Formula and equations

• What is a chemical formula of a compound?

  it shows us the type of elements present in the compound and the number of each type of atom or ion present.
• What is a prefix?

  it tells us how many atoms are in the compound
• what does mono mean?


  one
• what does di mean


  two
• What does tetra mean?


  four
• What does tri mean?


  three
• What does penta mean?


  five
• What does hexa mean?


  six
• How can you work out the valency of a non metal?

  the valency is equal to the number of bonds an element forms (equals the number of half-filled electron clouds)
• Why do noble gases not combined with other atoms?

  they already have a full outer electron energy level
• why do atoms combined with other atoms?

  to get a full outer electron energy level
• How is the valency of metals shown?


  it's shown by means of Roman numerals by the name
• How can you find the valency of a group ion?

  the valency is the same as the number of charges on the ion
• What would a compounds name end in if it contained two atoms?


  -ide
• What would a compound containing a element and oxygen end in?


  -ate or -ite
• What order should a compound name be written in?

  The order in which comes first on the periodic table
• What is a balanced equation?

  An equation that used chemical symbols in which the number of atoms of each element on both sides are the same
• What do you have to include when writing ionic equations?

  Charges (e.g. 2+, 3-)
• What do state symbols tell us?

  If the element/compund is soild, gas, liquid, etc
• What does hepta mean?

  seven
• What does octa mean?

  eight