Exam 2 Chemistry 65 Summer Score:

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1 Name: Exam 2 Chemistry 65 Summer 2015 Score: Instructions: Clearly circle the one best answer

2 1. Valence electrons are electrons located A) in the outermost energy level of an atom. B) in the nucleus of an atom. C) in the innermost energy level of an atom. D) throughout the atom. E) in the first three shells of an atom. 2. The number of electrons in the highest energy level of nitrogen is A) one. B) two. C) three. D) four. E) five. 3. Which of the following represents the correct electron-dot structure for Cl? A) B) C) D) E) 4. The octet rule indicates that A) all of the noble gases have eight total electrons. B) all of the shells in an atom hold a maximum of 8 electrons. C) all of the Group A elements have 8 valence electrons. D) atoms lose, gain, or share valence electrons to have 8 valence electrons. E) the noble gases react with other compounds to get 8 valence electrons. 5. In ionic compounds, lose their valence electrons to form positively charged. A) metals; anions B) nonmetals; cations C) metals; polyatomic ions D) nonmetals; anions E) metals; cations 6. What is the symbol for the ion with 19 protons and 18 electrons? A) F+ B) F- C) Ar+ D) K- E) K+

3 7. What is the ionic charge of an ion with 13 protons and 10 electrons? A) 1+ B) 2+ C) 3+ D) 2- E) 3- Answer: C 8. What is the correct formula for the oxide ion? A) O 2- B) O - C) O + D) O 2+ E) O What is the correct formula for the iron (II) ion? A) Fe + B) Fe 2+ C) Fe 3+ D) Fe 2- E) Fe Which of the following polyatomic ions has a positive charge? A) hydroxide B) sulfate C) hydrogen carbonate D) ammonium E) nitrate 11. Which of the following elements does NOT exist as a diatomic molecule? A) hydrogen B) nitrogen C) chlorine D) oxygen E) carbon 12. Double and triple bonds form because A) the atoms involved have high electronegativities. B) single covalent bonds do not give all of the atoms in the molecule eight valence electrons. C) one of the atoms in the molecule has more than eight valence electrons.

4 D) the ions involved have charges larger than one. E) there is at least one hydrogen atom involved in the bond. 13. Which of the following correctly gives the best coefficients for the reaction below? N 2 H 4 + H 2 O 2 N 2 + H 2 O A) 1, 1, 1,1 B) 1, 2, 1, 4 C) 2, 4, 2, 8 D) 1, 4, 1, 4 E) 2, 4, 2, What coefficient is placed in front of O 2 to complete the balancing of the following equation? C 5 H 8 +? O 2 5CO 2 + 4H 2 O A) 1 B) 3 C) 5 D) 7 E) In the following reaction, when the equation is correctly balanced, what is the correct coefficient for H 2? Fe(s) + HCl(aq) FeCl 3 (aq) + H 2 (g) A) 1 B) 2 C) 3 D) 4 E) 5 Answer: C 16. What is the classification for this reaction? SO 3 (g) + H2O (l) H2SO 4 (l) A) decomposition B) combination C) replacement D) double replacement E) oxidation reduction

5 17. How many hydrogen atoms are present in 75.0 of g H 2 O? A) 75.0 atoms B) 4.17 atoms C) atoms D) atoms E) atoms 18. How many moles of iron are present in atoms of iron? A) 5.23 moles B) 1.90 moles C) 292 moles D) moles E) moles mole of lithium weighs A) 3.00 g. B) g. C) 6.94 g. D) g. E) g. 20. What is the molar mass of copper(ii) sulfate, CuSO 4? A) 16.0 g B) 63.6 g C) g D) g E) g 21. Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O 2 to the number of moles of Fe 2 O 3 produced? 4Fe(s) + 3O 2 (g) 2Fe 2 O 3 (s) A) B) C)

6 D) E) 22. Considering the limiting reactant concept, how many moles of sodium chloride are produced from the reaction of mol of sodium and mol of chlorine gas? 2 Na(s) + Cl2(g) NaCl(s) A) mol B) mol C) mol D) mol E) none of the above 23. Considering the limiting reactant, what is the mass of manganese produced from 25.0 g of manganese(iv) oxide (86.94 g/mol) and 25.0 g of aluminum metal? 3 MnO2(l) + 4 Al(l) 3 Mn(l) + 2 Al2O3(s) A) 15.8 g B) 38.2 g C) 47.4 g D) 50.9 g E) 67.8 g 24. What is the formula of the nitride ion? A) N 3- B) NO2 - C) NO3 3- D) NO3 2- E) NO ) The shape of the carbon tetrachloride, CCl 4, molecule is A) linear. B) square. C) pyramidal. D) tetrahedral. E) octagonal. 26. The carbon tetrachloride molecule, CCl 4, is A) a polar molecule with polar bonds.

7 B) a nonpolar molecule with polar bonds. C) a nonpolar molecule with nonpolar bonds. D) a polar molecule with nonpolar bonds. E) a polar molecule with ionic bonds ) Which of the following electron configurations is impossible? A) 1s 2 2s 2 2p 6 3s 2 3p 1 B) 1s 2 2 s 4 2p 6 3s 2 3p 3 C) 1s 2 2s 2 2p 6 3s 2 3 p 5 D) 1s 2 2s 2 2p 6 3s 2 3p 6 E) 1s 2 2s 2 2p 6 3s 2 3p What is the abbreviated electron configuration for nickel (atomic number 28)? A) [He]2s 2 2p 3 B) [Ar]4s 2 3d 8 C) [Kr]4s 2 3d 8 D) [Ar]4s 2 4p 4 E) [Ar]3d The correct name for the compound N 2 O 3 is A) nitrogen oxide. B) nitrogen trioxide. C) dinitride trioxide. D) dinitrogen oxide. E) dinitrogen trioxide ) The formula and name for a molecule formed from N and Cl would be A) NCl, nitrogen chloride B) NCl 2, nitrogen chloride C) NCl 3, nitrogen trichloride D) N 3 Cl, nitrogen chloride E) NCl 5, nitrogen pentachloride Answer: C

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