Transition metals, what examples should I know? [aqa gcse]

I'm in y11 studying for aqa gcse chem and am predicted to do well but I feel like there's some things I'm unsure of for if i should know or not cause the exam specification is kind of vague about it and was wondering if anyone has any specific advice on it.

Under transition metals for example it says 'Students should be able to exemplify these general properties by reference to Cr, Mn, Fe, Co, Ni, Cu.'

I was wondering if anyone knows how many examples for different properties I should realistically know for these elements [mainly of the ions they form, melting points, and the coloured compounds they form].

Reply 1

Nitrotoluene

Original post

by tma0102

I'm in y11 studying for aqa gcse chem and am predicted to do well but I feel like there's some things I'm unsure of for if i should know or not cause the exam specification is kind of vague about it and was wondering if anyone has any specific advice on it.
Under transition metals for example it says 'Students should be able to exemplify these general properties by reference to Cr, Mn, Fe, Co, Ni, Cu.'
I was wondering if anyone knows how many examples for different properties I should realistically know for these elements [mainly of the ions they form, melting points, and the coloured compounds they form].

Focus on the most important details rather than trying to learn every nuance. Copper is typically bivalent Cu^2+ in most situations. The Cu^+ version is rare. Iron is bivalent Fe^2+ or trivalent Fe^3+ practically all the time. For their coloured compounds, remember that bivalent iron ispale green. Bivalent copper is blue. Trivalent iron is orange or brown. High melting point is due to metallic bonds. Iron and copper are often in questions. This means you should study them first.
Ciao,
Sandro

Reply 2

TypicalNerd

Original post

by tma0102

I'm in y11 studying for aqa gcse chem and am predicted to do well but I feel like there's some things I'm unsure of for if i should know or not cause the exam specification is kind of vague about it and was wondering if anyone has any specific advice on it.
Under transition metals for example it says 'Students should be able to exemplify these general properties by reference to Cr, Mn, Fe, Co, Ni, Cu.'
I was wondering if anyone knows how many examples for different properties I should realistically know for these elements [mainly of the ions they form, melting points, and the coloured compounds they form].

At GCSE, you’ll usually be told which ion is formed, given transition metals are strange and have variable oxidation states (which is a fancy way of saying the can form several ions with different charges). I’d also note that transition metals and their compounds often make good catalysts, which for now is best accepted as fact, but it does tie into the variable oxidation states property mentioned (as you will see if you take A level chemistry). The only examples of catalysis I’d bother to memorise are Ni for hydrogenation in the manufacture of margarine and Fe in the Haber process.

I’d make sure to look into metallic bonding. It gives rise to a number of typical properties of these elements (e.g. malleability, electrical conductivity and high melting points). The malleability is a matter of the layers of the giant lattice being able to slide over one another, conductivity is due to delocalised electrons acting as moving charges and the high melting points come from the strong electrostatic attraction between the metal cations and delocalised electrons requiring a lot of thermal energy to overcome.

I’d just accept that they typically form coloured compounds as fact and not go much further than that (that’s going into A level territory). Memorising the colours the ions typically have is more of an A level detail, but it might be worth memorising that copper(II) is blue (though anhydrous CuSO4 is white - it turns blue on contact with water, which makes it a good means of testing for water) and that iron(III) is typically orange/brown.

Another property it might be nice to take note of is the fact that these metals only ever form positive ions - i.e. they are oxidised in reactions with nonmetallic substances. This makes them reducing agents.

(edited 1 month ago)

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Transition metals, what examples should I know? [aqa gcse]

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