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A twist on the candle mystery

In a classic demonstration of the candle mystery, three lit candles of different heights are covered with a gas jar (see figure 1) and the tallest candle goes out first. This happens because carbon dioxide produced from burning has a higher temperature, so it rises and accumulates at the top of the…

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Quiz: elemental pursuit

How much do your students know about the properties of the chemical elements and how they are used? Find out with this elements quiz, based on…

     

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Do you know your water footprint?

Fresh water is a scarce resource on our planet – but how many of us are aware of how much water is needed to make the foods we eat every…

 


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