Simple molecular structures (Edexcel GCSE Chemistry Combined Science): Flashcards
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Simple molecular structure definition
Simple molecular structure definition
A substance made of millions of small molecules weakly attracted by intermolecular forces
Intermolecular forces
Intermolecular forces
Weak attractions between molecules (weaker than covalent bonds)
Intermolecular forces vs covalent bonds strength
Intermolecular forces vs covalent bonds strength
Intermolecular forces are much weaker than covalent bonds
Why low melting/boiling points in simple molecular structures?
Why low melting/boiling points in simple molecular structures?
Weak intermolecular forces between molecules need little energy to break
State of simple molecular substances at room temp
State of simple molecular substances at room temp
Often gases or liquids
Volatile substance definition
Volatile substance definition
Changes state (liquid to gas) easily
Why are simple molecular substances volatile?
Why are simple molecular substances volatile?
Weak intermolecular forces let molecules escape quickly into gas phase
Why do volatile substances have strong smells?
Why do volatile substances have strong smells?
Molecules escape into gas phase easily (e.g., perfumes)
Electrical conductivity of simple molecular substances
Electrical conductivity of simple molecular substances
Do not conduct electricity
Why no electrical conductivity in simple molecular substances?
Why no electrical conductivity in simple molecular substances?
No free electrons or charged particles to carry current (all electrons used in covalent bonds)
Melting point of water
Melting point of water
0°C
Boiling point of water
Boiling point of water
100°C