Title and Identifiers: Observations of Chemical Changes by the use of acids and bases. Abstract: To observe the small changes that occur in chemical reactions and attempt to interpret the changes of the atoms and molecules that allow for these small changes to happen; and to associate these chemical properties with household products. We will also learn how to separate mixtures. Experiment Procedures: 24-well plate is used as a convenient holder for the pipets of chemicals. 96-well plate is used for mixing the chemicals.
With iodine it changes to a brown color and becomes clumpy. Using the mystery powder key, experimental results were compared to know results of baking soda,baking powder,cornstarch and powdered sugar. Chemical changes were made when a substance fizzes up or changes color. When a substance fizzed up into bubbles, it indicated a reactivity of solubility and a chemical change. Physical changes were indicated when a substance only reacted once.
Based on this result, what biological molecules are present in the chocolate chip cookie solution? What is the relationship between monosaccharides and starches? Experiment 3: Lipid Test Fill in the table below with the results from the lipids test experiment. Results Lipids Test Solution Initial Color Color with Sudan Solution corn Oil water What results would you expect from a sudan test of chicken soup? What is the size difference between fat polymers and starch and protein polymers?
General Chemistry I51 Extraction of pigments Author: Hengye Zuo Lab Partners: Meshach, Todd, Asiac Instructor: Lindsey Date lab performed: 03/20/2012 Date report due: 03/27/2012 Abstract The molar absorptive (E) of red food dye 40# (Allura red dye 40#) at 520 nm was determined to be 2.7*10^5M. The determination will be accomplished using a beer’s law analysis. A series of five standards prepared from a stock solution using parallel dilution. The absorbencies of the standards were measured and plotted. As we know the equation C1V1=C2V2, we can get a set of concentration (g/L) of different ratio of Red #40.
1) Brine is salt water composed of potassium chloride, sodium chloride, lithium chloride, and calcium chloride. Contaminates such as KCl, LiCl, and CaCl2 may be present in the left over after the baking soda product goes through the process of filtration. In order to analyze their products for purity, value of craftsmanship, fundamental flaws, arrangement, and endurance, most manufacturing companies employ quality control scientists and technicians. Quality control resides in periodic examinations made to uphold quality during the manufacturing process. The Athenium Baking Soda Company is looking to employ a team of four quality control scientists to examine and determine their baking soda for pureness and quality.
|Cloudy mixture |Bubbled/ fizz had |Red- green |Gas noted |Turned blue became | | | | | |darker on bottom |leftover Mg in |center |Fizzled |clear liquid. | | | | | |Powder settled. |tube? |Changed blue |Cloudy Green | | | | | | | | | |Substance | | | | | | | | |Blue green | |
Methods My group used the method of titration to test whether the Vitamin C and lime juice nutritional facts where correct from their manufacture. First, we started with the standardized solutions, NaOh and HCl, to get familiar with how titrations work and start the titration of potassium hydrogen phthalate (KHP). We begun by gathering up all the necessary materials needed for the titration including: the general laboratory glassware from the bins, standard safety equipment, 50mL burette, phenolphthalein, NaOh (3 mol/L), HCl (3mol/L), KHP, ascorbic acid, and lime juice. The standardization of NaOh came first, which started by gathering the KHP and putting 1.5 g into 3 flasks with 50 mL of water in each. After we added the KHP to the 50 mL of water, we placed each one of the flasks onto a stir plate with a magnet in each flask so we achieved maximum stirring.
Purpose The Purpose of this lab is to observe and discover how different chemicals and substances react with each other and how their physical and chemical properties change. Procedure Before beginning the experiment, I reviewed the instructions and the goals of the experiment and re -reviewed the safety procedures when conducting lab experiments After I prepared myself with the requirements, I laid out each item that was needed to perform the experiment- test tubes, bunsen burner, 100-Ml Glass Beaker, Stirring Rod, test tube clamp holder, cleaning brushes, 24 well plate, 96/well plate, blue litmus paper, red litmus paper, Copper (II) Carbonate, Copper (II) Nitrate Crystals, Copper Metal, Magnesium, Magnesium Oxide Powder, Sodium
Matter and Chemical Reactions Pre-Lab Preparation: Purpose: The reason we are doing this lab is because we are trying to see what will happen. When you put copper and silver nitrate together. Also after that I will see if any elements reacted and if so which ones and what is the name of the compound they formed. Hypothesis: If I put the copper into the silver nitrate, then it will make some type of solid. Materials: copper wire AgNO3 solution Sandpaper Stirring Rod 50-mL Graduated Cylinder 50-mL Beaker Funnel Filter Paper 250-mL Erlenmeyer Flask Ring Stand Small Iron Ring Plastic Petri Dish Paper Clip Bunsen Burner Tongs Pre-Lab Questions: 1.)
You know what color phenolphthalein and bromothymol blue turn when testing an acid or a base. Use the empty pipet in the Auxiliary Supplies Bag to test several (at least 3) household items including household cleaning products with bromothymol blue. Rinse the pipet well before using it on the next household chemical. When finished with this experiment rinse the pipet well and return it to the Auxiliary Bag for use in future experiments. Name the items tested and record their results.