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Investigation into the Reactivity of Metals.

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Introduction

Investigation into the Reactivity of Metals Introduction: In this investigation I have been given a set of results therefore I will not conduct the experiment. However, before I receive the results of the experiment, I am going to make a prediction. After I have made my prediction and received my results I will draw a graph from the results, write up a conclusion and then evaluate the results. Prediction: I predict that the four metals of this experiment will come in this order: 1. Calcium 2. Magnesium 3. Zinc 4. Iron I made this prediction on the knowledge that I have that the reactivity of any element depends on the size of the atom (this is the number of shells) and the number of electrons on the outer shell. This therefore means that the more shells an atom has, the more reactive it is. An example of this: Group II metals Calcium Magnesium Beryllium 2,8,8,2 2,8,2 2,2 Using the previous example (previous page) it can be said that the further away the electrons are from the nucleus, the easier the electrons can be lost. If calcium is compared to magnesium, it can be seen that the outer electrons in calcium are further away from the nucleus, which in turn means that calcium is more reactive than magnesium. ...read more.

Middle

It then remains at 23�c and stays at this temperature until the full time investigated is completed. Zinc- The temperature starts at 22�c and very slowly increases over the remaining of the time. After 540 seconds, the temperature went only up to 28�c. From the results, it can be concluded that Zinc is more reactive than iron. All of the evidence (results, graph and scientific proof) supported my prediction and based on this I have arranged the metals in this order, starting with the most reactive: 1. Calcium 2. Magnesium 3. Zinc 4. Iron The results match my prediction and I had expected this to happen. I had previously justified that calcium is more reactive than (electrons theory) and so I expected these two elements to be the most reactive. I had also done some previous research on iron and zinc in which I had found out that zinc is more reactive than iron. So I then knew that these two would follow calcium and magnesium. Evaluation: The procedures, which were carried out in this experiment, were not very good, but the results obtained are accurate and they do support my prediction. They show that calcium is more reactive than magnesium, magnesium is more reactive than zinc and zinc in turn is more reactive than iron. ...read more.

Conclusion

For calcium: E.g. calcium + magnesium chloride = calcium chloride + Magnesium Calcium + zinc chloride = calcium chloride + zinc Calcium + iron chloride = calcium chloride + iron As calcium is the most reactive out of the four metals, it displaces them ( pushed them out and took their place). Where as, if iron were to be added to calcium chloride, magnesium chloride or zinc chloride there would be no reaction because zinc is the least reactive out of those four metals (zinc, iron, magnesium and calcium). E.g. Iron + calcium chloride = iron + calcium chloride (no reaction). Iron + magnesium chloride = iron + magnesium chloride (no reaction). Iron + zinc chloride = iron + zinc chloride (no reaction). The displacement reaction experiment could also be used with other metals to find out their reactivity. An experiment involving water could also be done to find out the reactivity of these four metals. Calcium would fizz, less than a Group I metal but more than magnesium (even though it would take a long time). The same principle applies to zinc and iron. When added to water, they would both be significantly slower to react than Group I and Group II metals, but zinc would be more reactive than iron. Having looked at all of the evidence, (results, graph and scientific proofs) I have arranged the metals in this order, starting with the most reactive: - Calcium - Magnesium - Zinc - Iron ...read more.

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