39. Which statement about the process of dissolving is TRUE? A. Dissolving releases energy in the form of heat. B. Solvent can be dissolved faster when stirring is applied. C. Applying heat often speeds up the process of dissolving particles. D. Once a solute, such as salt crystal is dissolved in a solvent such as water, it can never return to its original crystal state, 40. Why does sugar have higher solubility in hot water as compared to salt? A. The temperature of water limits the solubility of salt . B. Sugar has smaller particle size compared to salt crystals. C. Sugar and salt differ in nature that affects their solubility. D. The temperature of water does not affect the rate of solubility of salt. 41. Which of the following conditions will make sugar dissolve more rapidly? A. Sugar cubes in cold water C. Powdered sugar in cold water B. Sugar cubes in hot water D. Powdered sugar in hot water 42. How does grinding affect the solubility of solute and solvent? A. Grinding speeds up the stirring process to dissolve the substance. B. The size of the particles changes the nature of the solute in the solution. C. As the size of the particles decreases, the solubility rate also increases due to increasing surface area. D. Bigger particles are readily surrounded by solvent particles making them easier to dissociate in the solution. 43. The of a solution is the measure of the amount of solute that has been dissolved in each amount of solvent. A. concentration C. rate of dissolution B. volume D. mass more solute to an 44. To make a solution more concentrated, you need to amount of solvent. A. add C. subtract B. heat D. reduce is used to describe solutions where both the solute and the 45. Percent by solvent are liquids. A. Amount B. Concentration C. Mass D. Volume 46. What is the percentage by mass of a 15g of sugar dissolved in a 45g of water? A. 3% C. 25% B. 33% D. 75% 47. What is the percentage by volume of 24mL of isopropyl alcohol in a volume of 144mL solution? A 6% C. 17% B. 14% D. 60% 48. What is the percentage by mass of sodium hydrogen carbonate that has 20 grams of solute in 600mL of water? A. 3.33% C. 3.45% B. 3.20% D. 3.23%


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