Essay About Mineral Oil And Appearance Of Rock Salt Crystals

Death Rate
Purpose of Lab: learn how to use the Scientific Method
to hypothesize about and determine the identity of unknown
substances
Experimental Data:
Table 1: Making Observations
Procedure
Observation
torn paper
Vertical tear: almost straight, fiber is barely seen
Horizontal Tear: zigzag, fiber appeared
2. Appearance of rock salt crystals
Before crushing: colorless, semitransparency, chunky, a rough feeling, jagged
After crushing: cubic crystal, colorless, transparent
Wet: tiny sphere (particulates) like air bubbles
3 Appearance of sand
Dry: colorless (tiniest), light pink, white, gray with black dot (biggest)
Wet: The material remains unchanged
4. oil and water on plastic
Oil: When dropped, widely spread, flat from side view, clear, not reflect lights,
Water: When dropped, didn’t spread, oval from side view, clear, reflects lights
5. Making iodine in water: potassium iodide (KI), and sodium hypochlorite (bleach, NaClO).
Both are clear before mixed together, but after mixed, it becomes yellowish brown.
6. Making iodine in oil: mineral oil, water, potassium iodide, and sodium hypochlorite. (iodine)
Initially: looks like a sunny-side up. Oil (outside) and water (middle) are clear, iodine (inside) is yellowish brown
After 30 min.: oil is light purple, iodine is light yellowish brown
Drawing of what you see for step 6:
Please indicate the following on your drawing:
where you think the water is,
where you think the oil is,