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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


Name some transition metal hydroxides and their colours.

-copper(II) hydroxide=blue solid
-iron(II) hydroxide=green/grey solid
-iron(III) hydroxide=orange/brown solid