Australia's Science Forum

Hi
Could someone please tell me the difference between denatured or undenatured ethanol? Does it make a difference to pracs? I usually purchase denatured but it is not in stock atm at my preferred supplier.
thanks
Kathryn

Our old CRO gave up awhile ago so we bought a new digital one - Digitech. Had it for a couple of years now and have been quite happy with it. No doubt it won't last as long as the old one.
Kathryn

Our teachers are looking for some new ideas for teaching the periodic table. They do chemical bingo but wondering if anyone has any other interesting ideas?
Kathryn

Has anyone used these new circuit pens? They look fun

https://www.youtube.com/watch?v=wqvFT4qTNm8

Haines now have them in stock. I'd be interested to know how long they last and if they can be used with components we already have.

Kathryn

Yes. I was hoping to find a more recent SDS as the one for coablt 60 will expire next year.

yes the alpha, beta & gamma sealed sources.

Hi all Do you have an SDS for your radioactive sources? I have gone directly to the manufacturer in USA and they have said the sources are exempt and provided an exemption letter. Seems to me this is a bit meaningless even if the sources are low risk. Can anyone tell me what they have? Thanks Kathry...

So do your students use it in the lab?

The new bottle of latex we purchased absolutely stinks - the teacher planning to use it describes it as a mixture of rotten milk and dirty nappies. Certainly when he briefly opened it, we both gagged and rushed to open windows. Should it be so smelly or has it gone off?
Kathryn

Hi
Can anyone please tell me the colour code for latex - I can not see it in CSIS.
Thanks
Kathryn

Hi
We are in need of 2 copies of the Biology in Focus HSC textbook. Does anyone have any they no longer need?
Thanks
Kathryn

HI all

I have just purchased a new set of radioactive sources and a storage container. Can anyone tell me if it is ok to store the three different sources (alpha, beta, gamma) in the same container?

Thanks

Kathryn

Actually I have just noticed in "The Laboratory" it says to filter CaSO4

The Westlab meter is the new one we are looking to buy - actually I have now ordered it so will find out how good it is soon.

They are for precipitation pracs - so she has a laminated chart with cations on one side and anions on the other including both calcium sulfate and barium sulfate. The students have to determine which reactions produce a precipitate. Bit hard if you are starting with a cloudy solution.

Hi
What molarity do you use for barium sulfate and calcium sulfate for precipitation pracs? I made 0.1M solutions but they are very cloudy. I have even diluted the barium sulfate down to 0.01M and it is still cloudy. Should I be doing something to increase the solubility?

Kathryn

Hi
Does anyone have the LAQUA-TWIN SALT 11 METER (Westlab)? We are needing to buy a new meter after the last one did not last very long at all so i am wondering how robust this meter is.
Kathryn

Thanks for your replies. I have ordered a couple of the Haines balances to see what they are like.

Hi all
We are needing to purchase new electronic balances. We need them to weigh to 2 decimal places. Any recommendations for good value but sturdy balances?

Thanks
Kathryn

I do the chemical audit for the whole school. i include all chemicals whether opened or not (not dilutions or dropper bottles etc). I can't imagine why you would not include open chemicals - they are just as dangerous and the fire department needs to know where all hazardous chemicals are located. K...