Wednesday 9-30 and Thursday 10-01 Mrs. Wilson

** TURN IN YOUR BAKING SODA LABS Objectives 1. Describe and understand the experiments and conclusions related to the history of the atom. 2. Describe and understand basic atomic structure and the properties of subatomic particles. 3. Simulate Rutherford’s gold foil experiment and relate your findings to basic atomic structure. ** TURN IN YOUR BAKING SODA LABS Homework: Unit 2 Packet, pg. 30: Hwk. 2.1 – Daily Quiz Next Class

Kahoot … to review your basic atomic structure knowledge, go to kahoot.it After the Kahoot game, please use your prior knowledge and the knowledge you gain through the Kahoot to complete the Basic Atomic Structure Guided Notes. Check your work with a partner to make sure you agree.

dense nucleus + 1 + 1 1 amu 1 amu nucleus - 1 ~0.0005 amu 1 amu nucleus - 1 ~0.0005 amu electron cloud un 1.66 x 10-27 kg (also: 1/12th the mass of a carbon-12 atom) dense nucleus positive atom electrons energy levels negative neutral atoms zero

(small, very dense, holds most of the mass) Drawing of an Atom Most of the atom’s volume = “empty space” Nucleus (small, very dense, holds most of the mass)

protons 1 6 atomic number lower element rare nuclear

~ 0 protons number mass higher

neutral protons electrons atomic protons

Where did our knowledge of basic atomic structure come from? - How did Democritus and Dalton first help us understand the nature of matter?

“Matter is made up of tiny indivisible particles called atomos.” Atoms of different elements differed in size, shape and temperature. Atoms move through empty space. Atoms are solid and indestructible. Size, shape and movement determine properties. None (no experiment)

Dalton’s Postulates Atoms are small and indivisible. (a small, indivisible particle) Revived Democritus’ ideas. Studied many chemical reactions to support his hypotheses. Determined mass ratios of elements involved in reactions. Dalton’s Postulates Atoms are small and indivisible. Atoms of an element have identical properties. Atoms of different elements have different properties. Atoms are not created or destroyed in chemical reactions. Compounds contain a FIXED ratio of different elements. (Law of Definite Proportions)

Where did our knowledge of basic atomic structure come from? - Form groups of four – your “home group”. - Each person is responsible for reading an article about some scientists and their experiments and conclusions relevant to our understanding of atomic structure. - Each person in a group will get different scientist(s): Thomson, Rutherford, Bohr, and Schrodinger/Chadwick.

Once you have your “scientist” assignment, pair up with another student in the class who also has your scientist(s). Work with your partner. On your History of the Atomic Theory handout, describe or draw/label their experiment or thought process, their results, their conclusions, and draw an atomic model that incorporates their conclusions. Once your home group comes back together, teach each other about your scientist(s). Do not let them copy! Explain to them what is most important to know about your scientist.

SONG BREAK https://www.youtube.com/watch?v=07yDiELe83Y

Kahoot Again! kahoot.it

2.1b: Atomic Target Activity Objective: Use a physical model to simulate Rutherford’s gold foil experiment and draw conclusions regarding the structure of the atom. 1. Read the text and complete the Questions before the objective, and the Pre-Lab questions. You will need to use the Rutherford section of your notes.

Perform the activity… …and complete the Post-Lab Questions in your packet.

Exit Ticket List, on your index card: 3 facts you learned today about the history of atomic theory. 2 facts you learned today about basic atomic structure. 1 question you still have about atomic structure or the history of atomic theory. Homework: Pg. 30 in Unit 2 Packet – Homework 2.1. Daily Quiz next class.