Students are given two equations describing the burning of petrol. Students identify each as either complete or incomplete combustion and then describe two disadvantages of incomplete combustion.
Task: Decide whether described situations are examples of melting or dissolving, provide further examples, and describe what happens when something melts, and when something dissolves. Assessment focus: definitions of melting and dissolving.
Students classify six common substances as either a solid, liquid, or a gas. Students then group these substances into elements, mixtures, or compounds.
Task: Describe where water goes when washing is drying and from a swimming pool, and discuss factors that affect this process. Assessment focus: evaporation.