4.2 Ionic and covalent bonding

We begin by applying simple bonding theories to molecular chlorine gas (Cl2) and non-molecular sodium chloride (NaCl), whose structures were discussed in Section 1. Figure 28 shows the result.

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Today We Drop Bombs, Tomorrow We Build Bridges: how foreign aid became a casualty of war [Audio]
Speaker(s): Peter Gill | In his latest book Peter Gill reveals how the ‘war on terror’ has ravaged the independence and neutrality of humanitarian aid, with serious consequences for relief operations. Focusing on Turkey, Afghanistan, Somalia and Pakistan he explains how western counter-terror laws are restricting humanitarian relief operations and costing lives. Peter Gill is a current affairs reporter working in Asia, the Middle East and Africa. Michiel Hofman is the Senior Humanitarian Spe
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Alporas' closed cell aluminium foam
Additions are made to molten aluminium or aluminium alloy to modify the melt viscosity and make it suitable for foaming. 1 to 3 wt% titanium hydride is then added to the melt, and this foams the melt by releasing hydrogen. The foamed melt solidifies to yield a closed cellular structure with an average cell size of 4.5 mm
Author(s): DoITPoMS, University of Cambridge,Dr V Gergely, De

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Acknowledgements

Course image: Argonne National Laborator in Flickr made available under Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence.

Grateful acknowledgement is made to the following sources for permission to reproduce material in this course:

Except fo
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2.3 A closer look at ethical issues

Science can define what is practicable, what can be done, but it cannot determine which developments it is right to pursue; this is largely an ethical judgement. One sensible approach in making an ethical assessment is to try to weigh up the benefits of a technology against its potential to do harm. Deciding whether GM technology is acceptable, in ethical terms, then involves a judgement about the plausibility and moral weight of competing sets of claims. Individuals may make widely different
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Simulation of using a thodolite to calculate the height of a building.
Author(s): Leeds Metropolitan University

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Count to 20 - A hip counting song for kids
COUNT TO 20! A hip counting song for young kiddos... Enjoy!  (1:26)
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4.1 Scientific approaches

Even after many years of research, the phenomenon of hibernation continues to be a mystery to scientists. Despite coming nearer to an understanding of how and why it happens, some fundamental questions remain unanswered. Is there a genetic basis underlying the evolutionary predisposition of animals to hibernate, given its occurrence in many groups of vertebrates and invertebrates? Is the problem of metabolic adaptation in cells separate from thermal regulation which occurs throughout the orga
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Jessica Cantlon to deliver educational neuroscience talk April 11
“Math and Logic in Monkeys, Children and Remote Cultures,” will take place Thursday, April 11 at Hobbs Hall.
Author(s): Joan Brasher

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4.2 Other members of the bear family

Other omnivorous species of bear include the Asian black bear, the North American black bear and the Andean spectacled bear. Although polar bears spend their winters hunting seals out on the Arctic sea-ice, they have to come ashore when the ice melts in spring and find other sources of food.

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GLS 2010 highlights
Highlights of London Business School's Global Leadership Summit 2010, held on 5 July. The theme was emerging markets: "New Frontiers: Expansion, Opportunity and Innovation."

Newsreel - Kennedy Inspects Missile Center [11-18-1963]
News broadcast of President Kennedy viewing a missile launching demonstration at an Air Force base in Florida.
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1.2 The formation of NHS trusts

Figure 2.6

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3 Hot dry rock (HDR) fields

Heat flow through some parts of the continental crust can be well above normal locally because the underlying rocks contain abnormally high concentrations of uranium, thorium and potassium, which generate considerable heat. To add significantly to surface heat flow and thereby create high-temperature anomalies at shallow depths requires a large volume of such radioactive rocks. This condition is satisfied by some, but not all, granitic igneous intrusions, whose original magma became ch
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COMP1216 - Test Design
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Tissue engineering and stem cell technology
A lecture, "Tissue engineering and stem cell technology" given by Prof ZhanFeng Cui, University of Oxford, at the 10th OIBC Spring Symposium, held jointly with the Department for Continuing Education, at St Edward's School, Oxford, on 4 March 2009. Visit http://media.conted.ox.ac.uk/oibc2 to view the full presentation from Prof ZhanFeng Cui, including his slides.
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