P1 - matter (from textbook)

Question 1

describe dalton’s ideas

Answer 1

-all the atoms in an element are the same
-the atoms in one element are different from the atoms in all other elements

Question 2

describe thomsons’s ideas

Answer 2

plum pudding model:
-atom is positive mass with negative electrons embedded in it

Question 3

describe rutherford’s model

Answer 3

-nucleus is tiny + positively charged + very dense
-electrons orbit it

Question 4

describe bohr’s model

Answer 4

-same as rutherford’s model
-electrons are in fixed orbits around the nucleus

Question 5

define specific heat capacity

Answer 5

energy needed to raise the temperature of 1kg of a material by 1 degree celsius

Question 6

when you melt ice why is there no temperature rise???

Answer 6

because the energy transferred is breaking the attractive forces between the water molecules

Question 7

why does atmospheric pressure decrease as you go up?

Answer 7

because the air pressure at the bottom is greater