Using provided data students decide which of three liquids would freeze if placed in a freezer. Students explain what happens to particles when they freeze and how the level changes due to freezing.
Students are provided with five diagrams of different arrangements of atoms. They select which diagram represents water, graphite, oxygen, and carbon monoxide.
Task: Students place in order four beakers of copper sulphate solution from most to least concentrated. They then explain what would happen if two beakers were put together, and explain the term "concentration". Assessment focus: solutions.
Students are asked to identify a solid, liquid, and a gas. They are also asked to write down two things that are generally true for each of these three states of matter.
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.
Students consider the potential for chemical change when a range of everyday substances are mixed. They use logical reasoning to work out the consequences of four pairs of reactions.
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.