Form Code A. 1. Which of the following is a properly-written chemical formula or name?
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1 Form Code A NAME CHM 1025 (Spring 2019) Exam Review (Brewer) Instructions: On your Scantron form, enter and bubble your name, UFID, and Form Code (see above). Turn in only your Scantron. You may keep your exam sheet and any other papers. Check bubbling carefully: bubbling errors are non-negotiable. As on all graded events, the loving of moles applies. 1. Which of the following is a properly-written chemical formula or name? (1) Na(NO3)2 (2) aluminum (III) oxide (3) monosulfur dioxide (4) K2Cl2 (5) FeCl3 2. Which of the following ionic compounds/names are true? MgCl2 (Magnesium Dicholride) B) Fe2O3 (Iron (III) Oxide) C) PO3 (Phosphorus Trioxide) (1) B, and C (2) A only (3) A and B only (4) B only (5) C only 3. An inorganic chemist is researching the crystal field theory and is using Copper (II) Sulfate in her research. She goes to the analytical balancer and measures out grams of Copper (II) Sulfate. How many oxygen atoms are within the g sample? (1) 6.022*10 23 (2) 3.011*10 23 (3) 4.3*10 23 (4) 8.6*10 23 (5) None of the Above
2 4. The compound (X) contains % carbon, % hydrogen, % nitrogen, and 16.48% oxygen by mass. Additionally, X s molecular weight lies between the domain of Compound Y s MW and Compound Z s MW. If MWY = 188 g/mol and MWZ = 200 g/mol. Determine the molecular formula of the compound. (1) C4H5N2O (2) C8H10N4O2 (3) C8H8N3O3 (4) C10H7N5O2 (5) C8H10N2O 5. If 76.0 ml of 1.85 M NaOH is required to neutralize ml of a sulfuric acid, H2SO4, solution, what is the molarity of the sulfuric acid? (1) M H2SO4 (2) M H2SO4 (3) M H2SO4 (4) 1.55 M H2SO4 (5) 3.10 M H2SO4
3 6. What is the sum of the coefficients when the reaction is fully balanced? C3H8 (g) + O2 (g) CO2 (g) + H2O (g) (1) ten (2) eleven (3) twelve (4) thirteen (5) None of the Above 7. Which of the following is true? (1) The balanced equation of Ag2SO4 (aq) + AlCl3 (aq) AgCl (s) + Al2(SO4)3 (aq) is Ag6(SO4)3 + Al2Cl6 Ag6Cl6 + Al2(SO4)3 (2) The subscripts in a balanced equation tells how many atoms of an element there are per molecule of compound, ions there are per unit of salt, and mols of element/ion per mol of compound. (3) There are three mols of nitrate and three moles of oxygen in Iron (III) Nitrate (4) There are 6.022*10 23 mols per 1 atom of matter (5) In balancing an equation, you can add additional compounds to the reaction to balance the reaction out.
4 8. A 6.00 M solution of dye is diluted by taking ml of it and adding enough water to make ml solution. Then, ml of that solution is diluted to a volume of ml. What is the concentration of the diluted dye? (1) M (2) M (3) M (4) M (5) M 9. Suppose a small bottle of ethanol (CH3CH2OH) is combusted in a lab to form carbon dioxide and water vapor. The amount of ethanol found in the bottle was calculated to be 4.20g. However, after the reaction, only 70% of the ethanol reacted properly. How much CO2 gas was produced? (1) 8.02g (2) 0.70g (3) g (4) g (5) 5.62 g
5 10. If 4.00 g of element G reacts with 7.00 g of element M to produce g of a compound with the formula G3M4, and the atomic mass of M is amu, what is the atomic mass of G? (1) 60.5 amu (2) amu (3) 72.0 amu (4) 89.5 amu (5) 150 amu 11. A 1.0 g organic compound sample produced 2.36 grams of CO2 and grams of H2O during combustion analysis. If the hydrocarbon has a molar mass between 110 and 114 g/mol, what is its molecular formula? (1) C3H6 (2) C3H4O (3) C6H8O2 (4) CH2O3 (5) C4H8
6 12. Sweetener saccharin (C7H5NO3S) is sometimes dispensed in tablet form. Ten (10) tablets with a total mass of g were dissolved in water. They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride solution. The mass of barium sulfate obtained was g. What is the average mass percent of saccharin in the tablets? (1) 67% (2) 40% (3) 65% (4) 39.4% (5) 58.94% 13. If volumes are additive and 80.0 ml of 0.40 M sodium chloride is mixed with 120 ml of a calcium chloride solution to give a new solution in which [Cl-1] is 0.52 M, what is the concentration of the calcium chloride used to make the new solution? (1) 0.60 M (2) 0.30 M (3) M (4) M (5) 0.52 M GOOD LUCK, SMILE ON THE EXAM, and remember to love your moles: all 6.022*10 23 of them! -UF Teaching Center
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