Name Period CH 180 Practice Test: Chapters 3 and 4

Transcription

1 Name Period CH 180 Practice Test: Chapters 3 and 4 Multiple Choice:

2 Directions: Answer all questions. Show work with units. All answers should represent the rules of significant measurement. Partial credit may be given on a case-by-case basis. All atomic weights should be rounded to the nearest tenth. Circle your final answer for each question. Good luck. 28. Hydrogen gas is a product in the following reaction: Ca (s) + 2 HCl (aq) CaCl2 (aq) + H2 (g) a) If g of solid calcium is placed in excess hydrochloric acid, how many moles of hydrogen gas should be produced if the reaction goes to completion? b) How many molecules of hydrogen gas does this represent? 29) A compound was found to contain 90.6% lead (Pb) and 9.4% oxygen. It s molar mass is g/mol. a. Calculate the empirical formula for this compound. b. What is the molecular formula? 2

3 30) Hydrogen sulfide is an impurity in natural gas that must be removed. One common removal method is called the Claus process, which relies on the reaction: 8 H2S (g) + 4 O2 (g) S8 (l) + 8 H2O (g) Under optimal conditions the Claus process gives 98% yield of S8 from H2S. a. If you started with 30.0 grams of H2S and 50.0 grams of O2, how many grams of S8 would be produced? b. How much excess reactant, in grams, would be remain unreacted? c. Which species undergoes oxidation in this reaction? 3

4 31) A solution is made by mixing 15.0 g of potassium bromide and ml of M silver acetate. The new solution also has a volume of ml a. Write a balanced equation for the reaction that occurs. b. Identify the limiting reactant. c. What are the spectator ions in this reaction? 32. You have solid barium fluoride and distilled water. Briefly describe the correct way to produce 500. ml of a 0.50 M concentrated solution of this salt. 4

5 Multiple Choice: 1) When the following equation is balanced, the coefficients are. A) 2, 3, 4, 4 B) 1, 4, 8, 9 C) 2, 12, 8, 9 D) 4, 4, 32, 36 E) 2, 25, 16, 18 C8H18 + O2 CO2 + H2O 2) Which one of the following substances is the product of this combination reaction? Al (s) + I 2 (s) A) AlI 2 B) AlI C) AlI 3 D) Al 2 I 3 E) Al 3 I 2 3) The formula weight of lead (II) carbonate (PbCO3) is amu. A) B) C) D) E) ) The mass % of F in the binary compound KrF 2 is. A) B) C) D) E)

6 5) How many atoms of nitrogen are in 10 g of NH4NO3? A) 3.5 B) C) D) 1.8 E) 2 6) A 22.5-g sample of ammonium carbonate contains mol of ammonium ions. A) B) C) D) 2.14 E) ) Sulfur and oxygen react to produce sulfur trioxide. In a particular experiment, 7.9 grams of SO3 are produced by the reaction of 5.0 grams of O2 with 6.0 grams of S. What is the % yield of SO3 in this experiment? A) 32 B) 63 C) 75 D) 95 E) 99 S (s) + O2 (g) SO3 (g) (not balanced) 8) Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia: N 2 (g) + 3 H 2 (g) 2NH 3 (g) A g sample of N 2 requires 3.0 g of H 2 for complete reaction. A) 0.51 B) 0.76 C) 1.2 D) 14.0 E)

7 9) One mole of contains the smallest number of atoms. A) S 8 B) C 10 H 8 C) Al 2 (SO 4 ) 3 D) Na 3 PO 4 E) NaCl 10) How many carbon atoms are there in g of carbon dioxide? A) B) C) D) E) ) What is the empirical formula of a compound that contains 27.0% S, 13.4% O, and 59.6% Cl by mass? A) SOCl B) SOCl 2 C) S 2 OCl D) SO 2 Cl E) ClSO 4 12) Which ion(s) is/are spectator ions in the formation of a precipitate of AgCl via combining aqueous solutions of CoCl 2 and AgNO 3? A) Co 2+ and NO 3 - B) NO 3 - and Cl - C) Co 2+ and Ag + D) Cl - E) NO 3-7

