RTF Chapter 4 Questions Bank with 100% Correct Answers

RTF Chapter 4 Questions Bank with 100% Correct Answers 1. An unknown substance dissolves readily in water but not in benzene (a nonpolar solvent). Molecules of what type are present in the substance? A) neither polar nor nonpolar B) polar C) either polar or nonpolar D) nonpolar E) none of these - Answer️️ -B) polar 2. The interaction between solute particles and water molecules, which tends to cause a salt to fall apart in water, is called A) hydration B) polarization C) dispersion D) coagulation E) conductivity - Answer️️ -A) hydration 3. Consider two organic molecules, ethanol and benzene. One dissolves in water and the other does not. Why? A) They have different molar masses. B) One is ionic, the other is not. ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM 2 C) One is an electrolyte, the other is not. D) Ethanol contains a polar O-H bond, and benzene does not. E) Two of these are correct. - Answer️️ -D) Ethanol contains a polar O-H bond, and benzene does not. 4. Polar molecules have an unequal distribution of charge within the molecule. True or False? - Answer️️ -True 5. Which of the following is a strong acid? A) HF B) KOH C) HClO4 D) HClO E) HBrO - Answer️️ -C) HClO4 6. All of the following are weak acids except A) HCNO B) HBr C) HF D) HNO2 E) HCN - Answer️️ -B) HBr 7. Which of the following is not a strong base? ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM 3 A) Ca(OH)2 B) KOH C) NH3 D) LiOH E) Sr(OH)2 - Answer️️ -C) NH3 8. Which of the following is paired incorrectly? A) H2SO4 - strong acid B) HNO3 - weak acid C) Ba(OH)2 - strong base D) HCl - strong acid E) NH3 - weak base - Answer️️ -B) HNO3 - weak acid 9. The man who discovered the essential nature of acids through solution conductivity studies is A) Priestly B) Boyle C) Einstein D) Mendeleev E) Arrhenius - Answer️️ -E) Arrhenius ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM 4 10. A solid acid HX is mixed with water. Two possible solutions can be obtained. Which of the following is true? I. II. A) In case I, HX is acting like a weak acid, and in case II, HX is acting like a strong acid. B) In case I, HX is acting like a strong acid, and in case II, HX is acting like a weak acid. C) In both cases, HX is acting like a strong acid. D) In both cases, HX is acting like a weak acid. E) HX is not soluble in water. - Answer️️ -B) In case I, HX is acting like a strong acid, and in case II, HX is acting like a weak acid. 11. An acid is a substance that produces OH- ions in water. True or False? - Answer️️ -False 12. A 16.4-g sample of HF is dissolved in water to give 2.0 × 102 mL of solution. The concentration of the solution is: A) 0.82 M B) 0.16 M C) 0.08 M D) 4.1 M E) 8.2 M - Answer️️ -D) 4.1 M ©SOPHIABENNET@2024/2025 Tuesday, August 20, 2024 10:21 AM 5 13. 1.00 mL of a 3.50 × 10-4 M solution of oleic acid is diluted with 9.00 mL of petroleum ether, forming solution A. Then 2.00 mL of solution A is diluted with 8.00 mL of petroleum ether, forming solution B. What is the concentration of solution B? A) 3.50 × 10-6 M B) 9.72 × 10-6 M C) 7.00 × 10-5 M D) 7.78 × 10-5 M E) 7.00 × 10-6 M - Answer️️ -E) 7.00 × 10-6 M 14. 1.00 mL of a 4.05 × 10-4 M solution of oleic acid is diluted with 9.00 mL of petroleum ether, forming solution A. Then 2.00 mL of solution A is diluted with 8.00 mL of petroleum ether, forming solution B. How many grams of oleic acid are 5.00 mL of solution B? (Molar mass for oleic acid = 282 g/mol) A) 5.71 × 10-6 g B) 1.59 × 10-5 g C) 2.28 × 10-2 g D) 1.14 × 10-5 g