P1 - MATTER

Question 1

Models of the atom - Greeks

Answer 1

matter is made of indivisible particles - too small to see

Question 2

Models of the atom - Dalton

Answer 2

all atoms in an element are the same

Question 3

Models of the atom - Thomson

Answer 3

plum pudding model - discovered the electron - a negatively charged particle

Question 4

Models of the atom - Rutherford experiment

Answer 4

fired + alpha particles at a thin piece of gold - most went straight though, some were deflected through various angles - showed that there was a tiny + nucleus containing most of the atoms mass

Question 5

Models of the atom - Rutherfords model

Answer 5

ting + nucleus, negative electrons in orbit around it

Question 6

Models of the atom - Bohr’s model

Answer 6

electrons exist in shells (fixed orbits around nucleus)

Question 7

what is the size of an atom?

Answer 7

10^-10 m

Question 8

what is the size of an atoms nucleus?

Answer 8

10^-15 m

Question 9

what is the size of a molecule?

Answer 9

10^-8 m

Question 10

what does density (kg/m3) equal?

Answer 10

mass (kg) / volume (m3)

Question 11

which state has the highest density and why?

Answer 11

solid - the particles are tightly packed together so there is more mass per unit volume

Question 12

which state has the lowest density?

Answer 12

Gas