Labpaq Scientific Method

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The Scientific Method
Portland Community College Staff* Version 42-0207-00-01

Lab RepoRt assistant

This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.

obseRvations

Data Table 1: Making Observations | Procedure | Observation | a) Torn paper | Vertical tear: relatively even tear, frayed edges, very thin strands sticking outHorizontal Tear: rigid edges->less even, frayed edges, thin strands | b) Appearance of rock saltcrystals | Before crushing: hard, sharp edges, all different shapes, abt .25 inch, cloudy color.After crushing: breaks into different sized shards, some smaller crystals, Wet: Salt mostly dissolves although layer of tiny granules is visible at bottom of water bubble. | c) Appearance of sand | Dry: multicolored, different shapes and sizes, generallty smaller than the salt crystals, very hard, not as sharp as salt crystals. Feels course. Some grains look more uniform to each other than others do.Wet: did not dissolve. Seemingly unchanged. | d) Oil and water on plastic | Oil: expands evenly into almost perfect circle, takes longer to reach max expansion, covers more surface area, lays flatter on surfaceWater: did not form even circle, reached max expansion very quickly, formed more of a bubble on surfaceBOTH: Clear and shiny | e) Making iodine in water: potassium iodide (KI), and sodium hypochlorite (bleach, NaClO). | KI- ClearNaOCl- ClearWhen combined they solution immediately turned a bright yellow. |

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