Chemistry Olympiad and other competitions

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[1] Chemistry Olympiads - links to national competitions problems

[2] Chemistry Olympiads forum - initial remarks

[3] Hess Law's

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

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

[6] Chemical formula of tooth erosion

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

[8] Flemish chemistry olympiad question

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

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