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AY is not teaching this course in 2022-
AY is not teaching this course in 2022-
NOT UPDATED FOR 2022
NOT UPDATED FOR 2022
Chemical Reactions:
Chemical Reactions:
This internal is worth 4 credits and will be due on the last Friday of Term 3 (1st October).
This internal will cover 4 different reactions: combination, decomposition, displacement and exchange. You will need to recall how to write word equations, do swap and drop, and balance chemical equations from the from earlier on in the term.
Combination Reactions:
Combination Reactions:
Definition: When two reactants combine to form one product.
General rule: A + B→ AB
Explaining the science:
A combination reaction occurs because there is a rearrangement of atoms.
One atom loses electrons to get a positive charge.
One atom gains electrons to get a negative charge
The positive charge is attracted to negative charge to form a new ionic compound.
Magnesium and OxygenAnswers: Magnesium and OxygenDecomposition reaction:
Decomposition reaction:
Definition: When one substance breaks down to form two or more new substances.
General Rule: ABC→ AB+C
Explaining the science:
A reaction occurred because there was a rearrangement of atoms.
Heat is used to break the bonds of the larger compound into less complex compound.
This causes a small molecule to be released.
You can tell gas has been released due to the change in mass.
Heating Calcium CarbonateAnswers: Heating Calcium CarbonateDisplacement Reaction:
Displacement Reaction:
Definition: When one more reactive metal swaps with a less reactive metal in a salt to make a new salt.
General Rule: A + CB→ AB + C
Explaining the science:
A reaction occurred because there was a rearrangement of atoms.
The more reactive metal solid will lose electrons and become a metal ion.
The less reactive metal ion will gain the electron(s) to become a metal atom.
We know what is more reactive due to the Reactivity series of metals, which you will be given.
Metals ExperimentAnswers: Metals ExperimentExchange Reaction:
Exchange Reaction:
Definition: When two metal ions swap salts.
General Rule: AB + CD→ CB + AD
Explaining the science:
A reaction occurred because there was a rearrangement of atoms.
If one of the salts is insoluble (does not dissolve in water) a precipitate is formed.
A precipitate is a solid that is made from two liquids.
We know what is insoluble or soluble by following the six solubility rules, which you will be given.
Mixing Sodium Hydroxide with Copper NitrateAnswers: Sodium Hydroxide with Copper NitrateYou will then need to write out a what you know about each of the 4 main reactions: Combination, Decomposition, Displacement and Exchange.
For each of these reactions you will need to cover:
Definition of the reaction
General Rule
Example word equation
Balanced symbol equation
Explain the scientific processes happening
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