u/Secure_Chard_9023

Benedict’s observation( blue to brick red)
Formula CHO or aldehyde
Observation brown fumes gas Br
Purple fume gas I
The isomer ch3ch(oh)chi contains a ch3 group so it can form a fragment with m/z=15 from ch3+ion
Heating crystal) weigh empty crucible then weigh crucible +crystal heat to constant mass
The third last question about reflux I said the reaction mixture boils and forms a vapor then rises in the condenser then the vapor is cooled and condense and return back into the reaction mixture
Moles of HCl 0.022
0.0011
0.011
N=10
48.7%

Hey everyone, I did Edexcel IAL Biology in January and unfortunately I failed Unit 3 and got an E. Honestly, I still don’t fully understand where I messed up because I was genuinely confident that I would at least pass, but that wasn’t the case.

I’m now retaking U3, but the problem is I haven’t even started revising yet and I’m feeling really overwhelmed. If anyone has any good resources, notes, revision tips, YouTube channels, or advice that helped you with Biology U3, I would really appreciate it.

Especially anything that explains the practicals, evaluation questions, and how to structure answers properly.

Thank you so much in advance.