1) When working with solutions, there are several ways of expressing concentration of the amount of solute in the solvent. Which of the following common unit of concentration defined as the number of moles of a solute in one liter of solution? a) Molality (m) b) Molarity (M) c) Mole fraction d) Mole ratio 2) It comes from the Greek words stoikheion, which means element and metron which means to measure. a) Stoicism b) Statistician c) Stiochiometry d) None of the above 3) What is a coefficient in a balanced chemical equation? a) The number used to determine the relative amount of molecules, formula units, or moles of compounds in the reaction b) The number written before a substance to determine the number of mass that are present in the solution c) This is an entity that denote the proportion before and after of a certain reaction d) This is a number that varies on the conditions that affect reaction rate such as temperature, pressure, surface area and others 4) What do you call that amount of solute that is being dissolved in certain amount of solution? a) addition of solution b) concentration of solution c) aqueous solution d) combination of solute and solvent 5) When supposed you have the number of moles of a reactant or product in a reaction and you want to calculate for the mass of another product or reactant, what will you going to follow ? a) Mass to mole b) Mole to mole c) Mass to mass d) Mole to mass 6) A saline solution with a mass of 355 g has 36.5 g of NaCl dissolved in it. What is the mass/mass percent concentration of the solution? a) 10.28% (m/m) b) 12.18% (m/m) c) 10.18% (m/m) d) 12.28% (m/m) 7) In a solution, there is 111.0 mL (110.605 g) solvent and 5.24 mL (6.0508 g) solute present in a solution. Find its mass per volume. a) 6.205% b) 5.205% c) 4.205% d) 7.205% 8) 100.0 mL of 2.500 M KBr solution is on hand. You need 0.5500 M. What is the final volume of solution which results? (2.500 mol/L) (100.0 mL) = (0.5500 mol/L) (x) a) 545.4 mL b) 445.4 mL c) 455.5 mL d) 454.5 mL 9) If a solution is made by adding 40 mL of ethanol to 240 mL of water, what is its percent volume? a) 15.7% b) 17.6% c) 16.7 % d) 18.6% 10) Isopropyl alcohol has a density of 0.785 g/mL at 25 degree celcius. How much mass is cointained in 250 mL sample oh this alcohol? a) 196.25 g b) 186.25 g c) 176.25 g d) 166.25 g

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