Search found 204 matches
- 03 Jul 2009, 08:40
- Forum: Sourcing Materials & Eq Repairs
- Topic: Electroscopes
- Replies: 17
- Views: 5420
Re: Electroscopes
A faster way than rubbing perspex/ebony rods is Prof Bunsen's Fun-Fly Stick! (its a hand-held mini Van der Graaf) Just turn it on (without the fun-flyers) and move it near the electroscope/s.
- 03 Jul 2009, 08:28
- Forum: Miscellaneous
- Topic: End of financial year?????
- Replies: 19
- Views: 7284
Re: Tax Time
Yeah, laundry & shopping (supermarket, abbatoir etc.)
I keep a voice recorder in my vehicle to record trips - so much easier than a written diary. Play it back and type the info into an Excel file on my home computer.
I keep a voice recorder in my vehicle to record trips - so much easier than a written diary. Play it back and type the info into an Excel file on my home computer.
- 15 Jun 2009, 15:21
- Forum: Recipes and Pracs
- Topic: Preparing Esters
- Replies: 10
- Views: 4527
Re: Preparing Esters
We use the round quickfit flasks, attach condenser and reflux in an electric heating mantle.
- 22 May 2009, 12:05
- Forum: Chemistry and Labware - General
- Topic: Ammonium nitrate
- Replies: 39
- Views: 16157
Re: Ammonium nitrate
Just to clarify ...no, wait... contradict my previous post: I put in a requisition which included 500g ammonium nitrate earlier this year. The company could not supply because " Item 1038058 is no longer available as the supply of this product to Australian schools has been banned by the Austra...
- 08 May 2009, 09:26
- Forum: Recipes and Pracs
- Topic: Smoke bombs
- Replies: 4
- Views: 2277
Re: Smoke bombs
12g potassium nitrate 8g white sugar Place dry ingredients in a beaker and using hot plate, heat with stirring until molten and caramelized. Beaker tongs are recommended. Do not heat ingredients with a naked flame/Bunsen. Pour/scrape into evaporating dish or a paper cup. Allow to set. Take outside a...
- 01 May 2009, 13:55
- Forum: Chemistry and Labware - General
- Topic: Urgent Help making bromine Water
- Replies: 34
- Views: 10844
Re: Urgent Help making bromine Water
There's a real easy method under 'Bromine' in CSIS Appendix F: just add a few drops of H2O2 & H2SO4 to dilute KBr solution.
- 20 Mar 2009, 08:17
- Forum: Miscellaneous
- Topic: What to wear
- Replies: 51
- Views: 15569
Re: What to wear
If there's a no-denim policy here, no-one's told me. I wear black jeans (mainly cos I hate blue), shirt with collar. What cactus155 said about ties:
![Winking :wink2:](./images/smilies/icon_wink2.gif)
![Applause =D>](./images/smilies/eusa_clap.gif)
![Winking :wink2:](./images/smilies/icon_wink2.gif)
- 27 Feb 2009, 13:44
- Forum: Chemistry and Labware - General
- Topic: standardized NaOH
- Replies: 20
- Views: 12850
Re: standardized NaOH
Flowers? Flowers? Bribery & Corruption!
- 27 Feb 2009, 11:03
- Forum: Chemistry and Labware - General
- Topic: standardized NaOH
- Replies: 20
- Views: 12850
Re: standardized NaOH
0.100M? It is meaningless if she wants standardised solution to 3 decimal points unless you have an analytical balance capable of weighing the primary standard to at least 3 decimal points. Even if you have such a balance, schools aren't analytical laboratories and if the students end up working in ...
- 23 Feb 2009, 14:46
- Forum: Biology, Physics...
- Topic: Phenolphthalein Agar
- Replies: 175
- Views: 115362
Re: Phenolphthalein Agar
I use a 10-dropper tray with the divider removed to set the agar. Gives nice sharp corners and a depth of 3cm. I tape some graph paper under a sheet of perspex for cutting the set agar. I like to make it a really strong colour, so fading isn't a problem. Here's my recipe: PINK/PHENOLPHTHALEIN AGAR B...
- 18 Feb 2009, 11:54
- Forum: Biology, Physics...
- Topic: Cloud Chambers
- Replies: 4
- Views: 3247
Re: Cloud Chambers
We built one from scratch, uslng a small aquarium. Instructions here:
http://www.lns.cornell.edu/~adf4/cloud.html
Works really well using heaps of dry ice in a dark room.
http://www.lns.cornell.edu/~adf4/cloud.html
Works really well using heaps of dry ice in a dark room.
