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Reaction Rate Orders
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🧪 Chemistry
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Parameters
Initial Concentration [A]0 (mol/L)
Rate Constant k
Key Concepts
•
Zero order
: rate is constant, [A] decreases linearly — graph is a straight line
•
First order
: rate ∝ [A], exponential decay — constant half-life shown (dashed)
•
Second order
: rate ∝ [A]², hyperbolic decrease — concentration persists longer at low [A]
• To determine order: plot [A] vs t (0th), ln[A] vs t (1st), 1/[A] vs t (2nd) — the linear plot reveals the order
• Units of k: mol L−¹ s−¹ (0th), s−¹ (1st), L mol−¹ s−¹ (2nd)
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