## straight line to fit data

$\frac{d[R]}{dt}=-k; [R]=-kt + [R]_{0}; t_{\frac{1}{2}}=\frac{[R]_{0}}{2k}$

Alison Trinh 1E
Posts: 104
Joined: Thu Jul 25, 2019 12:16 am

### straight line to fit data

What does having a straight line when plotting data tell us?

Helen Struble 2F
Posts: 97
Joined: Sat Aug 24, 2019 12:17 am

### Re: straight line to fit data

Depending on the order of the reaction, you will have to plot time by a different y-axis to achieve a straight line with slope kr or -kr. For zero order reactions, simply plot [A] by t. For first order, plot ln[A] by t. For second order, plot 1/[A] by t. If you are given a graph of a straight line then, you can figure out the order by looking at the variable in thew y-axis.

Sofia Barker 2C
Posts: 101
Joined: Wed Sep 18, 2019 12:21 am

### Re: straight line to fit data

If you plot [A] vs time and get a straight line, this tells us that the reaction is zero order.
If you plot ln [A] vs time and get a straight line, this tells us that the reaction is first order.
If you plot 1/[A] vs time and get a straight line, this tells us that the reaction is second-order.

Christine Honda 2I
Posts: 116
Joined: Sat Sep 14, 2019 12:17 am

### Re: straight line to fit data

Depending on the order of the reaction, the straight line (whether it is a positive or negative slope and the graph axis labels itself) will tell you the order of the reaction.

Emily Chirila 2E
Posts: 112
Joined: Sat Jul 20, 2019 12:16 am

### Re: straight line to fit data

Given a graph of a straight line, you need to be able to know what order the reaction is based off the y-axis.

Nicholas Chin 1G
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

### Re: straight line to fit data

The slope will also give you a different constant value depending on the order of the reaction.