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Chemistry (Chemical tests (In a chemical experiment a new substance is…

- - - - In a written equation it would look like this: reactant A + reactant B => product C + product D
        
        If a reaction is reversible it can look like this: A + B <=> C + D
        
        The test for hydrogen is simple. Gather your gas in a test tube and put a lighted splint into it. Then listen for a popping sound as the oxygen and hydrogen react.
  - - - carbonate + acid => carbon dioxide + salt + water
- - - - Each element is made up of atoms. These contain protons and neutrons as well as electrons on the outside.
      - When you mix elements nothing happens. No reactions will take place, chemical or physical
        
        Energy is required for a reaction. Most often this energy comes in the form of heat.
        
        No atoms can be lost or created in a reaction,m only there form will be changed
        
        Decomposition, neutralisation and precipitation.
  - - - Alkali metals
      - Halogens
      - Alkali earth metals
- - - - You can change a materials state by either changing the temperature or applying more or less pressure.