Order, rate equations and rate constants

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Last updated 5:33 PM on 10/6/26
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6 Terms

1
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What is the rate equation

Rate= k[A]

units= moldm-3s-1

2
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What is zero order

  • When conc. of reactant has no effect reaction is zero order

  • As conc. changes rate stays the same


3
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What is first order

  • Rate depends on its conc. raised to power of one

  • ROR directly proportional to conc. of reactant


4
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What is second order

  • Rate depends on conc. raised to the power of two

  • ROR is proportional to square of conc. of reactants


5
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Rate-concentration graphs

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6
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Concentration-time graphs

First order produces a downward curve with a decreasing gradient over time. In first-order concentration-time graphs time for concentration of reactant to halve is constant, this is called half-life.

<p>First order produces a downward curve with a decreasing gradient over time. In first-order concentration-time graphs time for concentration of reactant to halve is constant, this is called half-life.</p>