Select one answer for each question. For each question, the response write the rationale for selection as supportive. In a dynamic Brownian movement of particles in a sample solution, which of the following factor will fundamentally apply? A.Larger particles will move slower only in the beginning of the process, due to the presence of the smaller particles in the environment. B.Smaller particles will move rapidly based upon their own mass, and under the influence of solvent molecules. C.Both larger and smaller particles move at the same speed motion.

21. Solute particles influence the properties of a solution. What is NOT assumed when understanding colligative properties? A. lons do not interact with each other upon dissolution B. lons undergo complete dissolution in an ideal solution C. lons behave like ideal gas particles in an ideal solution D. lons react with solvent particles, altering their properties 22. When mercuric iodide is added to the aqueous solution of potassium iodide, the A. freezing point is raised B. freezing point is lowered C. boiling point does not change D. freezing point does not change 23. An aqueous solution of methanol in water has a vapor pressure that is A. equal to that of methanol B. more than that of water C. less than that of water D. equal to that of water 24. Which of the following molecules has an assumed van't Hoff factor equal to 2? A. KPO4 B. M9SO4 C. NaHSO4 D. CoH1206 25. When CH3OH is dissolved in water, how many particles are in the solution? A. 1 B. 3 C. 5 D. 6 26. Adding a nonvolatile…

Celery stalks that are immersed in fresh water for several hours become stiff. Similar stalks left in a 0.15 M salt solution become limp. From this we can deduce that the fresh water______.

39. When a solution is diluted by the addition of solvent, which quantity does not change? a. the molarity of the solution b. the number of moles of solvent c. the mass percent of the solution O d. the number of moles of the solute 40. Given the reaction: A + B→ C + D, the reaction will most likely occur at the greatest rate if A and B represent * a, nonpolar molecular compounds in the solid phase b. ionic compounds in the solid phase c. solutions of nonpolar molecular compound d solution of ionic compounds

Consider four distinct physical properties: boiling point, melting point, solubility, and density. which of these physical properties do you think allows extraction to work? and why?

The solubility of KNO3 (in gr KNO3 per 100 gr water) is 155 gr KNO3 at 75 oC and 38 gr KNO3 at 25 oC. What mass of KNO3 (in grams) will crystallize out of solution if exactly 100 gr of its saturated solution at 75 oC are cooled to 25 oC?       a. 75.4 gr   b. 30.7 gr c. 110 gr  d. 45.9 gr

46.29 g of KOH is dissolved in 250. mL of water. (Please pay attention to sig figs!) What is the mass percent of KOH in this solution? (use the density of water 1.00g/mL) a. b. What is the concentration, expressed in molal (m = moles solute/kg solvent), of this initial solution? What is the concentration, expressed in molar (M = moles solute/liters solvent), of this initial solution? (assume that the addition of the KOH to the water did not change the C. volume, which is still 250.mL) d. If I add 500.mL of pure water to this 250.mL solution, what is the new concentration expressed in molar (M)? (Careful, what is the new volume after mixing?) e. If, instead, I took the 250. mL solution and evaporated the water until the solution had a volume of 150.mL, what would be the concentration of this this new solution expressed in molar (M)?

You were tasked to separate the components of a mixture containing silica, sodium chloride and charcoal. TNāCI dissolves in water while silica and charcoal are not water-soluble. Only charcoal dissolves in carbon disulfide. a. Write a short experimental procedure to carry out the separation of the mixture. b. Given the following data, determine the percentage of charcoal, sodium chloride and silica. Mass (g) Mass of beaker 100.000 Mass of beaker + mixture 110.000 mass of evaporating dish 62.000 mass of evaporating dish + solid after evaporation of water 65.000 Mass of beaker + charcoal + silica after evaporation of excess water 117.000 mass of beaker + silica after decanting dissolved charcoal and drying 113.545

11. You have a solution that is 18.2% sodium thiosulfate, Na2S2O3 , by mass. a. What mass of sodium thiosulfate is in 75.0 g of solution? b. How many moles of sodium thiosulfate are in 75.0 g of solution? please show work

Explain the difference between a. a colloidal and a crystalline precipitate b. precipitation and coprecipitation c. peptization and coagulation of a colloid d. occlusion and mixed-crystal formation e. nucleation and particle growth