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This course is the fourth and final part of a comprehensive introduction to Chemistry, covering everything you will need to know as you prepare for possible future exams. It doesn't matter how much, or how little, prior knowledge of Chemistry you've got as this course will take you through all the necessary stages.
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|Section 1: Chemistry 101 - Part 4 Chemistry in Society|
Introduction to Chemistry in Society
In Lecture 2 of Part 4 we begin to look at the industrial applications of chemistry, and more specifically how we extract metals from their ores. The method of extraction depends upon the position of metals in what we call the reactivity series. Metals high in the reactivity series will require a lot of energy to extract them from their ores, and electrolysis is often used. Metals in the middle of the reactivity series can normally be extracted by heating with carbon. Metals at the bottom of the reactivity series are usually found uncombined with other elements.
00:00 The Reactivity Series
07:06 The extraction of aluminium
11:57 The extraction of iron
15:40 Properties and uses of aluminium and iron
In Lecture 3 of Part 4 we look at the chemistry of crude oil. We begin by looking at oil formation, millions of years ago, and how we extract it from the ground. Crude oil is a very thick, viscous liquid made up of many different fractions that are separated by fractional distillation. Further refinement of the products involves cracking to produce fractions with the required molecular weights. But the products of crude oil can be polluting, particularly when they burn, and in the last part of the lecture we look at how fuels used in cars contribute to air pollution.
00:25 Crude Oil
02:45 Fractional distillation of crude oil
07:35 Cracking hydrocarbons
10:43 When fuels burn
13:50 Cars and air pollution
Lecture 4 of Part 4 follows on neatly from the previous section. We have already looked at how many products can be derived from crude oil. Plastics are very important products, and many are formed by the joining together of hydrocarbon chains. This is what we mean by the term 'polymerization' and here we look at both kinds - addition polymerization and condensation polymerization.
01:33 Addition polymerization
06:20 Condensation polymerization
The last content lecture of Part 4 wraps up with a description of some very important industrial processes. We start with what is arguably the most important - the Haber Process, used to produce ammonia from the atmospheric gases nitrogen and hydrogen. We then progress to look at the industrial production of sulphuric acid - known as the Contact Process. Our final section describes the industrial manufacture of sodium hydroxide and chlorine.
00:45 Ammonia (the Haber Process)
08:10 Sulphuric Acid (the Contact Process)
12:13 Sodium hydroxide and Chlorine
|Quiz 1||20 questions|
Twenty quick questions to test your understanding of the Chemistry in Society topic.
I have been a teacher in the UK for nearly 30 years, and am currently the Director of STEM (Science, Technology, Engineering and Maths) at a large comprehensive school in East Sussex. To bore you with the qualifications, I have a Joint Honours Degree in Botany and Zoology from University College, Cardiff, and a PhD in Biological Sciences from the University of East Anglia. I was also one of the first Advanced Skills Teachers in the South East of England.
I am a passionate believer in life-long learning, and I will do whatever I can to encourage learning for all ages. Using videos to enhance learning has great potential, and I try to exploit this through my websites.
On a personal level I am married to a primary school headteacher, and we have two grown-up daughters. When not creating videos or teaching I relax (!) by working out at the gym, watching rugby and football, and doing a little work around the garden.