Chemistry2/10/14 – 2/14/14

2/10 Quiz review and WB p. 19-23 HW: Read TB: p.19-22 and take CN

2/11 Are atoms indivisible?WB: p. 24-28 HW: TB p.22 #1-4

2/12 Holiday2/13 Are atoms indivisible?

WB: p. 24-28 HW: Prepare presentation2/14 Are atoms indivisible?

WB: p 29-30 Group presentations

Date: 2/10/14 Objective: I can explore the idea of atoms by trying to isolate a single atom.

Bell Ringer: Bell ringer: 1. In figure 2, identify the independent variable.

2. According to the trend in figure 2, What happens to the amplitude as the period increases?

Amplitude

Date: 2/18/13 Objective: I can explore the idea of atoms by trying to isolate a single atom.

Independently complete Workbook page 19

Quiz for absent students

Date: 2/18/13 Objective: I can explore the idea of atoms by trying to isolate a single atom.

Now work with your group to complete Workbook page 19

Quiz for absent students

Date: 2/18/13 Objective: I can explore the idea of atoms by trying to isolate a single atom.

Workbook page 21Investigate

Date: 2/18/13 Objective: I can explore the idea of atoms by trying to isolate a single atom.

Workbook page 23Read

Atom Size comparison

Date: 2/18/13 Objective: I can explore the idea of atoms by trying to isolate a single atom.

Independently Read TB: p24-28 and take Cornell notes

Title WB p. 24

Atomic Theory Project WB p. 24-28Each group will develop a presentation

and present to the class

1. Circle the scientist you are researching2. As a group read information about

your scientist

Atomic Theory Project-Each group will develop a presentation and present to the class. Each member of the group will be responsible to complete one of the following1. What is your scientist’s claim?2. What is your scientist’s evidence, what experiment did they perform?3. What was your scientists conclusion?4. Create a drawing of the scientists findings picture of the atom) and the experiment

Atomic Theory Project- PosterScientist Name and information

Scientist Claim

Scientist Evidence

Scientist Conclusion

Drawing and pictures

• J.J. Thomson • Claim: The atom has negative and positive parts • Evidence: Evidence: He found electrons and subatomic particles when he was working with cathode ray tubes. He was working with glass tubes and

electricity and messed up and discovered electrons.• Conclusion: He said the atom was a sphere of positive electricity, with negative particles throughout. This came around right after he

discovered the electron. The raisin bun Model or thechocolate chip cookie model, or plum pudding model : Atoms are solid spheres made-up of a solid positive mass (or core) with tiny negative particles embedded in the positive core.

• Robert Millikan• Claim: Atoms have negatively charged particle with a small mass• Evidence: He wanted to find the electrical charge of electrons. He measured water droplets, and that wasn’t successful, so he measured oil

droplets, where all this proved electrons were negatively charged. • He performed the oil droplet experiment • Conclusion: the electron had a negative charge

• Rutherford’s The Planetary Model • Claim: The atom has a center mass and empty space• Evidence: He also discovered the atomic nucleus using others research and findings. To find this he did the Rutherford experiment. Briefly,

he used a thin foil made of gold metal to find positive and negative charges in an atom. • Conclusion: The Famous Gold Leaf Experiment proves that atom is mostly open space with dense nucleus in the middle and electrons on

the outside

• Bohr • Claim: Electrons are in energy levels• Evidence: Used Rutherford’s research and atomic spectra to prove that electrons are placed in definite orbitals (called shells) around the

nucleus.• Conclusion: Electrons in Definite energy Levels around the nucleus • •

J.J. Thomson

The raisin bun Model or thechocolate chip cookie model : Atoms are solid spheres made-up of a solid positive mass (or core) with tiny negative particles embedded in the positive core.

1897J.J. Thomson

He found electrons and subatomic particles when he was working with cathode ray tubes. He was working with glass tubes and electricity and messed up and discovered electrons.

http://www.phy.cam.ac.uk/cavendish/history/electron/jj_c1890.jpg

1897Plum Pudding Model

Discovered by J.J. Thomson. He said the atom was a sphere of positive electricity, with negative particles throughout. This came around right after he discovered the electron.

1897: J.J. Thomson:

Thomson took Crookes’ tube and used a magnet to bend the ray. The ray bent towards the positive side of the magnet. He concluded that the ray must have had a negative charge if it was attracted to the positive side. These negative charges became known as electrons

Thomson: continued• Thomson called his model

the “Plum Pudding Model”

• He called it this because he thought that there were positive and negative particles tightly packed together. The positive particles became known as protons.

1897: Thompson• Thompson has a

student named Ernst Rutherford.

• Lets skip ahead to the year 1911 to see what he has done to change the Plum Pudding model.

• Here we go…

1908Robert Millikan

He was by far the most famous American scientist. He wanted to find the electrical charge of electrons. He measured water droplets, and that wasn’t successful, so he measured oil droplets, where all this proved electrons were negatively charged. He also was a professor for many years, and wrote many textbooks on chemistry.

http://www.chemistryexplained.com/images/chfa_03_img0536.jpg

1911Ernest Rutherford

He ionized gas using radiation, and found alpha and beta waves. He used his research and the magnetic properties of iron to find radio waves. He also discovered the atomic nucleus using others research and findings. To find this he did the Rutherford experiment. Briefly, he used a thin foil made of gold metal to find positive and negative charges in an atom.

http://www.newgenevacenter.org/portrait/rutherford.jpg

• Rutherford’s The Planetary Model • Famous Gold Leaf Experiment proves that

atom is mostly open space with dense nucleus in the middle and electrons on the outside

                                                                  

                                                                                                                                                

                                                                      

       

The gold-foil experiment

• Electrons in Definite energy Levels around the nucleus

• Used atomic spectra to prove that electrons are placed in definite orbitals (called shells) around the nucleus.

Neils Bohr

1913Niels Bohr

Niels figured out the structure of the atom, and their radiations. He also discovered the principle of complementary. He introduced electrons from the book he wrote on the structure of the atom. He also started the basis of the quantum theory.

http://www.nrc-cnrc.gc.ca/education/elements/images/elements/Bohrium.jpg

1913The Bohr Model

http://en.wikipedia.org/wiki/Bohr_model

Niels Bohr discovered this atom. It shows a positively charged nucleus surrounded by electrons. This was mostly to explain the Rydberg formula. The Bohr model is a hydrogen model. It helps with the learning of the quantum theory.