An industrial abrasive, substance X\text{X}X, is evaluated for use in high-temperature cutting tools. Tests show that substance X\text{X}X has a melting point of 2730∘C2730^\circ\text{C}2730∘C, is completely insoluble in water, and does not conduct electricity in either its solid or molten state.
What type of substance is substance X\text{X}X?
Giant covalent
Ionic
Metallic
Simple molecular
59 exam-style questions on Edexcel GCSE Chemistry 2.5 Types of substance, covering 2.5.1 Classifying substances by structure and bonding, 2.5.2 Properties of ionic and simple molecular substances, 2.5.3 Giant covalent structures: diamond and graphite, 2.5.4 Fullerenes, graphene and simple polymers, 2.5.5 Properties of metals and non-metals, and 2.5.6 Limitations of bonding models and representations. Each one has a worked solution and a mark scheme showing where the marks go.