Revision practice复习练习
Practise independently, then use the answers to check your reasoning.先独立完成，再用答案检查你的思路。
Particles to mass calculations从粒子到反应质量计算
36 multiple-choice questions and 8 written questions. New questions practise the same knowledge as the monthly assessment.36 道选择题与 8 道书面题。题目重新设计，知识点与本次月考对应。
Topics: states of matter and diffusion; separation and chromatography; atoms, isotopes and ions; bonding and structures; formulae and mass calculations.范围：物质状态与扩散、分离与色谱、原子与同位素及离子、成键与结构、化学式与质量计算。
Answers are included at the end, starting on page 19. Complete pages 1–18 before checking. Worked calculations and dot-and-cross diagrams are included.答案附在最后，从第 19 页开始。请先完成第 1–18 页，再核对答案；包含计算过程与电子图。
Suggested time: 25 minutes for multiple choice, 50 minutes for written questions and 5 minutes to check. Allow extra time if needed.建议分配：选择题 25 分钟，书面题 50 分钟，检查 5 分钟。按实际需要调整。