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Chemical Reactions MB
 

Chemical Reactions MB

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By Michaela Barber

By Michaela Barber

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    Chemical Reactions MB Chemical Reactions MB Presentation Transcript

    • Chemistry
    • elements
      An element is a pure substance consisting of only one type of atom.
      It is distinguished by it’s atomic number, or the number of protons in it’s nucleus.
    • atoms
      An atom is a basic unit of matter. Also it is the smallest recognized division of a chemical element.
    • metals
      A metal is a chemical element, compound or alloy, characterised by high electrical and heat conductivity. It’s also ductile (it can be stretched without breaking) and tensile (it can be bent without breaking).
    • non-metals
      A non-metals (such as hydrogen & carbon) are poor conductors of heat & electricity, and are dull and brittle in solid form. The usually have lower densities, freezing points and boiling points than metals.
    • the periodic table
      The periodic table is a display of all the pure chemical elements. The current standard table contains 117 elements.
    • compounds
      A compound is two or more different elements fused together. Some examples are aluminium, baking soda and tin.
    • chemical reactions
      A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Examples are a plant changing sunlight into energy or metal going rusty.
    • identification
      You can tell if there is a chemical reaction happening because either heat, light, precipitate or gas will be produced.
    • Chemical changes
      A chemical changes is when the bonds of an object are broken and new bonds are formed, creating a new substance (e.g. cooking, corn kernals into popcorn).
    • physical changes
      In a physical change, the substance doesn’t change chemically at all, but takes on a different form (e.g. water freezing and melting)
    • reaction rate
      A reaction rate is the rate that two substances combine to form a chemical reaction. For example, iron rusting is a slow reaction rate. Fire burning a log into charcoal is a fast reaction rate.
    • Factors of reaction rate
      . Concentration – how diluted or pure the substance is.
      . Temperature – how hot/cold the environment is.
      . Catalyst – whether or not there is another substance to provide a pathway.
      . Surface area – powder is going to dissolve faster than a tablet.