Essays Tagged: "Activation Energy"

Examining Some Properties of the Enzymatic Reaction

ng the reaction. Enzymes, catalysts in biochemical reactions, are globular proteins which lower the activation energy needed to begin a reaction and therefore increase the rate at which efficient reac ...

(3 pages) 62 0 4.6 Dec/2002

Subjects: Science Essays > Biology

The Advantages of using Enzymes in Biotechnology.

nzyme is a protein, which is able to catalyse biochemical reactions. Reactions need to exceed their activation energy in order to take place. Enzymes reduce the need for activation energy and so allow ...

(5 pages) 71 0 3.0 Apr/2003

Subjects: Science Essays > Biotechnology

Chemestry on sodiumthiosulphate turning hydrochloric acid milk.

nge takes place on collision, the colliding molecules must have a minimum kinetic energy called the Activation Energy. This is shown on the energy level diagrams below. It does not matter whether the ... when heated molecules have a greater kinetic energy, greater proportions of them have the required activation energy to react. The increased chance of higher energy collisions greatly increases the s ...

(12 pages) 40 0 3.0 Jul/2003

Subjects: Science Essays

Investigating Some Factors Which Affect the Rate of Reaction.

ore particles colliding with enough energy to make the reaction happen. This energy is known as the activation energy and is needed to break initial bonds. Raising the temperature by 10ºC causes ... al change or which can be recovered when the chemical reaction is completed. It lowers the level of activation." A catalyst works by giving the reactants particles a surface, which it can stick to and ...

(3 pages) 69 0 4.8 Oct/2003

Subjects: Science Essays > Chemistry

Chemistry, the effects of acid rain includes experiment with marble chips.

collide more often and with more energy. Particles with more energy are more likely to overcome the activation energy barrier to reaction and thus react successfully. If solutions of reacting particle ... after colliding. The minimum energy that a particle must have to overcome the barrier is called the activation energy, or Ea. The size of this activation energy is different for different reactions. I ...

(2 pages) 29 0 3.0 Nov/2003

Subjects: Science Essays

To study how concentration affects the rate of a reaction.

hey must also collide with enough energy for a reaction to take place. The energy created is called activation energy. The more often and faster the chemicals collide, the stronger the reaction.Rate o ... - A catalyst gives the reacting particles a surface to stick to and still collide. This lowers the activation energy, making it easier for the reaction to take place. A catalyst does not take place i ...

(4 pages) 51 0 2.2 Mar/2004

Subjects: Science Essays > Chemistry

Enzymes and Their Properties

sms. A catalyst is a substance that speeds up reactions without the addition of heat; decreases the activation energy needed for the reaction to take place by bringing molecules in contact with each o ...

(1 pages) 51 0 0.0 May/2004

Subjects: Science Essays > Biology

Investigation to see the effects of increasing the surface area of a potato when mixed with Hydrogen Peroxide.

arrying kinetic energy, and by carrying more kinetic energy the chance of the reaction to reach its activation energy is more higher and therefore creates more successful collisions and by making more ... ,2) more of the collisions result in a reaction between particlesbecause the catalyst can lower the activation energy for the reaction. Although they are all very specific, as each enzyme just perform ...

(7 pages) 15 0 0.0 Feb/2006

Subjects: Science Essays > Biology

How and why do enzymes work?

action's speed), by reducing the amount of energy required to activate the reacting molecules - the activation energy.Enzymes are very important, and if they were not present, life as we know it would ... oxide per second. Like every other enzyme, catalase speeds up the reaction be lowering the required activation energy. If the hydrogen peroxide was not broken down quickly, (e.g. there was no catalyst ...

(2 pages) 23 0 0.0 Mar/2006

Subjects: Science Essays > Biology

The effect of concentration of enzyme and enzyme substrate on the rate of an Enzyme-catalysed reaction

peed up a chemical reaction while not being transformed in that reaction. They work by lowering the activation energy of a chemical reaction. In order to bring to reactants together, energy has to be ... osition of hydrogen peroxide into oxygen and water. This works as followed: The catalase lowers the activation energy of the chemical reaction. In order to bring the reactants together, energy has to ...

