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1. A student prepares a 100 mL aq containing a small amount of (NH4)2SO4 and a second 100 mL solution containing a small amount of Nal, then mixes the two solutions. Which statement describes what happens? (A) Both compounds dissolve and remain in solution when the two solutions are mixed. (B) Both compounds dissolve initially but NHI precipitates when the solutions are mixed. (C) Both compounds dissolve initially but Na₂SO4 precipitates when the solutions are mixed. (D) The Nal dissolves but the (NH4)2SO4 does not. There is no change upon mixing.

1. A student prepares a 100 mL aq containing a small amount of (NH4)2SO4 and a second 100 mL solution containing a small amount of Nal, then mixes the two solutions. Which statement describes what happens? (A) Both compounds dissolve and remain in solution when the two solutions are mixed. (B) Both compounds dissolve initially but NHI precipitates when the solutions are mixed. (C) Both compounds dissolve initially but Na₂SO4 precipitates when the solutions are mixed. (D) The Nal dissolves but the (NH4)2SO4 does not. There is no change upon mixing.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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1. A student prepares a 100 mL aqueous solution containing a small amount of (NH4)2SO4 and a second 100 mL solution containing a small amount of Nal, then mixes the two solutions. Which statement describes what happens? (A) Both compounds dissolve and remain in solution when the two solutions are mixed. (B) Both compounds dissolve initially but NHI precipitates when the solutions are mixed. (C) Both compounds dissolve initially but Na₂SO4 precipitates when the solutions are mixed. (D) The Nal dissolves but the (NH4)2SO4 does not. There is no change upon mixing. 2. A colored gas is observed with which combination? (A) calcium hydride and water (B) lead metal and nitric acid (C) sodium carbonate and sulfuric acid (D) zinc sulfide and hydrochloric acid 3. Mixing which pair of 0.10 M solutions produces two precipitates that cannot be separated from one another by filtration? (A) aluminum chloride and copper(II) nitrate (B) strontium bromide and lead(II) acetate (C) magnesium perchlorate and lithium carbonate (D) barium hydroxide and copper(II) sulfate 4. Which gas turns limewater, a saturated solution of Ca(OH)2, cloudy? (A) H₂ (B) 0₂ (C) CO₂ (D) CH4 5. For aqueous solutions of which of the following substances could the concentration be determined by visible spectrophotometry? I Cr(NO3)3 II KMnO4 (A) I only (C) I and II only 101 III Zn(NO3)2 (B) III only (D) I, II, III 6. Four elements were tested in the laboratory and gave the results in the table below. Which element is a metalloid? Element Appearance Conductivity High A B C D (A) Element A (C) Element C (A) 0.050 M (C) 0.150 M Slight luster Shiny Dull Shiny Low (A) C₁3H4N7O12 (C) C₁5H10N6O11 None High (B) Element B (D) Element D 7. What is the molarity of Nations in a solution made by dissolving 4.20 g of NaHCO3 (M = 84.0) and 12.6 g of Na₂CO3 (M= 126) in water and diluting to 1.00 L? (B) 0.100 M (D) 0.250 M stion. Behavior with HCI Bubbles slowly No reaction No reaction Bubbles rapidly 8. Which solute has the greatest solubility (in mol/L) in water at 25 °C and 1 atm? (A) CH4 (B) NH, (C) AgCl (D) CaSO4 9. Which 2.00 M solution can be used to separate Al³+ from Fe³+ in an aqueous solution? 3+ (A) HCI (B) H₂SO4 (C) NaCl (D) NaOH 10. The percent composition of the high explosive HNS is C H N 0 37.35% 1.34% 18.67% 42.65% The molar mass of HNS is 450.22. What is the molecular formula of HNS? (B) C₁4H6N6012 (D) C₁6H₁2N5O11 (B) KOH (D) NH4NO3 11. A student prepares four 0.10 M solutions, each containing one of the solutes below. Which solution has the lowest freezing point? (A) CaCl₂ (C) NaC₂H₂O₂
Transcribed Image Text:1. A student prepares a 100 mL aqueous solution containing a small amount of (NH4)2SO4 and a second 100 mL solution containing a small amount of Nal, then mixes the two solutions. Which statement describes what happens? (A) Both compounds dissolve and remain in solution when the two solutions are mixed. (B) Both compounds dissolve initially but NHI precipitates when the solutions are mixed. (C) Both compounds dissolve initially but Na₂SO4 precipitates when the solutions are mixed. (D) The Nal dissolves but the (NH4)2SO4 does not. There is no change upon mixing. 2. A colored gas is observed with which combination? (A) calcium hydride and water (B) lead metal and nitric acid (C) sodium carbonate and sulfuric acid (D) zinc sulfide and hydrochloric acid 3. Mixing which pair of 0.10 M solutions produces two precipitates that cannot be separated from one another by filtration? (A) aluminum chloride and copper(II) nitrate (B) strontium bromide and lead(II) acetate (C) magnesium perchlorate and lithium carbonate (D) barium hydroxide and copper(II) sulfate 4. Which gas turns limewater, a saturated solution of Ca(OH)2, cloudy? (A) H₂ (B) 0₂ (C) CO₂ (D) CH4 5. For aqueous solutions of which of the following substances could the concentration be determined by visible spectrophotometry? I Cr(NO3)3 II KMnO4 (A) I only (C) I and II only 101 III Zn(NO3)2 (B) III only (D) I, II, III 6. Four elements were tested in the laboratory and gave the results in the table below. Which element is a metalloid? Element Appearance Conductivity High A B C D (A) Element A (C) Element C (A) 0.050 M (C) 0.150 M Slight luster Shiny Dull Shiny Low (A) C₁3H4N7O12 (C) C₁5H10N6O11 None High (B) Element B (D) Element D 7. What is the molarity of Nations in a solution made by dissolving 4.20 g of NaHCO3 (M = 84.0) and 12.6 g of Na₂CO3 (M= 126) in water and diluting to 1.00 L? (B) 0.100 M (D) 0.250 M stion. Behavior with HCI Bubbles slowly No reaction No reaction Bubbles rapidly 8. Which solute has the greatest solubility (in mol/L) in water at 25 °C and 1 atm? (A) CH4 (B) NH, (C) AgCl (D) CaSO4 9. Which 2.00 M solution can be used to separate Al³+ from Fe³+ in an aqueous solution? 3+ (A) HCI (B) H₂SO4 (C) NaCl (D) NaOH 10. The percent composition of the high explosive HNS is C H N 0 37.35% 1.34% 18.67% 42.65% The molar mass of HNS is 450.22. What is the molecular formula of HNS? (B) C₁4H6N6012 (D) C₁6H₁2N5O11 (B) KOH (D) NH4NO3 11. A student prepares four 0.10 M solutions, each containing one of the solutes below. Which solution has the lowest freezing point? (A) CaCl₂ (C) NaC₂H₂O₂
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