Exercises to the text "Organic Chemistry"

1. Answer the questions to the texts:

  1. What aspects of our life are connected with organic chemistry?
  2. What place does organic chemistry hold among other disciplines?
  3. How long have humans been using practical application of chemistry? In what way?
  4. What do many plants contain?
  5. Were people able to use chemicals for most of human history?
  6. When did organic chemistry become a defined science?
  7. What is the other name for organic chemistry?
  8. When did people begin to look for specific chemicals in natural materials?

 

2. Insert prepositions wherever necessary:

  1. Every aspect of life involves … organic chemistry.
  2. Organic chemistry holds a central place … chemical studies.
  3. Humans have been using chemistry … thousands of years.
  4. Plants have been "milked", cut, boiled, and eaten … folk medicine remedies.
  5. Modern science has determined that many of these plants contain organic chemicals … effective medical uses.
  6. Many of our modern medicines are simply purified components … these plants.
  7. For most of human history, humans were able to use chemicals without actually understanding the science … them.
  8. Organic chemistry became a defined science (the chemistry of carbon compounds) … the 19th century.
  9. We learned how to make … new organic molecules rather than simply isolating and using those that were found nature.
  10. … the mid-19th century a new compound called aspirin was synthesized (chemically prepared from other chemicals).
  11. It was found to be well tolerated by patients … an effective analgesic.
  12. Plants provided ancient humans with many organic chemicals or mixtures of chemicals that were useful … purposes other than medicine.
  13. For most of this time, however, humans did not know that they were dealing … discreet molecules.
  14. … the 18th century people began to look … specific chemicals in these natural materials.
  15. This practice of isolating specific compounds (now known to be organic compounds) … natural sources was continued for many years and continues today.

 

3. Transfer the following sentences into Passive Voice:

  1. Every aspect of life involves organic chemistry.
  2. The fundamental principles of organic chemistry touch all disciplines.
  3. Many plants contain organic chemicals with effective medical uses.
  4. Chemists used derivatives of organic compounds.
  5. Ancient Egyptians ate roasted ox liver in the belief that it improved night vision.
  6. Plants provided ancient humans with many organic chemicals or mixtures of chemicals.
  7. Carl Wilhelm Scheele isolated acidic components from grapes and lemons.
  8. He formed precipitates with calcium.
  9. He added mineral acids to obtain the compounds.