the rate of an enzyme-controlled reaction increases. More heat means more kinetic energy, so molecules move faster. This makes the substrate molecules more likely to collide with the enzymes' active sites. The energy of these collisions also increases, which means each collision is more likely to result in a reaction.
optimum temperature
the temperature at which the rate of an enzyme-controlled reaction is at its fastest.
the rate of reaction continues to increase until the enzyme reaches its optimum temperature. but if the reaction gets too high the reaction stops. The rise in temperature makes the enzyme's molecules vibrate more. If the temperature goes above a certain level, this vibration breaks some of the bonds that hold the enzyme in shape. The active site changes shape and the enzyme and substrate no longer fit together. At this point, the enzyme is denatured
affect of temperature
A) optimum temperature
B) enzyme is denatured
temperature coefficient / Q10
value for a reaction shows how much the rate of a reaction changes when the temperature is raised by 10 °C
Q10 = Rate at higher temperature / rate at lower temperature
At temperatures before the optimum, a Q. value of 2 means that the rate doubles when the temperature is raised by 10°C. A Q, value of 3 would mean that the rate trebles. Most enzyme-controlled reactions have a Qi value of around 2.
