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Chemistry report - The aim of this practical is to observe the difference in the reactivity between Mg and Ca when hot and cold water is added.

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Introduction

Reactivity of Mg and Ca Introduction The aim of this practical is to observe the difference in the reactivity between Mg and Ca when hot and cold water is added. Hypothesis We think they will react in some kind of form. Variables The independent variable was the temperature of the water and also the quantity of metal use in the experiment and the dependent variable was the reaction. Equipment * Mg (s) * Ca (s) * Phenolphthalein * Beaker * Cold and hot water * Sandpaper * Test tubes with rack Procedure 1. ...read more.

Middle

5. Water was heated over a Benson burner and poured into the two test tubes without water while observing the reactions. 6. Two droplets of phenolphalein were added in each of the test tubes filled with cold water to observe the change in ph. Observation Relative reactivity of Cold water Hot water Mg There was a minimum reaction. Fig. 1 There is a bigger reaction than with the cold water. Fig. 2 Ca The temperature of the water increases right away. Before we dropped the phenolphthalein the solution was white, fig.3, but after adding the phenolphthalein it turned pink, fig.4, which means that the reaction is basic. ...read more.

Conclusion

In this case the atom that has more orbits is the calcium that is why it reacts more than the magnesium because calcium needs less energy to give electrons away. And the magnesium didn't react much because it needs more energy that the one that we gave it. Write the balanced equation for the reaction between Mg and H2O: Mg (s) + H2O (l) MgO (s) + H2 (g) Uncertainties Other element might have been present. The hot water might have been heated more. Conclusion We learned that both magnesium and calcium is basic solutions because of the pink tint to the color. We also learned that calcium reacted faster than magnesium. ?? ?? ?? ?? 10.11.11 nr.3 Inga and David ...read more.

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