Exam_1_Fall_2009 - CH101 (Bontems, Fall 2009 TTH)...

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Unformatted text preview: CH101 (Bontems, Fall 2009 TTH) MONTGOMERY COLLEGE Exam 1 Name: _______________________ Multiple Choice – In the blank, write the letter of the best answer. (3pts each) 1. 2. 3. How many significant figures are in the measurement 2.000 x 104 mg? a. 5 c. 1 b. 4 d. none of these How many significant figures are in the measurement 0.06060 g? a. 2 c. 4 b. 3 d. 5 The correct answer to report following sig fig rules is: a. 0.1 mol b. 0.10 mol 5.0 g = 50.00 g/mol 4. 5. 6. 7. 8. 9. c. d. 0.100 mol 0.1000 mol e. none of the above The correct answer to report following significant figure rules is: 43.7 – 2.341 = a. 41.359 g c. 41.3 g b. 41.36 g d. 41.4 g e. none of these A modest‐sized house has an area of 195 m2. What is it’s area in dm2? a. 1.95 dm2 c. 1950 dm2 b. 19.5 dm2 d. none of the above The average temperature of the universe is about 3 K. Convert his to °C. a. 270. °C c. ‐270. °C b. 276 °C d. ‐272 °C If element X consists of two isotopes 60X (75%) and 64X (25%), the atomic mass would be approximately: a. 60 amu c. 64 amu b. 61 amu d. 124 amu Which of the following pairs do you expect to be most similar? a. N and Ni c. Si and P b. Na and Mg d. Cl and F An cation is formed when an atom: a. gains neutrons b. gains protons c. loses electrons d. gains electrons e. more than one of the above 2 10. What is the molar mass of Mg(NO3)2? a. 204.3 g/mol c. 86.3 g/mol b. 134.3 g/mol d. 148.3 g/mol 11. ____ Calculate the percent oxygen in Ca(NO3)2. a. 53.9% c. 64.7% b. 10.8% d. none of these 12. Label each statement as (T) or false (F). (2 pts each) ____ PCl3 is an ionic compound. ____ Bromine is a halogen. ____ Sodium is an alkaline earth metal. ____ The element Ag forms a +1 charge. ____ Calcium is a transition metal. ____ One mole of Fe2(SO4)3 contains 3 moles sulfur and 12 moles oxygen. 13. Complete the following table. (6 pts) Symbol Mass Number Neutrons Protons Electrons Charge ‐3 35 18 +2 58 30 14. Explain or list the principles of Dalton’s atomic theory. Use complete sentences. (3 pts) Explain the difference between a mixture and a compound. Use complete sentences. (2 pts) What do each of the letters in amu represent? When would you use amu? (2 pts) 3 15. Calculate the empirical formula and molecular formula for a compound which was found to have 66.6% C and 7.01% H, 26.4% F and a molar mass of 144.1 g/mol. (Use 3 sig figs throughout.) (6 pts) (Don’t forget to calculate the molecular formula.) 16. Name the following compounds: (1.5 pts each) CuNO2 _____________________________ H2SO3 _______________________________ N2O4 _________________________________ Pb(C2H3O2)2 ____________________________ K3N __________________________________ HF ____________________________ 17. Write the correct chemical formula for the following: (1.5 pts each) aluminum hydroxide ___________________ potassium sulfate ___________________ mercury (II) permanganate ____________________ sulfur hexafluoride ___________________ silver hydrogen carbonate ___________________________ nitric acid ___________________________ 4 18. A sugar crystal contains approximately 1.8 x 1017 sucrose (C12H22O11) molecules. What is its mass in mg? (5 pts) 19. The iodide ion is a dietary mineral essential to good nutrition. The recommended daily allowance (RDA) for iodine is 150 µg/day. How much calcium iodide would you have to eat each week to obtain the recommended daily allowance? (6 pts) 20. Turn the following into balanced equations: (3 pts each) a. Fe(OH)3 + H2SO4 → Fe2(SO4)3 + H2O b. Na3PO4 + Al(NO3)3 → AlPO4 + NaNO3 c. Combustion of anisole (C7H8O) 5 ...
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This note was uploaded on 11/10/2011 for the course CH 101 taught by Professor Susanbontems during the Fall '11 term at Montgomery College.

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