Chemistry Exam (Student book )

• On average each person in Europe causes the production of 5 tonnes of waste each year
• Over Half of the rubbish ends up in landfill
• we need to recycle more of Our wastes , to save sources and energy
• All matter , wastes come in different states that have different properties
• Solid are easiest to dispose of in landfill sites , as they stay in one place
• Hazard = Corrosive , flammable and toxic
• In general , solids do not flow or change their shape
• solid waste = metal , paper and plastic
• Volume = the amount of space that is take , and can be measured in cubic centimetre ( cm³ )
• Liquid can change their shape and flow , so liquid take the shape of their container
• Physical properties of gas = shape , volume and direction
• Many waste gas are released directly into the atmosphere where they can caurse harm to environment
• Density is the mass of a certain Volume of material , it is measured in units such as Kilogram per cubic centimetre
• Particle theory :

  • All matter is made up of tiny particles
  • The particles are moving all the time
  • There are forces of attractions holding the particles together
  • the forces vary in strength in the different states of matter
• solid

  • particles are held CIosly together
  • by Strong force of attractions
  • The particles are moved in vibrate
• Liquid

  • particles are held closly together
  • by fairy strong force attraction
  • move past each other
• Gas

  • particles are far apart from each other
  • by weak force of attraction
  • move in all Directions
• Since the solute particles are so spread out , you can then see through the solution
• I nanometer = 0.000000001 m