HL:
TZ1:
https://www.reddit.com/r/IBO/comments/8k6ea9/exam_discussion_chemistry_hl_paper_2_tz1/
TZ2:
https://www.reddit.com/r/IBO/comments/8k6ed4/exam_discussion_chemistry_hl_paper_2_tz2/
SL:
TZ1:
https://www.reddit.com/r/IBO/comments/8k6efu/exam_discussion_chemistry_sl_paper_2_tz1/
TZ2:
https://www.reddit.com/r/IBO/comments/8k6ehz/exam_discussion_chemistry_sl_paper_2_tz2/