elements in group 15 from period 2 - 5‚ give the name and symbol of each. Give a biological use for each (click on the element and then on the term "biology" in the margin). 1. Nitrogen N nitrogen is a key component of biological molecules such as proteins (which are made from amino acids‚ and nucleic acids. The nitrogen cycle in nature is very important. 2. Phosphorus P phosphorus is a key component of biological molecules such as DNA and RNA. Phosphorus is a component of bones‚ and teeth‚ and
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the mass of this compound. Plant foods contain three essential nutrients that are not readily available from soils. These are soluble compounds of nitrogen‚ phosphorus‚ and potassium. A typical label on a plant food will have a set of numbers such as 15-30-15. These numbers mean that the plant food is guaranteed to contain at least 15% nitrogen‚ 30% phosphorus (expressed as P2O5) and 15 % potassium (expressed as K2O). The remaining of the product is fillers‚ dyes and other anions and cations to
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reaction between hydrazine‚ N2H‚‚ and dinitrogen tetroxide‚ N204‚ has been used to launch rockets into space. The reaction produces nitrogen gas and water vapor. a. Write a balanced chemical equation for this reaction. b. What is the mole ratio of N.‚04 to N2? C. How many moles of N2 will be produced if 20 000 mol of N2H‚ are used by a rocket? d. How many grams of H20 are made when 450. kg of N204 are consumed? jjj2. Joseph Priestley is credited with the discovery of oxygen. He produced O.‚ by heating
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by farmers who engage in mixed farming‚ so in effect there is no or little waste generated. Research has shown that even though cow dung and poultry droppings are high in organic matter and also rich in nutrients‚ its composition on the basis of nitrogen‚ phosphorus and potassium (n.p.k) which is
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they are used. Amines are an organic derivative of ammonia‚ and like ammonia‚ amines have a nitrogen atom with a pair of electrons. You can identify an amine by its functional group. In every amine‚ there is an amino (NH2) attached to a hydrocarbon chain. You can recognize the amino in an amine’s structural formula: R-NH2‚ where “R” is the hydrocarbon chain and “NH2” is the amino (containing one nitrogen molecule and two hydrogen molecules). There are two ways to name an amine. The common name and
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We breathe in the air present in the atmosphere. Therefore if the air around us is contaminated with poisonous gases‚ it would have a fatal effect on us. Air Pollution Air Pollution (Image source: sxc.hu) The air naturally comprises of 78% of nitrogen‚ 21% of oxygen‚ 0.9% of oxide gases and 0.1% of inert gases. When this balance is disturbed‚ it causes disruptions of severe proportions. What Causes Air Pollution? Partially combusted exhaust gases released
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Univ SCIENCE B 2006 7(1):79-84 79 Journal of Zhejiang University SCIENCE B ISSN 1673-1581 http://www.zju.edu.cn/jzus E-mail: jzus@zju.edu.cn Relationship between malt qualities and β-amylase activity and protein content as affected by timing of nitrogen fertilizer application* CHEN Jin-xin (陈锦新)‚ DAI Fei (戴 飞)‚ WEI Kang (韦 康)‚ ZHANG Guo-ping (张国平)†‡ (Department of Agronomy‚ Zhejiang University‚ Hangzhou 310029‚ China) † E-mail: zhanggp@zju.edu.cn Received Aug. 25‚ 2005; revision accepted Oct.
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• The total carbon component completely gets oxidized to produce CO2 and no fuel is produced. • Some form of nitrogen is also lost in the form of ammonia. • Biogas is produced from wet biomass with about 90-95% water content by the action of anaerobic bacteria. • The conversion process is known as anaerobic fermentation (or biodigestion). • Nutrients such as soluble nitrogen compounds remain available in solution and provide excellent fertilizer and humus. • The energy available from
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placed under the front seat by most carmakers. (See photo) ) Cars produce a lot of harmful emissions‚ but the main ones are: carbon monoxide which is a piousness gas‚ hydrocarbons which is mostly produced by evaporated‚ unburned fuel and nitrogen oxides‚ which cause irritation to human mucus membranes. But how does a catalytic converter help reduce the emissions? To answer this question‚ we first need to look into what a catalyst is. A catalyst is a substance‚ which accelerates a chemical
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Explosives A chemical explosive is a compound or a mixture of compounds susceptible of a rapid chemical reaction causing a quick physical outburst of gases or heat radiation. The first explosives were created by the Chinese in the 11th century. These were mixtures of nitrate salts‚ sulfur and charcoal‚ now known as black powder. Gunpowder which is a low explosive‚ exhibits deflagration‚ or rapid burning‚ rather than detonation‚ the reaction exhibited by high explosives. While‚ perhaps counterintuitively
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