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please help GCSE chemistry

ammonia reacts with oxygen in the presence of a metal oxide catalyst to produce nitrogen and water.
which metal oxide is most likely to be a catalyst for this reaction?
a) CaO
b) Cr2O3
c)MgO
d)Na2O
the answer is b but I don't understand why
have a think about the metals involved in the compounds
what type of elements are often used as catalysts?
Reply 2
Original post by bl0bf1sh
have a think about the metals involved in the compounds
what type of elements are often used as catalysts?


never mind i get why now thanks :smile:
please could you explain why
Original post by crochetnbooks
please could you explain why

Look at the groups the metals are in. That should give you the answer.
transition metals act as catalysts
Original post by butter fly
never mind i get why now thanks :smile:

Could you please tell me why too?
Original post by Elliezhou
Could you please tell me why too?

Transition metals, and transition metal compounds, are often good catalysts.

chemguide has a nice page about transition metals scroll down a bit and there's a section on catalytic activity:
https://www.chemguide.co.uk/inorganic/transition/features.html

And on catalysts in general:
https://www.chemguide.co.uk/physical/catalysismenu.html
https://www.chemguide.co.uk/physical/catalysis/introduction.html
You'll see that many of the examples of catalysts used are transition metals :smile:

Spoiler

Reply 8
Original post by bl0bf1sh
have a think about the metals involved in the compounds
what type of elements are often used as catalysts?

is it because cr is a transition metal?
Reply 9
Original post by bl0bf1sh
have a think about the metals involved in the compounds
what type of elements are often used as catalysts?

nvm i saw ur later message lol ty

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