In order to determine the order of reaction graphically we...

In order to determine the order of reaction graphically, we graph different quantities on the axes. One of the graphs you draw will show a linear line, which tells us the order of reaction. If we have one reactant, (call it A), complete the following table. order rate law units of k integrated rate law what to graph for a straight line 0 1 2

Transcript

00:01 In this video, we're going to talk conceptually about the different orders of the reaction, 0, 1, or 2, and the properties and what a reaction looks like.

00:11 So suppose that the reaction in question is that a makes b.

00:15 So a is going to be the reactants.

00:17 If we have a zero order reaction, it doesn't depend on any of the reactants, and the rate is just equal to a rate constant k.

00:25 If it's first order, the rate is equal to the rate constant multiplied by, the concentration of the reactants to the first power.

00:34 And for second order reactions, we're going to multiply or so to speak raise it to the second power.

00:41 So basically what you're exponentially raising the reaction concentrations do, that's what the order is.

00:48 All right.

00:48 Now what are the units of the rate constant? so for a zero order reaction, we see that k is equal to the rate.

00:54 So the rate is expressed as a concentration on molarity per unit of time per second usually.

01:00 So molarity per second will also be the units of k.

01:04 Now for our first order to isolate k, we'd have to divide out a molarity.

01:08 So molarity per second divided by malarity just leaves you with one over seconds, or sometimes it's written as inverse seconds.

01:16 All right.

01:17 I know for second order, if we have molarity per second equals whatever k is times a molarity squared, we divide by molarity twice.

01:28 So we'll have one malaria on the bottom and also the seconds on the bottom.

01:31 So it's one over molar times second, which can also be written as m to the negative 1, s to the negative 1 like so.

01:40 Let me erase this so we don't get confused...

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