Chemistry paper 1

Cards (20)

  • What are the 5 main seperating techniques?
    1. Filtration
    2. Crystallisation
    3. Simple distillation
    4. Fractional distillation
    5. Chromatography
  • What is the name of group 0, 1 and 7
    0 = Noble gases
    1 = alkali metals
    7 = Halogens
  • What did Bohr discover?
    Adapated the nuclear model and discovered electrons orbit the nucleus
  • What did Chadwick discover
    Neutrons
  • What did Dalton discover
    existence of atoms through the atomic theory
  • What did Mendeleev discover? 

    Order of elements in periodic table and left gaps for undiscovered elements
  • What did Democritus discover?
    particles
  • What did Thomson discover?
    electron
  • What did Rutherford discover?

    Nucleus
  • What was the Rutherford‘s nuclear model?
    Heavy positively charged nucleus surrounded by a lot of empty space and lighter negatively charged electrons circulating.
  • What was Thomsons plum pudding model?
    Electrons embedded in a sphere of positive charge like a blueberry muffin
  • Properties of Group 0
    • unreactive as they have a full outershell
    • do not conduct electricity or heat as they have no delocalised electrons
    • boiling point increases down the group as the mass increases therefore more energy is required to break them
  • Properties of Group 1
    • reactive as they do not have a full outershell
    • melting and boiling point decreases as you go down as the mass decreases therefore less energy is required to break them
    • conducts electricity and heat as it has delocalised electrons
  • Properties of Group 7
    • highly reactive as they are so close to gaining a full outer shell
    • boiling point increases as you go down because the mass increases therefore more energy is required to break them
  • Transitional metals compared to group 1 metals?
    • transition metals are much stronger, denser and harder
    • Transition metals have higher melting points
  • How do you calculate the number of neutrons, protons and electrons in an atom?
    Protons = mass number
    Electrons = atomic number
    Neutrons = mass number - atomic number
  • Reactivity series?
  • What is an exothermic reaction?
    An exothermic reaction is a chemical reaction that releases heat to its surroundings.
  • What is an endothermic reaction? 

    When energy is taken in from its surroundings
  • What is the process electrolysis?
    using electricity to break down electrolytes to form elements