4.1.2.1 Stages in the Describe how and why the 1 Create a timeline for the WS 1.1 development of atomic atomic model has changed history of the atomic model. Explain, with examples, models: over time. Extended writing: why new data from Dalton atoms (1804) Describe the difference experiments or Describe the differences spherical atoms between the plum-pudding observations led to – between the plum-pudding that cannot be split model of the atom and the changes in atomic model, nuclear model and up to explain the nuclear model of the atom. models. atomic model. properties of gases Describe why the new WS 1.1 Describe why changes to the and the formulae of evidence from the atomic model happened. Decide whether or not compounds scattering experiment led to given data supports a Plum pudding High demand: a change in the atomic particular theory. (1897) it was found – model. Describe the experimental that the mass of techniques involved in the electrons, which had history of the atomic model. recently been discovered, was very Explain how the experimental much less than the techniques work. mass of atoms so they must be particles the nuclear atom (1911) an – experiment which showed that most of the alpha particles directed at thin gold foil passed through
4.1.2.1 Stages in the development of atomic models: Dalton atoms (1804) – spherical atoms that cannot be split up to explain the properties of gases and the formulae of compounds Plum pudding (1897) – it was found that the mass of electrons, which had recently been discovered, was very much less than the mass of atoms so they must be particles the nuclear atom (1911) – an experiment which showed that most of the alpha particles directed at thin gold foil passed through Describe how and why the atomic model has changed over time. Describe the difference between the plum-pudding model of the atom and the nuclear model of the atom. Describe why the new evidence from the scattering experiment led to a change in the atomic model. 1 Create a timeline for the history of the atomic model. Extended writing: Describe the differences between the plum-pudding model, nuclear model and atomic model. Describe why changes to the atomic model happened. High demand: Describe the experimental techniques involved in the history of the atomic model. Explain how the experimental techniques work. WS 1.1 Explain, with examples, why new data from experiments or observations led to changes in atomic models. WS 1.1 Decide whether or not given data supports a particular theory.
AQA-8465-SOW-BBLOCK.DOCX