A full investigation (2-3 hours) into how the size of a beaker affects the time taken for a candle to go out.
The investigation is described in detail with:
An overview/knowledge sheet for the teacher including extension questions for able students
A cheat sheet with everything broken down into distinct scientific areas such as variables, equipment. method, diagram, safety, prediction, results table and comments on accuracy and reliability
Expected results and graph
Analysis conclusion breakdown with success criteria for low/middle/high students
Note - Please see my free resource under 6zero - Practical Skills for the guide on how to plan a scientific investigation, which this investigation should be used in conjunction with.