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Urgent Help for IGCSE Chem !

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Trinion:
If the compound decomposes, complete the word equation.
If it does not decompose, write "no reaction"

Potassium Hydroxide --->________________
calcium Hydroxide ----> ______________

Complete the equations for the decomposition of their nitrates:

2KNO3----> _____+_____
2Ca(NO3)3 -----> _____+_______+_______


Thanks in advance!

Ghost Of Highbury:
calcium hydroxide ----> Calcium oxide + water

Potassium hydroxide --> no reaction

Potassium nitrate --> Potassium nitrite + oxygen

Calcium nitrate --> Calcium oxide + nitrogendioxide + oxygen

Trinion:
Thank you very much!
Can you explain to me why Potassium Hydroxide has no reaction?

This stuff isn't even in the IGCSE syllabus but it came up last year!

Also, does a metal carbonate decompose to form the metal oxide+ carbon dioxide?

Edit: One more question. Do all group 1 and 2 metal ions form a colourless solution in water?
Is it the same for halogen and transitional metals ion?

Ghost Of Highbury:
potassium hyrdroxide is stable to heat thus doesnt decompose.  most alkali metal hydroxides do not decompose, except lithium hydroxide.

its dere in the IGCSE syl. check for "thermal decomposition"

and yes, metal carbonate --> metal oxide + CO

Ghost Of Highbury:
no not all , few metal ions form a white precipitate, green, blue etc. colorless solution is often formed when excess ammonia is added to zinc salt

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