Studied by 3 people
what is an allotrope?
chemical elements that exist in 2 or more different forms in the same physical state (carbon as diamond graphite)
what is covalent bond?
a bond between atoms formed when atoms share electrons to achieve a full outer shell of electrons
what is a double bond?
a covalent bond resulting from the sharing of 4 electrons (2 pairs) between 2 atoms
what is an intermolecular force?
weak attractive forces between molecules (when a simple molecular substance melts or boils, the intermolecular forces are broken)
what is a molecule?
a collection of 2 or more atoms held together by chemical bonds
what are properties of a giant covalent structure?
solid at room temperature, very high melting and boiling points as large amounts of energy are needed to overcome strong covalent bonds
what are properties for a diamond covalent structure?
hard, used for cutting tools (drills), no free delocalised electrons, cannot conduct electricity
what are the properties of a graphite covalent structure?
soft and slippery, can conduct electricity, layers of hexagonal rings
what are properties of simple molecules?
low melting and boiling points, conductor of electricity
Note 
Flashcard (25)