Mosquito coils are widely used as mosquito repellent. The major active ingredients of most mosquito coils are pyrethrins‚ accounting for about 0.3 – 0.4% of the coil mass. When a Mosquito coil is burnt‚ the insecticides evaporate (pyrethrin‚ PAH‚ aldehyde etc.) with smoke‚ which prevent the mosquito from entering the room and harm those already in the room. The remaining components of mosquito coils include organic fillers‚ binders‚ dyes and other additives capable of burning well without flame. The
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Chapter 5: Solutions‚ Colloids‚ and Membranes Chapter Summary Mixtures and Solutions * A mixture maintains its identity regardless of the proportions of its components. * A mixture can be separated into its pure components through physical separation techniques. * The components are distributed uniformly throughout a homogenous mixture. * The components are not distributed uniformly throughout a heterogeneous mixture. * A solution is composed of a solvent and one or more solutes
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are also reducing sugars but less reactive than monosaccharides. By mixing the sugar solution with Benedict’s solution and heating them‚ a redox reaction will occur. The copper (II) sulphate present in Benedict’s solution reacts with electrons from aldehyde or ketose group of reducing sugars to form cuprous oxide‚ a red brown precipitate. Materials: The materials used in order to detect starches was: test tubes‚ distilled water‚ Benedict’s solution‚ starch were used. Negative Control: H20 Positive
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Lesson 08.01: Half-life and Radioactive Decay · Distinguish between nuclear and chemical reactions. · Compare and contrast different types of nuclear decay and the properties of the three types of radiation (alpha‚ beta‚ and gamma) discussed in the lesson. · Be able to predict the isotope or radiation produced by a nuclear decay reaction when the other product is given. · Describe and make predictions regarding half-life‚ including using a graph or set of data to determine the half-life of
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Chemistry GENERAL CHEMISTRY: Atomic Structure and elementary quantum mechanics: Blackbody radiation‚ Planck’s radiation law‚ photoelectric effect‚ Compton Effect‚ de Broglie’s hypothesis‚ Heisenberg’s uncertainty principle. Postulates of quantum mechanics‚ Schrodinger wave equation and a particle in a box‚ energy levels‚ wave functions and probability densities‚ Schrodinger wave equation for H-atom‚ Separation of variables‚ Radial and angular functions‚ hydrogen like wave functions‚ quantum numbers
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We performed two procedures in which we reduced methyl acetoacetate. For the first procedure we produced a racemic mixture of Methyl (S)-3-Hydroxyacetate and Methyl (R)-3-Hydroxyacetate. For the second we produced only one of the enantiomer products depending on which enantiomer of Tartaric Acid was used. A reduction is a reaction which generally means adding more carbon-hydrogen bonds to a compound. In a reduction reaction the oxidation number of a carbon atom decreases. The opposite is an oxidation
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1.5.1 Comparison of Three Isomers of Butanol Introduction: An alcohol’s reactivity is determined based on the attachment of their hydroxyl functional group. The location of this hydroxyl functional group will impact the molecular structure of the alcohol‚ making it either primary (1° )‚ secondary (2° )‚ or tertiary (3° ). If the OH is bonded to only one other carbon‚ it is a primary alcohol (eg. 1-butanol); if bonded to two other carbons‚ it is a secondary alcohol (eg. 2-butanol);
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Experiment 4: Borohydride Reduction of 2-Methylcyclohexanone Introduction: When learning about reduction reactions‚ we know that the addition of nucleophilic hydride anion (H-) to the carbonyl group will in turn result in the reduction of aldehydes to primary alcohols. Borohydride‚ and Lithuim aluminum hydride are commonly used as reducing agents. We can note that both of these reagents have a (H-) anion‚ hence it will be a powerful base and also take the role of being the nucleophile. For
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Structural Diagram Physical Properties Glucuronolactone is a white solid odorless compound. Soluble in hot and cold water. Chemical Properties Its melting point ranges from 176 to 178 °C The compound can exist in a monocyclic aldehyde form or in a bicyclic hemiacetal (lactol) form. The molecular weight of this compound is 176.12412 [g/mol] Natural sources of Glucuronolactone Glucuronolactone is a chemical that occurs naturally in the body and is used to build many of the
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Analysis of an Unknown Mixture Performed: 2/13/14 Submitted: 3/3/14 Abstract: The purpose of this experiment was to separate and identify the two unknown compounds. The sample used was 105 and it contain 2-propanol and 2-heptanone. IR spectrums were taken of the contents of the second and sixth test tubes and showed the presence of an OH functional group and a small amount of ketone in test tube two and a large presence of ketone in test tube six. The average boiling points of the test tubes
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