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Electrical Nature of Matter. Grade Nine Science. Question to Ponder. What happens when you rub a balloon against your hair? Does this action create electric charges?. What happens when you rub the balloon against your hair?. Both items have negative and positive charges.

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Electrical nature of matter l.jpg

Electrical Nature of Matter

Grade Nine Science


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Question to Ponder

  • What happens when you rub a balloon against your hair?

  • Does this action create electric charges?


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What happens when you rub the balloon against your hair?

  • Both items have negative and positive charges.

  • In fact, both items are said to be neutral

  • Since the balloon and your hair are comprised of two different materials one item wants the negative charges more.

  • One item becomes positive, the other negative

  • Now each item is said to be charged.


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Electrostatics: study of static electric charge.

  • Static electricity (When Charges DO NOT Move).

  • This is why the balloon can stick to the wall

  • This is a result of “The Law of Electric Charges”


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The Law of Electric Charges

  • Like charges repel one another, and unlike charges attract one another.

  • How would you test for this?

    • Place a known charge to an object with an unknown charge


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A Model for the Electrical Nature of Matter

  • The Bohr-Rutherford model helps us understand how matter is structured and how it behaves.

  • The main ideas of this model are presented on the next couple of slides.


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A Model for the Electrical Nature of Matter

  • All matter is made up of particles called atoms.

  • At the centre of each atom is a nucleus, with two kinds of particles: the positively charged proton and the uncharged neutron. Protons do not move from the nucleus when an atom becomes charged.


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A Model for the Electrical Nature of Matter

  • Negatively charged particles called electrons surrounds the nucleus. When atoms become charged, only the electrons move from atom to atom.

  • Like charges repel each other; unlike charges attract each other.

  • Some elements have a weaker attraction for its electrons than others and the electrons are able to move freely from atom to atom. A good example is copper


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A Model for the Electrical Nature of Matter

  • A single atom is always electrically neutral.

  • If an atom gains an extra electron, the net charge on the atom is negative and it is called a negative ion. If an atom loses an electron, the net charge on the atom is positive and it is called a positive ion.


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Negative Ions

If an atom gains an extra e-, the net charge on the atom is negative , and it is called a negative ion .

6 protons (6+) 6+

6 electrons (6-)7-

Neutral 0 (no charge) 1- (-ion)


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Positive Ions

If an atom loses an extra e-, the net charge on the atom is positive , and it is called a positive ion .

6 protons (6+) 6+

6 electrons (6-)4-

Neutral 0 (no charge) 2+ (+ion)


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Homework

Page 273 – questions 1-5


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