was made by German chemist Johann Dobereiner. In 1817 Dobereiner noticed that certain elements that were chemically similar could be grouped together in threes‚ for example‚ calcium‚ strontium‚ and barium; lithium‚ sodium‚ and potassium; chlorine‚ bromine‚ and iodine. In each group of three‚ the atomic weight of one element fell halfway between the atomic weights of the other two elements. Based on his discoveries‚ Dobereiner proposed the Law of Triads in 1829. His work made other scientists want to
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Amines and Amides Amine - an ammonia molecule (NH3) in which one or more H atoms are substituted by an alkyl or aromatic group. Amide - an organic compound with a carbonyl functional group (C=O) bonded to a nitrogen atom. Amines are the smaller and simpler products of the decomposition of larger and more complex organic compounds like proteins. They often have foul odours‚ as do many nitrogen compounds‚ such as the smell of rotting fish and decomposing animal tissue and are produced by
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EXPERIMENT TWENTY Qualitative Analysis of Anions Analysis of Solutions Containing the Ions Cl-‚ Br-‚ l-‚ SO42-‚ CO32-‚ and NO3- This experiment continues the qualitative analysis begun in Experiment 19. Here we will be analyzing solutions to determine the presence of anions. The same techniques that were used for the cation analysis must be used for the anions. If you have not carried out Experiment 19‚ read the introductory section before starting this experiment. The major difference
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Experimental Design (70 points) Title | How the Volume of the Slurry Mix Effected the Biogas Generator | Type of Experiment | Experimental | Background Information | Methane is a chemical compound with the chemical formula CH4. It is the simplest alkane‚ the main component of natural gas‚ and probably the most abundant organic compound on earth. For this experiment we had created a bio gas generator. A biogas generator is any gas fuel derived from the decay of organic matter‚ as the mixture of methane
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Ethers have much lower boiling points compared to alcohols of comparable MWs. BPs of ethers increases with increasing MW. BPs of isomeric ethers increase with increasing alkyl chain length. BPs of ethers are about the same as those of alkanes of comparable MWs. Solubility of ethers in water is comparable to that of alcohols. As chain length of ethers increases‚ solubility in water decreases. Branching of the alkyl chain results in greater solubility since London forces are weaker
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Caroline Guidry Dr. Beverly A. Clement Organic Chemistry 2423‚ Section 304 25 October 2017 Lab 6: Natural Products I The main goal of this experiment was to employ isolation techniques to derive chemicals from two different natural sources and study their properties (Clement 91). The two natural sources used in this experiment were an orange (the peel contains limonene‚ which is a terpene) and a dichloromethane solution of clove oil (which contains eugenol‚ an acetogenin). To isolate the eugenol
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have a shiny appearance * are usually poor conductors of heat and electricity * can be solids‚ liquids‚ or gases at room temperature solid liquid gas sulfur bromine nitrogen carbon oxygen Nonmetals‚ and Metalloids Metalloids: * are located on the solid line that starts
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Table Lab Look up all the halogens‚ give their name and formula. Describe what each one looks like under normal conditions. Halogens contain salts and they are: 1. Flourine F Normal Conditions- Gas 2. Chlorine Cl Normal Conditions- Gas 3. Bromine Br Normal Conditions- Liquid 4. Iodine I Normal Conditions- Solid 5. Astatine At Normal Conditions- Solid Give the names and formulas of three compounds that contain one element from the Noble Gas family. 1. Helium He 2. Neon Ne 3. Argon
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Algae Could Solve World’s Fuel Crisis Von Philip Bethge Dan Robertson is working on algae that can produce biofuel. Genetically modified blue and green algae could be the answer to the world’s fuel problems. Bioengineers have already developed algae that produce ethanol‚ oil and even diesel -- and the only things the organisms need are sunlight‚ CO2 and seawater. For reasons of data protection and privacy‚ your IP address will only be stored if you are a registered user of Facebook and you
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NSS Chemistry Part 15 Analytical Chemistry (Structural Questions) HKCEE and HKAL Past Paper Questions 1. HKCEE 1994 Q8b A student carried out some tests on an ionic compound X which was a white solid. The results obtained were summarized in the following flow diagram: (i) Based on the above information‚ deduce the cation and anion present in X. (ii) Describe how the flame test on X can be carried out in the laboratory. (6 marks) 1 2. HKCEE 1995 Q2 In each of the following
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