Question

Prolaboratory Exer Physical Properties of Substances Data Sheet: Physica Part IV-Observations of Physical Changes and Crystal Structures Characterize and sketch crystals of the various crystals you have prepared. Use colored pencils TABLE 4.8 Sulfur Amorphous sulfur in w (Look up this term.) Sulfur crystals formed Powdered sulfur from in filter cone reagent bottle Sketch Characterize TABLE 4.9 lodine Crystals from reagent bottle Crystals from watch glass Sketch Characterize 18. What supporting evidence of Dalton's atomic theory does the formation and growth of crystals suggest? (Base your answer on the observation you noted in "Part IV-Observation of Physical Changes and Crystal Structures" of the report.) Chemistry 120

Answer 1

Sulfur crystals formed in Amorphous sulfur in Powdered sulfur from SULFUR filter conc reagent bottle water Sketch Powder, pale yellow in Characterize Crystalline, bright yellow in Plastic, resinous appearance, dark yellow-brown in colour colour colour (Meaning of the term-amorphous: without a clearly defined shape or form; shapeless)

Crystals from reagent Crystals from watch glass IODINE bottle Sketch 250g Purity: 99.8% AR grade lodin Characterize globular, blackish in Crystalline, bright in colour colour

According to Dalton’s atomic theory,

• All matter is composed of extremely small particles called atoms.
• Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties.

-- these two parts of Dalton’s atomic theory finds supporting evidence in formation and growth of crystals.