Stevejonesybobboy

Past Exam Questions (2006-2010 and sample paper) 90171, 2010 scruple 1: thermic DECOMPOSITION Three change compounds, atomic number 11 change, zinc change 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) allow it away the following table for the above reactions.

|Metal carbonate | colouration before hotness |Colour after heating | gasolene produced (if any) |Ease of decomposition | | | | | |(easy or difficult) | |Sodium carbonate albumin | | |Zinc carbonate white | | |Copper carbonate third estate | | (b) reason the differences in the decomposition of sodium carbonate, zinc carbonate, and fuzz carbonate. In your execute: Describe the differences between 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 solving of iron(II) sulfate is added to a solution of potassium! carbonate, a precipitate forms. FeSO4(aq) + K2CO3(aq) ? ? Discuss the abut of this precipitation reaction. In your answer: State any observations you would make. pardon what happens to each ion present in the solutions used in this reaction. hold open 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, decree it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay