Properties of Covalent Substances (AQA A-Level Chemistry): Flashcards
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Two main types of covalent structures
Two main types of covalent structures
Simple molecular and macromolecular (giant covalent)
Forces between simple molecular substances
Forces between simple molecular substances
Weak van der Waals forces
Melting/boiling pts of simple molecular substances
Melting/boiling pts of simple molecular substances
Low - weak intermolecular forces easily overcome
Electrical conductivity of simple molecular substances
Electrical conductivity of simple molecular substances
Poor conductors - no free-moving charged particles
Number of covalent bonds per carbon atom in diamond
Number of covalent bonds per carbon atom in diamond
Four strong covalent bonds
Why diamond doesn't conduct electricity
Why diamond doesn't conduct electricity
No free electrons - all involved in bonding
Number of covalent bonds per carbon atom in graphite
Number of covalent bonds per carbon atom in graphite
Three covalent bonds
Why graphite conducts electricity
Why graphite conducts electricity
Each carbon has one free electron that can move
Melting points of macromolecular structures
Melting points of macromolecular structures
High - vast number of strong covalent bonds
Solubility of macromolecular substances
Solubility of macromolecular substances
Generally insoluble in polar and non-polar solvents