Question

Classify the following into crystalline and amorphous solids. [NaCl, Graphite, Plastic, Diamond, Rubber, KCl, Wood, Iodine ]

Answer 1

Answer:

1)crystalline: NaCl, graphite, diamond, KCl, iodine.

2)amorphous: plastic, rubber, wood.

Explanation:

• crystalline solids  are the solids in which the constituent particles(atoms, ions,or molecules) are arranged in a regular, three dimensional orderly arrangement, which gets repeated throughout.
• some characteristics of crystalline solids are:

1. long range order solid.(regular dimension)
2. sharp melting point
3. they are anisotropic (they have different values when measured from different directions,in same crystal.
4. sharp and smooth edges.
5. characteristic enthalpy of fusion.

• amorphous solids are solids in which constituent particles are randomly scattered with no regular arrangement of particles.
• some characteristic of amorphous solid are:

1. they do not have definite shape
2. short range order solids
3. diffused melting point
4. isotropic nature( have same value in all direction)
5. diffused and irregular edges.
6. they are known as pseudo solids or supper cooled liquids as they have tendency to flow.