H1 Chemistry and H2 Chemistry are both core subjects in the Junior College (JC) curriculum in Singapore. H2 Chemistry is a more advanced version of H1 Chemistry, and covers a wider range of topics and requires a higher level of chemical proficiency.

H1 Chemistry covers the basics of chemistry, including atomic structure, chemical bonding, stoichiometry, chemical equilibrium, acids and bases, and organic chemistry. H1 Chemistry is suitable for students who want a general understanding of chemistry but do not intend to pursue a career in a field that requires advanced chemistry knowledge.

H2 Chemistry, on the other hand, covers all the topics in H1 Chemistry in greater depth, and also covers additional topics such as thermodynamics, electrochemistry, chemical kinetics, and analytical chemistry. H2 Chemistry is recommended for students who intend to pursue a degree in fields such as medicine, chemistry, or chemical engineering, as it provides a strong foundation in the advanced chemical concepts required for these fields.

The main difference between H1 Chemistry and H2 Chemistry is the level of depth and complexity. H2 Chemistry requires a higher level of chemical proficiency, and covers more topics than H1 Chemistry. H2 Chemistry is also a more demanding subject, with a greater workload and higher expectations in terms of problem-solving and critical thinking skills.

In terms of university admissions, most university courses require at least H1 Chemistry, while some courses require H2 Chemistry. Therefore, it is recommended that students take H2 Chemistry if they are considering pursuing a degree in a field that requires advanced chemistry knowledge. However, it is important to note that H1 Chemistry is still a valuable subject that provides a good foundation in chemistry, and can be suitable for students who are not planning to pursue a career in a field that requires advanced chemistry knowledge.