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. 1 Read and translate the text How I will calculate concentration
| But we don’t say: I am going to go to Paris instead we say I am going to Paris.
Vocabulary calculation – расчет to calculate – рассчитывать solution – раствор but – но amount – количество solute – растворенное вещество to dissolve – растворять solvent –растворитель after that – после этого then –затем add – добавлять to become – становиться to exist – существовать another phase – другая фаза ethanol – этанол water – вода small – небольшой to identify – определять (вещество, состав вещества, соединения) to be ready – быть готовым to determine – определить to express – выражать a volume объем percent composition by mass – процентное содержание на массу volume percent – процент по объему mole fraction – молярная доля molarity – молярность to divide by – делить на to multiply by – умножить на preparation – приготовление to prepare a solution – приготовить раствор total number – общее число mol – моль chemical species– химические вещества, химические соединения per – на ( при расcчетах) mole fraction – молевая фракция to turn red – краснеть Ex. 1 Read and translate the text How I will calculate concentration Hello, my name is Tim. I am a teacher. I am teaching chemistry at school. Tomorrow I will calculate the concentration of a chemical solution. The calculation of the concentration of a chemical solution is a difficult task. What is concentration? Concentration is the amount of solute which I will dissolve in a solvent. A solute is a solid which I will add to a solvent. My solute will exist in another phase. Then I will add a small amount of ethanol to water. The ethanol will be the solute and the water will be the solvent. After that I will add a small amount of water to a large amount of ethanol, and the water will become the solute. I will identify the solute and solvent in a solution. Then I will be ready to determine its concentration. I will express concentration with a help of percent composition by mass, volume percent, mole fraction, molarity, molality. Percent composition by mass is the mass of the solute which I will divide by the mass of the solution (mass of solute plus mass of solvent) and multiply by 100. I will use volume percent. The volume percent will help me in the preparation of the solution. Mole fraction is the number of moles of a compound which I will divide by the total number of moles of all chemical species in the solution. Molarity is the number of moles of solute per liter of solution. жүктеу/скачать 422,31 Kb. Достарыңызбен бөлісу:
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