(chemistry only) Use standard form when comparing particle sizes in metres and nanometres.

In the subtopic Sizes of particles and their properties, this learning objective focuses on (chemistry only) Use standard form when comparing particle sizes in metres and nanometres. Within Bulk and surface properties of matter including nanoparticles (chemistry only), students should explain this idea in the exact curriculum context rather than as an isolated fact. Approved keywords for this objective include chemistry only, nano, and standard form. nanoscience means the study of structures from 1 nm to 100 nm. Avoid students often confuse standard form with regular decimal notation when comparing particle sizes, leading to incorrect size comparisons; instead to fix this, practice converting numbers into standard form and ensure you understand how to express very small numbers, such as nanometres, correctly. For exam answers, practice converting particle sizes between metres and nanometres using standard form.