chem bonding

Question 1

describe lattice structure of graphite [2]

Answer 1

1. has giant covalent structure
2. extensive network of covalent bonds btw (C) atoms in a layer and weak idid interactions
   between the layers

Question 2

Explain the increase in ionic radius of the Group 1 cations down the group. [2]

Answer 2

1. nuclear charge increases down the group as the number of protons increases
2. however, number of inner shells increases
3. valence electrons are further away from the nucleus
4. experience stronger shielding effect

Question 3

explain why (__) is soluble in dilute HCl [2]

Answer 3

1. (__) react with dilute HCl to form ionic salt
2. form ion-dipole attractions between ions and water
3. release sufficient energy to overcome EFA btw ions & intermolecular H bonds btw H2O molecule