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.....
Search found 623 matches
- 18 Mar 2011, 09:21
- Forum: Safety with Chemicals
- Topic: potassium iodide
- Replies: 3
- Views: 2156
- 24 Feb 2011, 11:41
- Forum: Announcements
- Topic: Night Sky Monthly Maps
- Replies: 7
- Views: 2878
Night Sky Monthly Maps
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.....
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.....
- 24 Feb 2011, 11:37
- Forum: Recipes and Pracs
- Topic: Cobalt chloride
- Replies: 12
- Views: 4055
Re: Cobalt chloride
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.....
Cobalt Chloride soaked filter paper is a better option as this will allow you to use it in a range of applications.
Cheers,
Robb.....
- 23 Feb 2011, 10:18
- Forum: Biology, Physics...
- Topic: UV lights
- Replies: 2
- Views: 1790
Re: UV lights
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.
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.
- 21 Feb 2011, 09:46
- Forum: Safety with Chemicals
- Topic: red phosphorous
- Replies: 8
- Views: 2874
Re: red phosphorous
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...
- 17 Feb 2011, 10:03
- Forum: Chemistry and Labware - General
- Topic: screened methyl orange colour chart?
- Replies: 15
- Views: 9546
Re: screened methyl orange colour chart?
Hi All,
This is a specialty chemical and will need to be specifically ordered in from a ruputable chemical supplier.
Expensive too...
Cheers,
Robb.....
This is a specialty chemical and will need to be specifically ordered in from a ruputable chemical supplier.
Expensive too...
Cheers,
Robb.....
- 17 Feb 2011, 10:01
- Forum: Recipes and Pracs
- Topic: Physics prac
- Replies: 5
- Views: 1973
Re: Physics prac
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.....
Try the loudness of the a speaker system as you increas the distance away from the speaker source. Almost inverse square law..
Cheers,
Robb.....
- 13 Feb 2011, 19:57
- Forum: Biology, Physics...
- Topic: projectile launcher landing pad
- Replies: 11
- Views: 4481
Re: projectile launcher landing pad
Hi All,
I use a small sand trap, rake it level and start again.
Cheers,
Robb.....
I use a small sand trap, rake it level and start again.
Cheers,
Robb.....
- 13 Feb 2011, 19:51
- Forum: Chemistry and Labware - General
- Topic: Coloured Solutions for boiling
- Replies: 4
- Views: 2122
Re: Coloured Solutions for boiling
Hi All,
Nickel Sulfate gives a green solid after evap.
Cheers,
Robb.....
Nickel Sulfate gives a green solid after evap.
Cheers,
Robb.....
- 13 Feb 2011, 19:49
- Forum: Safety with Chemicals
- Topic: red phosphorous
- Replies: 8
- Views: 2874
Re: red phosphorous
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.....
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.....
- 13 Feb 2011, 19:45
- Forum: Safety with Chemicals
- Topic: LEAD NITRATE
- Replies: 34
- Views: 16193
Re: LEAD NITRATE
Hi All,
Small amounts of absorbed water can also send the Lead Nitrate a little yellow.
Cheers,
Robb.....
Small amounts of absorbed water can also send the Lead Nitrate a little yellow.
Cheers,
Robb.....
- 13 Feb 2011, 19:42
- Forum: Chemistry and Labware - General
- Topic: screened methyl orange colour chart?
- Replies: 15
- Views: 9546
Re: screened methyl orange colour chart?
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 ...
- 13 Feb 2011, 19:29
- Forum: Safety with Chemicals
- Topic: elemental mercury
- Replies: 11
- Views: 3971
Re: elemental mercury
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...
- 28 Jan 2011, 19:18
- Forum: Announcements
- Topic: International Year of Chemistry
- Replies: 2
- Views: 1758
International Year of Chemistry
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.....
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.....
- 29 Oct 2010, 09:18
- Forum: Biology, Physics...
- Topic: velocity v=s/d what's the s stand for?
- Replies: 20
- Views: 7662
Re: velocity v=s/d what's the s stand for?
Hi All,
Forgot again..... r stands for position vector.... in the equation velocity = r/t.
Cheers,
Robb.....
Forgot again..... r stands for position vector.... in the equation velocity = r/t.
Cheers,
Robb.....
- 29 Oct 2010, 08:59
- Forum: Biology, Physics...
- Topic: velocity v=s/d what's the s stand for?
- Replies: 20
- Views: 7662
Re: velocity v=s/d what's the s stand for?
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.....
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.....
- 29 Oct 2010, 08:25
- Forum: Biology, Physics...
- Topic: velocity v=s/d what's the s stand for?
- Replies: 20
- Views: 7662
Re: velocity v=s/d what's the s stand for?
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...
- 27 Oct 2010, 14:09
- Forum: Biology, Physics...
- Topic: velocity v=s/d what's the s stand for?
- Replies: 20
- Views: 7662
Re: velocity v=s/d what's the s stand for?
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...
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...
- 27 Oct 2010, 13:54
- Forum: Biology, Physics...
- Topic: velocity v=s/d what's the s stand for?
- Replies: 20
- Views: 7662
Re: velocity v=s/d what's the s stand for?
Hi All,
Hey Ian I was wondering where you were during all of this.....
Cheers,
Robb.....
Hey Ian I was wondering where you were during all of this.....
Cheers,
Robb.....
- 27 Oct 2010, 12:51
- Forum: Miscellaneous
- Topic: How do you Organize Your Rocks & Minerals
- Replies: 30
- Views: 9898
Re: How do you Organize Your Rocks & Minerals
Hi All,
I have coth bags for each sample, All are stored in alphabetical order with numbers corresponding to each group.
Cheers,
Robb.....
I have coth bags for each sample, All are stored in alphabetical order with numbers corresponding to each group.
Cheers,
Robb.....