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51) Which of the following combination of dispersed phase in a dispersion medium with the colloid type is INCORRECT? A) Solid in liquid is a sol. B) Solid in solid is a solid sol. C) Solid in gas is an aerosol. D) Liquid in solid is a solid foam. E) Liquid in gas is an aerosol. 52) Choose the correct statement. A) Colloids are homogeneous solutions. B) A true colloidal particle will not settle out of the dispersing membrane. C) Colloidal particles can usually pass through a semipermeable membrane. D) Electrolytes are protective colloids. E) Dispersion is the method of preparing colloids from ions or molecules. 53) Choose the INCORRECT statement. A) Since colloidal particles are large aggregates of atoms they are electrically neutral. B) Colloidal suspensions can be prepared in which the particles do not settle. C) The addition of electrolytes to a colloidal suspension will sometimes cause the particles to coalesce and precipitate. D) Colloidal particles reflect light from a beam. E) Colloidal suspensions exhibit the Tyndall Effect. 54) Which of the following material-colloid type combinations is INCORRECT? A) mayonnaise – emulsion B) whipped cream – foam C) smoke – aerosol D) lava – solid foam E) opal – solid sol 55) Which of the following is an example of a colloid? A) sucrose in water B) whipped cream C) steel D) salt in water 56) A solution component present in lesser quantity than the solvent is called ________. A) a diluent B) an alloy C) a heterogeneous solid D) a solute E) a mixture 57) Moles of solute per mole of solution is a definition of ________. A) molarity B) mole fraction C) percent by weight D) molality E) normality 58) An aqueous solution contains 64.0 g of ethanol (C2H5OH) in 122.0 g of solution. What is the mole fraction of ethanol in the solution? A) 0.301 B) 0.432 C) 0.205 D) 0.698 E) 0.317 59) Moles of solute per liter of solution is the definition of ________. A) molality B) solubility C) molarity D) normality E) mole fraction 60) 85.0 grams of potassium bromide are to be used to produce a 0.300 M solution. What will be the total volume of this solution? A) 2.38 L B) 2.83 L C) 283 L D) 0.214 L E) 0.420 L

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