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midterm1
Course: CHEM 111, Fall 2009School: UMBC
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111: Chemistry Principles of Chemistry Midterm 1: October 13, 2006 Name: ___________________________Student Number: ______________________ This exam contains 7 pages. The last page (Periodic table) may be removed. Ask if you need clarification on any of the questions. Time allotted = 50 minutes. Exam total = 50 marks Nomenclature 1. What is the name of each of the following compounds? Mg3P2______________________...
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111: Chemistry Principles of Chemistry Midterm 1: October 13, 2006
Name: ___________________________Student Number: ______________________ This exam contains 7 pages. The last page (Periodic table) may be removed. Ask if you need clarification on any of the questions. Time allotted = 50 minutes. Exam total = 50 marks Nomenclature 1. What is the name of each of the following compounds? Mg3P2______________________ Cu3PO4 _____________________ K2S2O3 ______________________ SF6 ______________________ (1 mark each)
2. What is the chemical formula of each of the following compounds? dihydrogen monoxide _______________ barium sulfide _______________ Zinc carbonate ____________________ Fe2S3 ____________________
Balance the following chemical equations: 3. PCl5(l) + H2O(l) H3PO4(aq) + HCl(aq)
(2 marks each)
4.
Cr(s)
+
S8(s)
Cr2S3(s)
5.
Complete the following table. A mass # 238 14 34 45 # neutrons Charge Q 0 4+ 2-
(5 marks) nuclide (isotope) symbol A Q ZE
Z Atomic #
# protons
#electrons 92 10
Show all of your work for the following questions in order to receive full marks. 6. Naturally occurring magnesium has the following isotopic abundances: Isotope
24 25 26
Abundance 78.99% 10.00% 11.01%
Mass (amu) 23.98504 24.98584 ?
Mg Mg Mg
What is the atomic mass of 26Mg? (5 marks)
Page 2 of 6
7. Naphthalene, the active ingredient in mothballs, is an organic compound that contains only carbon and hydrogen. Complete combustion of a 20.10 g sample of naphthalene in oxygen gave 69.00 g of CO2 and 11.30 g of H2O. a. Determine the empirical formula of naphthalene. (hint: yes this is a combustion analysis empirical formula problem like we did in class) (6 marks)
b. The molar mass for naphthalene is 128.17 g/mol. Determine the molecular formula (2 marks)
Page 3 of 6
8. The fizz produced when an Alka-Seltzer tablet is dissolved in water is due the reaction sodium between hydrogen carbonate (NaHCO3) and citric acid (H3C6H5O7): 3 NaHCO3 (aq) + H3C6H5O7 (aq) 3 CO2 (g) + 3 H2O (l) + Na3C6H5O7 (aq) In a certain experiment 2.00 g of sodium hydrogen carbonate and 1.00 g of citric acid are allowed to react (8 marks). a) Which is the limiting reactant? b) How many grams of carbon dioxide are formed? c) How many grams of excess reactant remain after the limiting reactant has been completely consumed? (molar mass (g/mol): NaHCO3, 84.01; H3C6H5O7, 192.124; CO2, 44.01)
Page 4 of 6
9. Most elements are not found pure in nature but rather exist as their ores. A common ore for iron is hematite which has the formula Fe2O3. It is possible to convert the iron from its ore to the iron (II) ion, Fe2+ in aqueous solution. This solution can then be titrated with aqueous potassium permanganate, KMnO4, according to the following balanced equation. MnO4- (aq) + 5 Fe2+ (aq) + 8 H+ (aq) Mn2+ (aq) + 5 Fe3+ (aq) + 4 H2O (l) A 2.456 g sample of iron ore requires 12.45 mL of 0.0120 M KMnO4 to reach the equivalence point. How many grams of Fe are present and what is the weight percent? (5 marks)
...
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