Методическая разработка по английскому языку для студентов факультета химии и химической технологии " Simple Chemistry" Алматы 2017
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мет. разработка по химии
- Бұл бет үшін навигация:
- Ex.2 Answer the questions
- Ex. 3 Complete these sentences. Use must, have to or should
| Ex.1 Read and translate the text
Alkenes In organic chemistry, an alkene is an unsaturated hydrocarbon that contains at least one carbon–carbon double bond. Acyclic alkenes, with only one double bond and no other functional groups form a homologous series of hydrocarbons with the general formula CnH2n. The simplest alkene, ethylene (C2H4), with the International Union of Pure and Applied Chemistry (IUPAC) name thane, is the organic compound which people produce on the largest scale industrially. Chemists often draw aromatic compounds as cyclic alkenes, but their structure and properties are different and they are not considered to be alkenes. The physical properties of alkenes and alkanes are similar. They are colourless, nonpolar, combustible, and almost odorless. The physical state depends on molecular mass: like the corresponding saturated hydrocarbons, the simplest alkenes, ethene, propene, and butene are gases at room temperature. Linear alkenes of approximately five to sixteen carbons are liquids, and higher alkenes are waxy solids. Alkenes are relatively stable compounds, but are more reactive than alkanes, either because of the reactivity of the carbon–carbon pi-bond or the presence of allylic CH centers. Alkenes serve as a feedstock for the petrochemical industry because they can participate in a wide variety of reactions, polymerization and alkylation. Ex.2 Answer the questions 1. What is alkene? 2. What are the physical properties of alkenes? 3. What is the difference between alkanes and alkenes? 4. How do chemists draw aromatic compounds of alkene? 5. How do you understand carbon-carbon double bond? Ex. 3 Complete these sentences. Use must, have to or should 1. I …. finish my experiment in time. 2. All schoolchildren …….observe safety regulations when they work in the chemical laboratory. 3. You look very ill. You …. see a doctor. 4. I … check my results once again. It seems to me that I have made a mistake in calculations. 5. When schoolchildren carry out experiments with acids they … wear special gloves. 6. You … understand the mechanism of the formation of pi bonds. I will include this theme in the examination materials. 7. If you want to pass your exam well you … read this book. жүктеу/скачать 422,31 Kb. Достарыңызбен бөлісу:
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