A student makes four statements about composites and other materials.
Statement 1: steel is a composite because it contains two different elements, iron and carbon
Statement 2: in reinforced concrete, the steel rods resist stretching forces that would crack concrete alone
Statement 3: a composite always has properties that are the average of the properties of its components
Statement 4: in fibreglass, the polymer binds the glass fibres so the material is less brittle than glass alone
Which statements are correct?
2 only
1, 2 and 4 only
2 and 4 only
2, 3 and 4 only
36 exam-style questions on Edexcel GCSE Chemistry 10.5 Bulk and surface properties of matter including nanoparticles, covering 10.5.1 Nanoparticles: size, uses and risks and 10.5.2 Comparing and selecting materials. Each one has a worked solution and a mark scheme showing where the marks go.