P1- Matter

Question 1

What was Thompsons model called

Answer 1

The “Plum pudding” model

Question 2

What did Thompson discover

Answer 2

The existance of the electron

Question 3

What where Thompsons ideas about the atom

Answer 3

An atom is a ball of positive charge with negative electrons embedded in it

Question 4

What was Rutherfords Atomic model called

Answer 4

The nueclear atom

Question 5

What was the experiment Rutherford conducted

Answer 5

Positively charged alpha particles were fired at thin gold foil.

Question 6

What where the results of Rutherfords experiment

Answer 6

• Most when straight through
• A few partially deflected
• Some fully reflected

Question 7

Why did some of the alpha particles fully reflect

Rutherfords experiment

Answer 7

Because they where reppled by the negitive electrons.

Question 8

What did Rutherford conclude from his experiment

Answer 8

• the mass of an atom is concentrated at its centre, the nucleus
• the nucleus is positively charged

Question 9

What was Bohrs atom models name

Answer 9

planetary model

Question 10

What did Bohr discover

Answer 10

The idea that electrons are found in shells (rings)

Question 11

What is the typical size of atoms or small molecules

Answer 11

1 × 10^(–10)m

Question 12

Define density

Answer 12

How closely packed the particles are in a solid, liquid or gas

Question 13

Mass is always __________

Answer 13

Conserved

Question 14

What two things can happen when you heat up a substance

Answer 14

• The energy stored increaces
• A change in state

Question 15

Define Specific heat capacity

Answer 15

The amount of heat energy required to raise the temperature of 1 kilogram of the substance by 1 degree Celsius

Question 16

Define Specific latent heat of fusion

Answer 16

The energy required to change the state of 1 kg of substance

Question 17

How do you increase preasure in a gass

Answer 17

• Reduce the container size
• Increase the tempurature
• Add more gass

Question 18

Why do the factors that increace pressure in gasses have that effect

Answer 18

Because the change causes there to be more frequent collisions with the container which exert an increased force.

Question 19

Can gasses be compressed

Answer 19

Yes gas is the only state that can be

Question 20

What happens when a gass is compressed

Answer 20

The pressure increaces

Question 21

What is the type of Pressure exterted on a force by pressure

Answer 21

Pressure produces a net force
at right angles to any surface

Question 22

What does work do to a Gas

Answer 22

It can increase the tempurature

Question 23

Why does atmosphereric pressure vary with height

Answer 23

• More or less particles above us
• More or less gravational pull

Question 24

What causes something to float

Answer 24

If the objects denisity is lower than the substance it is submerged in

Question 25

Why does pressure in liquids vary with depth

Answer 25

Because there is more or less liquid above you

Question 26

What is a vector

Answer 26

A unit of messure with both direction and magnitude

Question 27

What is newtons first law

Answer 27

Momentum is always conserved

Question 28

What is newtons second law

Answer 28

force = mass x accelaration