3.1 Flashcards

1
Q

When is an atom negative

A

When there are more electrons than protons

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2
Q

When electrons is moved away from the atom what form of energy is produced

A

Electricity

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3
Q

What are positive and negative charged atoms called

A

Ions

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4
Q

When is an atom positive

A

When there are more protons and less electrons

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5
Q

What is a the charge of a single electron

A

-0.1602 X10-18 C (Coulombs)

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6
Q

What is the charge of a single proton

A

+ 0.1602 X10-18 C

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7
Q

When is an atom neutral

A

When number of protons = number of electrons

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8
Q

How are electrons connected in an atom for non conductor or insulator

A

Tightly packed and more than 4 in the outer orbit, also no free electrons

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9
Q

Examples of insulators or non conductors

A

Mica and porcelain

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10
Q

In insulators, what voltage is needed to take away electrons.

A

3V exceeding

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11
Q

How many electrons are shared in semiconductors

A

8

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12
Q

How is conductivity produced

A

By adding other foreign atoms (doping) by heat or light

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13
Q

Examples of semiconductors

A

Silicon and Germanuim

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14
Q

How can matter be broken down into atoms

A

By the use of chemicals

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15
Q

What are the four effects that electricity creates

A

Heat
Magnetic action
Light
Chemical action

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16
Q

Electric current is what

A

A flow of electrons

17
Q

How many electrons in outer shell of semiconductors

18
Q

What is a charged atom known as?

19
Q

A good conductor will have what characteristics

A

Less than 4 electrons in the outer orbit

20
Q

High density allows what for the electrons

A

To separate and move freely

21
Q

Do electrons have a mass

22
Q

What voltage is needed for electrons to be removed in conductors

A

No voltage is required

23
Q

What happens to the electrons on the outer layer of a conductor due to high density

A

They separate and move freely

24
Q

What is in the nucleus atom

A

Protons and Neutrons

25
What are positive and negative charged atoms called
Ions
26
Examples of conductors
Copper,aluminium and carbon
27
In conductor, how are the atoms arranged
Closed packed in a crystal lattice
28
When is an atom positive
When there are more protons and less electrons
29
In semiconductors what voltage is needed to remove the electrons
Less than 3V
30
Types of thermocouple
Alumel and chromed