This website was used on October 3, 2014 to help develop a better understanding of collision theory in order to explain the various factors affecting the rate of reaction.…
The purpose of this lab is to learn how to write law expressions, determine orders by graphs, and calculate rate constants. By determining the number of drops of sodium hypochlorite necessary to make a diluted food dye change to colorless in less than three minutes helps calculate the absorbance which can then be analyzed to find the pseudo rate constant and eventually leading to the rate constant and the rate law. The results show that the m and n are both 1st order which makes the overall order of the blue dye 2nd order.…
Obtain boiled, deionized water, pipets or burets, and 20-mL beakers or 150 mm test tubes in order to mix solutions for 8 kinetic trials.…
An investigation to show how the rate of reaction between hydrochloric acid and sodium thiosulphate is affected by the concentration of the acid…
a. An increase in temperature at which a reaction takes place causes an increase in reaction rate .…
( vii) Study the effect of temperature at 288K on the rate of chemical reaction.…
‘Kinetics’ is the study of chemical reactions. The speed of a reaction can vary depending on many variables such as the nature of the reactants, particle size, concentration and temperature. For a chemical reaction to occur, there must be a collision between reactants. The reaction rate is slower when the reactants are large and complex molecules because it takes longer for the molecules to combine together creating a chemical reaction. More than 2000 years ago, Democritus, who was a philosopher from Greece suggested that matter is made up of tiny particles too small to be seen. He thought that if you kept cutting a substance into smaller and smaller pieces, you would eventually come to the smallest possible particles.…
Abstract: When combining compounds, there are always two roles considered in the reaction. These are reactants and products. Reactants are the initial compounds before mixing. The products are synonymous with the term byproduct, or what remains when the reaction occurs. For example, Sodium (Na+) and Chlorine (Cl-) are mixed to create Sodium Chloride (NaCl) . In this example, sodium and chlorine are the reactants and sodium chloride is the product. The use of rate laws expresses the rate of a given reaction to produce a concentration of a reactant in a given chemical reaction such as described with sodium chloride. This is important because the use of rate laws can be used to calculate how much of a reactant is used and how quickly a reaction occurs based on the level of concentration of the reactants. Knowing this, chemists can speed up or slow down reactions which is useful if the initial reaction time is extremely long or requires an exorbitant about of products to produce the desired results in the reaction.…
1. The reaction order of the solution was second order because the reciprocal of the concentration of the solution VS. time produced the straight line.…
We performed two trials of nine different variables of reactions to determine what increases/decreases reaction rates. The variables we used are hot/cold and room temperature water, a equal mixture of HCL and water, A equal mixture of NaOH and water, either a whole, broken, or finely crushed Alka-seltzer tablet. The fastest rate average was at 0.04 s (finely crushed Alka-seltzer with room temp. water). The slowest rate average is 8.02 s (Alka-seltzer with cold water).…
Catalyst affects the rate of a chemical reaction. One consequence of enzyme activity is that cells can carry out complex chemical activities at relative low temperatures. The enzyme is not changed in the reaction and can even be recycled to break down additional substrate molecules. If you add salt to a catalase will it denature or slow down the reaction of hydrogen peroxide into water and hydrogen gas…
If half of the starting quantity of A is used up after 56 seconds, calculate the fraction that will be used…
Given the evidence, it can be determined that a reaction will occur when reactants have a kinetic energy greater than the activation energy, this is a theory of collision theory. For example, in the first experiment, the test tube filled with 10 mL of 3% hydrogen peroxide and had scoop of manganese dioxide, had a greater reaction than the other test tube. Which simply contained 10 mL of 3% hydrogen peroxide. The factor that affected the reaction rate was that the manganese was seen as a catalyst. The reason collision theory relates to this experiment is due to the fact that the catalyst creates a higher activation energy and this causes more collisions, which increases the reaction rate.…
The rate of a reaction can be measured by the rate at which a reactant is used up, or the rate at which a product is formed.…
Investigating how the concentration of sodium-thiosulphate (STS) and hydrochloric acid (HCL) affects the rate of reaction in the experiment. In addition I am also checking how different variables affect my experiment and also how I can make my test more precise, reliable and accurate.…