Gridlocks: 11-14 year olds (Also known as Level 1 - Heliums)


Gridlocks are a fun way to learn the facts you need in Chemistry. The puzzles here are for 11-14 year olds and designed to work in the same way as Su Doku, Gridlocks combine chemistry and puzzles to help learn about chemistry topics. The top selection are interactive and can be played online, the rest can be printed off and done in class or for homework.

Type of Activity

working independently



Age Group

11 to 14 years

Gridlocks puzzle on hazard symbols including corrosive, flammable, health hazards and toxic symbols.


If you would like to receive the answers to any of the PDF puzzles, please

Written by Tim Jolliff, a previous RSC School Teacher Fellow.