Chemical Reactions Learning Objective: Say whether a change is chemical reaction. State that there...
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Chemical Reactions Learning Objective: •Say whether a change is chemical reaction. •State that there are different types of chemical reaction and give an example.
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Transcript of Chemical Reactions Learning Objective: Say whether a change is chemical reaction. State that there...
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 ReactionsHow 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:
FUEL OXYGEN CARBON DIOXIDE
WATER+ +
FUEL OXYGEN CARBON MONOXID
E
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)
SodiumCarbonate
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 Chlorid
e
+
Acid Alkali Salt+
• 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!
