L8 & 9: Covalent Bonding Flashcards
True or false: In covalent bonding, electron pairs are shared by both participating atoms
True
True or false: Covalent bonds are directional
True
True or false: Covalent bonds form between metals and non-metals
False. Covalent bonds form between the atoms of the same or different non-metal elements
True or false: Covalent bonding is found in organic compounds
True
True or false: When atoms interact to form molecules, the overall number of orbitals must remain the same
True
What is a Lewis Structure?
A graphic representation of the valence electrons of an atom. Each electron is represented by dots and crosses.
True or false: Covalent bonding is favoured by atoms with low ionisation energy
False. Covalent bonding is favoured by those with high ionisation energy
True or false: Covalent bonding is favoured by atoms of equal electron affinity and equal electronegativity
True
True or false: Covalent bonding is favoured by atoms with a high nuclear charge
True
True or false: Covalent bonding is favoured by atoms with a large atomic size
False. Covalent bonding is favoured by atoms with a small atomic size
True or false: Most MCQ options that say “always” or “never” are wrong
True
Fill in the gap:
Covalent compounds are __________ electrical conductors.
poor
Fill in the gap:
Covalent compounds tend to have ____(1)____ melting points and ____(2)_____ boiling points
(1) low
(2) low
If covalent bonds are strong, why do covalent compounds have low melting and boiling points?
Although the molecules are strong, the non-covalent intermolecular forces that hold the covalent molecules together are weak
True or false: Covalent compounds are insoluble
Sometimes soluble; sometimes insoluble - depends on the intermolecular bonding with solvent
How do you get a polar covalent bond?
Between atoms that have a significant difference in electronegativity, but not enough to form an ionic bond.