Liquid CO2 Extraction of D-Limonene This convenient‚ effective and inexpensive liquid CO2-based extraction of a natural product (D-limonene) provides an engaging example of natural products extraction using an alternative solvent (liquefied CO2). Because the procedure can be carried out in a polypropylene centrifuge tube and uses crushed dry ice as its CO2 source‚ it provides an inexpensive alternative to the equipment-intensive extraction with supercritical CO2. A short video clip is available
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completely original; the basic concept has been used multiple times. It uses Beer’s Law: · A is light absorbance · is “molar absorptivity with units of L mol-1 cm-1” · l is the length of the cuvette in centimeters · c is the concentration of the solution in mol L-1 The relationship between absorbance and concentration
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Objective/Question/Problem The objective of this project is to see if an egg will float in salt water. The question is how much salt is needed to be added to the water to make the egg float. The problem is that no one knows how much salt is needed to make an egg float. Hypothesis It will take at least three teaspoons of salt to be added to the water for the egg to float. The reason why I think three teaspoons of salt will need to be added to water for the egg to float is because the egg a density
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area to volume ratio causing them to act more efficiently than the bigger cells. The smallest cell had a ratio of 1:12 while the biggest cell had a ratio of 1:2‚ leaving a gap of 5:12 causing the bigger cell to act less efficient in absorbing the solution in a period of 10 minutes. Also‚ as the size of the cube increased‚ the surface area increased more quickly than the volume such as the difference between the volume of the biggest (3cm) cube and the smallest cube (0.5cm) was only 26.9 ㎤
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Introduction Recrystallization is a method used to purify solid organic compounds. Using the recrystallization technique‚ a solid compound is dissolved in a solvent and the compound slowly crystallizes as the solution cools. Using a filtration technique‚ a pure solid is produced when the molecules of the impure particles in the compound are excluded from the crystal lattice. After obtaining the pure compound‚ a melting point determination procedure can be done using a mel-temp device to correctly
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The kinetic equation‚ half-life values‚ correlation coefficient and pre-harvest interval (PHI) of the trifloxystrobin and tebuconazole residue dissipation were calculated from the experimental data and summarized in Table 4. The dissipation dynamics of trifloxystrobin on green tea leaves followed a first-order rate equation as follows C = 2.5472e-0.245x (r=0.9797) and C = 6.5457e-0.207x (r= 0.9804) with the half-life of 2.83 and 3.34 days for trifloxystrobin at RD and DRD‚ respectively. The half-life
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ODD ONE OUT 1. Find the odd one out. A. Ginger B. Garlic C. Chilli D. Potato ANS-C Explanation Chilli is modified stems 2. Find the odd one out A. Eagle B. Hawk C. Bird D. None of these ANS-C Bird is prey of another bird 3. Find the odd one out A. Credit B. Deposit C. Withdrawl D. None of these ANS-C Explanation Credit and deposit indicates addition in amount while withdrawl indicates reduction. 4. Find the odd one out A. Microscope B. Telescope C. Periscope D. Stethoscope ANS-D Explanation The stethoscope
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As ice freezes on the concrete‚ it creates a dangerous‚ slick surface. Driveways‚ sidewalks‚ patios‚ and parking lots covered with ice can cause falls‚ making you liable for injuries. So most people rely on deicers such as salt because it does a great job melting ice‚ but it also damages concrete surfaces over time. How does salt damage concrete surfaces? Salt lowers the pH balance in the concrete. Because it is acidic‚ it weakens the strength of the concrete and increases the sizes of the pores
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Ever wondered how ice skating works? Why the ice is slippery? Or just how to maintain enough balance to speed up? Well this article will explain why. Ice skating works because metal skate blades glide with very little friction over a thin layer of water on the ice surface. At one time‚ scientists thought skaters created the water layer by melting the surface layers of ice through the pressure of their body weight creating a melting point.. However‚ recent studies disproved that explanation and it
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Water has polarity. Polarity is the uneven distribution of charge. Water has cohesion‚ adhesion‚ and heat capacity. Cohesion is the attraction between molecules of the same substances. Adhesion is the force of attraction between molecules of a different substances. Heat capacity is the amount of heat it takes to raise temperature of a substance. The experiment displayed shows water can have adhesion and cohesion. The hypothesis of this experiment is if a nonpolar substance is added to water
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