Saturated or Not? Learning Objectives: Identify saturated & unsaturated compounds Discuss the role...
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Transcript of Saturated or Not? Learning Objectives: Identify saturated & unsaturated compounds Discuss the role...
![Page 1: Saturated or Not? Learning Objectives: Identify saturated & unsaturated compounds Discuss the role of fats in the diet Explain how vegetable oils can be.](https://reader036.fdocuments.in/reader036/viewer/2022062511/551bc2cc550346b4588b4bc4/html5/thumbnails/1.jpg)
Saturated or Not?
Learning Objectives:
•Identify saturated & unsaturated compounds•Discuss the role of fats in the diet
•Explain how vegetable oils can be made into biodiesel
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Ethane
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Dodecene
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Hexacosane
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Hex-2-ene
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C6H12
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C6H14
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Saturated
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Unsaturated
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Decolourises bromine
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Brown solution with bromine
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Burns with a sooty flame
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Burns with a dull flame
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Burns with a clean flame
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Formed when fats are
hydrogenated
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Used as monomers to
make polymers
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Fats in the diet
Advantages• Both saturated and non saturated
fats are needed for a healthy balanced diet
• Foods rich in fats and oils are rich in vitamin E
• Omega 3 and 6 oils are good for the brain, heart, and joints
• Cholesterol is needed to make hormones and cell membranes
• Lipids are useful energy storage molecules (adipose tissue)
• Hydrogenated fats have longer shelf life
Disadvantages• Too many saturated fats can lead
to heart disease etc…• Hydrogenated trans fats raise LDL
levels lower HDL levels and inc risk of CHD. They cannot be metabolised so stay in blood longer
• Trans fatty acids are not kinky! Act like saturated fats
• Kosher/Halal/suitable for vegetarian/vegans
• Limited evidence suggested it may have a role in some cancers, liver disease, Alzheimer’s diabetes
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Veggie Power• Vegetable oil contains a lot of energy it can be used as a
fuel – biodiesel.
• Biodiesel is a CLEAN fuel• It is RENEWABLE• It is CARBON NEUTRAL• Helps to reduce use of crude oil
• The vegetable oil is chemically digested to make it a better fuel
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Bioethanol
• Produced from fermenting sugar from crops• RENEWABLE and CLEAN
• Glucose ethanol + carbon dioxide
• C6H12O6 2C2H5OH + 2CO2
• Ethanol is a good fuel, it burns easily in air to form CO2 and H2O
yeast
yeast
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Non Renewable Ethanol
Ethene + steam Ethanol + hydrogen
Ethene comes from CRACKING crude oil products (Remember oil is heated to 800°C with a CATALYST – long chain ALKANE broken down to smaller alkene + alkane)
Ethanol produced chemically from crude oil is still cleaner as a fuel but it is NON RENEWABLE
catalyst
High pressure
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• Workbook pages 85-88 to be completed for