Search found 326 matches

by bigmack
14 Nov 2019, 11:59
Forum: Announcements
Topic: Those Fires
Replies: 14
Views: 417

Re: Those Fires

We wet the place down in the morning and evacuated to Coffs Harbour as recommended by the RFS. The smoke in Coffs was chokingly thick in the morning but by lunchtime the wind was blowing offshore so it not so bad . We managed to get a tiny air-conditioned dogbox at a camping ground so we were lucky ...
by bigmack
14 Nov 2019, 09:34
Forum: Safety with Chemicals
Topic: CSIS training
Replies: 5
Views: 174

Re: CSIS training

Gosh Merilyn , I had to check it wasn't April fools day .
It hasn't happened here in 20 years
by bigmack
14 Nov 2019, 08:31
Forum: Biology, Physics...
Topic: Bell in a vacuum
Replies: 9
Views: 299

Re: Bell in a vacuum

The bell disappeared from the bell jar somehow, so we put a phone in and call it. Works beautifully. We've got an oil-free pump, no brand markings on it I'm afraid. That's an awesome idea Marama T :thumbup: It also shows that radio waves can travel through a vacuum too . We have an electric bell in...
by bigmack
11 Nov 2019, 13:38
Forum: Announcements
Topic: Those Fires
Replies: 14
Views: 417

Re: Those Fires

Thankyou all for your blessings and I offer mine to you Merilyn and all others out there tomorrow . May the idiots chose wisely....we have enough danger already . Incidentally the Pump down by my dam just failed a few weeks ago and I've been using a spare to water the garden but it doesn't have enou...
by bigmack
11 Nov 2019, 11:26
Forum: Announcements
Topic: Those Fires
Replies: 14
Views: 417

Re: Those Fires

Not good here . We had 40 houses destroyed over the weekend around our school . Tomorrow our valley is likely to be evacuated ...one of our teachers has been advised that tomorrow he has to evacuate ..the power will be disconnected from that area . Won't be sticking around to try and fight a raging ...
by bigmack
04 Nov 2019, 12:51
Forum: Chemistry and Labware - General
Topic: Yr 12. Determination of Keq by Colorimetry
Replies: 11
Views: 557

Re: Yr 12. Determination of Keq by Colorimetry

Hey bigmac, Which textbook is your chem teacher using, as we too are getting some weird results? Could you please find out for me. Thnks Carlie Hi Carlie It's an old text book called Chemical Science ,Laboratory Manual ,Carswell. We have both the student version and the teachers version which has a...
by bigmack
01 Nov 2019, 13:49
Forum: Chemistry and Labware - General
Topic: Yr 12. Determination of Keq by Colorimetry
Replies: 11
Views: 557

Re: Yr 12. Determination of Keq by Colorimetry

We just did it .Chem teacher used an old book they used to do it 20 years ago .

0.2M Fe(NO)3
0.002M KSCN

He said it worked a teat . I wonder if your books have typos in them and the Molarities are back to front
by bigmack
29 Oct 2019, 11:37
Forum: Recipes and Pracs
Topic: Cutting Magnesium ribbon
Replies: 5
Views: 483

Re: Cutting Magnesium ribbon

That is awesomely clever! Well done! Now, you just have to make it adjustable and start producing them to sell. I'd happily pay for something like that. Thanks Merilyn , yeah I was going to make it adjustable but run out of time . I bet a Chinabot has already seen this and gone into production :che...
by bigmack
25 Oct 2019, 12:50
Forum: Recipes and Pracs
Topic: Cutting Magnesium ribbon
Replies: 5
Views: 483

Cutting Magnesium ribbon

Had to cut up about 300 pieces of Mg all exactly the same size for a reaction rate prac .
Got cunning .
Glued some scissors to a block of wood :grin:
Cutting Magnesium Ribbon.jpg
Close up.jpg
by bigmack
27 Sep 2019, 11:36
Forum: Chemistry and Labware - General
Topic: Safe moving of Chemicals?
Replies: 7
Views: 600

Re: Safe moving of Chemicals?

I think I would have to do it myself Ian . ....way easier than trying to organise someone else , plus , I'd know exactly where I had put everything .

Good luck with your move , sounds like you might end up with a fantastic new building .
by bigmack
24 Sep 2019, 15:24
Forum: Chemistry and Labware - General
Topic: Microscopes for senior Biology
Replies: 5
Views: 385

Re: Microscopes for senior Biology

I would strongly recommend going down that line too . We got a couple of Microscopes from ISSCO that come with a camera but when we tried to install the software on latest rollout of Laptops , it wouldn't work .Website link for software update no longer there . So cameras are becoming obsolete after...
by bigmack
27 Aug 2019, 13:55
Forum: Biology, Physics...
Topic: Phenolphthalein Agar
Replies: 141
Views: 15557

Re: Phenolphthalein Agar

People have been wondering how long the phenolphthalein agar lasts for - I had some in the fridge when I started at this school in 2016 and didn't have to make more until this year. It worked perfectly and the only reason I had to make more was because it went mouldy. That's funny Marama , I just d...
by bigmack
27 Aug 2019, 10:35
Forum: Announcements
Topic: Will you be the lucky winner of the Golden Ticket?
Replies: 21
Views: 1353

Re: Will you be the lucky winner of the Golden Ticket?

J wrote:
26 Aug 2019, 09:32
No ticket here yet.
Mails a bit slow up the mountain J

I got a Blue one :D
ticket.jpg
by bigmack
12 Aug 2019, 14:55
Forum: Safety with Chemicals
Topic: Disposal of Sodium Thiosulfate?
Replies: 14
Views: 1834

Re: Sodium thiosulfate

sodium thiosulfate* sodium hyposulfite hypo 7-12 1 2 3 4 5 6 - NR Not Hazardous - - 7772-98-7 Moderately toxic if ingested. Forms toxic gases on contact with acids and on heating. Photographic fixer. Used in crystallisation experiments and redox titrations. Small quantities can be sued for chemical...
by bigmack
06 Aug 2019, 14:29
Forum: Recipes and Pracs
Topic: Iron II Sulfate
Replies: 14
Views: 1789

Re: Iron II Sulfate

Labbie wrote:
06 Aug 2019, 14:01
Put a Fe nail (NEW) of course into the solution, this helps it not going to Iron III a little slower. The little nail really does work.
Might give that a go Labbie