8 13) Which combination will produce a precipitate? A) NH4OH (aq) and HCl (aq) B) AgNO 3 (aq) and Ca(C2H3O2)2 (aq) C) NaOH (aq) and HCl (aq) D) NaCl (aq) and H C2H3O2 (aq) E) NaOH (aq) and Fe(NO 3 )2 (aq) 14) The reaction between strontium hydroxide and chloric acid produces. A) a molecular compound and a weak electrolyte B) two weak electrolytes C) two strong electrolytes D) a molecular compound and a strong electrolyte E) two molecular compounds 15) Which of these metals will be oxidized by the ions of cobalt? A) nickel B) tin C) iron D) copper E) silver 16) What is the concentration (M) of CH3OH in a solution prepared by dissolving 11.7 g of CH3OH in sufficient water to give exactly 230 ml of solution? A) 11.9 B) C) D) 1.59 E) ) What are the respective concentrations (M) of Fe 3+ and I - afforded by dissolving mol FeI 3 in water and diluting to 725 ml? A) and B) and C) and D) and E) and

9 18) Which one of the following is not true concerning 2.00 L of M solution of Ca 3 (PO 4 ) 2? A) This solution contains mol of Ca 3 (PO 4 ) 2. B) This solution contains mol of oxygen atoms. C) 1.00 L of this solution is required to furnish mol of Ca 2+ ions. D) There are phosphorus atoms in ml of this solution. E) This solution contains mol of Ca ) What volume (ml) of a concentrated solution of sodium hydroxide (6.00 M) must be diluted to ml to make a M solution of sodium hydroxide? A) 2.64 B) 176 C) 26.4 D) 29.3 E) ) Which solution has the same number of moles of NaOH as ml of 0.100M solution of NaOH? A) ml of 0.200M solution of NaOH B) ml of 0.175M solution of NaOH C) ml of 0.145M solution of NaOH D) ml of 0.125M solution of NaOH E) ml of M solution of NaOH 21) The molarity (M) of an aqueous solution containing 22.5 g of sucrose (C 12 H 22 O 11 ) in 35.5 ml of solution is. A) B) C) 1.85 D) 3.52 E) ) Which one of the following is a triprotic acid? A) nitric acid B) chloric acid C) phosphoric acid D) hydrofluoric acid E) sulfuric acid 9

10 23) In which species does nitrogen have the highest oxidation number? A) N2 B) NH3 C) HNO2 D) NO2 - E) NaNO3 24) Based on the activity series, which one of the reactions below will occur? A) Zn (s) + MnI 2 (aq) ZnI 2 (aq) + Mn (s) B) SnCl 2 (aq) + Cu (s) Sn (s) + CuCl 2 (aq) C) 2AgNO 3 (aq) + Pb (s) 2Ag (s) + Pb(NO 3 ) 2 (aq) D) 3Hg (l) + 2Cr(NO 3 ) 3 (aq) 3Hg(NO 3 ) 2 + 2Cr (s) E) 3FeBr 2 (aq) + 2Au (s) 3Fe (s) + 2AuBr 3 (aq) 25) Oxidation is the and reduction is the. A) gain of oxygen, loss of electrons B) loss of oxygen, gain of electrons C) loss of electrons, gain of electrons D) gain of oxygen, loss of mass E) gain of electrons, loss of electrons 26) In which reaction does the oxidation number of hydrogen change? A) HCl (aq) + NaOH (aq) NaCl (aq) + H 2 O (l) B) 2 Na (s) + 2 H 2 O (l) 2 NaOH (aq) + H 2 (g) C) CaO (s) + H 2 O (l) Ca(OH) 2 (s) D) 2 HClO 4 (aq) + CaCO 3 (s) Ca(ClO 4 ) 2 (aq) + H2 O (l) + CO 2 (g) E) SO 2 (g) + H 2 O (l) H 2 SO 3 (aq) 27) Which of the following would require the largest volume of M sodium hydroxide solution for neutralization? A) 10.0 ml of M phosphoric acid B) 20.0 ml of M nitric acid C) 5.0 ml of M sulfuric acid D) 15.0 ml of M hydrobromic acid E) 10.0 ml of M perchloric acid 10