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Spread the Happiness Chemical Kinetics _ 48 A&R Type Test Items (8 Concepts)
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Spread the HappinessChemical Kinetics _ 48 A&R Type Test Items (8 Concepts)
Concept-1: Rate of a reaction (average and instantaneous)
Assertion: The rate of a reaction increases when the concentration of reactants is increased. Reason:
Increasing the concentration of reactants increases the number of collisions between them, leading to an
increase in the rate of the reaction.
Assertion: The rate of a reaction decreases with time. Reason: As the concentration of reactants decreases
with time, the number of collisions between them decreases, leading to a decrease in the rate of the reaction.
Assertion: The rate of a reaction increases when the temperature is increased. Reason: Increasing the
temperature increases the kinetic energy of reactant molecules, leading to an increase in the number of
collisions with sufficient energy to overcome the activation energy, and hence an increase in the rate of the
reaction.
Assertion: The rate of a reaction increases in the presence of a catalyst. Reason: Catalysts provide an
alternative pathway for the reaction with lower activation energy, increasing the number of collisions with
sufficient energy to react and hence an increase in the rate of the reaction.
Assertion: The order of a reaction can be determined experimentally. Reason: The order of a reaction refers to
the dependence of the rate on the concentration of reactants. By varying the concentration of reactants and
measuring the rate, the order of the reaction can be determined experimentally.
Assertion: The activation energy of a reaction can be calculated from the Arrhenius equation. Reason: The
Arrhenius equation relates the rate constant of a reaction to the activation energy, temperature, and
frequency factor. By manipulating the equation, the activation energy can be calculated from experimental
data.
Concept 2. Factors affecting rates of reaction: concentration, temperature, catalyst
Assertion: Increasing the concentration of reactants increases the rate of reaction. Reason: This is because the
number of effective collisions between reactant particles increases, resulting in a higher probability of
successful collisions.
Assertion: A catalyst increases the rate of reaction without being consumed in the reaction. Reason: This is
because a catalyst provides an alternative pathway with lower activation energy for the reaction, allowing
more reactant particles to have sufficient energy to react.
Assertion: Increasing the temperature of the reaction increases the rate of reaction. Reason: This is because
an increase in temperature leads to an increase in the kinetic energy of the reactant particles, increasing the
frequency and energy of collisions.
Assertion: A decrease in reactant concentration causes a decrease in the rate of reaction. Reason: This is
because the number of effective collisions between reactant particles decreases, resulting in a lower
probability of successful collisions.
Assertion: A reaction with a larger activation energy requires a higher temperature to increase its rate.
Reason: This is because a higher temperature increases the kinetic energy of the reactant particles, allowing
more particles to have energy equal to or greater than the activation energy, and increasing the frequency of
effective collisions.
Assertion: The use of a catalyst lowers the activation energy of a reaction. Reason: This is because the catalyst
provides an alternative reaction pathway with a lower activation energy, allowing more reactant particles to
have sufficient energy to react and increasing the frequency of effective collisions.
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