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Chemical reactions

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