Week 3-4 Chemistry Vocabulary
1. Metallic bonding - the chemical bond characteristic of metals, in which mobile valence electrons are shared among atoms in a usually stable crystalline structure
2. Malleability – the ability to be hammered or beaten into thin sheets
3. Ductility – the ability to be pulled into wire
4. Lewis formulas - a graphical representation of the outer electrons of bonded elements
5. Single bond – a pair of electrons (one from each atom) that is shared between two atoms, often represented by a long dash
6. Double bond two pairs of electrons (one from each atom) that is shared between two atoms, often represented by two long dashes
7. Triple bond – three pairs of electrons (one from each atom) that is shared between two atoms, often represented by three long dashes
8. Lone pair – an unshared pair of electrons that belong to one atom
Week 3-5 Chemistry Vocabulary
1. VSEPR theory – Valence Shell Electron Pair Repulsion - states the repulsion between the sets of valence electrons surrounding an atom causes these sets to be oriented as far apart as possible.
2. Polar covalent bond – a type of bond that forms when electrons are not shared equally.
3. Non-polar covalent bond - a type of bond that forms when electrons are shared equally.
4. Mole – the SI base unit used to measure the amount of a substance. One mole is the amount of a pure substance that contains 6.02 X 1023 representative particles
5. Avogadro’s number – the number 6.02 X 1023 which is the number of representative particles in a mole. Named in honor of Amedeo Avogadro.
6. Molar mass – the mass in grams of one mole of any pure substance.
7. Dimensional analysis – a systematic approach to problem solving that uses conversion factors to move from one unit to another.
8. Atomic mass unit – a mass exactly equal to 1/12 the mass of one carbon-12 atom.
9. Molecular mass – the sum of the atomic masses in the molecule.