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Interactive Grade 11 Science Reaction Rates & Catalysts Test

Science · Grade 11 · 15 questions · 10 min

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Reaction Rates & Catalysts

A chemist wants to study the effect of concentration on reaction rate. They design an experiment where they react dilute HCl with sodium thiosulfate solution, varying only the concentration of sodium thiosulfate. Which variable must be kept constant to ensure a valid investigation?

A.The type of measuring equipment usedB.The temperature of the reaction mixtureC.The colour of the reaction vesselD.The atmospheric pressure in the laboratory

In the presence of a platinum catalyst, hydrogen gas reacts with oxygen gas to form water. If the same reaction were to occur without the catalyst, it would require a much higher temperature to proceed at a measurable rate. This is because the catalyst:

A.Increases the kinetic energy of hydrogen and oxygen moleculesB.Provides an alternative reaction pathway with a lower activation energyC.Shifts the equilibrium position to favour water formationD.Increases the concentration of hydrogen and oxygen molecules

In a reaction energy profile, the transition state (activated complex) is located at:

A.The lowest point on the energy profile, corresponding to the most stable intermediateB.The peak of the energy profile, corresponding to the maximum energy point along the reaction pathwayC.The energy level of the products, after the reaction is completeD.The point where reactant energy equals product energy

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