1 The table gives the melting points, the boiling points and the electrical properties of six
substances A to F.
EO:
substance
melting point boiling point
1°C
1°C
A
-210
-196
B
777
1627
С
962
2212
electrical conductivity electrical conductivity
as a solid
as a liquid
does not conduct does not conduct
does not conduct good conductor
good conductor good conductor
does not conduct does not conduct
does not conduct does not conduct
good conductor good conductor
D
-94
63
E
1410
2355
F
1064
2807
(a) Which two substances could be metals?
(b) Which substance could be nitrogen?
[1]
(c) Which substance is an ionic solid?
[1]
(d) Which substance is a liquid at room temperature?
(1)
(e) Which substance has a giant covalent structure similar to that of diamond? [1]
(0) Which two substances could exist as simple covalent molecules?
[1]
[Total: 6]​

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic