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10
×
What phrase describes the energy required to start a chemical reaction by breaking bonds in the reactants?
Activation energy
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15
×
What is the trend in ionisation energy down a group? Explain why.
It decreases - because of the shielding effect which reduce the attraction between the nucleus and the outer electrons.
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10
×
What is the weakest intermolecular force?
London dispersion forces
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heart
Other team wins 25 points!
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magnet
Take 20 points!
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gift
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thief
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15
×
What is a free radical?
Highly reactive atoms or molecules with unpaired electrons.
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boom
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gold
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gift
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thief
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25
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seesaw
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shark
Other team loses 15 points!
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fairy
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25
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banana
Go to last place!
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15
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Its chemical formula is C5H8, and is the basis of all terpenes. What is the name is this molecule?
Isoprene (2-methylbuta-1,3-diene)
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15
×
Explain why oils have lower melting and boiling points than fats.
More double bonds, resulting in "kinks" in the molecules, leading to them packing less tightly together, leading to weaker LDFs.
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heart
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seesaw
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gift
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baam
Lose 20 points!
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10
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What functional group is present in aldehydes and ketones?
Carbonyl group
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10
×
What name is given to this type of reaction?
Hydration
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10
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Name the ester formed when propanol reacts with pentanoic acid.
Propyl pentanoate
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15
×
What process could I use to separate different gases in a mixture?
Distillation
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15
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Explain why the melting points of halogens increase as you go down the group.
More electrons = more london dispersion forces = more energy needed to break these forces = higher melting point.
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15
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Whose "law" is defined as the total enthalpy change of a reaction is the same regardless of the route taken?
Hess's Law
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