Atomic Structure YEAR 9

Question 1

Dalton atomic model

Answer 1

Undivisible solid ball comprised of only one type of atom

Question 2

isotopes

Answer 2

atoms of an element which have different numbers of neutrons, but the same number of protons and electrons

Question 3

Plum pudding model

Answer 3

Atoms are positively charged balls filled with negative electrons
(JJ Thompson)

Question 4

rows in periodic table are

Answer 4

periods
amount of shells

Question 5

columns in periodic table

Answer 5

group
amount of valence electrons

Question 6

why does temperature stay same when state of matter changes

Answer 6

the energy is spent on overcoming intermolecular forces of attraction not heat

Question 7

Distillation

Answer 7

Separating liquids via different boiling points

Question 8

What is Chromatography

Answer 8

Used to separate different substances dissolved in a liquid.
Each substance moves up the paper at different rated

Question 9

How to treat water

Answer 9

Remove small insoluble particles with sand and gravel beds
Add chlorine to kill microorganisms