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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: Lesliel1 on February 12, 2011, 11:52:32 am

Title: unit 1/2 chem.... hellppppp pleaseeee =(
Post by: Lesliel1 on February 12, 2011, 11:52:32 am

hiii
Im doing this prac where i put salts into a flame a record the colour and there is a question asking me:

suggest a reason why certain metals produce flame colours whereas other do not.

i cant find a reason at alll =(( dont they all produce colours? D=

thanks

Title: Re: unit 1/2 chem.... hellppppp pleaseeee =(
Post by: cltf on February 12, 2011, 12:10:16 pm

they do, except you can't see them all because of the colour spectrum and our eyes.

Title: Re: unit 1/2 chem.... hellppppp pleaseeee =(
Post by: pi on February 12, 2011, 12:12:47 pm

This is because of electrons moving to higher or lower energy levels and releasing varied amounts of energy.

Title: Re: unit 1/2 chem.... hellppppp pleaseeee =(
Post by: iNerd on February 12, 2011, 12:26:23 pm

Bohr's emission spectrum

Title: Re: unit 1/2 chem.... hellppppp pleaseeee =(
Post by: Mint on February 12, 2011, 12:32:28 pm

Because the wavelength may not correspond to one of the visible parts of the electromagnetic spectrum. Certain metals produce flame colours because the energy that they release corresponds to the visible coloured line on the spectrum. :)

I still have the prac from last year :P bhs right?

Title: Re: unit 1/2 chem.... hellppppp pleaseeee =(
Post by: Lesliel1 on February 12, 2011, 03:57:33 pm

Quote from: Mint on February 12, 2011, 12:32:28 pm

I still have the prac from last year :P bhs right?

omg omg omg! Mint you go to balwyn high too? omgggg! LOL so do i =D
hahha whats your name? =D
 hehehehehheehhehehehhehe

Title: Re: unit 1/2 chem.... hellppppp pleaseeee =(
Post by: luffy on February 12, 2011, 04:04:45 pm

As humans, we can only see certain colours because we can only see certain "wavelengths" of energy, shown in the electromagnetic spectrum. All metals will change the colour, but some cannot be seen by human eyes. Thus, certain metals will show a colour we can see and this is considered as a "flame colour" change. However, it is in fact, occurring with all the metals.