Monthly Archives: January 2009

Rising Sea Levels – Expansion

TEMPERATURE RISE ºC Making models of climate change is very difficult because there are many factors involved. When the Sun shines on the 70% of the Earth that is water , two factors will contribute to an accelerated rise in sea … Continue reading

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Avogadro – we do huge

A mole is an amount of stuff. In 2g of hydrogen gas – or 1 mole – there are 600000000000000000000000 [six times ten to the twenty-three] molecules of hydrogen the same number as in 18g of water – can you … Continue reading

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Mass Spectrometry: Finding isotopes

Over a hundred years ago, the study of gas discharges led to the discovery of anode and cathode rays, which turned out to be positive ions and electrons. We got better at separation of these positive ions which enabled the … Continue reading

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Temperature & Thermometers

Temperature is the degree of hotness of a body. A thermometer tells us how hot by assigning a number to a temperature based on fixed points. A fixed point is a physical property that doesn’t change, such as the freezing … Continue reading

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Evaporation

On average, the molecules in a glass of water do not have enough heat energy to escape from the liquid, or else the liquid would turn into vapour quickly. When the molecules collide, they randomly bump into each other and … Continue reading

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Metallic bonding – a bit more

As we discussed in class, go to this site for an overview of bonding, including metallic bonding. We’re reminded that metals exist in a regular crystalline lattice, hence are shiny, densely packed with up to 12 nearest neighbours or touching … Continue reading

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Fullerenes – carbon allotropes plus graphene (updated)

“Suppose we could find a material that is hundreds of times stronger than steel. Suppose that same material could also be used to make electronic circuits much smaller than today’s silicon-based computer chips? Well, such a material has been discovered … Continue reading

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