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Observations of Physical and Chemical Changes

In: Science

Submitted By emilyfromme85
Words 1219
Pages 5
Observations of Chemical Change and Physical Change
Emily Fromme
July 7, 2015

Purpose: To perform a variety of chemical reactions and make scientific observations to describe the chemical change.
Equipment: Pie pan, dish soap, distilled water, matches or lighter, pair of sunglasses, paper towel, scissors, sheet of black paper, sheet of white paper, source of tap water, sunlight (needed for 30 minutes); burner fuel, 2 pairs of gloves, pipet, empty short-stem pipet, goggles, spatula (metal), test tube clamp holder, 4 test tubes, test tube rack, tweezers, 2 well-plates, 1 Experiment Bag: Observations of Chemical and Physical Changes.
Exercise 1 Procedure:
First, set a sheet of black paper and a sheet of white paper on a table. Set one of the 24-well plates on the table and use scissors to carefully snip off the tips of pipets containing chemicals. Set upright in wells using well plate as a pipet holder. Set the second well-plate on sheet of white paper and arrange so that A1-well is in upper left-hand corner.
In well 1, place 4 drops of sodium bicarbonate (NaHCO3) and then add 4 drops of hydrochloric acid (HCl) to sodium bicarbonate. Swirl well-plate as necessary to thoroughly mix two chemicals together. Immediately observe the interaction between chemicals (using white and black sheets of paper as background) and record observations in Data Table 1.
From observations, make a conclusion (yes or no) if a chemical change occurred and record in Data Table 1.
Repeat steps 4-7 for the remaining 11 reactions in Data Table 1.
When all reactions have been executed and all observations have made, determine if they, the chemicals, if a chemical change has or has not occurred. Record your conclusions in Data Table 1.
Use paper towels to carefully blot up any chemicals that remain in well plates or pour the chemical mix down sink and flush with a lot of water.

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