Why do you get a curved line on a graph comparing temperature to rate of reaction, why isn't it just straight?

Question

Answers quick pleaaaase - coursework is in for today!!!

Answer 1

The temperature changes as the reaction progresses -- depends on whether its endothermal or exothermal as well.

Answer 2

Why should it be straight? Reaction occurs owing to collisions between particles whose energy is at least the activation energy. To make things simple consider a first order reaction in an ideal gas. The speed of the gas molecules will have a Maxwell-Boltzmann distribution (google this for more information). Look at the curve and work out a speed corresponding to a typical activation energy. Mark this, as a vertical line, on the curve. The area to the right of this represents the number of particles whose energy is above the activation energy. Now if the temperature increases the curve moves to the right (although the total area underneath it remains constant). This means that there will be more molecules with sufficient energy to react. But also, because the average speed of the particles is greater the frequency of collisions will also be greater. Both these two factors will increase the rate of reaction as the temperature increases. So the relationship between reaction rate and temperature is not likely to be linear.

Ideally you should do a mathematical analysis of this at different temperatures, either using calculus or numerically, and plot a graph of your results. Make sure that you use the correct units for temperature.

I hope you've got a few more hours left and you don't have anything else that you have to do before the coursework has to be handed in.

Answer 3

Because the rate of the reaction changes as the concentration of the reactants is reduced due to the ongoing reaction. This results in a "logrithmic" curve that represents the change. The idea is that if there are less particles concentrating a reaction it will take longer for them to find each other and therefore increase the time it would take for the same ammount of reactant to fully react.

Answer 4

let rate of reaction = the y-axis
temperature= the x-axis
whatever the reaction is ....
it will not be 100% dependant on temperature
if it's slow at zero degrees, and speeds up as temp rises...
it will reach a maximum where higher temp has little effect
in other words there is always a 'best' temperature for a reaction to occur

Answer 5

The line is curved because the rate of reaction slows down as all the energy is used up. It also depends whether the reaction is exothermic or endothermic. Hope this helps!

Answer 6

ive done this coursework how weird.

its because there is more hydrochloric acid (say) at the beginning of the experiment so the rate of reaction is faster. This couldnt be shown by a straight line

lots of other factors will change yor mind

Answer 7

as temperature increases, rate of reaction decreases as hydrogen bonds in the molecules of the substances within the reaction start to break down over 45 degrees, enzymes for example become "denatured".

GOOD LUCK, you need it!

Answer 8

i think its because when the temperature gets too high (enzymes work best at 37 degrees and become denatured if the temp goes too far past this) the enxymes become useless and therefore cannot process and break down what they are working on resulting in a drop of reaction

Answer 9

the relation between temperature andROR is disectly proportional which means that with increase in temp . we will have a faster rate.it increases slowly and attains a peak then becomes totally independent/ giving us a curved line.

Answer 10

because the higher the temp the faster the reaction acceletates