The Maxwell-Boltzmann distribution of molecular energies is useful for explaining whyincreasing temperature affects the rate of a chemical reaction.(a) Which of the following statements describes how the shape of the Maxwell-Boltzmann distribution curve changes as temperature increases?(1)A The peak decreases in height and moves to the left.B The peak increases in height and moves to the left.C The peak decreases in height and moves to the right.D The peak increases in height and moves to the right.(b) The main reason that reaction rates increase with temperature is that(1)A all the molecules move faster.B all the molecules collide more frequently.C more molecules collide with the correct orientation.D a larger proportion of molecules have high energies
Question
The Maxwell-Boltzmann distribution of molecular energies is useful for explaining whyincreasing temperature affects the rate of a chemical reaction.(a) Which of the following statements describes how the shape of the Maxwell-Boltzmann distribution curve changes as temperature increases?(1)A The peak decreases in height and moves to the left.B The peak increases in height and moves to the left.C The peak decreases in height and moves to the right.D The peak increases in height and moves to the right.(b) The main reason that reaction rates increase with temperature is that(1)A all the molecules move faster.B all the molecules collide more frequently.C more molecules collide with the correct orientation.D a larger proportion of molecules have high energies
Solution
(a) The correct answer is C. The peak decreases in height and moves to the right. As temperature increases, the average kinetic energy of the molecules also increases. This means that more molecules are moving at higher speeds, shifting the peak of the distribution to the right. The peak also decreases in height because the molecules are spread out over a wider range of speeds.
(b) The correct answer is D. A larger proportion of molecules have high energies. While all of the options listed do occur as temperature increases, the main reason that reaction rates increase is that more molecules have the energy necessary to overcome the activation energy of the reaction. This means that a larger proportion of collisions result in a reaction, increasing the overall rate of the reaction.
Similar Questions
How does a temperature increase cause the rate of a reaction to increase?A.It decreases orientation requirements of the molecules.B.It increases the equilibrium constant for the reaction.C.It increases the kinetic energy of the molecules.D.It decreases the activation energy of the reaction.SUBMITarrow_backPREVIOUS
How does increasing temperature increase the number of reactions?A.It lowers the amount of energy needed for a reaction to occur.B.It increases the collisions that have enough energy to react.C.It increases the length of time the molecules are together.D.It makes the orientation of the molecules not important.
Consider this graph and explain on the basis of Maxwell Boltzmann curve of kineticenergy the effect of temperature on rate of reaction.(1+2)ORState Dalton’s law. Also write its two applications.
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As the temperature of a chemical reaction increases, the rate of reaction increases becauseA fewer particle collisions occurB the required activation energy increasesC more effective particle collisions occurD the concentration of the reactants increases
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