Models Of Structures Flashcards
1
Q
what are the three main models used to visualise the structures of ionic substances
A
- 2D representations
- dot and cross diagrams
- 3D models
2
Q
what is an advantage of 2D representations
A
- 2D representation of the molecules are simple
- and great at showing what atoms something contains
- and how the atoms are connected
3
Q
what is a disadvantage of 2D representations
A
- they dont show the shape of the substance
- they dont give you any idea about the sizes of the atoms
4
Q
what is an advantage of the dot and cross diagrams
A
- they are useful for showing how compounds or molecules are formed
- and where the electrons in the bonds or ions came from
5
Q
what is a disadvantage of the dot and cross diagram
A
- they dont usually show you anything about the size of the atoms or ions
- or how theyre formed
6
Q
what do 3D models of ionic substances show
A
the arrangement of ions, but only the outer layer of the substance
7
Q
what do the ball and stick models show
A
how the atoms in a substance are connected
8
Q
what are the advantages of the ball and stick model
A
- theyre great for visualising structures as they show the shape of the lattice or molecule in 3D
- theyre more realistic than 2D drawings
9
Q
what are the disadvantages of the ball and stick model
A
- they are a bit misleading as they make it look like there are gaps between the atoms (its where the electron clouds interact)
- they dont show the correct scales of the atoms or ions
