changes in matter 2019

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  Changes in Matter  Recap of Atoms/Molecules/Elements/ Compounds ã Atom → smallest particle of matter  – Smallest part of an element ã Ag, Fe, H are all atoms ã Molecules → combination of 2 or more atoms, which are either the same or different ã NaCl, H 2 O are all molecules ã Element → can’t be broken down into simpler substances. Atoms or molecules that are made up of one or more identical atoms ã Xe, O 2 are all elements ã Compounds → canbe broken down into simpler substances called elements. ã CaCO 3, NaCl, CO 2 , CaCO 3 , NaNO 2  Properties ã Def: a distinctive trait that describes an object or substance ã Two types of properties  – Physical ã Can be detected by the 5 senses  – Colour, shape, taste, odour ã Can bemeasurable  – Height, weight, diameter  – Chemical ã How something reacts when put in contact with something else  Characteristic vsNon-Characteristic Properties CharacteristicNon-Characteristic Specific for only one object ã Boiling point ã Melting point ã Density ã **Reaction to lime water ã **Reaction to a flame** = only for gasesProperty which more than one objectshare in common ã Colour ã State at room temperature


Sep 22, 2019
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