Back To Basic Science

Question 1

Definition of matter

Answer 1

Is anything that takes up space.

Measured in kg

Either solid, liquid, gas s made up of atoms

Question 2

What is volume

Answer 2

15 the amount Of space that matter takes up

Question 3

What is a solid

Answer 3

Retains a fixed share

Particles closely packed together in a regular structure

Vibrate in a fixed position

Not compressed

Question 4

What is a liquid

Answer 4

They take up the shape of the container

Closely packed together but no regular arrangement

Vibrates move past each other

Not easily compressed

Question 5

What is a gas

Answer 5

Take up shape of container they occupy

Particles spread out with particular Arrangement

. Move freely and easily compressed

Question 6

What is density and what is its units

Answer 6

Density is the amount of mass per unit volume

Describes how closely packed together particles are

Kg/m*3

Question 7

What is the definition of weight and its units ?

Answer 7

Weight of an object is the force of gravity acting upon its mass

Is the downwards force on an object

Newtons

Question 8

What is force, the equation and units?

Answer 8

Is a rush, a pull a other action that changes an objects motion

F= m x a m=mass. A-acceleration

Newtons

Question 9

Definition of work, its equation and units?

Answer 9

Is an expression of the force applied to an object times distance across which it is applied

W=F x d

Joules J

Question 10

What is energy and the types

Answer 10

Ability to do work

Potential energy= energy that is stored

Kinetic energy= energy being expended

Question 11

When is there no net charge in an atom

Answer 11

Has same number of protons and electrons they cancel each other out

Question 12

What is binding energy and how do you measure this

Answer 12

The energy that holds nucleus together

Is a nuclear energy

Is a measure of the amount of energy needed to split the atom

Question 13

What is the binding energy dependent of

Answer 13

How close elections are to nucleus

Now many protons in nucleus

Closer é to nucleus the stronger this energy is

Question 14

What is the formula of how much each shell can hold electrons

Answer 14

2n*2. N= number of shells

Question 15

What are the shell numbers and letters

Answer 15

K =1

L=2

M =3
N=4
O=5

Question 16

What is ionisation

Answer 16

When an election is removed from its orbit by being struck with an energy greater than the binding energy

Atom turns into an lon

Question 17

What happens when ionisation occurs in shell near to nucleus

Answer 17

Electrons from outer shells will drop down to fill the inner shell vacancy

A vacancy in the shell causes unstable

Question 18

What s electromagnetic radiation

Answer 18

Is the energy released when ionisation takes place.

Question 19

What is conduction and how is it caused and give examples of good conductors

Answer 19

Is heat or electricity transferred through materials

Caused by collisions between tree elections and ions

Metals are the best as have high number of free elections.

Liquids are poor conductors as they have weak forces between particles

Question 20

What is convection

Answer 20

Occurs when a fluid is heated causing movement of particles in liquids or gases

Cold liquids are more denser so move to the bottom

Question 21

What is radiation

Answer 21

Is when energy moves from one place to another in a form of waves or particles

Thermal radiation is the only way heat can travel through a vacuum

Question 22

Explain the mechanism of heat transfer

Answer 22

Conduction - heat transfer through touch

Convection- use sets movement of fluid for heat transfer

Radiation uses electromagnetic waves to transfer heat

Question 23

What are electromagnetic waves

Answer 23

Is a wave created as a result of vibration between an electric field and a magnetic field

Question 24

What is ionising radiation

Answer 24

A subatomic particles wit enough energy to break away an electron from an atom causing the atom to become an ion or charged

Gamma rays
X rays

Question 25

What is non ionising radiation

Answer 25

Low energy radiation that doesn’t have enough energy to remove an electron from an atom

Infrared radiation
Ultrasound light

Question 26

What are the 7 electromagnetic waves

Answer 26

Radiation
Microwaves
Infrared
Visible light
Ultraviolet
X rays
Game rays. Biggest wavelength. Lowest Bb. frequency

Question 27

What is the EM spectrum

Answer 27

Is the range of all types of EM radiation

Question 28

How are em waves composed

Answer 28

By electric and magnetic feilds oscillating

Question 29

What are elements

Answer 29

A chemical element that cannot be broken down

They are composed of similar atomic numbers

Question 30

What are isotopes

Answer 30

Are atoms with the same number of protons but different number of neutrons

Have the same chemical properties but different physical properties

Question 31

What is the atomic mass number

Answer 31

Number of protons and neutrons in an atom

At the bottom of the

Question 32

What is atomic number

Answer 32

Number of protons and electrons in an atom

At the top

Question 33

What is atomic number

Answer 33

Number of protons and electrons in an atom

At the top