Qualification > Sciences
Edexcel CHEMISTRY DOUBTS!!!!
coatseville:
--- Quote from: ksitna on May 12, 2010, 05:05:26 pm ---i need help with percentage yields
can someone help me?
--- End quote ---
For this you use the formula actual yield / theoretical yield x 100.
ksitna:
thanks :)
and can someone tell me where i can find specimen unit 3b?
Blizz_rb93:
Can someone help me with this question from Jan 2010 unit 3b..
Question 4. branch f) only
Here's the question paper and markscheme attached below
Meticulous:
Please any body...a quick question.
When adding alkali to acid, it says:
"Swirl / rinse in drops solution in neck of flask (1)"
what is that supposed to mean?
Saladin:
--- Quote from: The Gladiator on May 12, 2010, 08:31:17 pm ---Please any body...a quick question.
When adding alkali to acid, it says:
"Swirl / rinse in drops solution in neck of flask (1)"
what is that supposed to mean?
--- End quote ---
This basically means that when adding an acid to a base, you need to keep swirling it. Move it and jerk it in a circular motion. Because often, drops dont go straight to the liquid, the often stay on the side of the conical flask.
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