CHEMICAL REACTIONS
New Topic

In a chemical reaction the substances on the left of the arrow are the reactants and on
the right are the products.
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Hydrogen + Oxygen -> Water
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Reactants react together and Products are produced after the reaction
REACTANTS AND PRODUCTS
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In a chemical reaction nothing is created or destroyed. The atoms are simply
rearranged
LAW OF CONSERVATION OF MASS
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Sodium + water -> sodium hydroxide + hydrogen
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A word equation summarises the equation
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Reactants _________________

Products __________________
A WORD EQUATION
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2Na + 2H2o -> 2NaOH + H2
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This tells formulas of all the substances involved and the ratio in which they react
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Nothing has been created or destroyed, only the atoms have been re-arranged
A CHEMICAL EQUATION
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Reacting Hydrogen and Oxygen
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1) write out the word equation

Hydrogen + Oxygen -> Water
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2) write the simplified chemical equation
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H2 + O2 -> H2O
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3) we need the same number of atoms on each side of the arrow
WRITING CHEMICAL EQUATIONS
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Types of atom –

Number of atom –
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Balancing it
BALANCING THE EQUATION
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Question 5 – page 159
COMPLETE