Physical and Chemical Changes

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Presentation transcript:

Physical and Chemical Changes

Physical Changes The appearance of a substance may have changed BUT the bonds holding the atoms together in molecules and ions have not been broken and NO new bonds have been made.

Examples of Physical Changes All changes in state Dissolving Cutting Mixing Note: Physical changes “tend” to be easy to reverse You Tube Changes in State video Youtube Dissolving video

Chemical Changes Produces new substances with new properties (may or may not be noticeable)...NEW matter! New bonds are formed while others are broken

Chemical Changes Chemical equations can be written for all chemical changes. For example the rusting of iron: 4Fe + 3O2 = 2Fe2O3 (Start with Reactants) (Produce Products)

Examples of Chemical Change Rusting Burning, combustion Fruit ripening Youtube Tomato decomposition video

Evidence of a Chemical Change Heat, light or sound is produced or consumed Gas bubbles are formed A precipitate is formed Colour change occurs Difficult to reverse Youtube Exothermic Reaction video Youtube Exothermic Reaction video 2 Youtube Gas (CO2) Bubble formation video Youtube Yellow precipitate formation video Youtube Colour Change Reactions Video Youtube Oscillating Iodine Clock Reaction