Compounds

Chem exam 

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What is shown in a chemical reaction?

  • Bubbles are produced ( gas ) 
  • Heat ( exothermic / endothermic ) 
  • Colour change
  • a solid is made 
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What is a Reactant?

Reactants are the starting materials used in the experimant 

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What is a Product?

The products are what are made in the reaction 

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Exothermic and Endothermic Reaction

  • An exothermic reaction is a reaction where heat is given out 
  • An Endothermic reaction is a reasion which takes in heat 
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Space Filler Diagram

  • no atoms are created or destroyed just rearranged 
  • new substances are formed
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Forming compounds

  • when compounds are formed, elements are chemically joined together
  • the Metal looses electrons and becomes a positive ion
  • the non-metal gains electrons and becomes a negative ion
  • an ion is an atom with a charge 
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Acid and Metals

acid + metal --> salt + hydrogen 

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Naming Salts

the first name of the salt is always the name of the metal

the surname of the salt depends on the name of the acid 

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Testing for hydrogen

Method - put a lit splint into hydrogen gas

Result - if hydrogen is present, you'd hear a squeaky pop

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*Making a salt

1. Excess metal is added to the dilute acid, this is to make sure that all the acid is       used up. Then gently heat the mixture to speed up the reaction.

2. Filter the mixture using filter paper and a filter funnel, this is to remove the               unreacted metal. ( filtraction )

3. The solution left is then placed in an evaporating basin and placed by a window at room temperature to evaporate. A crystal is formed in the evaporating basin.

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Acid and Alkali

acid + alkali --> salt + water

this is known as neutralisation 

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acid and metal oxide

metal oxide + acid --> salt + water

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acid and metal carbonate

acid + metal carbonate --> salt + water + carbon dioxide

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Testing for Carbon Dioxide

method - Gas is passed through lime water

Result - the limewater goes from a colourless solution to a milky colour if carbon dioxide is present 

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