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Lab report introduction to chemical reactions
Lab report introduction to chemical reactions
Lab report introduction to chemical reactions
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Determining the Activation Energy of the Reaction Between Bromide Ion and Bromate Ion in Acid Solution
Objectives:
By reacting Potassium Bromide and Potassium Bromate in the acid
solution in varies temperature, we can then determine the Activation
Energy of the reaction in different temperature through the equation:[IMAGE].
Results:
Experiment Temperature
Time t/s
ln 1/t
Temperature K
1/K
80
≒0
N/A
353
2.83286119*10-3
50
21
-3.044522438
324
3.086419753*10-3
45
27
-3.295836866
316
3.164556962*10-3
40
42
-3.737669618
315
3.174603175*10-3
35
70
-4.248495242
311
3.215434084*10-3
30
113
-4.727387819
304
3.289473684*10-3
Questions:
1. Give an equation for the reaction between phenol and bromine.
[IMAGE]
2. What is the use of methyl orange in this experiment?
The methyl orange is used as an indicator for the reaction. Bromine
will be produces during the reaction and it will react with phenol
rapidly. Once all the phenol is used up, further bromine produced will
bleach the methyl orange immediately. So the rate of the reaction can
be calculated from the time for the indicator to be decolorized.
3. Based on your results, is it advisable to perform the experiment at
high temperatures such as 80℃?
From the above results, the time of the reaction is shorter as the
experiment temperature increase. So it is not advisable to perform the
experiment at high temperatures as the time of reaction is too short,
it is not easy for us to record.
4. Why is it not necessary to know how far the reaction has proceeded
at the point where the methyl red is decolourized?
In the experiment, the number of mole and the molarity of each
chemicals used are the same. And the appearance of the pink colour
only determines that there are some content of the reaction has
When 1-bromobutane is reacted with potassium t-butoxide there is only one product formed, 1-butene. This is because the halide is on a primary carbon thus producing only one product.
Procedure: Anisole (0.35mL, 0.0378mol) was obtained and placed in a pre-weighed 25 mL round bottom flask, along with 2.5 mL of glacial acetic acid and a magnetic stir bar. Then the reaction apparatus was assembled, the dry tube was charged with conc. sodium bi sulfate, the 25 mL round bottom was attached to the apparatus, and 5 mL of Br2/HBr mixture was obtained and placed in the round bottom. The reaction took place for 20 minutes. An orange liquid was obtained and placed in a 125 mL Erlenmeyer flask along with 25 mL of water and 2.5 mL of conc. Sodium bisulfate soln. The solution was then placed in an ice bath to precipitate and then the solid product was filter in a Buchner funnel. These crystals were then re-dissolved minimum amount of hot solvent (heptane) and recrystallized. Once a dry product was obtained, a melting point was established (2,4-Dibromoanisol mp 55-58 C) and percent yield was established (52%).
This experiment was divided into two main steps. The first step was the addition of bromine to trans-stilbene. Trans-stilbene was weighted out 2.00g, 0.0111mol and mixed with 40ml of glacial acetic acid in 100ml Erlenmeyer flask on a hot bath. Pyridinium hydrobromide perbromide of 4.00g, 0.0125mol was added carefully into the flask.
The rate at which Alka-Seltzer tablets reacts with water Statement of problem The aim of the experiment is to find out the rate at which Alka-Seltzer tablets react with water. The input variable that I will change is temperature. The output variable will be measured by the time it takes for the Alka-Seltzer tablets to dissolve.
Investigating the Rate of Reaction Between Marble Chips and Hydrochloric Acid I am investigating the rate of reaction between marble chips (calcium
The Effect of Concentration of Hydrochloric Acid on the Rate of Reaction with Magnesium Aim: To investigate the effect of concentration of hydrochloric acid on the rate of reaction with magnesium Prediction: As the concentration of the hydrochloric acid increases, so will the rate of reaction Hypothesis: In a reaction, particles of two different reactants react together to form a product. The reaction only takes place on account of two things, if the particles collide, and if the collision has enough 'activation energy'. The two reactant particles, in this case magnesium particles and hydrochloric acid particles, must collide with each other on the correct 'collision course'. If this does not occur then no chemical reaction will take place. The reaction must also have enough energy, this can be affected by temperature, the more heat the particles have the faster they move and so the more energy therefore more chance of successful collisions.
activation energy needed to be activated. I have chosen to do concentration of acid because surface area is difficult to measure, pressure is hard to do in a school lab, and temperature could be dangerous e.g. if acid boils it could spit.
Experiment is to investigate the rate of reaction between hydrochloric acid and calcium carbonate Hydrochloric acid + Calcium Carbonate Þ Calcium Chloride + Water + Carbon Dioxide 2HCl (aq) CaCo3 (s) CaCl2(s) H2O (aq) CO2 (g) There are a number of variables in this experiment and these are listed below as input variables and outcome variables.
from 10cm to 50cm to make it easier to see the difference in a graph.
Having that exhilarating dream, or terrifying one makes me wonder about dreams. The wonder of dreams grows by the day. I continually ask myself why do I dream; what causes me to dream? Where do our dreams originate and occur? Do my dreams have meaning? The answers to these questions are a little complex. The answers I have to give are very sophisticated and need to be thoroughly thought out.
Determination of the Enthalpy Change of a Reaction. Determine the enthalpy change of the thermal decomposition of calcium carbonate by an indirect method based on Hess' law. Determination of the Enthalpy Change of a Reaction. Determine the enthalpy change of the thermal decomposition of calcium carbonate by an indirect method based on Hess' law. Using the proposed method of obtaining results, these values were gathered.
be yes as I will then be able to use enthalpy change of reaction to
borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may
Investigating How the Concentration of Hydrochloric Acid Affects the Rate of Reaction with Calcium Carbonate
The aim of this investigation is to: 1) find the rate equation for the reaction between hydrogen peroxide, potassium iodide and sulphuric acid by using the iodine stop clock method and plotting graphs of 1/time against concentration for each variable. Then to find the activation energy by carrying out the experiment at different temperatures using constant amounts of each reactant and then by plotting a graph of in 1/t against I/T, 3) to deduce as much information about the mechanism as possible from the rate equation.