Exam Chem103F06 2A Name __________________________________ (20 pts)Place the correct answer in the space at the left. 1. What is the best name for: CH3 CH2 CH3 C CH2 A) B) C) D) E) heptane 2 methyl 2 ethylbutane 3,3 dimethylpentane 2,2 diethylpropane 3 ethyl 3 methylbutane CH2 CH3 C H A) hexyne B) 2 ethyl 3 butyne C) 3 ethyl 1 butyne D) 3 methyl 1 pentyne E) 3 methyl 4 pentyne F) 4 methyl 2 hexyne 3. Hydrocarbons containing a carbon carbon triple bond are called? A) alkynes B) alkenes C) cycloalkanes D) aldehydes E) alkanes CH3 C C H CH3 CH3 Section _______________________
2. What is the best name for:
4. Which of the following contains a double C O bond and a single C O bond? A) ketone B) ester C) alcohol D) amine E) aldehyde
5. What is the common name for acetylsalicylic acid? A) orange juice B) aspirin C) acetone D) bananas E) vinegar
6. Which of the following can NOT be a cycloalkane? A) C3H6 B) C6H12 C) C8H16 D) C2H4 E) C4H8
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Name ________________________________ 7. What is another name for the molecule phenylamine? A) toluene B) phenol C) nitrobenzene D) aniline E) ethylbenzene
8. Which of the following functional groups does NOT contain a double bonded oxygen? A) carboxylic acid B) ketone D) amide C) aldehyde E) all contain a double bond
9. A 20.0 g sample of HF is dissolved in water to give 2.0 x 10 2 mL of solution. What is the HF concentration of the solution? A) 1.0 M B) 3.0 M C) 0,10 M D) 5.0 M E) 10. M
10. Which of the following aqueous solutions contains the largest number of moles of ions? A) B) C) D) E) 400.0 mL of 0.10 M NaCl 300.0 mL of 0.10 M CaCl2 200.0 mL of 0.10 M FeCl3 200.0 mL of 0.10 M KBr 800.0 mL of 0.10 M sucrose
11. What volume of 18.0 M sulfuric acid must be used to prepare 1.55 L of 0.195 M H2SO4? A) 16.8 mL B) 0.0336 L C) 9.23 mL D) 22.6 mL E) 9.32 mL
12. Which of the following is a strong acid? A) HF B) KOH C) HClO4 D) HClO E) HBrO
13. Which of the following salts is insoluble in water? A) Na2S B) K3PO4 C) Pb(NO3)2 D) CaCl2 E) All are soluble
14. Which of the following ions is most likely to form an insoluble sulfate? A) potassium ion B) lithium ion D) plumbous ion C) ammonium ion E) magnesium ion
15. In which of the following does nitrogen have an oxidation state of +4? A) HNO3 B) NO2 C) N2O D) NH4Cl E) NaNO2
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Name ________________________________ 16. According to the Bronsted Lowry definition, a base is: A) a substance that increases the hydroxide ion concentration in water B) a substance that can donate an electron pair to the formation of a covalent bond C) a substance that increases the anion formed by the autoionization of the solvent D) a substance that can accept a proton E) a substance that can donate a proton 17. Which of the following is NOT a conjugate pair? A) HCO3- / CO3-2 B) H3O+ / H2O C) OH- / O-2 D) H3PO4/ HPO4-2 E) NH2OH2+ / NH2OH 18. Each of the following can act as either a Bronsted acid or base except? A) HSB) HCO3C) H2O D) NH3 E) H3PO4
19. What is the mole fraction of benzene in a benzene chloroform solution that is 17.5 mole percent chloroform? A) 0.175 B) 0.212 C) 0.250 D) 0.650 E) 0.825
20. A solution contains AgNO3 and Cu(NO3)2, which of the following can be added to the solution to remove the silver ion but not the copper ion? A) sodium acetate B) potassium chloride C) potassium perchlorate D) sodium sulfate E) potassium nitrate II(15 pts) Draw the structure for: A) 4 chloro 2,5 dimethyl 3 - heptanone
B) i propylpentanoate
C) 2,4,6 trinitrotoluene
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Name ________________________________ III(13 pts) 265 mL of 1.20 M lead(II)nitrate was mixed with 305 mL of 1.90 M potassium iodide. A)(3) Write the net ionic equation for the reaction.
