42.3 c. 423. d. 0.423 e. 0.0423 4. If the density of a substance is 1.43 lb/ft 3 , the mass of 4.35 in 3 of the substance in grams is: [1 ft = 12 in ; 1 lb = 453.59 g ] a. 235.13 b. 12.43 c. 23.70 d. 1.63 e. 1.25 5. Simplified, the expression (8.9 × 10 5 ÷ 2.348 × 10 2 ) + 121 is: a. 3911.46 b. 3900 c. 3910 d. 3911 e. 3911.5 6. Rounded to four significant figures, the number 0.009650901 becomes: a. 0.009650 b. 0.00965 c. 0.0097 d. 0.009651 e. 0.0096509
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7. Consider the following list of substances and classify each of them as an element (E), a compound (C), a homogeneous mixture (HM), or a heterogeneous mixture (HTM): Apple juice, Chocolate Sundae, Baking Soda (Sodium hydrogen carbonate), Sulfur, Clean Air. a. C, HM, C, E, HTM b. HM, HM, C, E, HTM c. HM, HTM, C, E, HM d. HM, HTM, C, E, HTM e. C, HTM, C, E, HM 8. Classify the following three processes as physical or chemical changes: flammability of propane gas, volatility of liquid propane, compression of gaseous propane into a liquid. a. Physical, Chemical, Physical b. Chemical, Physical, Chemical c. Chemical, Chemical, Physical d. Chemical, Physical, Physical e. Physical, Physical, Chemical 9. An energy bill indicates that the customer used 955 kWh in November. How many joules did the customer use? [1 kWh = 3.60 × 10 6 J] a. 3.44 × 10 9 b. 3.44 × 10 9 c. 3.44 × 10 3 d. 3.44 × 10 3 e. 2.65 × 10 8 10. What is the temperature change in 500 mL of water when it absorbs 25 kJ of heat? [Specific heat capacity of water = 4.18 J/g- ° C ; Density of water = 1.0 g/cc .] a. 11 ° C b. 12 ° C c. 210 ° C d. 4.8 ° C e. 0.21 ° C 11. In iceboxes, ice is used to cool drinks. This is accomplished because ice melts, absorbing heat from the drink. When ice melts, it absorbs 0.33 kJ per gram. How much ice is required to cool a 12.0- oz drink from 75 ° F to 35 ° F, if the heat capacity of the drink is 4.18 J/g- ° C? (Assume that heat transfer is 100% efficient; 1 oz = 28.35 g ) a. 1.97 g b. 0.84 g c. 671.4 g d. 18. 7 kg e. 19.2 g 12. Acetic acid or vinegar, CH 3 COOH, is synthesized by the reaction of methanol and carbon monoxide. C Is this reaction endothermic or exothermic? If the density of the acid is 1.044 g/mL , what is the quantity of heat involved in the synthesis of 1.00 L of acetic acid? 3( ) ( ) 3 ( ) 3 ; = 355.9 kJ/mol CH COOH . lg l r x n H OH CO CH COOH H +→ Δ a. Endothermic, + 6.19 MJ b. Exothermic, 6.19 MJ c. Endothermic, + 22.29 kJ d. Exothermic, 22.29 kJ e. Endothermic, + 6.19 J
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13. Gallium has two naturally occurring isotopes: Ga-69 with mass 68.9256 amu and a natural abundance of 60.11% and Ga-71 with mass 70.9247 amu . Calculate the atomic mass of gallium in
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