Ammonia Production Social Relevance Report essays

Ammonia Production Social Relevance Report essays Ammonia is a colourless alkaline gas with the formula NH3 and is made up of one part nitrogen and three parts hydrogen. It is lighter than air and has a sharp, stinging odour. Ammonia can be inhaled safely if it is greatly diluted in air, but concentrated ammonia gas can cause suffocation and death. Ammonia does not burn is air, but it burns in oxygen with a weak yellow flame. Properties: - Ammonia gas is extremely soluble in water, as it is able to form hydrogen bonds with polar water molecules. It changes to a liquid at  ¡V33.35 oC. Liquid ammonia boils at the same temperature. It freezes to a clear solid at 77.7 oC. In going from a liquid back to a gas, ammonia absorbs a large amount of heat from its surroundings. Upon evaporation, one gram of ammonia absorbs 327 calories of heat. For this reason, ammonia is widely used in refrigeration equipment. Liquid ammonia is used in the chemical laboratory as a solvent. It is a better solvent for ionic and polar compounds than ethanol, but not as good as water; it is a better solvent for nonpolar covalent compounds that water, but not as good as ethanol. It dissolves alkali metals and barium, calcium and strontium by forming an unstable blue solution containing the metal ion and free electrons that slowly decomposes, releasing hydrogen and forming the metal amide. Compared to water, liquid ammonia is less likely to release protons (H+ ions), but is more likely to take up protons to form NH4+ ions and is a strong reducing agent. Ammonia takes part in many chemical reactions. It reacts with strong acids to form stable ammonium salts, with hydrogen chloride it forms ammonium chloride, with nitric acid to form ammonium nitrate and with sulfuric acid to form ammonium sulfate. Ammonia reacts with certain metal ions to form complex ions called ammines. It also takes part in oxidation and reduction reactions. It burns in oxygen to form n ...

French Attributive Adjectives - Adjectifs épithètes

French Attributive Adjectives - Adjectifs à ©pithà ¨tes Attributive adjectives are used to describe or emphasize some attribute (characteristic) of the noun they modify. Known as à ©pithà ¨tes in French, attributive adjectives are a subcategory of qualifying (descriptive) adjectives. The defining characteristic of attributive adjectives is that they are joined to the noun they modify - immediately preceding or following it with no verb in between. une jeune fille  Ã‚  Ã‚  young girlun nouveau livre  Ã‚  Ã‚  new bookune question intà ©ressante  Ã‚  Ã‚  interesting questionun restaurant cà ©là ¨bre  Ã‚  Ã‚  famous restaurant An attributive adjective emphasizes some aspect of the noun which is essential to the meaning of the noun but not necessarily to the sentence. That is, the à ©pithà ¨te can be dropped without changing the essential meaning of the sentence: Jai achetà © un nouveau livre rougeJai achetà © un nouveau livreJai achetà © un livre Both nouveau and rouge are attributive adjectives, and both can be dropped without hurting the essential meaning of the sentence: I bought a book. Including new and red simply provides additional information about the book that I bought. Types There are three types of attributive adjectives: Épithà ¨te de nature - indicates a permanent, inherent qualityun pà ¢le visage - pale faceune pomme rouge - red appleÉpithà ¨te de caractà ¨re - describes an individual, distinguishing qualityun cher ami - dear friendun homme honnà ªte - honest manÉpithà ¨te de circonstance - expresses a temporary, current qualityune jeune fille - young girlun garà §on triste - sad boy Agreement Attributive adjectives must agree in gender and number with the nouns they modify. Placement Like all descriptive French adjectives, the majority of à ©pithà ¨tes follow the noun they modify. However, à ©pithà ¨tes precede the noun when: the adjective noun is considered a single unit of meaningthe adjective is describing rather than qualifying (limiting) the meaning of the nounit just sounds better As you can see, there are no hard and fast rules for determining whether an à ©pithà ¨te should precede or follow the noun it modifies, but there are some general guidelines that can help: Precede the noun Follow the noun pithtes de nature pithtes de circonstance Figurative or subjective meaning Literal or objective meaning Size and beauty(petit, grand, joli...) Other physical qualities(rouge, carr, costaud...) Single-syllable adjective +multi-syllable noun Multi-syllable adjective +single-syllable noun Ordinal adjectives(premier, deuxime...) Categories + relationships(chrtien, franais, essentiel...) Age(jeune, vieux, nouveau...) Present participles and past participlesused as adjectives (courant, lu...) Goodness(bon, mauvais...) Modified adjectives(un raisin grand comme un abricot)