ABSTRACT
This chapter describes the procedure for observing whether a solid can change state directly to a gas. This real-world science experiment is structured as a problem-solving activity thus helping KS3 science teachers to engage students effectively in the secondary school classroom. First, background science knowledge for this experiment is provided, along with the learning objectives; list of materials needed, such as beakers, thermometers, shallow dishes, boss and clamp stand, solid air freshener broken into small pieces, cubes of ice, hot water, fume cupboard and eye protection, for the experiment, safety and technical notes; and a list of engaging activities to be performed by students. Data collection ideas are subsequently provided, together with useful questions to ask the students and also suggestions for homework.
