Search found 192 matches

by nickykinz
02 Apr 2019, 15:12
Forum: Biology, Physics...
Topic: Berlese/Tullgren funnel
Replies: 1
Views: 823

Berlese/Tullgren funnel

Our Biol teacher is thinking about doing this next year for the student lead prac. While individually they don’t look too hard to set up, we will be talking about large numbers. He is thinking that each group can collect leaf litter from different areas (the modification) so will need 3 per group fo...
by nickykinz
02 Apr 2019, 10:58
Forum: Recipes and Pracs
Topic: Back Titration Ideas
Replies: 9
Views: 1288

Re: Back Titration Ideas

We do "Determining the purity of a sample of calcium carbonate". You put the accurately weighed carbonate in excess HCl then titrate the remaining HCl with NaOH. I can try and scan it for you if you want.
by nickykinz
12 Mar 2019, 12:31
Forum: Biology, Physics...
Topic: Phenolphthalein Agar
Replies: 141
Views: 16252

Re: Phenolphthalein Agar

I usually use 25g per L but just because it gives a firmer agar, not because it didn't set. I do also use powdered phenolphthalein as it seems to give a better colour. I do 1g per litre. It sounds like you did everything else right though. I make sure it boils but not for a particular amount of time...
by nickykinz
12 Mar 2019, 11:47
Forum: Biology, Physics...
Topic: Physiology pracs please
Replies: 5
Views: 945

Re: Physiology pracs please

Just the standard breathing into bromothymol blue before & after running around, & adding ammonia dropwise to bring the colour back. Heart rate is taking pulse before & after running around, & we also do breath holding timed before & after running around. They cover the bases topic-wise, but I was ...
by nickykinz
12 Nov 2018, 13:27
Forum: Sourcing Materials & Eq Repairs
Topic: rheostats/potentiometers
Replies: 6
Views: 1057

Re: rheostats/potentiometers

Yes, that’s what I have and was going to get more of. Sounds like not the way to go then. Thanks for that, I’ll have a look at Haines.
by nickykinz
12 Nov 2018, 12:17
Forum: Sourcing Materials & Eq Repairs
Topic: rheostats/potentiometers
Replies: 6
Views: 1057

Re: rheostats/potentiometers

They go as low as 500 ohms so should I get those then? The lower the better?
by nickykinz
12 Nov 2018, 10:35
Forum: Sourcing Materials & Eq Repairs
Topic: rheostats/potentiometers
Replies: 6
Views: 1057

Re: rheostats/potentiometers

A teacher has asked me for variable resistors for a year 8 class on circuits. We have slide rheostats, resistor sets (with 7 different resistors in them) and potentiometers. All seem to work within a simple battery bulb circuit but only at one end of the range and go from on to off very quickly. The...
by nickykinz
19 Oct 2018, 11:09
Forum: Recipes and Pracs
Topic: Iron II Sulfate
Replies: 14
Views: 1888

Re: Iron II Sulfate

I bought ammonium ferrous sulfate to use in our cation identification prac and have just made a 0.1M solution. After making it I realised that I hadn't checked how to make it and that maybe it needed sulfuric acid in it like ferrous sulfate does. According to "The Laboratory" it doesn't though. Does...
by nickykinz
12 Oct 2018, 12:13
Forum: Announcements
Topic: Welcome back everyone to chemtalk
Replies: 26
Views: 3841

Re: Welcome back everyone to chemtalk

Unblocked! :D :D :D :thumbup:
by nickykinz
11 Oct 2018, 12:27
Forum: Announcements
Topic: Welcome back everyone to chemtalk
Replies: 26
Views: 3841

Re: Welcome back everyone to chemtalk

Very happy to have Chemtalk back. The only problem is that I can't access it at work anymore. It comes up as a message board/forum. I am currently on my phone! I'll have to see if I can get it unblocked.
by nickykinz
24 Nov 2017, 09:12
Forum: Recipes and Pracs
Topic: Christmas themed prac's for yr6 visits
Replies: 14
Views: 1739

Re: Christmas themed prac's for yr6 visits

pdf was too large a file so i took a screen shot and put it in a word file. You could probably do a better job anyway but gives the idea.
by nickykinz
24 Nov 2017, 09:05
Forum: Recipes and Pracs
Topic: Christmas themed prac's for yr6 visits
Replies: 14
Views: 1739

Re: Christmas themed prac's for yr6 visits

We had a good one making Xmas angels by doing chromatography on coffee filters. That makes the skirt of the angel and then there was a template for the top of the angel that they coloured in and stapled onto the skirt. The problem is i found it very difficult to find white coffee filters as they all...
by nickykinz
18 Oct 2017, 11:25
Forum: Safety with Chemicals
Topic: Aprons or Lab coats
Replies: 10
Views: 1239

Re: Aprons or Lab coats

we have lab coats for senior classes and aprons for middle years (6-9). Some of our year 10 classes happen in MY labs so those classes have to put up with aprons. The aprons we have are wipe-able (vinyl coated fabric from "Australian Apron Makers"). I like having those kind of aprons as i think it i...
by nickykinz
25 Aug 2017, 10:05
Forum: Miscellaneous
Topic: Chemwatch have done it again
Replies: 28
Views: 3202

Re: Chemwatch have done it again

Lorikeet, do you have a location on there? I really like the idea but wasn't sure if you needed to have locations in the manifest too. This can be multiple places as we have a senior prep room and a middle years prep room plus bulk chemicals and class sets in different places.