chem paper 1

• •Element–all matter is made of atomsall the atoms of a particular element are identical to each other
• Molecules are atoms joined together

  They can be the same type of atom e.g. Hydrogen gas (H2) is a molecule and an element.
• Compounds are formed when different atoms join together to form molecules
• •The different substances in mixtures are usually easily separated from one another.
• •Different methods for different substances–Chromatography: separates dissolved substances–Filtration: separates insoluble solids–Evaporation: separates a soluble solid–Simple distillation: separates a liquid from a solution–Fractional distillation: separates two or more liquids
• •Elements - all particles are the same
• •A mixture contains at least two different elements or compounds that have not reacted with each other
• •Compounds – made up of different types of particle
• •Atoms – smallest part of an element that still has its properties
• Compound - Two or more different atoms CHEMICALLY bonded together
• •Some compounds are small and only have a few atoms – MONOMERS
• •Some compounds are made of long chains of atoms joined together – POLYMERS
• Mixture - Made from different substances that are not chemically joined
• Nucleus  

  •in the middle

  •contains protons and neutrons

  •positively chargedmost mass concentrated here