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Chemistry OCR A > Periodicity > Flashcards

Periodicity Flashcards

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1
Q

What do periods show

A

Number of the highest energy electron shell in an elements atom
Trend=periodicity

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2
Q

Ionisation energy

A

The energy required to remove one electron from each atom of an element in one mole of gaseous atoms to form one mole of gaseous 1+ ions

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3
Q

Factors affecting ionisation energy

A

Atomic radius nuclear charge and electron shielding

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4
Q

Second ionisation energy

A

The energy required to remove one electron from each atom in one mole of gassiest 1+ ions of an element to form one mole of gassiest 2+ ions

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5
Q

Trends of successive ionisation energy

A

Always endo BENDO

Increase as more +ve nucleus

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6
Q

Ionisation energy down a group

A

Atomic radius increases electron shielding increases nuclear attraction decreases first ionisation energy decreases

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7
Q

Ionisation energy trends across a period

A

Atomic radius Decreases atomic charge increases electron shielding is the same ionisation energy increases

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8
Q

Metallic bonding

A

The strong electrostatic attraction between cations and delocalised electrons

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9
Q

Properties of metals

A

Strong metallic bones hi electrical conductivity and high melting and boiling points

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10
Q

Solubility of metals

A

Ionic bonds too strong to dissolve any interaction will lead to a reaction

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11
Q

Which elements form giant covalent structures

A

Boron carbon silicon

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12
Q

Solubility of group 2 metals

A

Increases down group- get more alkaline

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13
Q

Trend of boiling point of halogens

A

Increases down group as more electrons means stronger London forces and more energy required to break intermolecular forces

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14
Q

Iodine colour in cyclohexane

A

Violet

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15
Q

Reactivity of halides

A

Decreases down the group

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16
Q

Trending reactivity of halogens

A

Down the group atomic radius increases shielding increases less nuclear attraction reactivity decreases

17
Q

Disproportionation reaction

A

A redox reaction where the same species is both oxidised and reduced

18
Q

Activation energy

A

The energy input required to break bones activation energy is the minimum energy required her reaction to take place

19
Q

Enthalpy change of reaction

A

The Enthalpy Change that accompanies a reaction in the mole a quantity shown in a chemical equation under standard conditions with all reactants and products in their standard states

20
Q

Enthalpy Change of formation

A

The entropy change that takes place when one mole of a compound is formed from its elements under standard conditions with all reactants and products in their standard states

21
Q

Enthalpy Change of combustion

A

Enthalpy Change that takes place when one mole of a substance reacts completely with oxygen under standard conditions with all reactants and products in their standard states

22
Q

Enthalpy Change of neutralisation

A

Enthalpy Change that accompanies the reaction of an acid by a base to form one mole of H2O under standard conditions with all reactants and products in the standard state

Always the same

23
Q

Specific heat capacity

A

The energy required to raise the temperature of 1 g of a substance by one Kelvin

24
Q

Issues with accuracy of calculating enthalpy change of combustion

A

He lost his surroundings incomplete Combustion evaporation of methanol from the wick non-standard conditions

25
Q

Average bond enthalpy

A

The energy required to break one mole of a specified type of bond in a gaseous molecule
BENDO
Only average. Different environments have different bond enthalpies

26
Q

Rate of reaction

A

Measures how fast are reactant is used up or how fast the product is being formed

27
Q

Collision Theory

A

To reacting particles must collide from reaction to occur

They must collide with correct orientation and have sufficient energy to overcome the activation energy

28
Q

Le Chateliers principle

A

When a System in equilibrium is subjected to an external change this system readjusts itself to minimise the effect of the change

Chemistry OCR A (10 decks)

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