Chem topic 2

• physical changes

  do not alter molecular/chemical structure
• freezing

  liquid to solid
• melting

  solid to liquid
• condensation

  gas to liquid
• vaporization

  liquid to gas
• sublimation

  solid to gas
• deposition

  gas to solid
• alloy

  mixture of metals
• oxidation state

  describes degree of oxidation of an atom in a chemical compound
• insulator

  no electrons can go through
• ionic compounds

  do not share but steal electrons
• molecular/covalent compounds

  share electrons
• conductivity is a _ property

  physical
• if a new substance is formed because of property, it is a _ property

  chemical
• changing through phases is a _ change

  physical
• melting/boiling/freezing point is a _ property

  physical
• ionic compounds are usually between

  metals and non metals
• molecular/covalent compounds are usually between

  non metals/metalloids
• what is the roman prefix for 1?

  mono
• what is the roman prefix for 2?

  di
• what is the roman prefix for 3?

  tri
• what is the roman prefix for 4?

  tetra
• what is the roman prefix for 5?

  penta
• what is the roman prefix for 6?

  hex
• what is the roman prefix for 7?

  hepta
• what is the roman prefix for 8?

  octa
• what is the roman prefix for 9?

  nona
• what is the roman prefix for 10?

  deca
• when do you use roman numerals in naming?

  after a transition metal
• polyatomic ions

  contain more than two ions
• when you have to have multiples of a polyatomic ion with a subscript, what do you do when making a formula?

  put parentheses around the polyatomic ion
• when would you use roman prefixes?

  when naming molecular compounds