Analysis of Hydrocarbons Jessa Grace B. Castillo* and Stephanie Chua Department of Chemistry‚ University of Santo Tomas‚ Manila‚ Philippines ______________________________________________ Hydrocarbons are organic compounds containing only hydrogen and carbons and further divided in major types. Hydrocarbons react differently in reagents. The basis of determining an unknown hydrocarbon is due to the differences in reactions of hydrocarbons. An unknown compound is determined using tests.
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benzene ring. Those compounds which contain more than one benzene ring are known as polynuclear aromatic hydrocarbon like naphthalene‚ anthracene etc. The aromatic compounds are generally taken as derivatives of benzene. Benzene and its derivatives are mainly used in synthetic organic chemistry. The main source of polynuclear aromatic compounds is coal tar. For example‚ naphthalene is the largest single constituent (6 - 10%) of coal tar. It is mainly found in middle oil fraction of coal tar distillation
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Hanging‚ Lethal Injection‚ Electrocution‚ Gas Chamber‚ and Firing Squad are the five methods of execution that were used in the United States. The most commonly used method today in the United States is lethal injection. Only 36 states in the US are authorized to carry out executions (Ecenbarger‚ 2010). Hanging was the primary method of execution used in the United States until the 1890s. Delaware and Washington have carried out a total of 3 executions by this method since it was re-introduced in
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The Open Mineral Processing Journal‚ 2011‚ 4‚ 25-44 25 Open Access Flotation Frothers: Review of Their Classifications‚ Properties and Preparation Hamid Khoshdast* and Abbas Sam Department of Mining Engineering‚ Faculty of Engineering‚ Shahid Bahonar University‚ 76169133‚ Kerman‚ Iran Abstract: The importance of frothers in flotation is widely acknowledged‚ particularly in terms of their role with respect to bubble size‚ and the stability and mobility of the froth phase. These factors
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the condensed structure of chromosome. They remain as loosely coiled chromatin. The nuclear membrane is still intact to protect the DNA molecules from undergoing mutation. 2. Prophase The DNA molecules progressively shortenand condense by coiling‚ to form chromosomes. The nuclear membrane andnucleolus are no longer visible. The spindle apparatus has migrate to opposite poles of the cell.. 3. Metaphase The spindle fibres attach themselves to thecentromeres of the chromosomes and align
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Unit Test Science V I. Match the animals with how they get and eat their food. Write only the letter. 1. Snake a. sucking blood with their tiny tubes 2. Frog b.using beaks to get their prey 3. Birds c. coiling their bodies to their prey 4. Lion d. catching insects with their sticky tongue 5. Mosquitoes e. tearing meat with their strong pointed teeth B. 1. mammals a. they have dry scaly skin 2. birds b. they have mammary gland that produce milk to feed
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Wole Soyinka‚ a contemporary Nigerian poet‚ says‚ “Power is domination‚ control‚ and therefore a very selective form of truth which is a lie.” The Wife of Bath‚ in Chaucer’s Canterbury Tales‚ claims that this power and domination is what women crave‚ but specifically over their husbands and lovers. Amy Elliott‚ the main character in Gillian Flynn’s Gone Girl‚ manipulates her husband emotionally and physically by framing him for her abduction and murder. When Amy’s plan goes awry‚ she decides to return
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1L/kg of material/hr. The following list contains some examples of Class 4 materials‚ but is not all inclusive: Flammable Solids Matches Nitrocellulose membrane filters Silicon powder Wetted explosives Sulfur Titanium Powder‚ wetted Zinc resinate Naphthalene Spontaneously Combustible Activated carbon Lithium alkyds Pentaborane Phosphorus Potassium sulfide‚ anhydrous Oily rags Seed cake Sodium sulfide‚ anhydrous Butyl lythium Dangerous When Wet Alkaline earth metal alloys
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and why? Post-lab Questions: 1. For the following pairs of solutes and solvent‚ predict whether the solute would be soluble or insoluble. It may be helpful to look up some of the chemical structures. (3pts) a. Malic acid in water b. Naphthalene in water c. Amphetamine in ethyl alcohol d. Aspirin in water e. Succinic acid in hexane f. 1-Decanol (n-decyl alcohol) in water 2. Predict whether the following pairs of liquids would be miscible or immiscible. It may be helpful
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mitosis. Mitosis is the nuclear division of the cell‚ separating the two copies of the genome and forming daughter nuclei. There are four stages in mitosis: prophase‚ metaphase‚ anaphase and telophase. Multiple changes occur in prophase including the coiling of the chromatin into chromosomes‚ the disappearance of the nuclear envelope and nucleoli‚ the migration of the centrosomes toward opposite poles and the construction of spindle apparatus‚ which are composed of protein fibers called microtubules.
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