Dr. Rick Fletcher. Exam 2 Chemistry 101 March 7, Clearly print your name in the name section of the Scantron answer sheet.

Transcription

1 Name: Dr. Rick Fletcher Exam 2 Chemistry 101 March 7, 2012 Clearly print your name in the name section of the Scantron answer sheet. Clearly place your student ID number in the SUBJECT section of the Scantron sheet. Maintain appropriate security over your exam. Do not let others see your answers. There is only one most correct response to each of the multiple choice questions. Choose the best answer. Each of the twenty-five questions is worth 4 points. Since the Scantron sheets will not be returned to you, please work through the entire exam and circle the best answer on this exam. Mark this exam as you work the problems then transfer the responses to the Scantron sheet all at one time. This is the best way to reduce errors. Use pencil on the Scantron sheets and make certain to fully erase any changes you make. Use this exam to check your answers on the key that will be posted online cm = 1 in 454 g = 1 lb 946 ml = 1 qt 5280 ft = 1 mile 16 oz = 1 lb 4 qt = 1 gal heat = (sp. Ht.) X (mass) X ( Temp) T (K) = T ( C) T( F) = (1.8 X T( C)) cal = J

2 1. Having one mole of carbon dioxide means that you have A) 6.022x10 23 molecules of CO 2 B) 6.022x10 23 moles of carbon C) 1 molecule of CO 2 D) 6.022x10 23 atoms of oxygen 2. Which one of the following single replacement equations will result in a reaction? A) Ag(s) + PbCl 2 (aq) B) Au(s) + CuCl 2 (aq) C) Fe(s) + ZnCl 2 (aq) D) Sn(s) + CuCl 2 (aq) 3. What is the mass of moles of Na 2 SO 4? A) g B) g C) g D) 4.41x10 4 g 4. A sample of plutonium is known to contain 4.5x10 18 atoms. How many moles of plutonium are present? A) 9.30x10-22 moles B) 1.34x10 5 moles C) 7.47x10-6 moles D) 1.08x10 21 moles 5. How many elements are in the 2 nd period of the periodic table? A) 8 B) 6 C) 2 D) Group VIIA are a family of elements best known as A) diatomics. B) noble gases. C) nonmetals. D) halogens.

3 7. Given the following reaction, identify the spectator ions. Pb(ClO 4 ) 2 + 2NaBr PbBr 2 + 2NaClO 4 A) 1- Pb and ClO 4 B) not enough information C) Pb 2+ and Br 1- D) Na + 1- and ClO 4 8. A bottle in lab is filled with a liquid and is labeled as Na 2 CO 3 (aq). Based on this information, what is present in solution? A) Na 1+, CO 2-3, water B) Na 1+ 2, CO 2-3, water C) Na, CO 3, H 2 O D) Na, C, and O 9. Solid aluminum reacts with gaseous oxygen to form solid aluminum oxide. Which one of the following equations accurately represents this chemical reaction? A) 2Al(s) + O 3 (g) Al 2 O 3 (s) B) Al + O AlO C) Al(s) + O 2 (g) Al 2 O 3 (s) D) 4Al(s) + 3O 2 (g) 2Al 2 O 3 (s) 10. Determine the charge on the copper ion in the compound Cu 2 O 3. A) +3 B) 3 C) +2 D) What is the charge of phosphide ions? A) 5 B) 3 C) +5 D) The chemical name for laughing gas, which can be used as an anesthetic, is dinitrogen monoxide. The chemical formula for laughing gas is A) ON 2. B) NO 2. C) NO. D) N 2 O.

4 13. What is the mass of 4.3 moles of Se? A) 18 g B) 2.6 x g C) 7.1 x g D) 340 g 14. What is the chemical name for CuO? A) copper monoxide B) copper (I) oxide C) copper oxide D) copper (II) oxide 15. A sample of N 2 O 5 is known to contain 4.3x10 24 molecules. How many nitrogen atoms are in this sample? A) 4.3x10 48 atoms B) 2.2x10 25 atoms C) 8.6x10 24 atoms D) 4.3x10 24 atoms 16. The alkaline earth metals are found in A) Group IIB B) Group IA C) Group IB D) Group IIA 17. Which of the following is not a match? A) CrO 2-4, chromate ion B) PO 2-4, phosphite ion C) ClO 1-3, chlorate ion D) OH 1-, hydroxide ion 18. How many moles are in 23.0 g of Na? A) moles B) 1.0 moles C) x moles D) 23.0 moles

5 19. Naphthalene(C 10 H 8 ), better known as mothballs, undergoes a combustion reaction with oxygen to form carbon monoxide and water. What is the coefficient in front of oxygen? A) 3 B) 7 C) 10 D) Having one mole of carbon dioxide means that you have A) 6.022x10 23 atoms of oxygen B) 1 molecule of CO 2 C) 6.022x10 23 moles of carbon D) 1 mole of carbon atoms 21. At room temperature, which one of the following exists in the liquid state? A) Cl 2 B) S 8 C) Cd D) Hg 22. What is the formula weight for iron(iii) oxide? A) amu B) amu C) amu D) amu 23. Aqueous solutions of cesium chlorate and iron(ii) nitrate are poured together and allowed to react. What is the identity of the precipitate, if one is produced? A) This reaction does not produce a precipitate. B) Fe(NO 3 ) 2 C) CsNO 3 D) Fe(ClO) Which one of the following represents a combustion reaction? A) 2KClO 3 (s) 2KCl(s) + 3O 2 (g) B) Cr(s) + O 2 (g) Cr 2 O 3 (s) C) C 2 H 4 (g) + H 2 (g) C 2 H 6 (g) D) Fe(NO 3 ) 2 (aq) + Na 2 S(aq) FeS(s) + 2NaNO 3 (aq)

6 25. Aqueous solutions of iron(ii) chloride and sodium hydroxide are poured together and allowed to react. What is the identity of the precipitate, if one is produced? A) NaCl B) FeOH C) Iron(II) hydroxide D) none of the above 26. Please indicate you are taking Version A of this exam by marking the A response on QUESTION 26 ON THE REVERSE SIDE OF THE SCANTRON SHEET. Failure to do this will invalidate your responses.