Elements & Compounds

• Single atoms are always gasses
• molecules can be solids,liquids and gasses
• Metals conduct electricity
• Non metals do not conduct electricity
• A chemical element is a chemical substance that cannot be broken down into other substances by chemical reactions
• An element is something that only contains one type of atom
• A compound contains two or more substance that are not chemically combined
• A mixture contains two or more substances that are not chemically combined
• a mixture is a combination of substances that can be physically separated
• The elements in a compound are always combined in certain fixed proportions.