We are in the fortunate position of having a few quid to spend on new equipment and I am looking at getting some LED rayboxes.
Has anybody tried these from select school supplies? SSS rayboxes
They are cheap for a class set but I am very wary of the old adage of buy cheap buy twice and...
I found this video quite helpful. https://www.saps.org.uk/secondary/teaching-resources/235-student-sheet-23-photosynthesis-using-algae-wrapped-in-jelly-balls
Not that we ever got to use the algae as it died over lockdown.
You can buy a starter culture from blades biological.
I would make up a what you think is a 1M solution of ammonia from your old stock bottle and then titrate it with 1M HCl.
At least that will give you a rough idea of the strength of your stock bottle.
Google suggests methyl orange as the indicator.
You can get something called drager tubes, we used to use them in industry, you suck the air through them and they change colour depending on the concentration of the gas, effectively titrating the air. Probably overkill for this situation though.
Raise your concerns in writing/email but in...
We have to do break and lunch duties here, it was never mentioned in my interview before I took the job.
I have been fighting against it, saying lunch and break are my busy times for delivering/collecting from classrooms and setting up equipment etc, and did manage to convince them to remove me...