|
Chemistry 1210 Midterm A October 10, 2002 Dr. B. Jackson 1. Code A 2. 320 micrograms = 3.2 x 10x picograms. Ax@ equals a) -7 b) -8 c) 7 d) 8 e) none of these 3. The dosage for a medication was 1 mg/kg of body weight. What would be the dosage be for a 220 lb individual? a) 220 mg b) 200 mg c) 100 mg d) 484 mg e) none of these 4. Absolute zero is a) 0E F b) 0 K c) 0EC 5. -32EF = ____ K a) -64 b) -36 c) -237 d) 237 e) none of these 6. How many calories does it take to melt 1 gram of ice at 0EC to 1 gram of water at 0EC? a) 1 b) 60 c) 80 d) 540 7. Which of the following is the smallest unit? a) kg b) mg c) ng d) g 8. Acetone, the solvent in nail polish, has a density of 0.791 g/mL. What is the mass of 30 mL acetone? a) 23.7 g b) 37.9 g c) 0.26 g d) 13.4 g 9. Which has the larger radius, the chloride atom or the chloride ion? a) atom b) ion c) both have identical radii 10. Which of the following is the formula for magnesium nitrate? a) Mg2 (NO3) b) Mg2 (NO4) c) Mg (NO3)2 d) Mg (NO4)2 11. What is the oxidation number for Indium (In) in the formula InCl3 ? a) +1 b) +2 c) +3 d) -3 e) -6 12. Which of the following elements is the most electronegative? Al, Si, S, or P a) Al b) Si c) S d) P 13 - 16 Given 33 -2 X 16 13. The number of protons is a) 14 b) 16 c) 17 d) 33 e) 49 14. The number of electrons is a) 14 b) 16 c) 17 d) 18 e) 33 15. The number of neutrons is a) 14 b) 16 c) 17 d) 33 e) 49 16. This is a(n) a) anion b) bunion c) cation
17 - 19 Given the following equation C2H6O + 3 O2 ----> 2 CO2 + 3 H2O 17. How many grams of H2O would be produced from 23 grams of C2H6O? a) 23 b) 27 c) 9 d) 81 18. How many moles of H2O would you get if you had 2 moles of C2H6O? a) 6 b) 3 c) 2 d) 1 19. How many grams of CO2 would be generated per mol of O2? a) 44 b) 88 c) 29.3 d) 16 20. Hydrogen and tritium are isotopes. a) true b) false 21. Isotopes have a) the same atomic number and the same atomic mass b) the same atomic number and different atomic masses c) different atomic numbers and different atomic masses d) different atomic numbers and the same atomic mass 109 22. What radioisotope produces In by positron emission? 49 109 110 109 a) Cd b) In c) Sn 48 49 50 23. How many moles are present in 3.4 grams of NH3 ? a) 0.2 b) 2.0 c) 1.2 x 1023 d) 3.01 x 1023 24. How many moles of ammonia (NH3) have 2.00 x 1023 molecules? a) 0.33 b) 8 c) 5 d) 0.25 e) 1 25. How many atoms are present in 103.6 grams of lead (Pb) ? a) 2 b) 0.5 c) 3.01 x 1023 d) 6.02 x 1023 26. Given 2 moles of CO2. How many moles of oxygen atoms are present? a) 2 b) 4 c) 6 d) 1.2 x 1024 27. The Standard Temperature in STP is a) 0EF b) 0EK c) 0EC 28. If the pressure on 10 liters of a gas is decreased from 10 Atm to 5 Atm, the new volume of the gas would be a) 50 L b) 2 L c) 20 L d) 5 L 29. How many CO2 molecules are present in 5.6 L of CO2 gas at STP? a) 0.5 b) 0.25 c) 6.02 x 1023 d) 3.01 x 1023 e) 1.5 x 1023 30. What is the mass of 2 liters of O2 gas at STP? a) 64 g b) 12.02 x 1023 g c) 0.09 g d) 2.86 g e) 5.76 g 31. A gas occupied 6.15 liters at 1 atm pressure and 27EC. It had a mass of 11.0 grams. What is the gas? a) N2 b) NH3 c) CO2 d) Cl2 e) O2 32. Balance the following equation using the set of smallest whole-number coefficients. What is the sum of these coefficients? (be sure to include coefficients of A1" in the sum.) ____PbO + ___NH3 -------> ____Pb + ____N2 + ____H2O a) 9 b) 15 c) 14 d) 12 33. If Homer Simpson comes home from work radiating, he a) felt cold and turned the >cooling= off at the nuclear reactor, thinking it was the air conditioner a) has a lawyer waiting in his driveway a) no longer needs to buy light bulbs Ans: 1a; 2d; 3c; 4b; 5d; 6c; 7c; 8a; 9b; 10c; 11c; 12c; 13b; 14d; 15c; 16a; 17b; 18a; 19c; 29a; 21b; 22c; 23a; 24a; 25c; 26b; 27c; 28c; 29e; 30d; 31c; 32d; 33a
|
|
Wednesday, March 21, 2007 01:28:02 PM |