Flashcards in C4f Deck (7):
What is thermal decomposition?
-when a substance breaks down into at least two other substances when heated
What happens when you heat a transition metal carbonate?
-break down into metal oxide and carbon dioxide
-this usually results in a colour change
What are precipitations?
-when a solid forms in a solution
What is a precipitation reaction?
-where two solution react and an insoluble solid form in the solution
What happens if you react soluble transition metal compounds with sodium hydroxide?
-you get insoluble hydroxide
-which the precipitates out
How can you use precipitations to test for transition metal ions?
-some insoluble transition metal hydroxides have different colours
-you can use this fact to test which transition metal ions a solution contains
-e.g. adding sodium hydroxide to an unknown soluble salt may result in an orange/brown precipitation, you know you have got iron(III) hydroxide and so have Fe3+ ions in he solution