Search found 56 matches

by JelJane
11 May 2015, 10:58
Forum: Chemistry and Labware - General
Topic: SILVER NITRATE INDICATOR
Replies: 5
Views: 2834

Re: SILVER NITRATE INDICATOR

Only thing I can think of would be cobalt - though why that would be in the puddle....??

[Co(H2O)6]2+(aq)(pink) + 4Cl-(aq) ⇌ [CoCl4]2-(aq)(blue) + 6H2O(l)

Removal of chloride ions through precipitation with silver nitrate would push equilibrium to the left.
by JelJane
15 Sep 2014, 07:54
Forum: Recipes and Pracs
Topic: Year 12 prac
Replies: 23
Views: 15057

Re: Year 12 prac

So pretty 8-) ! Gotta love chemistry - do the kids get to take them home?
by JelJane
19 Jun 2014, 07:21
Forum: Chemistry and Labware - General
Topic: Broken Glassware
Replies: 25
Views: 9592

Re: Broken Glassware

Most of our broken glass is from smallish containers - lots of test tubes and small beakers - so I give the teachers an ice cream container which when full I put the lid on and tape up, label broken glass and put in bin.
by JelJane
30 May 2014, 09:02
Forum: Chemistry and Labware - General
Topic: periodic table tiles.
Replies: 1
Views: 1988

Re: periodic table tiles.

Not sure that you mean periodic table tiles... here is a jigsaw set of positive and negative ions for this sort of thing...

http://ntps9thgradescience.wikispaces.c ... pounds.pdf

Cheers,

Jane
by JelJane
28 Nov 2013, 07:57
Forum: Recipes and Pracs
Topic: Edible roks experiment
Replies: 6
Views: 3616

Re: Edible roks experiment

You can use mini or large M&M's for baking...
by JelJane
26 Nov 2013, 06:42
Forum: Biology, Physics...
Topic: Biotechnology ideas
Replies: 6
Views: 3511

Re: Biotechnology ideas

Shell is developing a process for using Bacteria (E.coli) to produce diesel.

NZ manuka honey being used for wound dressing.
by JelJane
29 Oct 2013, 08:43
Forum: Recipes and Pracs
Topic: Extracting caffeine from Tea
Replies: 4
Views: 2891

Re: Extracting caffeine from Tea

Not sure what you are allowed to use over there. Found this one that uses hexane and isopropyl alcohol. http://oxytops.wordpress.com/2012/10/31 ... -tea-bags/
by JelJane
29 Oct 2013, 08:24
Forum: Safety with Chemicals
Topic: Hand sanitiser : hand cleaner
Replies: 3
Views: 2593

Re: Hand sanitiser : hand cleaner

Hi Kathryn,

This looks like a fairly reasonable liquid soap formulation. The first four ingredients are surfactants commonly used in liquid hand soaps and shampoos.

Cheers,

Jane
by JelJane
12 Sep 2013, 07:57
Forum: Recipes and Pracs
Topic: Boiling Metho
Replies: 10
Views: 4870

Re: Boiling Metho

Similar to Lada, we get them to boil the water over the bunsen, turn the bunsen OFF, then put the boiling tube with meths into the hot water.
by JelJane
23 Aug 2013, 07:15
Forum: Recipes and Pracs
Topic: How do you test the energy in sugar?
Replies: 6
Views: 3878

Re: How do you test the energy in sugar?

You can use marshmallows instead of tiny teddies but they are quite messy. Wonder whether you could use fairy floss as this is pretty much pure sugar? We normally use cheezels instead of peanuts here for measuring the energy content of food - they are easily stuck onto a pin set in plaster of paris ...
by JelJane
08 Jul 2013, 10:50
Forum: Chemistry and Labware - General
Topic: Question for any chemistry wizzes still around
Replies: 3
Views: 2273

Re: Question for any chemistry wizzes still around

Can you tell me what the formulas of the specific alchols you are trying to use are...?

Sounds odd...
by JelJane
09 Apr 2013, 09:45
Forum: Biology, Physics...
Topic: samples from the bottom of the pond
Replies: 3
Views: 2401

Re: samples from the bottom of the pond

There are bottom, middle, top samplers available for sampling bulk storage tanks (think petrochemicals, previous life!). They are basically a stainless steel cylinder with a pull valve and shut off when full. Google "bottom tank sampler". You could try borrowing one or make your own...
by JelJane
09 Apr 2013, 09:32
Forum: Safety with Chemicals
Topic: Corrosive Cabinets
Replies: 6
Views: 3142

Re: Corrosive Cabinets

One of the suppliers here recommends "A small dish of calcium carbonate in the cabinet will help to neutralise the atmosphere" - only issue I have with this is then you are not keeping acids segregated....
by JelJane
07 Aug 2012, 11:05
Forum: Chemistry and Labware - General
Topic: Spectrometer
Replies: 15
Views: 8713

Re: Spectrometer

Memories of once upon a time.... :giggle:
by JelJane
07 Aug 2012, 11:00
Forum: Sourcing Materials & Eq Repairs
Topic: Quadrats?
Replies: 23
Views: 11757

Re: Quadrats?

We have some here that were made by a previous technician. They are 0.5m square clear heavy plastic and are marked with permanent marker into gridlines. Easy to store and clean!
by JelJane
25 Jun 2012, 09:06
Forum: Recipes and Pracs
Topic: Classification and ecosystems
Replies: 10
Views: 4213

Re: Classification and ecosystems

I have been known to be out collecting insects from my garden at 7am for this... slaters, spiders (the bigger the better in a boys school, luckily 99% are non-poisonous here in NZ), stick insects, wetas, worms, and snails as well as going to the supermarket and purchasing 2 prawns, 2 shellfish etc. ...
by JelJane
23 Apr 2012, 09:45
Forum: Sourcing Materials & Eq Repairs
Topic: How to Repair a Skeleton Anatomical Model?
Replies: 3
Views: 2000

Re: How to Repair a Skeleton Anatomical Model?

I repaired ours last year - skull was broken in a couple of places, several teeth had fallen out and there were a couple of other cracks - poor chap was in a bad way! I believe I used Selley's Plastic Glue and it seems to be holding together.
by JelJane
14 Mar 2012, 11:04
Forum: Safety with Chemicals
Topic: Are these chemicals appropriate
Replies: 21
Views: 6693

Re: Are these chemicals appropriate

We do the same as Jazz with Lithium, it is useful (but not essential) to have both lithium and sodium so you can demonstrate (teacher only) the increased reactivity of elements in the same group as you go down the periodic table.
by JelJane
23 Feb 2012, 11:30
Forum: Chemistry and Labware - General
Topic: Copper Mesh (Gauze)
Replies: 8
Views: 3469

Re: Copper Mesh (Gauze)

I have made my own "mesh" in the past for this one by just weaving some thin uncoated copper wire - worked OK!
by JelJane
23 Feb 2012, 11:25
Forum: Safety with Chemicals
Topic: SDS + Chemwatch
Replies: 47
Views: 15000

Re: SDS + Chemwatch

In my opinion a generic MSDS for "pure" chemicals is fine - theoretically the hazard properties for potassium iodide supplied by Joe Bloggs will be the same for that supplied by the Queen! (Unfortunately I know that different suppliers MSDS's in practice often have slightly different or co...