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Role of a catalyst in chemistry
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Introduction
In chemistry, catalyst is a substance which increases the rate of reaction with itself does not combine in reaction. The aim of this essay is researching more about catalyst, for instant how does catalyst work and the example of catalyst. Also, this research might useful for science international foundation students for support revision. First of all, this essay will describe Maxwell Boltzmann distribution diagram and give the meaning of collision theory, then it will discuss on Activation Energy. After that, activation complex will be explained using enthalpy diagram and catalyst pathway will be focused. Following this, there will be a describing about homogeneous and heterogeneous catalysts, also their own mechanisms and examples. Lastly, this essay will represent the catalytically poisoning.
Discussion
The Maxwell-Boltzmann Distribution
According to Webchem(2005) the Kinetic energy of atoms and molecules can be found using formula Ke=1/2mv2, where m = mass and v= velocity. It can see that their kinetic energy depend on velocity, due to all of particles have a same mass. In the mixture of moving molecule, there are low particles which have very low energy, and also very fast particles which have high energy, as well as most of particles ’s speed are nearly average. However, there is no limit of energy and energy equals zero, including there are not many particles which have much energy, is shown in the figure1.
Figure 1:
Collision theory
From the figure1, there is an activation energy which is a minimum kinetic energy that necessary for particles to be participating of the reaction. According to (Ltd., 2014)Occurrence of chemical reaction requires collision of particles which ha...
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For a reaction to occur, particles must collide. If the collision causes a chemical change it is referred to as a fruitful collision. (Hutchinson Educational Encyclopaedia, 2000) Enzymes increase the rate of exergonic reactions by decreasing the activation energy of the reaction. Exergonic reactions are those in which the free energy of the concluding state is lower than the free energy of the opening state.
Some collisions are successful and give a product while others don't. because particles don't have enough energy. Activation energy - The amount of energy needed for the reaction to be. started. I am a naysayer.
The reactions that take place to convert the harmful gasses to un-harmful gasses could not occur without the right amount of energy, for a reaction to take place it has to reach the correct activation energy. Activation energy is the minimum amount of energy that the reacting species must have in order to undergo the specified reaction. The catalytic converter helps the thermodynamic process by decreasing the activation energy needed for the reaction to take place. The catalyst will not form a product but will change the speed of the reaction.
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.
If a reactant is a solid, then breaking it up into smaller pieces (but keeping the mass the same) will increase its surface area. If there is a larger surface area the reacting particles will have more of an area to react with, therefore there will be more collisions. 4. A catalyst works by giving the reacting particles something to stick to where they can collide with each other, because they are all attracted to the catalyst there are going to be more collisions. A catalyst does not get used up in a reaction.
The catalyst material in a cat is in a wire mesh or honeycomb. This allows a high surface area to be exposed to the passing exhaust gasses. The catalyst converts the harmful nitrogen oxides and carbon monoxide into nitrogen, carbon dioxide, and oxygen.
In this lab, it was determined how the rate of an enzyme-catalyzed reaction is affected by physical factors such as enzyme concentration, temperature, and substrate concentration affect. The question of what factors influence enzyme activity can be answered by the results of peroxidase activity and its relation to temperature and whether or not hydroxylamine causes a reaction change with enzyme activity. An enzyme is a protein produced by a living organism that serves as a biological catalyst. A catalyst is a substance that speeds up the rate of a chemical reaction and does so by lowering the activation energy of a reaction. With that energy reactants are brought together so that products can be formed.
Kinetic energy behaves a bit differently depending on the type of collision: elastic or inelastic.
The diagram shows particles that are not moving quickly. This means that the chance of these particles colliding and causing a chemical reaction is rather low. The temperature is obviously low too, as is the particles have little energy to move quickly. However, if heat were added. The particles would have more energy and move quicker and have a better chance of colliding with the other.
The aim of this experiment was to investigate the affect of the use of a catalyst and temperature on the rate of reaction while keeping all the other factors that affect the reaction rate constant.
If there is a large particle with a large surface area, and many small particles, the smaller particles have a higher chance of colliding with the larger particles. However, if there are small particles, and small particles of another compound, then the reaction rate would be slower, because the particles wouldn’t collide as easily as they would with particles of a bigger size. The third factor that affects collisions is the temperature. If there is a higher temperature, then the particles are able to move freer and faster, than they would if the temperature was lower. This means that the reaction rate would be faster, because the collisions of the particles are more frequent.
Reactions occur when the particles of reactants collide together continuously. If they collide with sufficient energy, then they will react. The minimum amount of kinetic energy required for particles at the time of collision is called the activation energy and this theory is known as the ?collision theory?.
There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface area (of solid reactants), and catalysts. I have chosen to investigate the effect of concentration on the rate of reaction. This is because it is the most practical way to investigate. Dealing with temperatures is a difficult task, especially when we have to keep constant high temperatures. Secondly, the rate equation and the constant k changes when the temperature of the reaction changes.
Chemical kinetics is the study and examination of chemical reactions regarding re-arrangement of atoms, reaction rates, effect of various variables, and more. Chemical reaction rates, are the rates of change in amounts or concentrations of either products or reactants. Concentration of solutions, surface area, catalysts, temperature and the nature of reactants are all factors that can influence a rate of reaction. Increasing the concentration of a solution allows the rate of reaction to increase because highly concentrated solutions have more molecules and as a result the molecules collide faster. Surface area also affects a
One vital process in the human body observed in chemistry is the idea of chemical kinetics. Chemical kinetics is the study of the rate of reactions, or how fast reactions occur.1 Three factors that affect chemical kinetics are concentration, temperature, and catalysis. As the concentration of a substance increases, the rate of the reaction also increases.1 This relationship is valid because when more of a substance is added in a reaction, it increases the likelihood that the