- 13 Feb 2009, 09:13
- Forum: Miscellaneous
- Topic: Dataloggers
- Replies: 31
- Views: 10270
Re: Who uses Data Loggers?
We got a new Data Harvest electrode last year which read way over in pH 7 buffer. I tried calibrating using the Sensor Config, but the ADC values were basically all the same for ph 4,7 & 10 so the program wouldn't accept the calibration. I rang the supplier and was interrogated as to why I neede...
- 28 Jan 2009, 07:37
- Forum: Chemistry and Labware - General
- Topic: And just like that, it is all over...
- Replies: 35
- Views: 11065
Re: And just like that, it is all over...
Back (with a vengence) today, with yrs 7, 11 & 12. The rest back tomorrow.
Isn't it great to get the holidays out of the way and get back to work?
Come on, think positively!
![Very Happy :D](./images/smilies/biggrin.gif)
![Coffee :coffee:](./images/smilies/coffee1.gif)
Isn't it great to get the holidays out of the way and get back to work?
![Dancing \:D/](./images/smilies/eusa_dance.gif)
Come on, think positively!
![Very Happy :D](./images/smilies/biggrin.gif)
- 21 Nov 2008, 08:14
- Forum: Safety with Chemicals
- Topic: Rocket Engine
- Replies: 8
- Views: 3298
Re: Rocket Engine
You could try igniting it under an upturned wheely-bin? Listen for 2ndry ignition.
We've fired rockets horizontally at a mannequin's head positioned inside a wheely-bin on its side. Testing PPE you know; the mannequin was wearing safety goggles.
![Cool 8-)](./images/smilies/cool.gif)
We've fired rockets horizontally at a mannequin's head positioned inside a wheely-bin on its side. Testing PPE you know; the mannequin was wearing safety goggles.
![Cool 8-)](./images/smilies/cool.gif)
- 31 Oct 2008, 10:46
- Forum: Announcements
- Topic: prac class
- Replies: 12
- Views: 5272
Re: prac class
Old yeast can be a problem. I use the 7g packets for Coopers home brew; high turn-over means its usually fresh, plus its not too fussy if it gets a bit hot.
- 22 Oct 2008, 07:30
- Forum: Safety with Chemicals
- Topic: Bromine water - disposal
- Replies: 10
- Views: 3549
Re: Bromine water - disposal
There's a real easy method under 'Bromine' in CSIS Appendix F: just add a few drops of H 2 O 2 & H 2 SO 4 to dilute KBr solution. I dispose of products in Halogenated Organic Waste bottle, and leave test tubes in fume cupboard to evaporate off residue. Cyclohexene is particularly horrible stuff....
- 15 Oct 2008, 08:19
- Forum: Miscellaneous
- Topic: HOLIDAYS
- Replies: 29
- Views: 9110
Re: HOLIDAYS
Daughter back in one piece @ 10pm last night, and she didn't leave her stuff strewn all over the English countryside (well, just her diary); mother has stopped fretting. ![Thumbsup :thumbup:](./images/smilies/thumbsup.gif)
![Thumbsup :thumbup:](./images/smilies/thumbsup.gif)
- 26 Sep 2008, 09:33
- Forum: Miscellaneous
- Topic: HOLIDAYS
- Replies: 29
- Views: 9110
Re: HOLIDAYS
My 14-Y-O daughter is flying to England tomorrow with the school choir tour. She's never flown on fiixed-wing aircraft & 1st time OS (besides Tassie). Mother is in melt-down mode.
- 19 Sep 2008, 10:00
- Forum: Sourcing Materials & Eq Repairs
- Topic: DNA Model
- Replies: 8
- Views: 3028
Re: DNA Model
smiley-you guessed it. And its because I just follow the instructions instead of saying "this should go there, no that should be opposite this" etc.
- 19 Sep 2008, 08:59
- Forum: Sourcing Materials & Eq Repairs
- Topic: DNA Model
- Replies: 8
- Views: 3028
Re: DNA Model
We've got a 71-piece 'Zome' DNA kit (and a buckyball). The plastic bits for bonds and nucleotides are colour-coded. The teachers get the expert to construct it (rather than the kids), so we haven't lost any pieces (yet)!