Search found 56 matches

by Anastasia
16 Nov 2021, 10:33
Forum: Recipes and Pracs
Topic: Dilution
Replies: 6
Views: 170

Re: Dilution

Use the formula C1 x V1 = C2 x V2 where C is the concentration and V is the volume, 1 is the first solution and 2 is the second So if you wanted to prepare 100ml of 0.002M solution from a 0.1M solution V1 = (C2 x V2) / C1 = (0.002M x 0.1L) / 0.1M = 0.002L which is 2ml So pipette 2ml of the 0.1M solu...
by Anastasia
11 May 2021, 14:30
Forum: Miscellaneous
Topic: Food technology ordering program
Replies: 6
Views: 2162

Food technology ordering program

Hi everyone,

Just wondering if there is an equivalent to RiskAssess for Food Technology? How does the Food Tech assistant at your school keep track of orders/prep for practical classes?

Any info would be appreciated
Anastasia
by Anastasia
30 Mar 2021, 13:14
Forum: Miscellaneous
Topic: PLNTS Introduction to Science
Replies: 9
Views: 2286

Re: PLNTS Introduction to Science

Germanic ??
by Anastasia
16 Feb 2021, 13:41
Forum: Recipes and Pracs
Topic: Hydrochloric Acid
Replies: 10
Views: 2413

Re: Hydrochloric Acid

I'm thinking: C1 x V1 = C2 x V2 To make up 100ml of 1M (32% HCl assumed to be 12M) 12 x V1 = 1 x 0.1 V1 = 8.33ml So the 100ml of 1M HCl contains 8.3ml 32% HCl To make up 1L of 2M 12 x V1 = 2 x 1 V1 = 166.66ml So the 1L of 2M HCl should contain 166.66ml 32% HCl But you already have 8.33ml of it in th...
by Anastasia
16 Nov 2020, 09:26
Forum: The Lab Tech Position
Topic: How do I describe what I do?
Replies: 49
Views: 23292

Re: How do I describe what I do?

KassH wrote: 13 Nov 2020, 09:02 I'm not so sure about the all " under the supervision of a teacher" references in this?? It's more like teachers completing tasks under the supervision of the Lab Assistant!
Yes I agree!! :D
by Anastasia
12 Oct 2020, 11:04
Forum: Chemistry and Labware - General
Topic: vernier go direct sensors feedback
Replies: 3
Views: 1607

Re: vernier go direct sensors feedback

We purchased the Dynamic cart and Track system which has been used in Physics and Investigating Science. Teachers and students found it easy to download software onto their laptops, set up and use.
by Anastasia
03 Aug 2020, 12:34
Forum: Miscellaneous
Topic: Bee Hive
Replies: 6
Views: 2405

Re: Bee Hive

https://policies.education.nsw.gov.au/p ... cy-schools

I'm assuming you would need to follow the above guidelines and have a policy? Or is that only for vertebrates?
Not worth the trouble IMO
by Anastasia
25 Jun 2020, 14:11
Forum: Recipes and Pracs
Topic: Potassium Iodide
Replies: 6
Views: 2897

Re: Potassium Iodide

Potassium iodide is usually reacted with lead nitrate to give a bright yellow precipitate.
Could it be that your potassium iodide is contaminated?
by Anastasia
12 Mar 2020, 11:05
Forum: Sourcing Materials & Eq Repairs
Topic: MTA products going downhill fast?
Replies: 24
Views: 12427

Re: MTA products going downhill fast?

No not a Nicole but two other individuals who I won't name plus the general sales email. Concerning that so many at MTA don't reply to emails!
by Anastasia
11 Mar 2020, 11:17
Forum: Sourcing Materials & Eq Repairs
Topic: MTA products going downhill fast?
Replies: 24
Views: 12427

Re: MTA products going downhill fast?

I am disappointed with the service at MTA. I have sent multiple emails to seek assistance to 3 different people (our assigned sales support person, technical person and general sales enquiry) over a period of a month and have as yet to hear from any of them. I will not be using MTA for any of our or...
by Anastasia
20 Nov 2018, 08:08
Forum: Miscellaneous
Topic: iron (lll) thiocyanate
Replies: 16
Views: 9067

Re: Iron(111)thiocyanate

From the recipe section of Pearson Chem 12 to prepare 0.0002M iron(III) thiocyanate

pipette 10ml 0.002M KSCN into a 100ml volumetric flask
make up to 100ml with 0.002M Fe(NO3)3
make fresh as solution degrades
by Anastasia
13 Nov 2018, 13:40
Forum: Recipes and Pracs
Topic: Reversible Reactions Prac?
Replies: 12
Views: 7096

Re: Reversible Reactions Prac?

Our Chem teacher did a demo using conc. HCl in a fume cabinet and a solution of 0.1M cobalt chloride. She also heated it and put it in an ice bath. She said it worked well.
by Anastasia
15 Oct 2018, 09:11
Forum: Announcements
Topic: Welcome back everyone to chemtalk
Replies: 26
Views: 15317

Re: Welcome back everyone to chemtalk

So glad its back, thank you Westlab!
by Anastasia
22 Nov 2017, 13:55
Forum: Safety with Chemicals
Topic: calcium granules
Replies: 5
Views: 2771

Re: calcium granules

Thanks for your replies, will put aside for the next chemical disposal.
by Anastasia
22 Nov 2017, 08:57
Forum: Safety with Chemicals
Topic: calcium granules
Replies: 5
Views: 2771

calcium granules

Hi everyone,

I have an old bottle of calcium granules that have turned completely white (they look like coconut flakes). There is no reaction with water or dilute HCl. Any ideas about how to dispose of would be much appreciated.

Anastasia
by Anastasia
16 Oct 2017, 11:14
Forum: Safety with Chemicals
Topic: Chemical Stocktake in a Catholic School
Replies: 5
Views: 3213

Re: Chemical Stocktake in a Catholic School

Hi Rita, I am at an Independent school and this is what I do. Our Chemical Register just lists all the hazardous chemicals from the Chemical store not dilute dropper bottles. Non hazardous chemicals are not listed in the Chemical Register but I do stocktake them in a separate file. I use an excel sp...
by Anastasia
24 Aug 2017, 13:18
Forum: Safety with Chemicals
Topic: SDS
Replies: 49
Views: 22055

Re: SDS

My understanding is that you need a Chemical Register with SDS and correct labelling for all hazardous substances whether bought or made up. So you need to check whether what you are making up and using is hazardous.
by Anastasia
23 Feb 2017, 12:41
Forum: Safety with Chemicals
Topic: Lab coats
Replies: 10
Views: 4404

Re: Lab coats

For the schools that provide lab coats, how do you go about having them washed and how often are they washed?
by Anastasia
18 Jul 2016, 09:45
Forum: Biology, Physics...
Topic: Chemistry Trial Exam
Replies: 3
Views: 3713

Chemistry Trial Exam

Hi All,

Our Chemistry teacher would like to know how much of the Year 12 Chemistry Option Topic is tested in the Trial Exam at various schools. Any replies would be appreciated.

Anastasia
by Anastasia
21 Mar 2016, 13:42
Forum: Safety with Chemicals
Topic: Manganese dioxide
Replies: 9
Views: 4166

Re: Manganese dioxide

We use it for junior classes but I have a small amount already deposited in the bottom of the test tube for the students to just add the hydrogen peroxide to and test for the oxygen liberated. Saves on students using a ridiculous amount of the manganese dioxide powder and all the mess!

Anastasia