particles - definations
- Created by: AdamWilson99
- Created on: 15-04-15 14:52
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- particles
- Molecule
- A cluster of non-metal atoms that are chemically bonded together
- The atoms in a molecule are joined by covalent bonds
- The atoms always join in fixed ratios and molecules have a specific formula, eg H2O or N2
- There are molecules of compounds (eg CH4) and molecules of elements (eg O2)
- Element
- A pure substance that is listed on the periodic table and only has one type of atom in it
- There are over 100 elements d
- Most are metals, a few are semi-metals, and the rest are non-metals
- Compound
- Elements bond in fixed ratios and so can be represented by a chemical formula. For example, sodium chloride has the same number of sodium ions and chloride ions, so its formula is NaCl
- A pure substance made from more than one type of element chemically bonded together
- Mixture
- Air is a mixture that contains the elements nitrogen, oxygen and argon, and also the compound carbon dioxide
- Mixtures can usually be separated by physical techniques such as filtering and distillation
- An impure substance made from different elements or compounds
- Atom
- The smallest particle of an element
- cannot be split up
- Molecule
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