STUDY QUESTIONS 1. Write short notes on development of chemistry-a historical perspective 2. How does chemistry help in the production of food? 3. How can you say chemistry plays a vital role in the production of cosmetics? 4. (a) Define polymer chemistry (b) Write at least three synthetic fibres and explain their properties and uses
Answers
1) Jot down misery took its present scientific form in the 18th century when careful quantitative experiments by Lavoisier, Proust, and Dalton resulted in the law of definite proportions, the law of conservation of mass, and the law of multiple proportions, which laid the groundwork for Dalton's atomic theory of matter.
2) Chemical substances can play an important role in food production and preservation. Food additives can, for example, prolong the shelf life of foods; others, such as colours, can make food more attractive. Flavourings are used to make food tastier. Food supplements are used as sources of nutrition.
3) Chemicals, both natural and synthetic, are added to cosmetics to provide an appealing fragrance. ... There are over 3,000 chemicals used to formulate the huge range of fragrances used in consumer products worldwide.
4) a) Polymer chemistry is a sub-discipline of chemistry that focuses on the chemical synthesis, structure, and chemical and physical properties of polymers and macromolecules.
b) Nylon, terylene, rayon are the different kinds of synthetic fibres. Other types of fibres include artificial silk or alginate yarn are regenerated from carbohydrates and materials. There are also some fibres that that is regenerated from the protein and bridal regenerated from groundnut protein.