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Did you know? Pure substances: elements and compounds
EduBook Organización
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Elements can be found in nature in different proportions. For example, on Earth, the most common elements are iron, oxygen and silicon (which is present in the silicon dioxide of the sand on beaches).…
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Interpret. A table
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In order to analyse the amount of humus in the soil, we react a sample of it with hydrogen peroxide. The carbon in the organic material reacts with this compound and as a result, the reaction gives off…
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Check. Test yourself
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Remember what you have studied in this unit and answer the questions: Why is it easy to compress a gas, but not a solid? What is the difference between chemical elements and chemical compounds? Are…
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Pure substances: elements and compounds
EduBook Organización
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3.1. Pure substances and mixtures Pure substances are substances which have a fixed composition and properties which allow us to identify them. Mixtures are made up of two or more pure substances. 3.2.…
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Sustainable Energy
Tiching explorer Organización
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This is an overview of "Sustainable Energy - Without the Hot AIr" by David JC MacKay. It takes Britain as an example for statistics. It points out to what extent we are fossil fuel addicted…
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Write names and formulas. Matter and its properties
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Escribe las formulas correspondientes sin subíndice. Por ejemplo CO2 se escribe CO2. Remember what you have learnt about the formulas and names of binary compounds and do the following activities: Give…
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Simplified MRI
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Magnetic Resonance Imaging (MRI) can tell if we have a tumor. Our head is full of tiny radio transmitters (the nuclear spins of the hydrogen nuclei of our water molecules). In an MRI unit, these little…
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Unit 8: The Earth, a Living Planet
EduBook Organización
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Asexual reproduction (n): the process of reproduction of a single organism by itself. autotroph (n): an organism that produces its own food for nutrition. bioelement (n): any of the chemical elements…
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