Chemistry Olympiad and other competitions

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[1] Chemistry Olympiads - links to national competitions problems

[2] Chemistry Olympiads forum - initial remarks

[3] Contest problem I don't know how to solve. I'm exercising for a contest.

[4] Where I can find the solutions to the preparatory problems for ICHO 2022?

[5] Chemical formula of tooth erosion

[6] Latin American Chemistry Competition (2nd edition)

[7] Flemish chemistry olympiad question

[8] Can someone tell me what I'm doing wrong here? (calculation)

[9] Question about coordinate covalent bond

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