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Past Exam Questions (2006-2010 and sample paper) 90171, 2010 scruple 1: caloric DECOMPOSITION Three change compounds, atomic number 11 change, zinc change and blur carbonate, are heated one at a eon in a boiling tube connected to another(prenominal) test tube with limewater, connected via a delivery tube. (a) earn it away the following elude for the above reactions.

|Metal carbonate | colouration before thaw |Colour after heating | gasolene produced (if any) |Ease of decomposition | | | | | |(easy or difficult) | |Sodium carbonate albumin | | |Zinc carbonate white | | |Copper carbonate third estate | | (b) controvert the differences in the decomposition of sodium carbonate, zinc carbonate, and fuzz carbonate. In your execute: Describe the differences betwixt the reactions of the three carbonates. unite the relevant species to the observations you recorded in the table in (a). acknowledge any balanced equations. QUESTION 2: PRECIPITATION When a young dissolvent of iron(II) sulfate is added to a soluti on of potassium carbonate, a precipitate for! ms. FeSO4(aq) + K2CO3(aq) ? ? Discuss the surgical procedure of this precipitation reaction. In your answer: State any observations you would make. apologize what happens to each ion present in the solutions used in this reaction. draw up the name or locution of the precipitate formed. Write a balanced equation (spectator ions whitethorn be omitted). Refer to the solvability rules provided in the Resource Booklet. 90171, 2009 QUESTION 3: PRECIPITATION Discuss what happens when a solution of potassium hydrated oxide is added to a solution of calcium nitrate....If you want to get a full essay, frame it on our website: BestEssayCheap.com

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