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Catalysis
Catalysis - It has been mentioned earlier that a catalyst usually increases the rate of reaction. A catalyst is not consumed in the reaction, it is used up in one step and then released in the next step. Catalytic reactions can be classified into two types. They are i) Homogenous reaction..
Types of Catalysis
In the first step (A), ethylene and hydrogen molecules diffuse to the catalyst (Platinum) surface. In the second step (B), the reactants are chemisorbed. The pi electron of ethylene form bonds with the platinum metal, and hydrogen molecules split into hydrogen atoms that bond to the metal..
Enzyme Catalysis
fig 7.7 (a) - Lock and Key model of the interaction of substrate and enzyme. The active site of the enzyme alone is complementary in shape to that of the enzyme This model was proposed in the late 19 t h century. Since then, modern X-ray crystallographic and spectroscopic methods have revealed that..
fig 7.7 (a) - Lock and Key model of the interaction of substrate and enzyme. The active site of the enzyme alone is complementary in shape to that of the enzyme This model was proposed in the late 19 t h century. Since then, modern X-ray crystallographic and spectroscopic methods have revealed that..It is easier to open the door by applying force near the outer edge away from the hinges.
When we apply the force the door turns on its hinges. Thus a turning effect is produced when we try to open the door. Have you ever tried to do so by applying the force near the hinge? In the first case, we are able to open the door with ease. In the second case, we have to ..
Modals
Modals are verbs which 'help' other verbs to express a meaning: "modal verbs" have no meaning by themselves. A modal verb such as would has several varying functions; it can be used, for example, to help verbs express ideas about the past, the present and the future. " would is not just the pas..
What postulate of congruency can be applied to prove ΔABD≅&..
What postulate of congruency can be applied to prove Δ A B D ≅ Δ A C D from the following four postulates? 1.RHS 2.SAS 3.SSS 4.SAA => 1 or 2 or 2 or 3 or 1 or 2 or 4 or 1 or 3 or 4..
Question 8
Question: Why does a passenger standing in a bus move forward when the brakes are applied? Answer: A passenger standing in a bus move forward when the brakes are applied due to inertia of motion..
Conclusion
. Catalysis involves reactions where catalysts are used. Catalysts are used to accelerate the rate of reaction. Catalysts accelerate the rate of reaction by providing an alternate reaction pathway in which the activation energy is lower. Homogenous catalysis involves catalysts w..
Question 2
Question: If the current in a wire is flowing in the vertically downward direction and a magnetic field is applied from west to east, what is the direction of force on the wire? Answer: Applying Fleming's left-hand rule, force acting on the wire is towards sout..
Green Chemistry
Simply stated, Green chemistry is the use of chemistry for preventing environment pollution in order to protect human health. It may give the impression that it is branch of chemistry involving plants, which is not true. Green chemistry may be defined as the design of new chemical products and proc..
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