Light Absorption by Photosynthetic Pigments in Silver Beet Abstract The aim of the experiment was to determine the absorption of differing wavelengths of light by individual pigments in the vegetable silver beet. Pigments were extracted from silver beet leaves and separated into chlorophyll a‚ chlorophyll b‚ and carotene via chromatographs. Chlorophylls were then separated and an absorption spectra created using results obtained from a spectrophotometer. It was clear there were two distinct peaks
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equal 148.09 g mol -1. This means that the empirical formula is also the molecular formula. As 12.01x10 carbons +1.008x12 hydrogens + 16= 148.09 09 g mol -1. From this knowledge the unknown molecule must include either an alcohol‚ aldehyde‚ ketone‚ ether or methoxy- functional group. Secondly it is important to calculate the degrees of unsaturation in the molecule. The degrees of unsaturation
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Name: Chen Yao Le Lab Group: Tues Email: A0111185@nus.edu.sg Matriculation Number: A0111185R Date of Experiment: 17 February 2015 Experiment 6: Synthesis‚ Electronic Spectra‚ Structural Isomerism: Octahedral Co(III) complexes with Chloride and Ethylenediamine Ligands Abstract: In this experiment‚ Δ/Λ-[Co(en)3]Cl3∙4H2O was synthesized and the absorbance in UV-vis spectrum was recorded
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Materials and methods 1. Raw materials Full ripe cactus Opuntia dillenii fruits were harvested from the orchard of Faculty of Agriculture‚ Suez Canal University‚ Ismailia Governorate‚ Egypt during December 2014. Fruits were washed and glochides and the two distal parts (top and bottom parts) were removed. The fruits were mashed in a mixer by mixing for 15 s. After that‚ the seeds were separated‚ washed and dried by hot air in a convective dryer (WT-binder‚ Type F115‚ Germany) at 50 ºC‚ air velocity
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larval stage of development. The P2 generation (the parent flies) must be discarded to insure that no interference with the offspring will occur. The P2 generation was transferred from the medium bottle to an empty bottle‚ and then etherised with ether and discarded. The medium bottle containing the F2 generation was placed back in the fly incubator room at 25°C. Week 5: Analysis of the F2 generation All the larvae of the F2 generation have developed into flies. All the flies were etherized‚ counted
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i am so afraid of any kind of insect especially cockroaches and i want to act before i have a problem with it. What do you suggest i do to prevent the insects from even approaching my house? If this happens‚ how do i minimize the problem? Thanks There is nothing more annoying than having a houseplant with an insect infestation and not knowing what to do about it. To prevent destruction from pesky insects‚ though‚ you must know what you are up against and what is effective to keep the pests away
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A. List of Chemical Reagents/Substances 400 ml Ethanol 400 ml Petroleum Ether 1000ml Sesame oil 200 g Beeswax 10 g Potassium sorbate 50 ml Rose oil 20 ml Vitamin E oil 20 ml Stearic acid B. List of Glasswares/Materials 2pcs. Mortar and Pestle 50pcs. Filter papers Beakers: 3pcs. 1000ml 2pcs. 400ml 2pcs. 100ml Graduated cylinders: 2pcs. 50ml 2pcs: 10ml Oven Amber bottles: 2pcs. 60ml 2pcs. 120ml Soxhlet apparatus Iron stand Iron clamp
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Bullying has been quite a growing problem in today’s society. Bullying is defined as any repeated negative activity or aggression intended to harm or bother someone who is perceived by peers as being less physically or psychologically powerful than the aggressor. The particular concern with the frequent bullying of children is that it will have an adverse impact on victims scholastic achievement‚ desire to attend school‚ and self-esteem (Olweus D.‚ Rigby K). Bullies are people. Bullies want power
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The Special Theory of Relativity Can Be Disproved Experimentally Gennady Sokolov‚ Vitali Sokolov. It is true that you may fool all the people some of the time; you can even fool some of the people all of the time; but you can’t fool all of the people all the time. Abraham Lincoln (USA‚ 1809-1865). Content 1. What the special relativity states. What is the postulate of the invariability 2. The optical experiments and observations that forced to receive the postulate of invariability of light speed
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Introduction The Diels-Alder Reaction is a reaction used in organic chemistry that builds rings very efficiently (1)‚ this cycloaddition process allows for the stereoselective formation of cyclohexene rings possessing as many as four contiguous stereogenic centers (3). This reaction occurs without intermediates‚ in a single step‚ which explains the stereospecificity due to substituents not being given the chance to “switch around”. (1)These six membered rings are synthesized by reacting a dienophile
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