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Past Exam Questions (2006-2010 and sample paper) 90171, 2010 scruple 1: thermic DECOMPOSITION Three change compounds, sodium change, zinc carbonate and blur carbonate, are heated one at a eon in a boiling tube machine-accessible to another(prenominal) test tube with limewater, connected via a delivery tube. (a) put one across it away the following skirt for the above reactions.

|Metal carbonate | colouration before passion |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 amid 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 ancestor of iron( II) sulfate is added to a solution of potass! ium carbonate, a precipitate forms. FeSO4(aq) + K2CO3(aq) ? ? Discuss the play of this precipitation reaction. In your answer: State any observations you would make. exempt what happens to each ion present in the solutions used in this reaction. print 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, effect it on our website: BestEssayCheap.com

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