Australia's Science Forum

Oh I like yours better, Macca. Thanks.

Or take 20mL of 0.1M and dilute to 1L

Solution dilution calculator https://www.sigmaaldrich.com/AU/en/supp ... calculator

Metals (I'm sure you've got that one covered), ionic compounds - NaNO3 and CaCO3, polar covalent - sucrose and glucose, non-polar covalent - iodine and plastic.

There's a book of lab notes that go with this text. Try to track down a copy - I've found it saves a lot of time. When the teachers get in, I'll try to find the lab notes and get back to you.

There are no instructions for disposal of fibreglass on RiskAssess (but it is listed under equipment), so I guess putting it in the bin is fine. It does say stuff about handling with gloves and masks. (Edit) Chemwatch says "Store in cool, dry, protected area. Dispose of this material and its co...

Disposal Retain for collection and recycling by a waste service. Do not place in the garbage or pour down the drain. Small quantities of mercury (<1 mL) may be mixed with 100 times the volume of sulfur powder in a plastic container, placed in a secondary plastic container filled with sulfur, then pl...

Check RiskAssess. Professional disposal. Mercury is a bioaccumulator and incredibly toxic.

Casual teacher taking a science class. "Miss, can we open the petri dishes? We can't see because of the condensation." Teacher didn't know any better, so they opened exposed plates. When I found out, I booted them out of the room for a bit, opened the windows, turned on the fans and spraye...

We bought Westlab analogue ammeters a while ago. Seem to be good so far.

Vandalism is a shocking waste and and a crime against the environment. It is much harder to create rather then destroy - make creation the challenge, not senseless destruction.

Recycling is excellent.

Try this http://www.sempcoinc.com/opticalkitpssc.html

Our quadrats (there's no "n") come apart at the corners, conveniently. They're just dowel rods held together with tubing at each join.

Same, all glassware is in prep.room ordered with pracs through RiskAssess. Kids have to rinse free of residue before teacher returns to prep. room. 90% of pracs go out on trollies our prep. room is central to labs. Bunsen, tripod, gauze, heat mat, retort stand, boss head, clamp and test tube racks ...

4g in 96mL water would be more precise. I use a balance - weigh out 4g chemical then add 96g water.

I put out distilled water, but I'll check with the teacher. Thanks for your time.

Investigating a metallic element Pearson 10 p. 127 The teacher thinks the agar should be clear after addition of the AgNO3, but ours is going a purple gray colour. Anyone know about this?

P.S. Maximum 10g per day of manganese salts down the drain.

Googled this - MnO4−(aq)+H2O2(aq) = Mn2+(aq)+O2(g) It did say it needed to be an acidic environment, so the vinegar was important. I saw someone put vitamin C in KMnO4 and it went colourless. I think this is also the KMnO4 being reduced to Mn ions. I'm still not convinced I need to do anything other...