chem

• what is an atom


  Smallest particle of an element
• What is an element?


  a Substance that contains only ONE type of atom.
• Example of an element


  Oxygen
• What is a compound?

  2 or more elements chemically combined
• Example of a compound

  H2O
• What is a mixture?

  A combination of two or more substances that are not chemically combined
• Example of a mixture


  salt water
• whats the formula for working out the rf value


  distance travelled by compound/ distance travelled by solvent
• what are some differences between metals and non metals


  Metals are shiny, good conductors of heat and electricity, Non-metals are brittle, , and are not good conductors.
• what is group 1 on the periodic table called?

  alkali metals
• what is group 2 called

  alkaline earth metals
• what is group 3/7 called

  halogens
• what is group 0 called

  noble gases
• Which direction does group numbers go on

  Vertical
• Whoch directoon does period numbere go in

  Horizontal
• what is the word equation for lithiums reaction with water

  lithium + water -> lithium hydroxide + hydrogen
• What's a formulation?


  a mixture that has been designed as a useful product
• Example of a formulation


  Medicines
• What's a pure substance?

  A substance made from a single type of element or compound
• What is the particle diagram for an element


  All atoms are same and, together
• What is the particle diagram for a compound

  2 or more different atoms, all together
• What is the particle diagram for a mixture

  2 or more different atoms, not together, will be in seperate grouos based on their element
• When iron and sulfur combine to form iron sulfide, a ___ change takes place.

  chemical
• What is a silvery liquid combined with a colourless gas, giving an orange solod and why


  A compound becayse it changed state
• White solid combined with a red solid giving a pink solid which was then seperated back to normal

  Mixture, can be seperated,
• A grey solid and another grey solid, both of which conduct electricity, combined to gove a grey solid that also conducts electricity

  Mixture, same properties
• A colourless gas combined with anither colourless gas, makinf a loquid

  Compound, changed state
• Potassium + oxygen


  potassium oxide
• Magneisum + chlorine

  Magnesium chloride
• zinc + sulfur


  zinc sulfide
• lead + bromine


  Lead bromide
• How are compounds made

  chemical reactions
• properties of an element


  Made up of one type of atom

  Has a symbol
• properties of compounds


  2 or more dif atoms

  Has a formula

  Chemically combined

  Formed by a reaction

  Cannot b easily seperated

  Dif properties from its elements
• Properties of mixtures


  Has 2 or more dif atoms

  No formula

  Physically combined

  Formed by simple mixing

  Can be seperated

  Combined properties of its elementa
• What is paper chromatography?


  The seperation of mixtures of soluble substances by running a solvent through the micyure on the paper, which causes the substances to movr at different rates over paper
• What is ductile?


  Something ghat can be made into a wire
• Properties of metals


  Shiny, conducts energy, malleable, conducts heat
• properties of nonmetals


  dull, brittle, poor conductors of electricity and heat
• What is the periodic table?

  An arrangement of elements