SHOW WORK
B)(5) How moles many of lead(II)iodide are formed?
Answer________________________ C)(5) What is the concentration of K+ in the mixture?
Answer________________________ IV(6 pts) A 5.00 g sample of an unknown metal chloride is completely soluble in water. 70.90 mL of 0.2010 M AgNO3 completely precipitates all of the chloride ion. What is the percentage chloride in the original sample? SHOW WORK
Answer________________________ V(6 pts) 235 mL of 1.20 M potassium phosphate was mixed with 265 mL of 2.00 M potassium chloride. What is the concentration of potassium ion in the mixture?
SHOW WORK Answer________________________
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Name ________________________________ VI(6 pts) For the following reaction, identify the conjugate acid base pairs. Specify which is the acid and which is the base in each pair. HSO3- + CN- HCN + SO3-2
VII(4 pts) Calcium hydroxide is dissolved in water until the pH of the solution is 10.94. What is the [OH-] of the solution? SHOW WORK Answer________________________ VIII(5 pts) How many moles of benzoic acid, a monoprotic acid with Ka = 6.4 x 10-5 , must be dissolved in 500.0 mL of water to produce a solution with a pH = 2.50?
SHOW WORK Answer________________________ IX(4 pts) A 0.60 M solution of a weak acid (Ka= 1.7 x 10 -8) has a pH of 4.0. What percent of the acid has ionized? SHOW WORK Answer________________________ X(5 pts) A solution of hydrogen peroxide is 30.0% H2O2 by mass and has a density of 1.11 g/ mL. what is the molality of the solution? SHOW WORK Answer________________________
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Name ________________________________ XI(6 pts) When the reaction : Zn + NO3- Zn(OH)4-2 + NH3 is balanced in base:
SHOW WORK
A) Water appears on the ______________ and has a coefficient of _____________ B) The number of moles of electrons changed in the reaction is _________________ C) The reducing agent is____________________ XII(5 pts) How many mL of 0.356 M barium hydroxide are needed to completely neutralized 58.0 mL of 0.427 M acetic acid? SHOW WORK
Answer________________________ XIII(5 pts) Determine if each of the following salts is acidic, basic, or neutral. Ka : CH3COOH = 1.8 x 10-5 ; HNO2 = 7.1 x 10-4 ; HClO2 = 1.1 x 10-2; HClO = 2.9 x 10-8 Kb : NH3 = 1.8 x 10-5 ; (CH3)2NH = 8.6 x 10-4; (CH3)NH2 = 4.4 x 10-4 A) ammonium perchlorate B) barium chloride C) cesium acetate ____________________ ____________________ ____________________
D) dimethylammonium nitrate ____________________ E) ammonium chlorite ____________________
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Name ________________________________ XIV(12 pts) Use the following code to indicate which functions and bonding the following molecules contain: molecules may contain more than one. A) alkane G) ether L) amide B) alkene C) alkyne H) aldehyde I) ketone M) secondary amine D) cycloalkane J) carboxylic acid N) tertiary amine E) alcohol F) ester K)primary amine
1) CH3CH2CH2CH3 2) CH3CH2CH2COOH 3) acetone 4) CH3CHCHCHO 5) (CH3CH2)(CH3)2N 6) formaldehyde 7) HOCH2CCCH2COOCH2CH3
________________________ ________________________ ________________________ ________________________ ________________________ ________________________ ________________________
XV(8 pts) Use the following portion of the activity series to complete the following reactions. All reactants are in aqueous solutions. Activity Series Li Ba Ca Na Al Zn Cr Fe Sn Pb H2 Cu Ag Au Reactions 1) Zn + HCl 2) Cu + HNO3 3) Al + Ag2S 4) Fe + LiCl ________________________ ________________________ ________________________ ________________________
5) Na + Sn(NO3)2 ________________________
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