General Chemistry Lesson plan The discovery of the nucleus. (Rutherford's Experiment)

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Presentation transcript:

General Chemistry Lesson plan The discovery of the nucleus. (Rutherford's Experiment)

Pennsylvania Academic Standards for Science: Unifying themes of science. Provide big ideas that integrate with significant concepts Physical Science, Physics, and Chemistry. Apply concepts about the structure of matter.

Assessment techniques  Concept mapping: E.g. Venn diagram  Questions and answers  Worksheet.

Enduring Understandings  Atom is the basic building block of matter.  Exploring the structure of the atom leads to conceptual understanding of the structure of matter.

Important knowledge concept principles skill and facts  Models describe small things & difficult concepts  Theories can be changed with new info. & discoveries  Describe how e - s p + s, and n 0 s influence the identity & identity of an atom

Objectives  Explain protons, Electrons, and neutron.  Define composition, & position of nucleus  State the mass and charge of the subatomic particles.  Draw several historical models of the atom. (Dalton, Thomson, & Rutherford)

Methods  Demonstrations  Hands on using tissue, darts sponge and pins  Small group discussion  Computer animations stry/essentialchemistry/flash/ruther1 4.swf stry/essentialchemistry/flash/ruther1 4.swf  Do the assignment

Materials  Computer animations or simulation/Animation  Thin Sponge and needles  Napkins and darts  Foil paper (to mimic gold foil)

Assignment  Draw and label diagrams to show what most people thought the atom looked like before 1911 and what most people today think it looks like. Before 1911Today  Explain why the gold leaf experiment showed that the plum pudding model of the atom could not be accurate.  Rutherford was the first person to split the atom. List some of the benefits and problems which have resulted from this knowledge. BenefitsProblems

Procedures  Warm up: State the 5 points of Dalton’s atomic theory  Introduction Point out that that Dalton’s theory has been modified. (Atoms are divisible) Briefly mention Thomson’s discovery of electrons Briefly introduce Rutherford’s exp.

Procedure cont. Hands on Hand in materials  Thin Sponge and needles  Napkins and darts  Ask students to pierce the sponge and napkin with the needle and the dart and write their observations.  A few groups share their observations

Procedure cont. Imagination How would explain a phenomenon where a dart bounces back off a napkin target? All students MUST WRITE THEIR RESPONSES. A few good ones will share. Watch the animation/simulation try/essentialchemistry/flash/ruther14.swf

References School Distirct of Philadelphia: planning and Scheduling timeline. ( ) Core curriculum standards alignment resources. Core curriculum resources. Holt chemistry by Myers, Oldham and Tocci

References cont. pedia/R/Rutherfords_experiment_an d_atomic_model.htm istry/essentialchemistry/flash/ruther 14.swfhttp:// istry/essentialchemistry/flash/ruther 14.swf /atomsandelementsstudentwor ksheets.pdf