CHEMICAL REACTIONS Year Science One or more substances are changed into a new substance You will know a chemical reaction would have taken places are.

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Presentation transcript:

CHEMICAL REACTIONS Year Science One or more substances are changed into a new substance You will know a chemical reaction would have taken places are there is a change- grow, burn, decay. (See a colour change, a gas being produced or precipitation has occurred).

REACTANTS- Substances you start with that go into a reaction EG. Magnesium PRODUCTS- The new substance as a result of a chemical reaction The new substance(s) that are formed from the reaction Reactants Product N 2 + H 4 N 2 H 4

SYNTHESIS/COMBUSTION- 2 OR MORE ELEMENTS COMBINDED MAKES SOMETHING NEW Magnesium + Oxygen Magnesium Oxide Element + Element Compound A + B Produce AB

DECOMPOSITION- BREAKS DOWN A COMPOUND INTO TWO SUBSTANCES Copper Carbonate Copper oxide + Carbon dioxide Compound Element (gas) + Element (gas) AB A + B

SINGLE DISPLACEMENT REACTION- ONE ELEMENT TAKES THE PLACE OF ANOTHER ELEMENT IN A COMPOUND – THEY TRADE PLACES Hydrochloric acid + Aluminium Aluminium chloride + Hydrogen Compound + Element Compound + Element C + AB AC + B

DOUBLE DISPLACEMENT REACTION- REACTION IN WHICH A GAS, A SOLID PRECIPITATES, FROM THE EXCHANGE OF ATOMS. Potassium Iodide + Lead nitrate Potassium Nitrate + Lead Iodide Compound + Compound Compound + Compound AB + CDCB + AD

CLASSIFYING CHEMICAL REACTIONS FLINTSTONES  biRwAVTV8 biRwAVTV8 This Video explains these different variety of chemical reactions.

INCREASING CHEMICAL REACTION RATES How to speed up chemical reactions – Begin by watching this video. It explains the practical speed of water molecules from revision guide.