Observations of Chemical Changes
Experiment 1: Observations of Chemical Changes
Abstract: In the lab 1 experiment, the objective was to observed properties of various chemical reactions between twelve different basic compounds. Each reaction revealed chemical properties consisting of color change, CO2 gas formation, and/or precipitate formation. Certain reactions made it possible to distinguish between an acid and a base. Through the results of this experiment, chemical properties observed in the reactions could be used to associate similar chemical substances and properties in household products.
Experiment and Observations: The first step in this experiment was to sequentially pair basic compounds together and observe the chemical changes produced. Twelve compounds were paired together to produce eleven different results, successively labeled parts “A” through “L” (to exclude part F).
The experiment was conducted by placing two drops of a substance in one well of the well-plate-96 followed by two equal sized drops of a second substance to produce an observable reaction (or lack thereof). Exceptions included part C where one drop of BTB (bromthymol blue) was used and part E where an additional drop of HCI (hydrochloric acid) was added to blue dye and NaOCI (sodium hypochlorite). In part K, the AgNO3 (silver nitrate) and NaOH (sodium hydroxide) mixture was saturated into a paper towel and exposed to a bright light. The resulting mixtures were then observed against two different backgrounds, one white and one black, by slipping a white piece of paper underneath the mixture and then doing the same with a black piece of paper. Observations were made for both backgrounds and recorded on a data table. In general, light colors and precipitates were easier to see against the dark background, and darker colors were easier to see against the white background.
Data Table 1: Observations of Chemical Reactions Chemicals | Well# | Reaction on White Paper | Reaction on Black Paper | NaHCO3 + HCI
Abstract: In the lab 1 experiment, the objective was to observed properties of various chemical reactions between twelve different basic compounds. Each reaction revealed chemical properties consisting of color change, CO2 gas formation, and/or precipitate formation. Certain reactions made it possible to distinguish between an acid and a base. Through the results of this experiment, chemical properties observed in the reactions could be used to associate similar chemical substances and properties in household products.
Experiment and Observations: The first step in this experiment was to sequentially pair basic compounds together and observe the chemical changes produced. Twelve compounds were paired together to produce eleven different results, successively labeled parts “A” through “L” (to exclude part F).
The experiment was conducted by placing two drops of a substance in one well of the well-plate-96 followed by two equal sized drops of a second substance to produce an observable reaction (or lack thereof). Exceptions included part C where one drop of BTB (bromthymol blue) was used and part E where an additional drop of HCI (hydrochloric acid) was added to blue dye and NaOCI (sodium hypochlorite). In part K, the AgNO3 (silver nitrate) and NaOH (sodium hydroxide) mixture was saturated into a paper towel and exposed to a bright light. The resulting mixtures were then observed against two different backgrounds, one white and one black, by slipping a white piece of paper underneath the mixture and then doing the same with a black piece of paper. Observations were made for both backgrounds and recorded on a data table. In general, light colors and precipitates were easier to see against the dark background, and darker colors were easier to see against the white background.
Data Table 1: Observations of Chemical Reactions Chemicals | Well# | Reaction on White Paper | Reaction on Black Paper | NaHCO3 + HCI