scientific method

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LAB 1 – THE SCIENTIFIC METHOD

*Adapted from LabPaq CK-GCC

Purpose: The purpose of this experiment is to learn about and use the Scientific Method. The discussion of physical properties such as density, color, texture, smell, and solubility will take place.

Observations and Experimental Data:

Table 1: Making Observations

Procedure
Observation
A. Torn paper
Vertical tear: easier to tear, more visible fibers, more jagged edges and uneven tear.
Horizontal tear: harder to tear, less fibers visible, less jagged edges and more of a straight line tear.

B. Appearance of rock salt crystals
Before crushing: Jagged edges, very few smooth surfaces, size was 9mm x 6mm, cubic crystal shape with ridge like features. Color was opaque, borderline grey with milky white indentations.

After crushing: Some pieces appeared transparent, shinny and became individual crystals.

Wet: The drops on the crystals formed a dome. No movement of H2O. After a few minutes smaller crystal were absorbed by H2O with some bubbles at bottom while larger crystals were slowly beginning to break down.

C. Appearance of sand
Dry: Size was 1mm-1.5mm, pink, grey, brown, and opaque in color. Semi circulating ovals, jagged edges with hard and uneven surfaces. Appeared to be sharp and most of granules were different in origin.

Wet: H2O encapsulated sand, most diverted to out edges forming a ring effect and none were dissolved.

D. Oil and water on plastic
Oil: Spread when on surface, flat appearance with a semi circular shape with irregular edges. Size was 7mm x 8mm with translucent color and was fewer luster.

Water: Bubble effect , remained stationary. Size was 4mm x 4mm, translucent and more luster than the oil.

E. Making iodine in water: potassium iodide (KI), and sodium hypochlorite (bleach, NaClO).

F. Making iodine in oil: mineral oil, water, potassium iodide, and sodium hypochlorite Initially: H2O in center of oil,

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