3.1

Question 1

When is an atom negative

Answer 1

When there are more electrons than protons

Question 2

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

Answer 2

Electricity

Question 3

What are positive and negative charged atoms called

Answer 3

Ions

Question 4

When is an atom positive

Answer 4

When there are more protons and less electrons

Question 5

What is a the charge of a single electron

Answer 5

-0.1602 X10-18 C (Coulombs)

Question 6

What is the charge of a single proton

Answer 6

+ 0.1602 X10-18 C

Question 7

When is an atom neutral

Answer 7

When number of protons = number of electrons

Question 8

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

Answer 8

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

Question 9

Examples of insulators or non conductors

Answer 9

Mica and porcelain

Question 10

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

Answer 10

3V exceeding

Question 11

How many electrons are shared in semiconductors

Answer 11

8

Question 12

How is conductivity produced

Answer 12

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

Question 13

Examples of semiconductors

Answer 13

Silicon and Germanuim

Question 14

How can matter be broken down into atoms

Answer 14

By the use of chemicals

Question 15

What are the four effects that electricity creates

Answer 15

Heat
Magnetic action
Light
Chemical action

Question 16

Electric current is what

Answer 16

A flow of electrons

Question 17

How many electrons in outer shell of semiconductors

Answer 17

4

Question 18

What is a charged atom known as?

Answer 18

Ionised

Question 19

A good conductor will have what characteristics

Answer 19

Less than 4 electrons in the outer orbit

Question 20

High density allows what for the electrons

Answer 20

To separate and move freely

Question 21

Do electrons have a mass

Answer 21

No

Question 22

What voltage is needed for electrons to be removed in conductors

Answer 22

No voltage is required

Question 23

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

Answer 23

They separate and move freely

Question 24

What is in the nucleus atom

Answer 24

Protons and Neutrons

Question 25

What are positive and negative charged atoms called

Answer 25

Ions

Question 26

Examples of conductors

Answer 26

Copper,aluminium and carbon

Question 27

In conductor, how are the atoms arranged

Answer 27

Closed packed in a crystal lattice

Question 28

When is an atom positive

Answer 28

When there are more protons and less electrons

Question 29

In semiconductors what voltage is needed to remove the electrons

Answer 29

Less than 3V

Question 30

Types of thermocouple

Answer 30

Alumel and chromed