ELEKTROKIMIA-factors that affect....

Minggu ni cikgu akan habiskan electrolisis dalam larutan akues dan juga faktor yang mempengaruhi elektrolisis larutan akues. Nota boleh dimuat turun di sini.

Di bawah ini ada lagu yang menarik tentang elektrolisis. Kita boleh translatekan lagu ini kepada bahasa Melayu untuk memudahkan fahami maksud elektrolisis.

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Cleansing Action of Soap Preparation of Soap

- Energy Level Diagram is a graph that shows the energy change of a chemical reaction ( graf yang menunjukkan perubahan tenaga dalam tindak balas kimia ) • The energy change can be presented by using a n energy level diagram . (perubahan tenaga boleh diwakili menggunakan rajah aras tenaga) l Energy change, Δ H = energy bond breaking + bond formation l In exothermic reaction, - the heat released from the bond formation is greater than the heat absorbed for bond breaking . - A negative sign for Δ H shows that heat is released l In endothermic reaction, - the heat absorbed from the bond breaking is greater than the heat released for bond forming.

TERMOKIMIA -HEAT OF REACTION

Method of Calculating Δ H a ) Quantity of heat change in a substance depends on ( kuantiti perubahan haba bg sesuatu bahan bergantung kepada ): i - Mass of substance (m in grams) ii- Specific heat capacity of a substance (c in Jg -1 o C -1 ) iii- Temperature change ( θ in o C ) b) As chemical reaction occurs in an aqueous solution, assumptions are made during the calculation of heat of reaction : Density of aq solution = Density of water = 1 g cm -3 Density of aq solution = Density of water = 1 g cm -3 Example : - 1 cm 3 of aq solution has a mass of 1 g - 2 cm 3 of aq solution has a mass of 2g Specific heat capacity of solution = Specific heat capacity of water = 4.2 Jg -1 o C -1 The heat of reaction can be calculated by using formula Energy change, H = mc θ Four type of heat of reaction : 1) Heat of precipitation - Heat of precipitation is heat change when 1 mole of precipitate is formed from its ions. 2) Heat of displacement - Heat of displacem...

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