(13 pages) 84 0 0.0 Mar/2006

Subjects: Science Essays > Biology

Specificity and Catalytic Effectiveness of Enzymes

the reaction. The molecules, which an enzyme reacts with, are called substrate. Enzymes reduce the activation energy needed for a reaction. An active site is the specific portion of an enzyme that at ... n enzyme that attaches to the substrate by means of weak chemical bonds. Active sites can lower the activation energy of the reactants by providing suitable microenvironment, by binding to the substra ...

(1 pages) 22 0 0.0 Apr/2006

Subjects: Science Essays > Biology

G.C.S.E chemical reaction - rates of reaction between sodium thiosulphate solution and hydrochloric acid.

change; these are called "successful collisions". The successful collisions have sufficient energy (activation energy - Ea) at the moment of impact to break the existing bonds and form new bonds, resu ... of the reactant particles, but also the fraction of particles having kinetic energy higher than the activation energy. Thus the effective collision frequency increase.EvaluationDuring the course of th ...

(8 pages) 78 0 5.0 May/2006

Subjects: Science Essays > Chemistry

Catalysts In Industries

A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy without itself undergoing any change. Catalysts make it easier for the reactions t ...

(3 pages) 48 0 3.8 Jun/2006

Subjects: Science Essays > Chemistry

The environmental factors that effect turnip peroxidase

e turnip peroxidase. Enzymes are biological catalysts which increase reaction rates by lowering the activation energies of substrates. A substrate is a reactant that interacts with the enzyme. The enz ... ic things that change their shape so all these substrates (reactants) can become catalyzed when the activation energy is lowered and the reactions happen a lot faster. Sometimes in cells though it may ...

(8 pages) 124 0 3.7 Oct/2006

Subjects: Science Essays > Environmental Science


zymes bind to specific substrates. An enzyme is unchanged by the reaction and can be reused, lowers activation energy needed by the cell, and the substrate along with the enzyme bind to the active sit ...

(2 pages) 11 0 0.0 Feb/2008

Subjects: Science Essays > Biology

Pepsin Experiment

hemical involved in, but not changed by, a chemical reaction. Many enzymes function by lowering the activation energy in reactions. By bringing the reactants closer together, chemical bonds may be wea ...

(5 pages) 11 0 3.0 Feb/2008

Subjects: Science Essays > Chemistry

Observing Protein and Non-protein Catalysts Under Different Conditions

act as enzymes in reactions of the body1.Enzymes are biological catalysts that lower the amount of activation energy needed in carrying out biochemical reactions1. Enzymes are responsible for almost ...

(5 pages) 16 0 0.0 Apr/2008

Subjects: Science Essays > Biology

Determining the Influence of pH on the Activity of Catalase Enzyme in Potato Tuber Cells

substance, produced in living organisms, which speeds up a certain reaction, because it lowers the activation energy. Activation energy is the amount of energy, which is needed for the reaction to st ...

(9 pages) 18 0 5.0 Jan/2009

Subjects: Science Essays > Biology

Biology: Experiment- The Effect of Temperature on the Enzyme Rennin

cur substances must collide with the correct orientation and necessary amount of energy, called the activation energy. The role of the enzyme is to lower the activation energy which therefore allows c ...

(8 pages) 25 1 0.0 May/2009

Subjects: Science Essays > Biology

Year 12 Chemistry: Production of Materials. Ethanol Research Task

atalyst and dehydrating agent. A catalyst is needed in order to speed up the reaction and lower the activation energy required for the reaction to take place.H+CH3CH2OH(l) → CH2CH2(g) + H2O(l) ... catalyst and hydrating agent. A catalyst is needed in order to speed up the reaction and lower the activation energy required for the reaction to take place. An acid catalyst is required because the ...

(7 pages) 15 0 0.0 Jun/2010

Subjects: Science Essays > Chemistry