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Classifying Chemicals

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Introduction

Chemistry Revision Notes - Classifying Chemicals Periodic Table - chemical elements arranged in order of increasing atomic number. Arranged in rows so that elements with similar properties are in the same columns (groups). An element is a pure substance that cannot be chemically broken down into anything simpler e.g. hydrogen, oxygen, nitrogen and magnesium. Group 1 of periodic table: The Alkali Metals: These are all very reactive metals, forming compounds with almost all of the non-metals. ...read more.

Middle

2. Prevents contact with water and moisture in the air. The transition metals: These metals, found in the centre of the periodic table, have high melting points. Their compounds are usually coloured e.g. blonde hair contains titanium compounds, brown hair has iron compounds. They are very useful metals from buildings to hip replacements. Some are catalysts. A catalyst is a chemical that speeds up a reaction without being changed itself e.g. ...read more.

Conclusion

This whole group of elements is very unreactive and exist as single atoms (monatomic). All the noble gases have boiling points well below room temperature. So they are all gases. They are all found in the atmosphere - i.e. in the air - and all extracted from the air. Uses: * Helium - balloons, airships, heliox (oxygen and helium mixture) for deep sea diving. * Neon - strip lights coloured). * Argon - light bulbs * Krypton - lighthouse bulbs. * Xenon - strobe lights. ...read more.

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