The Chemistry Competition covers the four major fields of inorganic chemistry, organic chemistry, analytical chemistry and physical chemistry, focusing on students' understanding and application of chemical principles. The competition is in the form of a closed-form written examination, which lasts 120 minutes and has a total score of 150 points. The question types include multiple choice questions (15 questions, 3 points per question), fill-in-the-blank questions (8 questions, 2 points per blank), and computational questions/inference questions (4 questions, 66 points in total). The writing of chemical equations is relatively large, requiring correct trimming, complete conditions, and complete status symbols. Tips for answering questions: 1. Attention to exclusion and comparison methods for multiple choice questions; 2. Extrapolating questions to find breakthroughs, such as special colors, special reactions; 3. Calculate the unit conversion and valid numbers for the problem; 4. The chemical equation must be trimmed. Calculators are allowed for exams, but devices with storage functions are not allowed. Candidates are advised to pay attention to the writing of chemical equations and the memory of experimental phenomena when reviewing.