Compounds

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

Reactants are the starting materials used in the experimant 

The products are what are made in the reaction 

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

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

• 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 

acid + metal --> salt + hydrogen 

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 

Method - put a lit splint into hydrogen gas

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

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.

acid + alkali --> salt + water

this is known as neutralisation 

metal oxide + acid --> salt + water

acid + metal carbonate --> salt + water + 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