Question

18. Diluting 1.0 mL of a 1.0 M solution to 1000 mL results in a solution that is 0.001 M. Repeating this 1000-fold dilution process five more times results in a concentration of A. 1.0 x 10-8 M B. 5.0 x 10-'M C. 1.0 x 10-18 M D. 1.0 x 10-12 M E. 2.0 x 10+M 19. Which of the following statements is true regarding electrolytes and nonelectrolytes? A. Molten ionic compounds are usually considered to be weak electrolytes. B. Because graphite is a good conductor of electricity, it is considered to be a strong electrolyte. C. All molecular compounds dissolved in water behave as nonelectrolytes. D. Ionic compounds that dissolve in water contain mobile ions and are strong electrolytes. E. All acids ionize completely when they dissolve in water. 20. Which contains more solute particles: a 0.10 M aqueous solution of methanol (CH3OH) or a 0.10 M aqueous solution of salt (NaCl)? A. They contain the same number of solute particles. B. The salt solution contains twice as many particles as the methanol solution. C. The methanol solution contains three times as many particles as the salt solution. D. The salt solution contains three times as many particles as the methanol solution. E. The methanol solution contains twice as many particles as the salt solution. 21. How many grams of solid potassium chlorate (KCIO3, 122.55 g/mol) are needed to make 150 mL of 0.50 M solution? 22. A salt solution is added to a marine aquarium. What mass of sodium chloride (NaCl, 58.44 g/mol) is needed to produce 250.0 mL of a solution that has a concentration of 50.0 mM?

Answer 1

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