Chemical Changes/Reactions

• Physical property - Characteristics of a item, no change in chemical.
• Clarity - Transparent(all light), Translucent(Part Light), Opaque(No light)
• Examples of Physical Property - Lustre, Clarity, Brittleness, Hardness, Malleability, Ductility, Conductivity, Taste, Smell, Colour, state, solubility, texture
• Chemical Property - A property determined when the the substance is being changed.
• Examples of Chemical Property - Flammability, toxicity, acidity, reactivity, heat of combustion
• Chemical Change - A change occurs when two or more substances react to make a NEW SUBSTANCE
• Physical Change - Chopping onions, no new substance
• Bonds are atoms playing tug of war, they do not completely lose their valence shells.
• Salts = Any metal and any non-metal
• Covalent Bonds - Non-metal + Non-metal
• Covalent Molecules - Non conductive, sharing electron, non-soluble, low boiling point
• In covalent bonds, lines represent two electrons