science revision - matter

• How many types of atom are found in an element

  One type of atom
• What is a compound

  a substance made from more than one

  type of atom chemically bonded in a fixed

  ratio.
• Name 3 properties of metals

  shiny -

  good conductors

  high melting point

  Malleable

  ductile
• proporties of non metals 


  poor conductors , dull , low MP and BP , brittle
• What are group 1 metals called

  alkali metals
• what are group 7 metals called

  halogens
• How would you describe group 8 elements (noble gases )

  unreactive
• Groups are 


  columns in the periodic table
• periods are 


  rows in the periodic table
• How did Mendeleev order the

  elements?

  In groups with

  similar chemical properties
• Name the compound sodium and bromine

  sodium bromide
• SO2


  sulphur dioxide
• calcium , sulphur and oxygen

  calcium sulphate
• magnesium and oxygen 


  magnesium oxide
• cuCO3


  copper carbonate
• Describe polymers


  Very long chain molecules of repeating units. There are

  natural and synthetic polymers.
• are teh total mass of the reactants the same?

  yes
• How are transition metals different

  to Group 1 metals:

  • They are harder and stronger

  • They are less reactive
• What is the test for hydrogen gas?

  squeaky pop test
• what are the reactants and what are the products in this world equation potassium + chlorine - potassium chloride

  potassium and chlorine - reactants , pattasium chloride - products
• Are the properties of reactants and products the same?

  No
• What is trend for reactivity as you go down Group 7?

  Reactivity decreases down the group. Fluorine is the most reactive.
• What is the trend of melting and boiling points as you go down

  Group 7?

  melting and boiling points increase as you go down
• what state is fluorine

  gas
• what state is chlorine


  gas
• what state is iodine

  solid
• what state is bromine

  liquid
• what happens when sodium mixes with water

  it floats and fizzes
• what happens when potassium mixes with water

  it floats, fizzes and a lilac flame appears
• What is trend for reactivity as you go down Group 1 metals?

  It gets more reactive as you go down
• What happens to the melting point of

  Group 1 metals down the group?

  melting points decrease