1. [7 points] Which one of the following choices has the element symbol and name correctly matched?
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1 Avogadro s Number, N A = [7 points] Which one of the following choices has the element symbol and name correctly matched? (a) P, potassium (b) C, copper (c) Mg, manganese (d) Ag, silver (e) Sn, silicon 2. [7 points] Which of the following numbers has the most significant figures? (a) (b) (c) (d) (e) All of the above answers have the same number of significant figures 3. [7 points] Which one of the following is not one of the postulates of Dalton's atomic theory? (a) Each element is composed of tiny, indivisible particles called atoms. (b) All atoms of a given element are identical to each other and different from those of other elements. (c) During a chemical reaction, atoms are changed into atoms of different elements. (d) Compounds are formed when atoms of different elements combine. (e) Atoms of an element are not changed into different types of atoms by chemical reactions. 4. [7 points] What is the empirical formula of calcium nitrate? (a) Ca(NO 3 ) 2 (b) Ca 3 N 2 (c) CaNO 3 (d) CaN (e) CaNO 6
2 5. [7 points] In the Rutherford nuclear-atom model,.? (a) the protons and neutrons reside in the nucleus and are held together by the strong nuclear force, while the electrons move around the nucleus (b) the three principal subatomic particles (protons, neutrons, and electrons) all have essentially the same mass. (c) the protons and electrons reside in the nucleus and are held together by electrostatic attraction, while the neutrons move around the nucleus (d) mass is spread essentially uniformly throughout the atom (e) The three principal subatomic particles (protons, neutrons, and electrons) are distributed essentially uniformly throughout the atom 6. [7 points] In a nuclear reactor 235 U undergoes fission splitting into lighter atoms. In one such process a neutron collides with a 235 U atom to produce 142 Ba, 3 neutrons and a second isotope we ll call X, according the following reaction pathway: 1 Neutron U 142 Ba + X + 3 Neutrons What is the identity of the unknown isotope X? (a) 55 Kr (b) 93 Nb (c) 91 Kr (d) 36 Pa 7. [7 points] Which of the following compounds/mixtures will be a good conductor of electricity? (a) A AgCl crystal (b) A 3.0 M C 2 H 5 OH (ethanol) solution (c) 100 ml of pure water (d) A 0.75 M sodium nitrate solution (e) All of the above solutions will conduct electricity 8. [7 points] How many fluoride ions are present in 175 g of barium fluoride? (a) Fluoride ions (b) Fluoride ions (c) Fluoride ions (d) Fluoride ions
3 9. [7 points] Chemical analysis shows that a compound is 51.5% strontium, 29.7% ruthenium and 18.8% oxygen by mass. What is the empirical formula of this compound? (a) Sr 2 RuO 2 (b) SrRuO (c) SrRu 2 O 4 (d) SrRuO 3 (e) Sr 2 RuO [7 points] When the following equation is balanced, the coefficients are. Al(NO 3 ) 3 (aq) + Na 2 S (aq) Al 2 S 3 (s) + NaNO 3 (aq) (a) 2, 3, 1, 6 (b) 2, 1, 3, 2 (c) 1, 1, 1, 1 (d) 4, 6, 3, [7 points] What is the formula weight of ammonium sulfate? (a) 100 amu (b) 118 amu (c) 114 amu (d) 132 amu (e) 264 amu 12. [7 points] A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water. Mg 3 N 2 (s) + 3H 2 O (l) 2NH 3 (g) + 3MgO (s) The yield of MgO is 3.60 g. What is the percent yield in the reaction? (a) 94.5% (b) 78.8% (c) 46.6% (d) 49.4% (e) 99.9%
