Chem101_SampleTest2_KEY

Chem101_SampleTest2_KEY - Chemistry 101-2 Fall 2007 Sample...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry 101-2 Fall 2007 Sample Test No. 2 I (60 POINTS). Multiple Choice. Encircle the letter of the best answer. NOTE: In the actual exam, there will be 20 questions each worth 3 points. 1) A strong electrolyte is one that __________ completely in solution. A) reacts B) decomposes C) disappears D) ionizes A strong electrolyte exists in solution completely as ions. 2) Which of the following are weak electrolytes? 1) HCl strong electrolyte (Tables 4.2 and 4.3) 2) 2 3 2 HC H O weak electrolyte (Table 4.3) 3) 3 NH weak electrolyte (Table 4.3) 4) KCl strong electrolyte KCl a soluble ionic compound A) HCl, KCl B) HCl, 2 3 2 HC H O , 3 NH , KCl C) 2 3 2 HC H O , KCl D) 2 3 2 HC H O , 3 NH E) HCl, 2 3 2 HC H O , KCl 3) Combining aqueous solutions of 2 BaI and 2 4 Na SO affords a precipitate of 4 BaSO . Which ion(s) is/are spectator ions in the reaction? A) 2+ Ba only B) + Na only C) 2+ Ba and 2- 4 SO D) + Na and - I E) 2- 4 SO and - I The net ionic equation is the formation of the precipitate: Ba 2+ + SO 4 2- BaSO 4 The ions not found in the net ionic equation are the spectator ions. These are Na + and - I . 4) The balanced net ionic equation for precipitation of 3 CaCO when aqueous solutions of 2 3 Na CO and 2 CaCl are mixed is __________. A) + 2- 3 2 3 2Na (aq) + CO (aq) Na CO (aq) h B) + - 2Na (aq) + 2Cl (aq) 2NaCl (aq) h C) + - Na (aq) + Cl (aq) NaCl (aq) h D) 2+ 2- 3 3 Ca (aq) + CO (aq) CaCO (s) h E) 2 3 2 3 Na CO (aq) + CaCl (aq) 2NaCl (aq) + CaCO (s) h The reactions in problems 3 and 4 are metathesis reactions – reactants exchange partners. The net ionic reaction in a precipitation reaction is the formation of the precipitate: 2+ 2- 3 3 Ca (aq) + CO (aq) CaCO (s) h 5) Which hydroxides are strong bases? To answer this question correctly, you need to MEMORIZE Table 4.2! 2 Sr(OH) strong KOH strong NaOH strong 2 Ba(OH) strong A) KOH, 2 Ba(OH) 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
B) KOH, NaOH C) KOH, NaOH, 2 Ba(OH) D) 2 Sr(OH) , KOH, NaOH, 2 Ba(OH) E) None of these is a strong base. 6) You are given two clear solutions of the same unknown monoprotic acid, but with different concentrations. Which statement is true? A) There is no chemical method designed to tell the two solutions apart. FALSE B) It would take more base solution (per milliliter of the unknown solution) to neutralize the more concentrated solution. TRUE C) A smaller ( should be HIGHER ) volume of the less concentrated solution contains the same number of moles of the acid compared to the more concentrated solution. FALSE D) If the same volume of each sample was taken, then more ( should be less ) base solution would be required to neutralize the one with lower concentration. FALSE E) The product of concentration and volume of the less concentrated solution equals the product of concentration and volume of the more concentrated solution. FALSE 7) A neutralization reaction between an acid and a metal hydroxide produces __________. A
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

Chem101_SampleTest2_KEY - Chemistry 101-2 Fall 2007 Sample...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online