chapt 4&5 (ionic covalent bond)

Question 1

ionic compounds (4)

Answer 1

-> gaining/ losing electrons of metals and non metals
-> solid state at room temp. , form giant crystal lattice structure. Strong electrostatic forces of attraction (need large amt of energy to overcome). = high m.p & b.p
-> soluble in water (aqueous state) , insoluble in organic solvents.
-> not able to conduct elect. in solid state as ions in lattice are only able to vibrate abt fixed posi. , while in molten state, ions are mobile and can conduct elect.

Question 2

covalent compounds (5)

Answer 2

-> form by sharing electrons with 2 or more non metals to gain noble gas configuration.
-> gas or liquid at room temp. weak intermolecular forces of attraction but strong covalent bonds, small amt of energy needed to overcome. = low m.p & b.p
-> as molecule bcm larger, m&b.p inc.
-> insoluble in water, soluble in organic solvents.
-> DO NOT CONDUCT ELECT. AT S,L AND G STATE. ( they do not form ions and their electrons are shared)

Question 3

Metallic (4)

Answer 3

-> high m & b.p
-> good conductors of heat
-> pure metals are malleable and ductile ( pure metal are layered, when force applied, atoms can slide over one another.
-> have valence electrons that are free to move arnd the structure. = good conductor of elect.