4 13. [7 points] Consider the reaction between nitrogen (N 2 ) [represented by the black spheres] and oxygen (O 2 ) [represented by the grey spheres] to produce NO 2. The balanced chemical equation for this reaction is: N 2 (g) + 2O 2 (g) 2NO 2 (g) REACTANTS PRODUCTS? If the reactants are combined in the ratio shown in the reactants box above what molecules will be present in the product box? (a) 8 NO 2 molecules (b) 6 NO 2 molecules (c) 8 NO 2 molecules + 1 O 2 molecule (d) 6 NO 2 molecules + 1 N 2 molecule 14. [7 points] If 47.2 g of methanol (CH 3 OH) is reacted with an excess of oxygen (combustion reaction) what are the theoretical yields of carbon dioxide and water? (a) 70.2 g CO g H 2 O (b) 64.8 g CO g H 2 O (c) 1.48 g CO g H 2 O (d) 32.4 g CO g H 2 O (e) 64.8 g CO g H 2 O
5 15. [7 points] What is the molarity of the solution formed by dissolving 15.2 g of potassium bromide in water to form 255 ml of solution? (a) M (b) 59.6 M (c) M (d) 1.75 M 16. [7 points] What is the concentration of the solution which results when 55.0 ml of 0.60 M NaNO 3 solution is mixed with 45.0 ml of 1.50 M NaNO 3 solution? (a) 1.85 M (b) M (c) 1.00 M (d) M 17. [7 points] What is the oxidation state (oxidation number) of sulfur in sulfuric acid? (a) +3 (b) -1 (c) 2 (d) +5 (e) [7 points] Which of the following reactions would lead to the formation of gaseous hydrogen? (a) CaCO 3 (s) + H 2 SO 4 (aq) (b) Pb(NO 3 ) 2 (aq) + HI(aq) (c) Cr(s) + HCl(aq) (d) CaCl 2 (aq) + HNO 3 (aq) (e) Pt(s) + HCl(aq) 19. [7 points] In each of the following instances two solutions are mixed together. Which reaction(s) will lead to the formation of a precipitate? (a) sodium chloride solution + calcium hydroxide solution (b) hydrochloric acid solution + sodium hydroxide solution (c) aluminum nitrate solution + sodium chloride solution (d) ammonium sulfide solution + zinc sulfate solution reactions will lead to formation of a precipitate
6 20. [7 points] We saw in class that hydrogen and oxygen react vigorously to form water. If 275 hydrogen molecules are reacted with 125 oxygen molecules in a closed container. How many hydrogen, oxygen and water molecules will remain after the reaction is complete? (a) 150 hydrogen molecules + 0 oxygen molecules water molecules (b) 0 hydrogen molecules + 25 oxygen molecules water molecules (c) 0 hydrogen molecules + 25 oxygen molecules water molecules (d) 0 hydrogen molecules + 0 oxygen molecules water molecules (e) 25 hydrogen molecules + 0 oxygen molecules water molecules 21. [7 points] A strip of zinc metal weighing 20.0 g is placed in 75.0 ml of 2.0 M copper (II) chloride solution. What is the theoretical yield of copper? (a) 9.53 g (b) 19.4 g (c) 20.0 g (d) 19.1 g 22. [7 points] Given the following net ionic equation identify the species which is oxidized. 2Ag + (aq) + Cu(s) 2Ag(s) + Cu 2+ (aq) (a) Ag (b) Cu 2+ (c) Ag + (d) Cu (e) Water 23. [7 points] If 82.1 ml of HBr solution is neutralized by titrating with 57.5 ml of 3.00 M Ba(OH) 2 solution what is the concentration of the HBr solution? (a) 1.05 M (b) 2.10 M (c) 4.20 M (d) M
7 24. [7 points] Combining aqueous solutions of BaI 2 and CuSO 4 affords a precipitate of BaSO 4. Which ion(s) is/are spectator ions in the reaction? (a) Ba 2+ only (b) Cu 2+ only (c) Ba 2+ and SO 4 2- (d) Cu 2+ and I - (e) I - only 25. [7 points] How many significant figures should there be in the answer to the following problem? ( )( ) (a) 1 (b) 4 (c) 3 (d) 2 (e) none of these
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