Essay About Chemical Changelab Report And Blue C

Observation of Chemical Change
Observation of Chemical Change
Observation of Chemical ChangeLab Report 1[pic 1]SECTION 1: Chemical ChangeAbstractThe objective of the experiment was to determine a substance is transformed into a chemically different substance. When hydrogen burns in air for example it undergoes a chemical change because it combines with oxygen to form water. In physical change a substance changes it physical appearance but not it composition. Chemical changes are determined by how a substance reacts with one or more substances when forming compounds. These reactions are known as chemical reactions.  Not all chemicals will react when mixed with another chemical; while some chemicals can be explosive or toxic when mixed with other chemicals.ExperimentThe experiment was determining the chemical change.1. To observe some properties of chemical reactions 2. to associate chemical properties with household productsChemical changes are often accompanied by physical changes. Three that you should not see in this lab are changes in temperature, presence of a flame, and evolution of light, as when as firefly glows. Three physical changes that indicate a chemical change may have occurred (and that may be seen in this lab) are: 1. Color changes2. Precipitate (formation of a solid)3. Formation of gas bubbleNo preliminary dilution of my test chemicals were necessary as Lab Paq provided pre-diluted chemicals. Utilizing the 96-well plate, 2 pipet drops of each chemical were added to the wells in the following combinations: a) NaHCO3+HCl b) HCl+Bromthymol blue c) NH3+1 drop Bromthymol blue d) HCl+blue dye e) Blue dye+NaOCl followed by HCl f) NaOCl+KI followed by various test foods g) KI+Pb(NO3)2 h) NaOH+phenolphthalein i) HCl + phenolphthalein j) NaOH+AgNO3 k) AgNO3+NH3 l) NH3+CuSO4. Along the way, observations were made pertaining to the reactions witnessed. This experiment concluded with testing household chemicals and proper disposal of lab chemicals Data Tables and Observations:TimesChemicalsReaction8am until 12pmNaHCO3 and HCI-CO2 Bubbles did not fizz and continued to occur until all of the liquid from the well was gone. Homogeneous. Bleach-like smell Clear bubbles; bubbles did not fizz and continued to occur until all of the liquid from the well was gone. Homogenous. Bleach-like smell.12pm till 4pmHCI and BTBGolden Yellow Clear Liquid Amber Clear Liquid and Turned orange, homogenous Turned into an amber color, homogenous4pm till 8pmNH3 AND BTBRoyal Blue Clear Liquid Dark Blue Opaque Liquid and Turned dark blue, but did not leave a stain on the toothpick; homogenous Still resembled a dark blue, NOT black; did not leave stain on toothpick; homogenous8pm till 12amHCI AND BLUE DYEEmerald Green Clear Liquid Dark Green Opaque Liquid and Turned dark blue, stained toothpick with dark blue color; homogenous Seemed to be entirely black; homogenous7am till 11amBlue dye and NaOCLObserve, then add 1drop of HCl. Turned dark blue, but with time it turned into an aqua blue; stained toothpick with aqua blue; homogenous Looked nearly black at first, but as it grew lighter, it looked more grey; homogenous11am till 3pmKI and Pb(NO3)2Bold yellow, seems solid and cloudy; with time created white/yellowish solids at the bottom of the well; precipitated Bold yellow, seems solid and cloudy; with time created white/yellowish solids at the bottom of the well; precipitated3pm till 7pmNaOH and phenolphthaleinhomogenous Still resembled a dark fuchsia; homogenous730pm till 1145pmHCI and phenolphthaleinCLEAR; no bubbles; homogenous CLEAR; no bubbles; homogenous8am and 12pmNaOH and AgNO3Bold brown, chocolate milk color(?), seems solid and cloudy; with time create white/brownish solids at bottom of the well; precipitated Bold brown, chocolate milk color(?), seems solid and cloudy; with time create white/brownish solids at bottom of the well1230pm till 415pmAgNO3 and NH3Clear seems to be some small bubbles/solids at the bottom435pm till 840pmNH3 and CuSO4Cloudy aqua blue, seems solid and cloudy; with time created white/blue-is solids at bottom of the well; precipitated Cloudy aqua blue, seems solid and cloudy; with time created white/blue-is solids at bottom of the well;