HL:
TZ1:
https://www.reddit.com/r/IBO/comments/8k6e8o/exam_discussion_chemistry_hl_paper_1_tz1/
TZ2:
https://www.reddit.com/r/IBO/comments/8k6ebw/exam_discussion_chemistry_hl_paper_1_tz2/
SL:
TZ1:
https://www.reddit.com/r/IBO/comments/8k6een/exam_discussion_chemistry_sl_paper_1_tz1/
TZ2:
https://www.reddit.com/r/IBO/comments/8k6egq/exam_discussion_chemistry_sl_paper_1_tz2/