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St. George's College

Subject: 7th CHEMISTRY

Class: Particulate Nature of Matter

Teacher's notes

Objectives

Vocabulary Link and Learn

Date: March 17th

Prepared by

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7th Beethoven ‐ Branches of Chemistry Name

Oral Intervention

Coin

Chocolate

Ariana Gabriel  Andrea  Abraham  Giacomo  Fabiana  Sinead  Liliam  Francesca  Rodrigo  Andres  Stefano  Jean Pierre  Diego  Rodrigo  Luis  Andrea Sebastián  Ivanna  Camila  Carlos  Aarón  Paola Enrique  Alessandra  Irma  Sophia Naomi  Kiara  Christopher 

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7th Mozart‐ Branches of Chemistry Name

Oral Intervention

Coin

Chocolate

Nicole Luis Luciana Antonella Valeria Ch. Valeria C. Analucía Camila Franco  Ramiro  Sara  Alicia  José Luis  Sergio  Roberto Giancarlo  Fiorella  Gabriela  Steffano  Javier 

Roberto R.  Diego  Luis Fernando  Sebastián  Julio  Sherley  César  Vilma  Alessandra V. 

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What is Matter? Matter is everything around us, that has mass and occupies space.

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ATOMIC THEORIES John Dalton (1808): He had no knowledge about protons, electrons,  neutrons, but he realized that differences in substances' atoms made  their properties different. He proposed his atomic theory under  these terms: • All matter is made up of tiny particles called Atoms. • All atoms of a given element are alike, but are different from the  atoms of any different atom. • Compound are formed when atoms of different elements combine  in fixed proportions. • A chemical reaction involves rearrangement of atoms, not a  change in the atoms themselves.

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These wooden balls were used to represent  the first atomic model by John Dalton. Science Museum, England.

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J. J. Thomson • While investigating electricity, he identified an electrically‐ charged particle that he called an electron.  • A tiny particle, much smaller than the atom, and it had a  negative electric charge.  • But if atoms are not charged, how come there is a  subatomic particle with a negative charge?  • He answered saying that electrons were embedded in a  sphere of positive charges like "raisins in a plum pudding". • The pudding would represent the positive charges, and the  raisins the electrons, making the atom electrically neutral.

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Ernest Rutherford • He tested the plum‐pudding model by shooting  positively‐charged particles at a gold foil as bullets.  • He observed that most of them passed through, but  a few bounced back.  • He concluded that the plum‐pudding model was  wrong, suggesting in 1911 that the atom was mostly  empty space, hence the particles passing through.  • Those that bounced back were repelled by a strong  positive charge concentrated in a small part of the  atom.  • Rutherford suggested that electrons should revolve  around a positively‐charged nucleus. 

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Niels Bohr • He suggested in 1913 that electrons orbit at different distances  from the nucleus, when the electron changes orbit it gives off  energy. • Today, electrons are shown in a "cloud" around the nucleus,  called probabilistic region.

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Which of these statements is correct? 1.

Atoms are made up of electrons, neutrons and protons.

2. Atoms do not contain electrons but they do contain protons and neutrons.

3. Atoms never contain neutrons Click here for the answer

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Which of these statements is correct?

1.

Electrons are positively charged

2. Neutrons do not weigh anything

3. Protons are found inside the nucleus Click here for the answer

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Label the diagram of the atom Click here for the answer

{

Protons

Electrons

Nucleus

Neutrons 15


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Resources Used Slide  (Group)

Resource

Description

Origin

G1 ‐ 2

Image

Beethoven

http://bit.ly/Q7ggk 

G1 ‐ 3

Image

Mozart

http://bit.ly/18LkW6 

G1 ‐ 4  Images 

Black Hole Sand falling Eye of hurricane

http://bit.ly/aFjIf http://bit.ly/KPlLQ http://bit.ly/JrxKK

G1 ‐ 6

Wooden Balls Elements 

http://bit.ly/JCInm http://bit.ly/PvvMp 

Images

G1 ‐ 8  Images 

JJ Thomson http://bit.ly/Qpn0G  Cathode Ray Tube http://bit.ly/aTsuR  Raisins in a Pudding   http://bit.ly/yuNB 

G1 ‐ 10  Animation 

Rutherford's Model  http://bit.ly/11YT09

G1 ‐ 11  Animation 

Bohr's Model 

http://bit.ly/13Q7PT

G1 ‐ 12  Animation 

Plasma

Unknown

Chemistry

http://bit.ly/18R0M

Atom of Helium 

http://bit.ly/JtON

Chemistry

http://bit.ly/18R0M

G1 ‐ 13,14,15,16 

Activities

G1 ‐ 17  Animation  G2 ‐ 7,8,9 Activities 

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Teacher's Notes This class has been designed to cover the topics of Particulate Nature of  Matter from Monday March 16th till Friday March 20th. For further knowledge about this topic:  1. Conduct a thorough search under the topic: Particulate Nature of  Matter on the Web, books and magazines. 2. If findings are not specific, ask your teacher for suggestions.

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Objectives • Describe and analyze the nature and components of  Matter. • Identify and describe the experiments that lead to the  different models of atomic theory.

Note: All, or most, of the objectives will be covered during class time,  however the student must be responsible for those objectives not covered or concluded.

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Vocabulary • • • • • • •

Matter: Atom: Nucleus: Electronic Cloud: Proton: Neutron: Electron:

Note: Most of the vocabulary words will be covered during class time,  however the student must be responsible for those words not covered or concluded.

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Link and Learn You can visit the following websites to improve your understanding on  the present topic: • • • • • •

http://bit.ly/PvvMp http://bit.ly/KCmja www.sanjorge.edu.pe http://science‐learning2009.wikispaces.com http://learningandscience.blogspot.com http://libraryatstgeorge.blogspot.com

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Prepared by

Gerardo LAZARO Science Lead Teacher Email: glazaro@sanjorge.edu.pe Wiki: http://science‐learning.wikispaces.com Blog: http://learningandscience.blogspot.com Twitter: http://twitter.com/glazaro

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The structure of an atom

Nucleus

Electrons

{

Neutrons

Protons Click here to go back

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The correct statement is ...

1.

Electrons are positively charged

2. Neutrons do not weigh anything

3. Protons are found inside the nucleus Click here to go back

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The correct statement is ...

1. Atoms are made up of electrons, neutrons and protons.

2. Atoms do not contain electrons but they do contain protons and neutrons.

3. Atoms never contain neutrons Click here to go back

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Attachments

7th Chemistry ­ Reading 1 ­ Branches of Chemistry ­ Supergoo to the Rescue.docx 7th Chemistry ­ Reading 1 ­ Branches of Chemistry ­ Graphene's Superstrength.docx 7th Chemistry ­ Reading 1 ­ Branches of Chemistry ­ Meteorites may have sparked life on earth.docx 7th Chemistry ­ Reading 1 ­ Branches of Chemistry ­ Plastic munching microbes.docx

7th Chamistry - Particulate Nature of Matter  

7th Chemistry - Class 3

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