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Interactive Grade 11 Science Reaction Rates & Catalysts Worksheet

Science · Grade 11 · 15 questions

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Reaction Rates & Catalysts

In a Maxwell-Boltzmann distribution, which of the following correctly describes the relationship between the peak of the curve and the most probable speed of molecules?

A.The peak of the curve corresponds to the mean speed of molecules in the sample.B.The peak of the curve corresponds to the most probable speed — the speed possessed by the greatest number of molecules.C.The peak of the curve corresponds to the root mean square speed, which is used in kinetic energy calculations.D.The peak of the curve corresponds to the activation energy required for a successful reaction.

The rate equation for a reaction is: rate = k[A]²[B]. If the concentration of A is doubled while the concentration of B is halved, what happens to the reaction rate?

A.The rate doublesB.The rate remains the sameC.The rate is halvedD.The rate quadruples

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

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