Medicine year 2

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Stability kinetics

Last updated 5:51 PM on 9/26/26
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4 Terms

1
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working out rate of reaction from a graph = change in concentration over time

The gradient/slope is:

Slope=change in concentrationchange in time

More specifically:

Slope= A2−A1

—————

t2−t1

Where:

  • A1 = initial concentration

  • A2 = final concentration

  • t1 = initial time

  • t2 = final time

⭐ Remember:

CHANGE=FINAL−INITIAL

<p>The gradient/slope is:</p><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span>Slope=change&nbsp;in&nbsp;concentrationchange&nbsp;in&nbsp;time</span></p><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj">More specifically:</p><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span>Slope= A2−A1</span></p><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span> ————— </span></p><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span> t2−t1</span></p><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj">Where:</p><ul><li><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span>A1</span> = <strong>initial concentration</strong></p></li><li><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span>A2</span> = <strong>final concentration</strong></p></li><li><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span>t1</span> = <strong>initial time</strong></p></li><li><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span>t2</span> = <strong>final time</strong></p></li></ul><p><span data-name="star" data-type="emoji">⭐</span> Remember:</p><p class="x1yc453h xma8rkl xgoqxah xutxfr x1fie51u xgyxj25 x1xobyvs x1elgs31 x1fv8qjw xcy5tzr x1ht4adc xnvauns x1c2l018 x14l7nz5 xuw7688 x1pjt2rx x160d6zm xrxpjvj"><span>CHANGE=FINAL−INITIAL</span></p>
2
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When calculating the rate of reaction from the slope of a graph why does the rate become positive when at first it was negative ?

The slope is negative because the concentration is decreasing.

But when we're talking about the rate of disappearance of the drug, we normally wantthe rate expressed as a positive number.

Therefore:

Rate= −ΔAΔt

So:

Rate=−(−2)

Rate=+2%/h



3
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straight line on a rate time graph indicates what order of reaction

first order

horizontal line is zero order

<p>first order </p><p>horizontal line is zero order </p>
4
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