Australia's Science Forum

Hi All,

This will still work, hotter climate over the year has caused discolouoration. But the reagent will still perform as it should.

Cheers,

Robb.....

Hi All,

If you are interested in having me place, at the beginning of each month, Night Sky Maps on the Chemtalk Forum let me know through this forum or my PM's and I will place organise these.

Cheers,

Robb.....

Hi All,

Cobalt Chloride soaked filter paper is a better option as this will allow you to use it in a range of applications.

Cheers,

Robb.....

Hi All,

This UV light will give off the correct wavelength required, and will have no lassting effects with exposure to it. Although I do recommend glasses if you are being exposed to it for lengthly periods (period after period). But safe in any other case.

Cheers,

Robb.

Hi All, red phosphorus will absorb water from the atmosphere, (Hydroscopic), and this will settle on top of the phosphorus giving it a wet layer. Over time this may dry but if the container is well sealed the opening it will not yield anything else but a bottle filled with phosphorus and a little wa...

Hi All,

This is a specialty chemical and will need to be specifically ordered in from a ruputable chemical supplier.

Expensive too...

Cheers,

Robb.....

Hi All,

Try the loudness of the a speaker system as you increas the distance away from the speaker source. Almost inverse square law..

Cheers,

Robb.....

Hi All,

I use a small sand trap, rake it level and start again.

Cheers,

Robb.....

Hi All,

Nickel Sulfate gives a green solid after evap.

Cheers,

Robb.....

Hi All,

An EUD will be required, chem suppliers will request something in writing and this should not be a problem. Just ask what they require you to answer and be straight forward.

Cheers,

Robb.....

Hi All,

Small amounts of absorbed water can also send the Lead Nitrate a little yellow.

Cheers,

Robb.....

Hi All, I hae completely forgot to tell you... So sorry. My private message to rainbowsky should have been that the end point for Screened Methyl Orange is Steel grey... (Faint Steel grey). This is the correct endpoint for the solution. It is a considerable change to what Methyl orange has. But for ...

Hi All, If for whatever reason Mercury needs to be left out in a small dish, simply pour a layer of water over it and it can then be safely left. When Merc then needs to be used pour off the water into a hazardous waste disposal bottle and use a tissue then to simply dry off the remainder of the wat...

Hi All,

Just wishing you all the very best for the International Year of Chemistry.

Have an enjoyable year!

Also for the duration of the year I am promoting the internation year of Chemistry with my Avatar reflecting this celebration.. Tell me what you think!!

Cheers,

Robb.....

Hi All,

Forgot again..... r stands for position vector.... in the equation velocity = r/t.

Cheers,

Robb.....

Hi All,

I appologise for my performance yesturday in answering the questions regarding r in my equations. Rho, rho has the symbol p.

I must have been on another planet or something.

Cheers,

Robb.....

Hi Ian, Indeed the r as mentioned in the linear equation is radius, the letter used in my representation is not rho as this is has the symbol (p). Thanks for the eagle eye my friend.... Don't know why I said that initially.. The new syllabus is just highly questionable. Cheers mate, Robb..... Hi Al...

Hi All,

Almost forgot...

The r in the equation in the syllabus comes fro the good old term for the following equation where 2 (pi) r/T this is Linear Velocity much more accurate than just v= s/t.

Hence why r starts to come into the picture. Oh and it this is called radius...

Hi All,

Hey Ian I was wondering where you were during all of this.....

Cheers,

Robb.....

Hi All,

I have coth bags for each sample, All are stored in alphabetical order with numbers corresponding to each group.

Cheers,

Robb.....