Chemical Reactions MB

Chemical Reactions MB

• 1.
  Chemistry
• 2.
  elementsAn element isa 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.
• 3.
  atomsAn atom isa basic unit of matter. Also it is the smallest recognized division of a chemical element.
• 4.
  metalsA metal isa 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).
• 5.
  non-metalsA non-metals (suchas 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.
• 6.
  the periodic tableTheperiodic table is a display of all the pure chemical elements. The current standard table contains 117 elements.
• 7.
  compoundsA compound istwo or more different elements fused together. Some examples are aluminium, baking soda and tin.
• 8.
  chemical reactionsA chemicalreaction 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.
• 9.
  identificationYou can tellif there is a chemical reaction happening because either heat, light, precipitate or gas will be produced.
• 10.
  Chemical changesA chemicalchanges 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).
• 11.
  physical changesIn aphysical change, the substance doesn’t change chemically at all, but takes on a different form (e.g. water freezing and melting)
• 12.
  reaction rateA reactionrate 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.
• 13.
  Factors of reactionrate. 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.