diagrams

Question 1

2 advantages/3 disadvantages dot and cross in ions

Answer 1

advantages: shows electron arrangement, shows the charge on the ion
disadvantages: electrons aren’t really dots and crosses, electrons aren’t in pairs, doesn’t show how ions are arranged in space

Question 2

3 advantages/2 disadvantages ball and stick

Answer 2

advantage: shows the 3D structure/arrangement, helps to visualise it, suggests compound extends beyond what’s shown
disadvantages: doesn’t show real spacing of electrons-aren’t that far apart, no forces between ions shown

Question 3

2 advantages/2 disadvantages tightly packed

Answer 3

advantages: shows how closely packed ions are, shows ionic bonds
disadvantages: electrons aren’t flat circles, really a continuous structure not limited

Question 4

2 advantages/2 disadvantages 2D

Answer 4

advantages: easy to draw, shows the different elements in the ion
disadvantage: doesn’t show charges, doesn’t show other layers

Question 5

draw a simple model of NaCl lattice

Answer 5

answer in textbook pg 50

Question 6

displayed formula pros and cons covalent

Answer 6

pros-good way of showing how atoms are connected in large molecules, easy to understand
cons-doesn’t show 3D structure, doesn’t show which atoms the electrons come from, doesn’t show bond angles

Question 7

3D model pros and cons covalent

Answer 7

pros-shows the atoms, covalent bonds and their arrangement
cons-can get confusing for large molecules
don’t show where electrons come from

Question 8

covalent dot/cross pros and cons

Answer 8

pros-show which atoms the electrons come from
cons-don’t show relative sizes
don’t show how atoms are arranged in space

Question 9

ball and stick covalent pros/cons

Answer 9

pros-similar structure, shows 3D structure
cons-atoms aren’t labelled, no covalent bonds, no electrons