Intermolecular Forces Supplement on Crystalline and Amorphous Solids

Intermolecular Forces – Supplement on Crystalline and Amorphous solids

Pre-class Assignment: Read the following definitions and answer the questions below.

Crystalline solid: A solid in which particles are arranged in lattices, regular arrangements of row and columns (not always rectangular), like a stack of billiard balls. Crystalline solids have definite and specific melting points. Examples of crystalline solids include: snowflakes, dry ice, table salt, sugar, and quartz.

Amorphous solid: A solid in which particles are arranged in randomly, like a pile of spaghetti (not a lattice structure). Amorphous solids soften then liquefy over a wide temperature range. Examples of amorphous solids include: butter, road tar, and glass.

1 - How would you classify candle wax? Why? ______

______

2 - Interpreting graphs (fill in the blanks):

Based on the graphs below, sample G is a(n) ______solid, and

sample H is a(n) ______solid.

The temperature and phases of two samples as heat is added

Sample G Sample H

liquid liquid

Temp. Temp.

solid solid

Heat Added Heat Added