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exam1_sample - K‘ CHEM 101 Exam 1 October 5, 2007 Dr....

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Unformatted text preview: K‘ CHEM 101 Exam 1 October 5, 2007 Dr. Carpenter K Code 0 x”) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The size (volume or radius) of an atom is primarily a result of A) the protons and neutrons B) the protons C) the electrons D) the neutrons 2) How many nanometers are in a meter? A) 1 x 109 B) 1 x 10-9 C) 1 x 1012 D) 1 x 10—12 3) An object has kinetic energy in the amount of 356.1 I. C It is traveling 50.0 m/s. What is the mass of the object? A) 0.285 kg B) 14.2 kg C) 0.142 kg D) 445. kg 4) Given me following thermochemical equation: F2 + 2 HCl ——> 2 HF + C12 AH° = —353.1 k] How many kilojoules of heat are released when 0.500 mol of F2 react? A) 7.06 x 102 k] B) 3.53 x 102 k] C) 42.2 k] D) 1.77 x 102 k] 5) Which answer correctly displays the number below in scientific notation With 3 significant figures? 0.000005165 C) 5.17 x 10-6 A) 5.16 x 10-6 B) 5.16 x 106 D) 5.17 x 106 6) A system releases 55 k] of heat to the surroundings and has 39 k] of work performed on it. What is the change in internal energy of the system? A) —16 k] B) +16 k] ’ C) —94 k] D) +94 k] 7) A glass of ice water (water with ice in it) is a mixture. A) pure B) homogeneous C) heterogeneous D) solution 8) Complete the following and report your answer with the correct number of significant figures. (13.41 + 1.0 — 2.0365) x (6.971 - 0.06) = 7 A) 90 B) 86. C) 85.5 D) 85.51 9) What is the density of a cube that is 0.16 inches on each side and weighs 0.184 grams? A) 0.985 g/mL B) 1.36 g/mL C) 44.9 g/mL D) 2.74 g/mL / u 10) Thermal equilibrium is established when A) all of the heat from a hot object is transferred to a cold object. B) cold is transferred from a cold object to a hot one until the temperature is the same. C) heat is transferred from a hot object to a cold one until the temperature is the same. D) both objects reach room temperature. 11) How many molecules of glucose (C6I-I1206) are there in 4.5 g of glucose? A) 1.5 x1022 B) 2.7 x 1024 C) 1.3 x 10-21 D) 6.02 x 1023 12) A(n) property is dependent on the amount of substance that is present. A) intensive B) extensive C) molecular D) precise 13) Which of the following statements about intemal energy is true? A) Absolute internal energy cannot be measured. B) AE = Ejnifial — Efinal C) When AE < 0, the system has gained energy. D) Internal energy is not a state function. 14) A pound of coffee beans yields 50.0 cups of coffee. How many milliliters of coffee can be obtained from 1.00 gram of coffee beans? (1 lb = 453.6 g; 1 cup = 8 oz.; 1 oz. = 29.6 mL) A) 0.0383 mL B) 5.67 mL C) 50.7 mL D) 26.1 mL 15) 25.0 J of heat are added to two samples, A and B. The temperature of A increases by 100°C and the temperature of B increases by 200°C. Which sample has the larger specific heat? A)A B)B C) They have the same heat capacity. D) There is not enough information to determine. 16) Complete the following table: . . number of number of number of isotope atomic number mass number . protons neutrons electrons _-_—- A) 7, 15, 15, 8, 15 B) 7, 15, 7, 8, 7 C) 15, 7, 7, 8, 7 D) 15, 7, 15, 23, 7 17) You are visiting Canada and the weather report says it is going to be 20.0 degrees today! It dawns on you that they are referring to the Celcius scale. What is the temperature going to be in degrees Fahrenheit? A) 68.0 °F B) 75.0 °F C) 4.00 °F D) 28.9 °F 18) It takes 50.0 calories to heat 5.0 g of Pyrex glass from 15°C to 65°C. What is the specific heat of Pyrex glass in J/g°C? A) 0.20 J/g°c B) 0.84 J/g°C C) 0.048 I/g°C D) 0.451/g°c 19) Which of the following is a chemical change? A) melting ice B) a fence rusting C) dissolving salt in water D) breaking a piece of glass 20) 7.00 g of NH4N03(S) (molar mass = 80.0 g/mol) is dissolved in 100.0 g of water in a coffee cup calorimeter. The initial temperature is 220°C and the final temperature is 16.29°C. What is the enthalpy of the process as written below? NH4N03(s) —> NH4+(aq) + NO3'(aq) AH = 2 A) +292 k] B) 29.2 k] C) +2.56 k] D) —2.56 k] 21) What is the mass of one molecule of XeF6? A) 166.8 amu ‘ B) 359.3 amu C) 297.6 amu D) 245.3 amu 22) Calculate the standard enthalpy change for the formation of 1 mol SrC03 (s): Sr(s) + C(gmphite) + %02(g) —> SrCO3(s) Given: Sr(s) + %02(g) —> SrO(s) AH° = —592 k] SrO(s) + COz( g) —> SrCO3(s) AH° = -234 k] C(graphz'te) + 02(3) —> C02(g) AH° = -394 k] A) —2.40 x 103 k] B) +2.40 x 103 k] C) —1.22 x 103 k] ‘ D) +1.22 x 103 k] 23) Naturally occuring argon consists of three isotopes. Ar—36 has a mass of 35.9676 amu and represents 0.34% of all argon. Ar—38 has a mass of 37.9627 amu and represents 0.07% of all argon. What is the atomic mass of the third isotope, Ar—40? A) 40.000 amu C) 39.9630 amu B) 40.0987 amu D) Not enough information to determine. 24) A 3.35 g sample of benzoic acid (C7H602) was combusted in a bomb calorimeter and the temperature increased 572°C and 88.4 k] of heat were released. What is the heat capacity of the calorimeter? A) +5.06 x 102 kJ/°C B) —5.06 x 102 k]/°C C) +155 kJ/°C D) —15.5 kJ/°C 25) A local baker needs to buy some vanillin. He can buy a product that has been extracted from the vanilla bean or one that has been synthesized in a lab. He knows that it doesn't matter which one he buys because he knows the A) law of conservation of mass B) law of constant molecules C) law of multiple proportions D) law of definite proportions 26) Which of the following is NOT an SI unit? A) kg B) m/s C) °C D) second 27) Calculate the standard enthalpy change at 298 K for the reaction: CH4(g) + 4 CuO(s) —> C02(g) + 2 H200) + 4 Cu(s) m A) -62.4 kcal C) —399.0 kcal B) —217.9 kcal D) Not enough information. 28) Which of the following does not obey the law of conservation of mass? A)ZZnS+302—>ZZnO+2802 B)2H2+02—>2H20 C) C7H602 + 02 —> C02 + H20 D) 4 BC13 + P4 + 6 H2 —> 4 BP + 12 HCl 29) How many grams of potassium sulfate, K2304, would you have to weigh out in order to have 0.564 moles? A) 3.24 x 10-3 g B) 309. g C) 98.3 g D) 5.92 x 1025 g 30) Which of the follong is a halogen? I g A) Na B) Mg C) C1 D) Ar ...
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exam1_sample - K‘ CHEM 101 Exam 1 October 5, 2007 Dr....

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