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Chemistry Unit 1 > Chemistry Unit 1 > Flashcards

Chemistry Unit 1 Flashcards

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1
Q

What is lattice enthalpy?

A

The enthalpy change when one mole of an ionic compound is converted to gaseous ions.

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2
Q

What is entropy?

A

The measure of disorder

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3
Q

What is an asymmetric centre?

A

A carbon with four different atoms or groups attached.

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4
Q

What does optically active mean?

A

It rotates a plane of plane polarised light.

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5
Q

Why would a molecule have more than one pKa value?

A

It has more than one -COOH group

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6
Q

What is meant by the term hydrogenation?

A

Addition of a hydrogen molecule across C=C

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7
Q

Name a catalyst used in the hardening of unsaturated fatty acids.

A

Nickel

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8
Q

How do you “quench” a solution

A

Add excess water

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9
Q

Define lattice enthalpy

A

The enthalpy required to convert 1 mole of ionic solid into gaseous ions

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10
Q

What is the standard enthalpy of solution?

A

The enthalpy change when 1 mole of a solute dissolves in water

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11
Q

Define standard enthalpy of hydration

A

The enthalpy change when 1 mole of gaseous ions converted into 1 mole of aqueous ions.

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12
Q

What is the equation for lattice enthalpy?

A

ΔHsol = ΔHlatt + ΔHhyd

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13
Q

How do you find enthalpy of formation?

A

ΔH = Σ products - Σ reactants

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14
Q

How do you find enthalpy of combustion?

A

ΔH = Σ Reactants - Σ Products

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15
Q

How do you find bond enthalpy?

A

ΔH = Σ bonds broken - Σ bonds formed

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16
Q

How do you find entropy?

A

ΔS = Σ Products - Σ Reactants

17
Q

How do you find free energy (ΔG)?

A

ΔG = ΔH - TΔS

18
Q

Define Brønsted-Lowry acid

A

Proton donors

19
Q

Define Brønsted-Lowry base

A

Proton acceptor

20
Q

Define monobasic acid

A

An acid that releases one H+ ion per molecule.

21
Q

Define dibasic acid

A

An acid that releases two
H+ ions per molecule

22
Q

Equation of strong acids

A

[H+] = [HA]

23
Q

Equation of alkalis

A

[H+]= Kw / [OH-]

24
Q

What are optical isomers

A

Molecules which exist as non-superimposable mirror images

25
Q

What is Kw equal to?

A

[OH][H]

26
Q

What is transesterfication?

A

A reaction where the alkyl group of an ester is exchanged for the alkyl groups of an alcohol.

Chemistry Unit 1 (1 decks)

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