5. ch one of the statements below is false concerning the following reaction: NH

Question

5. ch one of the statements below is false concerning the following reaction: NH3(g) Hao(e) NH4 (aq) OH (aq) a. The double arrows indicate that ammonia, NH3, is only very slightly soluble in water. b. Ammonia partially reacts with water. c. When NH3 is added to H20,NHe and oH- ions are produced in a 1:1 ratio. d. When solutions of and oH are mixed, some ammonia is produced. NH4* e. The reaction is reversible. 6. Which of the following statements is/are CORRECT? 1. A solution is a homogeneous mixture of two or more substances. 2. A solute is a mixture of a solvent and a soluble compound. 3. Aqueous solutions are solutions in which water is a solvent. a. 1 only b 2 only c. 3 only d, 1 and 2 1 and 3 7. Which one of the following compounds is dissolved in water? a nonelectrolyte when NaCH3Co2 d. Cacl2 Cu(NO3 8. A precipitate is expected when an aqueous solution ofpotassium iodide is added to an aqueous solution a. barium hydroxide. b. calcium nitrate. c )lead perchlorate. d. iron(IT chloride. e, sodium sulfate. 9. Which of the following compounds is soluble in water? a. Na2S b, FeS c, NiS d. Mn2S3 e. Hg212 10. All of the following compounds are insoluble in water except e. PbF2 b. Fe(OH 3 a. Ni(CIO4 11. Which of following reactions best describes the dissolution of solid NaoH(s in water? the a. NaoH(s)+ H200) ONao (ang) H30 (ag) No OH (s) Na o

Explanation / Answer

5. a is incorrect

6. e

7. a

8. c

9.a

10.d

11.d (NaOH dissociate completely in water to give Na+ and OH- ions)

12. a. [ it will form AgCl which is insoluble in water]

13. a [ valency of Mg is 2 and PO4 is 3 so it will form Mg3(PO4)2 ]

14. b

15. d [ 1 mole of P4S3 will produce = 1mole of SO2

molar mass of P4S3 = 31 x 4 + 32 x 3 = 220; molar mass of SO2 = 32 + 16 x 2 = 64

220 g P4S3 will produce = 64 g of SO2

0.401g P4S3 will produce = 64 x .401/220 = .117 g ]

16. e SiO2 is the limiting reagent

[ mole of Ca3(PO4)2 = 1500 g/310 g/mol = 4.84 mol per reation = 4.84/1 = 4.84 mol

mol of SiO2 = 300/60.1 = 4.99 mol per reaction = 4.99/3 = 1.66 mol

mole of C = 304/12 = 25.33 per reaction = 25.33/5 = 5.06 mol

mole of O2 = 1150/32 = 35.93 per reaction = 35.93/5 =7.18 mol

mole of H2O = 300/18 = 16.67 per reaction = 16.67/3 = 5.56 mol ]

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