The rate of reactions can be sped up by increasing the temperature, increasing the surface area, increasing the concentration and catalysts.
The hypothesis tested in this experiment was, if the temperature of enzyme catalysis were increased, then the reaction rate would increase, because enzyme-catalysis reacts by randomly colliding with substrate molecules, and the increase in temperature increases the speed of collision or reaction rate. The final data collected for the experiment was positive with my hypothesis. The coffee filter, covered in potato solution, sank and rose at a faster pace in the hydrogen peroxide when the temperatures were raised.
Independent variables: Was temperature 30 degrees Celsius, 60 degrees Celsius, 90 degrees Celsius, and 100 degrees Celsius. We also used a thermometer in beaker so we did not lose heat.
If there is more heat involves in a reaction it will occur at a faster speed as the heat provides the particles with more energy. Likewise, if the temperature at which the reaction is occurring is low it will slow down the reaction. The experiment is being done at room temperature because then temperature does not play a great role in the reaction, and therefore the reaction is happening based solely on the acids, and metal. Something else that is required for a chemical reaction to occur is the Collision theory.
Temperature controls the speed the enzymes work at. Higher temperatures increase the kinetic energy which increases the chance of collision therefore speeding up the rate of
Temperature, a solution’s concentration, reactant’s surface area and whether a catalyst is in effect, all affect reaction rate. When the temperature is increased increases the speed of the molecules, which will speed up the reaction rate, as the molecules will collide more often. When concentration is increased, molecules have restricted room to roam which brings about a greater chance of collisions. The reaction rate is also greatly affected by the surface area, as the
The effects temperature ,we all the basic as temperature increases so does the movement in the molecules which means as you increase the temperature the rate of reaction increase as well. For most reactions that happen around room temperature which is about 70 degrees Fahrenheit ,for every approx.10 degrees Celsius the rate of reaction doubles. The rate of reaction is calculated using the the Arrhenius rate equation . The Arrhenius rate law is “an equation describing the mathematical relationship between temperature and the rate of reaction ” ."K=A*exp(-Ea/R*The equation relates k, the rate constant for a given chemical reaction, with the temperature, T, the activation energy for the reaction, Ea , the pre-exponential factor A, and the universal gas constant, R. High temperature and low activation energy favor larger rate constants, and therefore speed up the reaction". Source: Boundless. “The Arrhenius Equation.” Boundless Chemistry. Boundless, 20 Sep. 2016. Retrieved 04 Nov. 2016 from
For the investigation of enzymes, I am going to conduct an experiment to see how temperature can affect the rate of reaction of enzymes by testing it with starch.
As seen in figure 1, the amount of oxygen increased from 20.75% to 22% rapidly between 20 and 30 seconds. There was also an aggressive increase between 170 and 180 seconds from 27.1% to 28%. Otherwise, the increase was relatively stable, with slight increases and decreases throughout. On the other hand, when an acid and base (hydrochloric acid and sodium hydroxide, respectively) were added to the reactive solution, the increase was relatively stable for the acid, while inconsistent for the base, in general.
Every time the temperature is increased the molecules begin to move faster which would mean there would be more collisions. This then means to the rate of reaction will become faster. Like I mentioned before if the temperature gets to high the molecules vibrate aggressively which then breaks the chemical bonds of the enzyme, in other words the enzyme becomes denatured.
In this graph we can see, when the temperature is high, the rate of the reaction also increases, but when temperature is too high it denatures the enzyme. In this case enzyme’s activity is changing with increasing the temperature and by this the reacting molecules have more kinetic energy and they move faster and they have a better chance to collide. There is a specific temperature at which enzyme’s activity is the best, and this is known as (Optimum) and this temperature is 37 C (Human body temperature). After this point the temperature continue increasing, the rate of the reaction decrease and the enzyme denature (when the enzyme loses its original shape), this is the cause that enzyme stop working as it cannot bind to the substrate.
In experiment 2, temperature was the factor tested to see how it affected the rate of reactions. Tweaking the method for the first experiment, the sodium thiosulphate were in three different temperature; one was placed on a hotplate and heated, another in an ice bath and the last was room temperature. This showed how the temperature of the solution can be an important factor when investigating reaction rates. Concentration of the reactants affects reaction rate by increasing the rate when the concentration is also increased. According to the collision theory proposed by Max Trautz in 1916 and William Lewis in 1918, for two molecules to react they must first come into contact with each other, called a collision. The molecules are more likely to collide if they
Temperature - Reducing temperature can slow down the rate of reaction as there is a lower amount of kinetic energy, leading the enzymes and substrate to collide less often, meaning that the reactions will not take place.. Conversely,