First order graph


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Amy Lefley 1J
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Joined: Fri Sep 28, 2018 12:15 am

First order graph

Postby Amy Lefley 1J » Tue Mar 05, 2019 2:51 pm

When graphing a first order reaction, with time on the x-axis and ln(A) on the y-axis, the y-intercept is the natural log of the initial concentration of the reactant, but what does the x-intercept of this graph represent?

Gillian Murphy 2C
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Joined: Fri Sep 28, 2018 12:22 am

Re: First order graph

Postby Gillian Murphy 2C » Tue Mar 05, 2019 2:54 pm

time

Rachel-Weisz3C
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Joined: Fri Sep 28, 2018 12:23 am

Re: First order graph

Postby Rachel-Weisz3C » Tue Mar 05, 2019 3:34 pm

It represents time and it is usually measured in seconds, therefore rate = M/s, but it can also be measured in minutes, hours... depending on the reaction.

Heesu_Kim_1F
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Joined: Fri Sep 28, 2018 12:18 am

Re: First order graph

Postby Heesu_Kim_1F » Tue Mar 05, 2019 4:20 pm

The x-intercept (meaning y=0) of the first order graph would represent the time (usually in seconds) when the concentration of the reactant reaches 0, or essentially when there is no more reactant concentration left.
Hope this helps!

Megan_Ervin_1F
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Joined: Fri Sep 28, 2018 12:18 am

Re: First order graph

Postby Megan_Ervin_1F » Thu Mar 07, 2019 12:21 pm

If ln(A) vs Time is a straight line, then the reaction is a first order reaction

mbaker4E
Posts: 69
Joined: Fri Sep 28, 2018 12:26 am

Re: First order graph

Postby mbaker4E » Thu Mar 07, 2019 2:45 pm

The x axis is time, usually in seconds but it can also be in minutes, days, etc.

varunhariharan
Posts: 30
Joined: Mon Jan 07, 2019 8:16 am

Re: First order graph

Postby varunhariharan » Thu Mar 07, 2019 3:44 pm

The x-intercept shows how much time time (t) it takes for the natural log of [A] to equal zero, and for [A] to equal zero.

Nicole Lee 4E
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Re: First order graph

Postby Nicole Lee 4E » Thu Mar 07, 2019 3:47 pm

The x-intercept would tell you the time at which all of your reactant A runs out.


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