CURRICULUM

Chemistry: Four Difficulties, 4000 Levels

Chemistry has four difficulties with 1000 levels each and ten questions per level; stabilize accuracy before moving up. Chemistry levels ask for symbols, ions, isotopes and atomic mass; keep protons, neutrons and electrons separate.

化学基础闯关Chemistry Basics1000 关化学进阶闯关Chemistry Intermediate1000 关化学高阶闯关Chemistry Advanced1000 关化学挑战闯关Chemistry Challenge1000 关

How it works

  1. Start at the basic difficulty.
  2. Ten questions per level; clear one to unlock the next.
  3. Review at 1/3/7/14/30 days.

FAQ

Which difficulty?

Start at basic and move up when accuracy stays above 80%.

How many levels each?

1000.