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Which of the following are correct for first-order reactions? Select all that apply. ? The reaction slows down as the reaction proceeds. ? A higher concentration of reactants will speed up the reaction. ? The concentration of the reactants changes nonlinearly. The half-life of the reaction stays constant as the reaction proceeds The units for the rate constant and the rate of reaction are the same.
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Answer #1

The behavior of a first order reaction is:

[A] = [A]o x e-kt

[A] is the concentration of the reactant

k is the rate constant

t is the time

1. true the reaction will slow down as the reaction proceeds, the concentration of the reactants will decrease through the time that is why you can expect a slower reaction.

2. true, according to the equation a higher concentration of reactants will increase the rate of reaction

3. true, according to the equation of a first order reaction the concentration of reactants will change non linearly

4. true, for a first order reaction half life is constant as the reaction proceeds

5. false, the units of rate constant is sec-1, units of rate of reaction is M s-1

*hope you find it useful =)

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