Record your hypothesis on page 123. -My hypothesis is we can determine the different between each chemical reaction by the temperature change.To descide which one is exothermic and endothermic. 4. Summarize the procedures you will follow to test your hypothesis. -We measured in each chemical and added water besides, HCl we added NaOH.
Lipids- The materials used in this section were Water, piece of brown paper bag, and vegetable oil. Procedures- Protein-In this experiment we are testing for protein in each solution. We pour drops of biuret reagent into the different contents. If the liquid turns purple, then protein is active. Carbohydrates- In this experiment We test for starch.
| Summary: Alcohols________________ | Water (highly Polar)_____ | Hexane (Non-Polar)______ | 1-OctanolCH3(CH2)6CH20H | Insoluble | Soluble | 1-ButanolCH3CH2CH2CH2OH | Partially soluble | Soluble | Methyl AlcoholCH3OH | Soluble | Insoluble | Part C: Miscible or Immiscible Pairs: In the experiment Part C we will obtain five test tubes total, four filled with water and the last test tube with Hexane. With the five test tubes we will be mixing other liquids in each individual test tube to see if the solution is miscible or immiscible. Note to take, like mixes with like. Procedure | Observation | TT1: 1ml water + 1ml Ethyl Alcohol | Miscible | TT2: 1ml water + 1ml Diethyl Ether | Immiscible | TT3: 1ml water + 1ml Methylene Chloride | Immiscible | TT4: 1ml water + 1ml Hexane | Immiscible | TT4: 1ml Hexane + 1ml Methylene Chloride | Miscible | Part D: Solubility of Organic Acids and
Lastly add 1 mL of water using the buret for water to the last beaker, and label this beaker “Green”. Clean and dry 4 cuvettes. The next part of the experiment is to actually use the spectrophotometer to find the absorbance of the green, yellow, and blue tubes. First, make sure the spectrophotometer is connected to the computer. The first step is to calibrate the blank or the background, and to do this, a cuvette of distilled water is inserted into the spectrophotometer.
2. Record initial pH using the pH paper. Use forceps to dip the small strip into the water and compare the color change to the standard color chart. 3. Add 0.1M HCl one drop at a time.
The first part involved testing the indicator. This was done by preparing a buffer solution, dipping a few grains of EBT powder into the solution, and checking to ensure that the resulting solution turned a bright, clear blue. The second part involved actually performing the titration. In this step, I simply constructed a mechanism that would hold the titrator and I dripped a few drops of EDTA solution from the titrator into the beaker. Finally, the last step involved titrating the water.
Purpose: Learning the ability to tell the difference between (+)- and (-)-Carvones in multiple lab procedures. Also, the ability to read what substance “Caraway Oil or (+)-Carvones” is in limonene and spearmint. Procedure & Results: Part A: Analysis of the Carvones There are four different lab procedures in part A. In the first part of this lab, you will carefully smell the containers of spearmint, caraway oil, (+)-carvone, and (-)-carvone. Once you smell each substance, you will record what each substance smells like.
BACKGROUND: For these experiments a 96-well plate was used. Each chemical listed would be put into their own well of 2 drops of each chemical unless instructed otherwise. After the chemicals were each dropped into the wells they were stirred with a different toothpick each time (to not cause cross contamination) and then was observed over a white piece of paper and then a black piece of paper. For each reaction I recorded the well number and took detailed notes on the reactions observed. After the first two tests done with BTB I hypothesized that acids would turn BTB yellow and that bases would remain blue.
Using the 96 well plate I combined various chemicals together to observe the chemical changes that were created. After this step was completed I combined three different household cleaners with bromthymol blue to observe whether the cleaner was an acid or base. After a thorough cleanup of the chemicals and workspace I answered the appropriate questions related to this lab
CHEMICAL AND PHYSICAL CHANGES Purpose: • To observe and develop guidelines to recognize and identify chemical and physical changes. • To make and record accurate observations before, during, and after a chemical or physical change. Procedure: • Perform each of the following experiments AND follow the directions carefully. • Wear your safety glasses and aprons for the entire experiment. • For each change, carefully observe and record the following observations in an observation table o on the original substance(s) before the change.