This website uses cookies to ensure you have the best experience. Learn more

Order Of Reaction / Rate Law

684 words - 3 pages

The order of a reaction is the power to which the concentration of a reactant must be raised to give the experimentally observed relationship between concentration and rate

The rate of a reaction depends in part on the concentrations of the reactants. For a reaction in which reactant A forms product B in one step, you can write a simple equation.

A→B

The rate at which A forms B can be expressed as the change in A (∆A) with time, where concentration A1 is the initial concentration of A at time t1 and concentration A2 is the concentration of A at a later time, t2.

Rate= - ∆A/∆t = -concentration A2 - concentration A1 / t2-t1

Because A, the reactant, is decreasing, the concentration of A is smaller at a later time than initially and so ∆A will always be negative. The negative sign in the expression is needed to make the rate positive, as all rates must be. The rate of disappearance of A is proportional to the concentration of A.

-∆A/∆t [A]

The proportionality becomes an equation with the insertion of a constant (k).

Rate = -∆A/∆t = k x [A]

This equation, called a rate law, is an expression for the rate of a reaction on terms of the concentration of reactants. The specific rate constant (k) for a reaction is a proportionality constant relating the concentrations of reactants to the rate of the reaction. The magnitude of the specific rate constant depends on the conditions of the reaction and is determined experimentally. The value of the specific rate constant, k, is large if the products form quickly; the value is small if the products form slowly.

The order of a reaction is the power to which the concentration of a reactant must be raised to give the experimentally observed...

Find Another Essay On Order of Reaction / Rate Law

Rate Of Reaction Investigation Essay

888 words - 4 pages Aim:To investigate the rate of reaction in different concentrations of acid using Magnesium strips.Prediction:I predict that the rate of reaction will increase as the concentration of acid increases. I know this because the collision theoryEquipment:* 15 Test Tubes* 1 Measuring Cylinder* Safety Goggles* 1 Test Tube Rack* 1 Stop Clock* Scissors* Ruler* Water basin* ScissorsReactants:The reactants I am going to use are:1.0M, 1.25M, 1.5M, 1.75M and

Rate of Reaction Using Enzymes Essay

3788 words - 15 pages Rate of Reaction Using Enzymes In this bit of coursework I will be investigating the rate of reaction in which enzymes are the catalyst breaking down a substrate. The substrate I am going to use is Hydrogen Peroxide (H2O2, water with another Oxygen), this molecule usually breaks down on its own accord, but also the rate of decomposition can be increased with the use of a catalyst; in this case the catalyst is a

What factors can affect rate of reaction?

819 words - 3 pages There are several factors which can affect the Rate of Reaction. These include:1) Temperature:At higher temperature, the particles have more kinetic energy. They move more rapidly through the solution, they collide more often and more vigorously, so the chance of a reaction increases. The time taken for a certain amount of collisions to occur decreases, so the overall time for the reaction to occur would also decrease. This will be counteracted

Effect of Temperature on Rate of Reaction of Catalase

906 words - 4 pages rate of reaction in itself. During the reaction substrate was used up which caused the reaction to slow to a halt after a while despite the fact that the enzymes were still functional, more substrate than was needed would have countered this and given true readings. Perhaps the most serious error in the whole experiment though was the fact that the gas expanded as the temperatures rose which would throw the results off completely. In order to counter this, the gas would need to be collected and cooled to room temperature in order to get perfectly accurately results.

The Effect of Temperature on the Rate of Reaction

1175 words - 5 pages The effect of temperature on rates of reaction Aim: The aim of this experiment is to find out if the reaction rate of sodium thiosulphate solution and hydrochloric acid will be affected by a temperature change. Prediction: I predict that as a result of increasing the temperature of the sodium thiosulphate, the rate of reaction will be faster. Because of the increase in temperature, the particles will gain more kinetic energy. This will

Investigating the affect of concentration on the rate of reaction

1168 words - 5 pages Investigating the affect of concentration on the rate of reactionIntroduction:This investigates how the rate of a chemical reaction depends on the concentration of reactants in the solution. This will be investigated with the following experiment in which dilute hydrochloric acid and sodium thiosulphate solutions are mixed. This forms insoluble sulphur and the mixture gradually becomes cloudy.If the concentration of the sodium thiosulphate

To study how concentration affects the rate of a reaction

1105 words - 4 pages The Collision TheoryFor particles to react, they must collide. They 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 of ReactionThe rate of a reaction depends on four things:*Temperature - When the temperature increases the particles start to all move quicker. This means that there will be more

Rate of reaction between Hydrochloric Acid and Calcium Carbonate

2874 words - 11 pages Rate of reaction between Hydrochloric Acid and Calcium Carbonate Calcium carbonate reacts with hydrochloric acid to form carbon dioxide gas. One way of following the rate of reaction at which it reacts is to measure the volume of carbon dioxide produced at certain time intervals during the reaction. CaCO + 2HCl CaCl + H O + CO =========================== Calcium Carbonate + Hydrochloric Acid Calcium Chloride + Water + Carbon Dioxide

The Rate Of Reaction Between marble Chips and Hydrochloric Acid

1396 words - 6 pages IntroductionWe are going to do an experiment to see how surface area effects the rate of reaction when added to hydrochloric acid. I will add calcium carbonate (marble chips) to hydrochloric acid.When calcium carbonate is added to hydrochloric acid a reaction takes place. The solution fizzes and gives off the gas carbon dioxide. I will collect this gas in a gas syringe and will time how long it takes for the reaction to produce 100cm3 of carbon

Biology AT1 'rate Of Reaction' Planing And Obtaining

687 words - 3 pages enzyme hitting a starch particle. When they do collide they link together and react so an increase in temperature causes a higher rate of enzyme reaction. Above about 60? enzymes begin to collapse causing them to be unreactive, it is said they are denatured.*PH: All enzymes must have the right conditions to work as, if the PH is either too acidic or too alkali then they become denatured and can no longer link with other chemicals. That is the reason

How Concentration and Temperature Affects the Rate of Reaction

804 words - 3 pages How Concentration and Temperature Affects the Rate of Reaction between Magnesium Ribbon and Hydrochloric Acid. WHAT I AM INVESTIGATING I am going to investigate how concentration and temperature affects the rate of reaction between magnesium ribbon and hydrochloric acid. MY PREDICTION The thing which I expect to happen is the more acid added to water the faster the reaction will happen. Also the hotter the solution the quicker

Similar Essays

To Determine The Rate Law Of A Chemical Reaction

434 words - 2 pages Aim: To determine the rate law of chemical reactionsIntroduction: The aqueous solution of potassium peroxydisulphate can oxidize potassium iodide as follow:Equation:K S 0 (aq) + 2KI (aq)->2K S0 (aq)+I (aq)2 2 8 2 4 2KI(aq) +I (aq) -> KI (aq)2 3_________________________________________________K S 0 (aq) +3KI(aq) -> 2K S0 (aq)+ KI (aq)2 2 8 2 4 2The rate law of this reaction can be represented as follow:Rate=k[S208 2-]^a [I-]^bWhen the

The Rate Law For Chemical Reaction Among Hydrogen Peroxide, Iodide, And Acid

3073 words - 12 pages of chemical kinetics, the subject of this experiment. In this experiment we will study the rate of oxidation of iodide ion by hydrogen peroxide which proceeds according to the following reaction: H2O2 (aq) + 2 I-(aq) + 2H+(aq) I2(aq) + 2H2O(l) By varying the concentrations of each of the three reactants (H2O2, I- and H+), we will be able to determine the order of the reaction with respect to each reactant and the rate law of the

Rate Of Reaction Coursework Essay

532 words - 2 pages Rates of Reaction A chemical reaction can only occur between particles when they collide (hit each other). Particles may be atoms, ions or molecules. There is a minimum amount of energy which colliding particles need in order to react with each other. If the colliding particles have less than this minimum energy then they just bounce off each other and no reaction occurs. This minimum energy is called the activation energy. The

Rate Of Reaction Coursework Essay

1198 words - 5 pages Investigate if changing the concentration of an acid will change the rate of the reaction when marble is dissolved in hydrochloric acid. Apparatus Marble Chips Conical Flask Hydrochloric Acid Gas Syringe Delivery Tube Stop Watch Fair Test To make the experiment a fair test I will use the same amount of acid for each concentration. I will do this by using a capillary tube because they are very accurate. I will use 3g of marble in each