What are the differences between molecular and ionic crystals? give an example of each.

Explanation:

Ionic crystals

1. They are formed by electrostatic attraction between the cation and anion.

2. Naturally solid and brittle in nature.

3.Generally good conductors of electricity in moltane state and  have high melting and boiling points.

Example: NH4Cl is an inonic compound with NH4^+ being cation and Cl- being anion.

Molecular Solid

1. These are formed by sharing of electrons pair between the atoms. A shared pair of e- is  called a covalent bond.

2. Usually not a good conductor of electricity even in melted state.

3. They mostly liquids and gases only a few are solids.

examples , CO, CO2 , H2CO3 , etc.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )