First order graph

[Amy Lefley 1J]

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]

time

[Rachel-Weisz3C]

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]

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]

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

[mbaker4E]

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

[varunhariharan]

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]

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