Presentation on theme: "Chemical Reactions Learning Objective: Say whether a change is chemical reaction. State that there are different types of chemical reaction and give an."— Presentation transcript:
Chemical Reactions Learning Objective: Say whether a change is chemical reaction. State that there are different types of chemical reaction and give an example.
Lesson Outcomes: 1.To state that chemical reactions can be used to create new substances 2.To state how to identify whether a chemical reaction has taken place 3.To name and describe the five different types of chemical reactions
Chemical Reactions How do we know if a chemical reaction takes place? A gas may be given off The colour may change A precipitate may form A new substance is made
5 types of chemical reactions Combustion Thermal Decomposition Oxidation Neutralisation Displacement
Combustion A chemical reaction that burns FUEL in OXYGEN to RELEASE ENERGY! Lots of oxygen: Not enough oxygen: FUELOXYGEN CARBON DIOXIDE WATER++ FUELOXYGEN CARBON MONOXIDE WATER++ NOW: describe what happened!
Oxidation A chemical reaction that ADDS OXYGEN to a chemical Eg.Rusting Magnesium Oxygen Magnesium Oxide + Iron Oxygen Iron Oxide + Demo today: NOW: describe what happened!
Displacement A LESS REACTIVE chemical is PUSHED OUT of its compound by a MORE REACTIVE one E.g Thermite Iron Oxide Aluminium Iron+Aluminium Oxide + Can you remember another use??
Thermal Decomposition A chemical reaction that BREAKS DOWN A COMPOUND using HEAT! Baking Powder in a cake: Demo today: Sodium Hydrogen Carbonate (A.K.A Baking Powder) Sodium Carbonate Carbon Dioxide + Calcium Carbonate Calcium Oxide Carbon Dioxide + + Water NOW: describe what happened!
Neutralisation A chemical reaction between an ACID and ALKALI Hydrochloric Acid (Stomach acid) Sodium Bicarbonate (Antacid tablet) Sodium Chloride + Acid AlkaliSalt+ E.g Antacid tablets Water + Carbon Dioxide Water+ + (this makes them fizz!) Can you remember another use??
Neutralisation Oxidation Displacement Thermal Decomposition A less reactive chemical is ‘pushed out’ of its compound by a more reactive chemical The reaction between an acid and an alkali The breaking down of a compound using heat The addition of oxygen to a chemical Match up the definitions!