Engr. Imelda Galera
De La Salle University-Dasmariñas
Dasmariñas, Cavite Philippines
Chemical periodicity was demonstrated using different samples of elements from Group IA, IIA and IVA. These samples are: Li2CO3, Na2CO3, K2CO3, MgCO3, CaCO3, BaCO3, Carbon, Tin, Silicon and Lead. Each sample was placed in a test tube, (one sample and one test tube) and the physical color, appearance and state was defined. Water was used to test the solubility of the element. We use blue and red litmus paper to test the Metal Oxides in Group IIA. A balanced Chemical equation was written to show the reaction between oxides and water.
Periodicity, generally related to the so call "invention" of the Periodic Table. In that table, Mendeleev arranges elements according to their molecular mass into rows and columns. And amazingly, those in the same columns have similar properties. However, at the time Mendeleev invented the table, there is a few elements. So he named "missing" elements (in other words, cells) in the table and predicted their properties... Periodicity, in terms of Chemistry is the properties of elements that, if you know where it is in the Periodic Table, you can actually "predict" its properties without actually trying to find them out yourself.
MATERIALS AND METHODS
For the Group IA & IIA Elements, each small amount samples of Li2CO3, Na2CO3, K2CO3, MgCO3, CaCO3 and BaCO3 was place in the different test tubes. After placing them in the test tubes, we identified the physical state, color, and appearance of each. Then we test the solubility of each sample by using water.
For the Group IVA Element, each small amount samples of C, Sn, Si, and Pb was placed in different test tubes. Then its physical state, color and appearance were identified.
For Group IIA Metal Oxides, a small amount sample of MgO and CaO was placed indifferent test tubes. 10 ml H2O was added...
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