应用化学专业英语 教学课件 ppt 作者 黄忠 谢普会 付颖 主编lesson 19 introduction to food chemistry.ppt

What is in food? How is cooking chemistry? What molecules are foods made of? Why do eggs look different cooked? What happens when dried pasta is cooked? What are additives? Types of additives Types of additives – activity What is an emulsion? Making an emulsion What stops emulsions from separating? Uses of additives Using additives What are E-numbers? What goes into food? Using chromatography What are plant oils? Using plant oils Chemistry of fats and oils What are the differences between fats? Testing for double bonds How is margarine made? The history of margarine What are trans fats? What are essential fatty acids? Plant oils activity How do you make bread? How does baking powder make cakes rise? What makes bread rise? How is alcohol made? Health and social issues of alcohol Is food naturally safe? Can cooking food make it harmful? How else can food become unsafe? Wheel of Misfortune: food risk game What are food chains? How do we know if food is safe? How can food risks be studied? Food safety True or false activity Glossary (1/3) Glossary (2/3) Glossary (3/3) Anagrams Multiple-choice quiz Photo credit: ? 2006 Jupiterimages Corporation Photo credit: ? 2006 Jupiterimages Corporation Teacher notes This voting activity enables the individual opinions of the class to be represented graphically. It could be used as a precursor to a debate on food safety. Discussion points could include: Should the government take responsibility for what people eat? Would banning foods deny consumers’ right to chose? How thorough is the research about food additives? How easy is it to avoid artificial additives? Should the precautionary principal be applied to food safety? Teacher notes This true-or-false quiz could be used to start a discussion about the social, health and economic issues relating to alcohol. More information about alcohol is available at: .uk/resources/factsheets/comparisons.pdf (consumption in young people) http://www.nhsdirect.nhs.uk/ar