A) MgCl2 B) C12H22O11 C) KCl D) NaOH
A) A solution have higher boiling pts. than its pure solvent. B) The boiling pt. of the solution is inversely related to vapour pressure. C) The solvent has lower vapour pressure than the solution. D) The melting pt. of a solution is lower than the solvent.
A) The stronger will be the force of the vapour exerted on the liquid’s surface and on the container. B) Fewer number of liquid molecules will be left. C) The weaker the collective fore exerted by vapour on the liquids surface. D) Greater number of gaseous molecules will escape on the surface of the liquid.
A) A decrease in the vapour pressure of solution means a lesser amount of vapour formed. B) Vapor pressure should be greater than atmospheric pressure for boiling pt. to happen. C) CaBr2 solution has lesser vapour pressure than NaBr2 solution. D) Vapor pressure is the force exerted by liquid molecules on the surface of the container.
A) mol/L B) g/L C) mol/kg D) g/mol
A) mol/kg B) mol/L C) g/L D) g/mol
A) The decrease in the freezing pt. is higher in bottle A. B) The increase in boiling pt. is higher in bottle B. C) The solution in bottle A has higher vapour pressure with that of B. D) The solutes added have no effect on their physical properties.
A) greater number of particles B) bigger size C) greater number of molecules. D) higher molar mass
A) No changes will occur B) Water solution will boil rapidly making the pasta cook faster. C) The boiling point of water will decrease, low enough to cook the pasta. D) Water solution will boil at higher temperature, hot enough to cook the pasta faster.
A) decreasing vapor pressure. B) increasing osmotic pressure C) decreasing osmotic pressure. D) increasing vapor pressure.
A) Vapor pressure lowering B) Boiling point elevation C) Freezing point elevation D) Freezing point depression
A) condensed B) not change C) increase D) decrease
A) Remains the same B) Increase C) Cannot be determined D) Decrease
A) Increase the mass of the solvent and solute at the same rate. B) Decrease the mass of solute while the mass of the solvent remains constant. C) Increase the mass of the solvent twice as much the increase on the mass of solute. D) Decrease the mass of solvent while the mass of the solute remains constant.
A) Increase in vapour pressure B) Increase in vapour pressure C) Increase in boiling pt. D) depends on the amount being added.
A) Any decrease on the energy of the system is also a decrease in the energy of the surrounding. B) They both make up the universe. C) A system is the one where attention is focussed while the rest is the universe. D) A surrounding is the one where attention is focussed while the rest is the system.
A) It is an energy in transit. B) The higher its amount the lower will be the temperature of a certain body. C) It always require physical contact between two bodies for it to travel. D) It travels from colder to warmer body.
A) The total energy of the universe can either decrease or increase. B) The energy of the universe is constant. C) Energy can be destroyed D) Enegy can be created
A) 3 B) 1 C) 4 D) 2
A) kg*s2 B) kg*m/s2 C) kg*m2/s2 D) kg/m/s2
A) The volume of the container that the gases react in B) The colour of the gases C) The pressure of the gases D) The temperature of the gases
A) The calcium carbonate chips are less soluble than the powder. B) The powder has a greater surface area. C) An acid will react faster with a powder D) There are more impurities in the calcium carbonate chips.
A) Heat energy causes some of the reactants to evaporate, increasing the concentration of the reactants B) Heat energy helps to lower the amount of overall energy that is required for the reaction to occur C) Heat energy causes the particles of the reactants to move faster, and therefore react with each other more frequently D) Heat energy increases the size of the molecules of reactants, and therefore the molecules react more frequently
A) Reaction rate decreases with increase in concentration. B) Reaction rate increases with increase in concentration. C) Concentration has no effect on reaction rate. D) Reaction rate increases with the decrease in concentration.
A) Bacteria do not grow well in dark places B) Refrigerators often contain enzymes that slow the rate of food spoiling reactions C) The volume inside the refrigerator decreases the concentration of the food particles, allowing them to decompose more slowly D) The lower temperatures cause the chemical reactions that spoil food to occur more slowly than usual
A) Increase the surface area of the reactants B) Increase the concentration of the reactants C) Increase the temperature of the reactants D) Increase the volume that the reactants take up
A) Increasing concentration increases reaction rate B) Increasing surface area increases reaction rate C) Increasing temperature increases reaction rate D) Increasing volume increases reaction rate
A) Increasing the temperature of the reactants B) Adding a catalyst to the reactants C) Increasing the concentration of the reactants D) Increasing the surface area of the reactants
A) Catalysts B) Simple elements C) Molecules used to increase concentration D) Chemicals that increase surface area
A) Nature of the reactants B) Colour of the reactants C) Particle size D) Temperature of the reactants
A) 0.61 m B) 0.82 m C) 1.63 m D) 2.62 m
A) 9.48 moles B) 6.25 moles C) 0.72 moles D) 1.38 moles
A) 6808 moles B) 3.11 moles C) 1.38 moles D) 6.8 moles
A) 77.78 g B) 189 g C) 35.60 g D) 459.27 g
A) 230 mL B) 290 mL C) 310 mL D) 200 mL
A) 103.64 B) 108.96 C) 109.56 D) 107.45
A) 0.08 B) 0.56 C) 0.42 D) 0.16
A) 0.62 B) 0.84 C) 0.73 D) 0.93
A) 1.46 B) 4.23 C) 2.62 D) 3.38
A) 65.43 B) 63.82 C) 64.58 D) 62.66
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