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# Electrical Nature of Matter PowerPoint PPT Presentation

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

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## Electrical Nature of Matter

### 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.

• 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.

### 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”

### 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

### 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.

### 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.

### 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

### 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.

### 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)

### 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)

### Homework

Page 273 – questions 1-5