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A Level Chem > AS > Flashcards

AS Flashcards

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1
Q

Why don’t u use universal indicator for a titration

A

Change is too gradual

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2
Q

Indicators used in titrations

A

Methyl orange

Phenolphthalein

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3
Q

Colour change phenolphthalein acid- alkali

A

Pink - colourless

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4
Q

Colour change methyl orange acid- alkali

A

Yellow-red

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5
Q

1st ionisation energy

A

Energy required to remove one electron from each atom in 1 mole of gaseous atoms

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6
Q

2nd ionisation energy

A

Energy required to remove second electron

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7
Q

Metals are hard and have high melting points because

A

Strong attraction between lattice and delocalised electrons . Lots of energy to break

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8
Q

Metals are malleable because

A

Ions are in layers which slide over each other. Electrons maintain attraction

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9
Q

Electron deficient

A

Atoms in a molecule which has too few electrons

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10
Q

Electron rich

A

Atom from 3rd row with an expanded octet (up to 18) because they have too many electrons

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11
Q

Dative covalent

A

All bonding pair of electrons is donated by one atom

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12
Q

Electronegativity

A

The power of an atom to attract the electrons in a covalent bond

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13
Q

Allotropes

A

Different forms of the same element in the same form

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14
Q

Allotropes of carbon

A

Diamond
Graphite
Graphene

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15
Q

Standard enthalpy change of a reaction

A

Enthalpy change when the reaction occurs in the molar quantities shown in the chemical equation under standard conditions

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16
Q

Standard enthalpy change of formation

A

Enthalpy change when 1 mole of a compound of formed from its elements in their standard stated under standard conditions

17
Q

Standard enthalpy change of combustion

A

Enthalpy change when 1 mole of a substance is completely burned in oxygen

18
Q

Standard enthalpy change of neutralisation

A

The enthalpy change when an acid and alkali react together under standard conditions to form 1 mole of water

19
Q

Oxidising alcohols
Primary
Secondary
Tertiary

A

Primary- aldehydes then carboxylic acids
Secondary - ketones
Tertiary- cannot be oxidised

A Level Chem (17 decks)

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