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