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An aqueous solution contains barium iodide.It is possible to obtain a solution that contains Ba2+(aq) but no I–(aq) by adding ……1…… until nomore ……2…… precipitate forms.Which words correctly complete gaps 1 and 2?1 2A aqueous lead(II) nitrate whiteB aqueous lead(II) nitrate yellowC dilute sulphuric acid whiteD dilute sulphuric acid yellowhelp please...need an explanation..
this is from may 05, if anyone has solved it, pls help me.for question 16, the answer is Dy cnt it b C? pls help, thanks in advance
Quote from: john12345 on June 10, 2009, 04:46:40 pmnd one more questionwhich process can convert molecules to a new substance by removing hydrogen atomsA displacementB fermentationC neutralisationD oxidationhow do you solve this questionjohn it is oxidation By the way it is not der 4r us it cums in O-levels loss of hydrogen is oxidation
nd one more questionwhich process can convert molecules to a new substance by removing hydrogen atomsA displacementB fermentationC neutralisationD oxidationhow do you solve this question
Quote from: esso on June 11, 2009, 02:34:49 pmAn aqueous solution contains barium iodide.It is possible to obtain a solution that contains Ba2+(aq) but no I–(aq) by adding ……1…… until nomore ……2…… precipitate forms.Which words correctly complete gaps 1 and 2?1 2A aqueous lead(II) nitrate whiteB aqueous lead(II) nitrate yellowC dilute sulphuric acid whiteD dilute sulphuric acid yellowhelp please...need an explanation..U omit C and D first cuz if u want barium ions in the solution that reacting it with acid gives sulphate which is not soluble.Since u want barium ions to be in the solution, u want iodide to precipitate so that it can be filtered. So u add Lead nitrate and this will react with barium iodide to give barium nitrate and lead iodide(which is yellow). lead iodide can be filtered as it is insoluble and will precipitate. the solution will contain no iodide ions. I hope it's clear...
Quote from: aquarian93 on June 11, 2009, 02:42:13 pmthis is from may 05, if anyone has solved it, pls help me.for question 16, the answer is Dy cnt it b C? pls help, thanks in advanceFor 3, there would be no loss in mass, as any gas produced would remain inside the conical flask, and not be able to excape through the stopper.
Guys please help with this,...When lithium reacts with water, if forms lithium oxide + hydrogen OR it forms lithium hydroxide + hydrogen?And which metals react with water to form metal oxide + hydrogen and which ones react with water to form metal hydroxide + hydrogen???Help please???
Quote from: i-insane on June 11, 2009, 02:44:24 pmQuote from: aquarian93 on June 11, 2009, 02:42:13 pmthis is from may 05, if anyone has solved it, pls help me.for question 16, the answer is Dy cnt it b C? pls help, thanks in advanceFor 3, there would be no loss in mass, as any gas produced would remain inside the conical flask, and not be able to excape through the stopper. yea bt if it dusnt escape, u can still use it cuz the mass will increase as gas is produced and wont escape. da mass will increaserite?