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The position of different metals in the reactivity series and their effect on activation energy

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Introduction

The position of different metals in the reactivity series and their effect on activation energy I have chosen this investigation because the reactivity of a metal is related to its activation energy. However am not sure what the effect is .but I believe that a more reactive metal will have a lower activation energy this is because the metal is reactive therefore will not need a high amount of energy Plan of investigation To test out my problem I will be conducting a suitable investigation. I will be reacting different metals with dilute hydrochloric acid; this reaction provides me with hydrogen gas .with this method I will measure how long it will take to produce 40cm3 of gas for every metal. Afterwards I will plot a graph showing how long it takes every metal to produce 40 cm3 of hydrogen gas. Then to work out the activation energy I will plot a graph like the one below for each metal. The graph will be lnk against 1/t(kelvins).where 1/t(kelvins) is the temperature used +273 which changes it to kelvins .the lnk is the ln(1/t) where t denotes time .if only 2 readings of temperature are obtained for any reason then the equation of Ln(R1-R2)=-Ea/R(1/T1-T2) ...read more.

Middle

> -Catalysts Energy activating tools -the energy activating tools includes hormones enzymes and catalysts which indirectly control the energy of activation to overcome the sack bags in the reaction. > -pH of system A normal level of PH is significant for normal reaction .if the PH is undergoing change the reaction will be badly affected even if all the other conditions are completely fulfilled . > -ionic state of the system > Ionic state of matter is important to favour the reaction as compared to non ionic state because the ionic state makes the reaction faster and quicker. > -area of system provided The area and size of the particles are highly effective in the reaction, the particle with smaller size in the form of powder are more reactive as compared to the crystal form of substance. The studying of rate of reaction is very important. Rate of a reaction is the change in concentration of reactant to products and vice versa in a given time. Rate is the change of reactant to products in unit time. Time factor is very significant in determining the completion of reaction. The rate of reaction can be affected by many important factors, namely temperature, concentration of reactants (or pressure for gases) presence of catalyst or surface area of solid substances. ...read more.

Conclusion

concentration time -1 For order zero the rate coefficient has the units mol dm-3s-1 First order reactions In first order reaction the rate is proportional to the concentration. If the reaction A=Products Is first order the rate equation will be Rate= k [A] Since the rate is proportional to concentration of A when half of A has reacted the rate will be half the initial rate. When three quarters of a have reacted the rate will be one quarter of the initial rate. The graph of A against time is shown below in the graph for a first order reaction .there is a curve because the time it takes for the concentration of the reactant to be halved (the half-life) is constant whatever the concentration. Second order reactions Graphs for second order reactions are a curve but much deeper than first order one and the half life is not constant it will increase dramatically as reaction proceeds. The units of the rate coefficient depend on the global order of reaction: * For order zero, the rate coefficient has units of mol dm-3s-1 * for order one the rate coefficient has units of s-1 * For order two the rate coefficient has the units mol-1dm3s-1 For order n the rate coefficient has the units of mol 2-n dm6-3ns-1 ...read more.

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