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Ionic and covalent bond
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- Words:
- 700
- Submitted:
- Mon Aug 31 2009
- Mark submitted by Author:
... Notes for test of Unit 1 Atoms in a Solid, Liquid, Gas Compounds * Compounds are 2 or more elements chemically combined * The properties of a compound are different from the elements it has been made from When a compound forms: * The substances chemically react to form a new compound * The composition of a new compound is always the same * The properties of the new compound are very different from its element * The compound cannot be easily separated In a chemical reaction: * New chemical substances are formed * Generally the process is not easily reversed * Energy is often given out Diffusion * Diffusion involves the movement of particles from a region of higher concentration towards a region of lower concentration. Eventually the particles are evenly spread and the concentration is equal. * Diffusion does not happen in solids * Diffusion is the way we smell things from far away The Atom * Atomic (proton) number gives the number of protons * An
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