Mix pairs of solutions in the following ways, and record all of your observations in the data table. System 5: FeCL3 + KSCN System 6: Fe CL3 + AgNO3 System 7: FeCL3 + K4Fe(CN)6 Part B: Reactions of Acids To four of your calibrated test tubes, add 3-ml of hydrochloric acid, and to four different test tubes add 3-ml of HNO3.…Test the reaction of the acids to litmus paper by dipping a glass rod into the test tube containing the acid you are testing and touching it gently to both the blue and red litmus paper. Record observations in the data table. Make sure you rinse off the
The Ghosts of Evolution: Nonsensical Fruit, Missing Partners, and Other Ecological Anachronisms. New York: Basic Books, 2002. Brown, Allan. “The Uncommon Bodark.” Arkansas Times, May 1986, pp. 50–55.
Experiment 11 Lab Assignment Answer Sheet: Chromatography of Food Dyes Name: Pre-Lab: Define the Rf value of a compound The "rf" value is the distance the compound moves relative to the distance the solvent moves. Data and Observations: Record the distance travelled by the sample and the solvent in the table below and calculate the Rf values. Table 1. Color Distance(m Blue1 Blue2 Red3 Red40 Yellow5 Yellow6 33 3 10 22 42 30 .55 .05 .17 .37 .70 .50 m) Rf Solvent 60 Table 2. Kool-Aid®: Grape Kool-Aid®: Strawberry Distance (mm) Red: 5 10 Distance (mm) Blue:17 n/a Rf .08 and .28 .17 Substance Solvent 60 Table 3.
Experiment 11 Lab Assignment Answer Sheet: Chromatography of Food Dyes Name: Pre-Lab: Define the Rf value of a compound: It is the distance traveled by the compound divided by the distance traveled by the solvent front. Data and Observations: Record the distance travelled by the sample and the solvent in the table below and calculate the Rf values. Table 1. Color|Blue1|Blue2|Red3|Red40|Yellow5|Yellow6|Solvent| Distance(mm)|50mm|0mm|10mm|21mm|28mm|23mm|50mm| Rf|1|0|0.2|0.42|0.56|0.46|1| Table 2. Substance|Kool-Aid®: Grape|Kool-Aid®: Strawberry|Solvent| Distance (mm)| 19mm(red)|28mm(red)|48mm| Distance (mm)| 47mm(blue)||48mm| Rf|0.39 & 0.98|0.58|1| Table 3.
It also involves the changing of elements into a compound. Aim: To perform a synthesis of common elements to make it into its compound state and analyse the results obtained from the processes to understand and compare the properties of the before and after state Equipment: Crucible and lid Tripod Bunsen burner Tongs Clay triangle Magnesium wire (10cm) Measuring scales Method: 1) Weight the empty crucible with its lid on the measuring scales. Make sure the crucible is dry by wiping it with paper towels as moist applies weight and make the results inaccurate. 2) Coil the magnesium wire around a pencil and remove it to make a magnesium ribbon and weight it. 3) Set up Bunsen burner and tripod while placing the clay triangle on top the tripod, align with the triangle shape.
“Development of agriculture in Ethiopia since the 1975 land reform” . http://www.sciencedirect.com/science/article/pii/016951509190022D New Agriculturalists: Profile Cameroon/Ethiopia (july 2001). http://www.new-ag.info/en/country/profile.php?a=871 Suchita Vemuri ( February 2005). Nation Master . Agriculture in Cameroon and Ethiopia.
DETERMINATION OF DYE CONCENTRATION BY SPECTROPHOTOMETRY Abstract The purpose of this lab is to determine the molar concentration of a food dye in an unknown solution. To determine the concentration of a food dye, UV light with different wavelength is passed through erythrosin B using spectrophotometer to find the wavelength that yields the highest absorbance. The wavelength with highest absorbance is passed through different concentration of erythrosin B solution and recorded the absorbance. The concentration of the solution is calculated by using Beer’s Law. First using the various dilutions of the solution and their absorbance, graph is plotted to determine the slope.
Purpose: To determine and execute the separation of mixture of solids through different means. Examples are magnetisms, evaporation, and filtration. Proposed procedure: Start with the mixture, remove iron by using the magnet, then you are left with NaCl, Benzoic acid and sand. Add water to the mixture, and heat it up and pour the liquid from the sand by filtering it out, lay the sand out to dry, funnel out the benzoic acid and the final liquid will contain NaCl and I would heat it to have the water evaporate. Procedure: Followed the steps in the lab manual to conduct each separation.
96-well plate is used for mixing the chemicals. For each combination, a different well is used. For each combination, 2 drops of the 1st chemical are placed in the well followed by 2 drops of the 2nd chemical. After placing 2 drops of the 2nd chemical, observation is immediately made for any change of color, forming of precipitates or bubles. Also white & dark backgrounds are alternatively placed underneath the well plate for observing the mixture.
Then measure the distance of each pigment starting at the bottom of the pigment origin to the bottom of the separated pigment band. In Exercise 4B: Photosynthesis/ The Light Reaction, chloroplasts are extracted from spinach leaves and incubated with DPIP in the presence of light. The spectrophotometer should be warmed up and set the wavelength to 605 nm. An incubation area should be set up, that includes a light, water flask, and test tube rack. We were provided with two beakers, one containing a solution of boiled chloroplasts and