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In the reaction why does the oxygen gas go from a gaseous state to a solid ?

Ohhh that makes sense. Thanks :)

Why does oxygen gain 4 electrons though (sorry I still don't get it)

So for oxygen wouldn't the reduction equation just be: O2+ + 2e- -> O2- Why do u multiply everything again by 2

Can someone write out how the half equations for oxygen + calcium, should look like. Thankyou^^

That's true . A top school . Not selective tho

I guess its good for practice anyways. People in the same yr as me know this stuff as well. Their school has already taught them all of this

I do not remember doing any of this in the metals topic, what syllabus point is this Here is a pic of the dot point:

ohh , I have been writing the half equations out and then adding them. Can u post what the half equations should look like?

So for writing the net ionoc equation for oxygen + calcium, I got everything right except at the end of the equation on the products side it is Ca2+(aq) + O2-(s) Why is it O^2- and not just O2

Thnx:D

Q. how to balance reaction of zinc and water

Its a component of the metals topic in yr 11

Wait, I just realised you added another example. is that a metal+acid= metallic acid + hydrogen gas form

Haha that's okay, I like challenging questions . I am trying to practice these things, so I don't suffer when start chem. I have a really bad chem teacher

interesting. Is this a yr 11 standard question or actual yr 12 chem?

can I have a hint about the ionic equation?

Okay , I'll do it now

Anymore practice questions? Is this also hsc content?

yes thankyou, I realised that after I posted it haha