Chemistry

• Phenolphthalein 


  Is pink in alkali and colourless in acidic
• Alkane 


  Formula $CₙH₂ₙ₊₂$
• Isomers


  Compound with the same molecular formula but different structural formulae
• Type of polymer formed from alkenes

  Addition polymer
• why are the crucible and contents heated for a extra 2 minutes?

  to ensure all the (..) has reacted
• Disadvantage of using a lid

  The gases can’t escape easily
• Why does the student stir the solution

  So there is a even distribution of heat
• State the color of copper(||) sulfate solution

  Blue
• relationship between temperature and rate of reaction

  Positive correlation
• How to tell if a substance is pure or a mixture

  By measuring the melting point ,if the melting point is sharp the substance is pure. If the melting point is a mixture of ranges the substance is a mixture.
• Which groups elements are all uncreactive

  Group 0
• Isotope 


  Atoms of the same element with the same number of protons but different number of neutrons
• Acid


  An acid is a proton donor
• Hydrocarbon 


  Is a compound that is made of hydrogen and carbon only
• Isomer


  Compounds with the same molecular formula but different structures
• Unsaturated 


  Are compounds that contain a carbon-carbon double bond
• Electrolysis 


  To break down molten or aqueous compounds using electricity
• Equilibrium 


  When the rate of forwards and backwards solution in a equilibrium are equal and when the concentration of products and reactants are constant
• Catalyst


  A substance that speeds up reactions by lowering the activation energy without being used up
• Compound 


  A substance that is made of two elements that are chemically combined
• Amphoteric


  Is an oxide that reacts with acids and bases
• Ionic bond


  Electrostatic forces of attraction between oppositely charged forces
• Characteristics of a homologous series

  • react similarly
  • general formula
  • same functional group
  • similar chemical properties
• Give the name of the compound with the formula NH,4NO

  ammonium nitrate
• State an environmental problem caused when sulfur dioxide gas dissolves in

  water in the atmosphere.

  Acid rain
• Identify a gas that makes up about 78% of the atmosphere.

  nitrogen
• Identify a gas produced by the thermal decomposition of calcium carbonate.

  carbon dioxide
• Which element is a liquid at room temperature?

  bromine
• methyl group


  CH,3
• test for hydrogen:

  Use a burning splint at the open end of the gas tube this creates a “squeaky pop”
• test for oxygen

  insert a glowing splint to the test tube of gas the splint will relight in oxygen
• test for carbon dioxide

  Bubble gas through lime water it will turn milky/cloudy
• functional group for alcohol

  OH
• Chlorine

  Gas and pale green at room temperature
• bromine

  Liquid and red-brown at room temperature
• Iodine

  Solid and grey at room temperature
• State why it is not safe to heat the evaporating basin directly with a Bunsen flame

  flammable
• What is metallic bonding

  Electrostatic attraction between positively charged particles and delocalized electrons
• Properties of aluminum

  Good conductor

  high melting point
• Alloy

  A mixture of two or more elements one of which is a metal