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In Organic Mistakes On Question Papers > Enthalpy And Entropy > Flashcards

Enthalpy And Entropy Flashcards

1
Q

Is lattice enthalpy positive or negative

A

Negative

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2
Q

What is the layout of a born haber cycle

A

Charged gaseous ions
Gaseous atoms
Elements in standard states
Ionic lattice

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3
Q

What is 🔼atH

A

The enthalpy change when one mole of gaseous atoms are formed from the element in standard state and conditions

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4
Q

What is 🔼EAH

A

He enthalpy change when one mole of gaseous atoms each gain an electron to form one mole of gaseous -1 ions

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5
Q

Is a more negative lattice stronger

A

Yes

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6
Q

Is the first electron affinity negative

A

Yes

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7
Q

Is the second electron affinity negative

A

No

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8
Q

What is 🔼solH

A

The enthalpy change when one mole of solute dissolves in a solvent

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9
Q

What is the 🔼hyd H

A

The enthalpy change when one mole of gaseous ions become dissolved Into water to form one mole of aqueous ions

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10
Q

Dissolving process diagram

A

Gaseous ions

                            Hydration

                             Aqueous ions

                              Dissolving

Ionic lattice Up

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11
Q

What are the properties of ionic compounds

A

High melting point
Soluble in polar solvents
Conduct electricity when aqueous or molten

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12
Q

Factors affecting lattice enthalpy

A

Ionic size

Ionic charges

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13
Q

Factors affecting hydration

A 
Ionic radius (the larger the less negative, attraction between ion and water decreases)
Ionic charge (as increases more negative as attraction between water and ion increases)
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14
Q

When will an ion dissolve

A

If the sum of the hydration enthalpies is greater the enthalpy charge of the solution

No depends on temperature and entropy

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15
Q

What are the units for energy

A

J K-1 mol-1

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16
Q

What have the smallest enthalpies

A

Solid

17
Q

If a system becomes more disordered what type of change will there be

A

Positive

18
Q

What is the unit for standard entropies

A

J K-1 Mol-1

19
Q

Calculating entropy changes

A

🔼s products = s products-s reactants

20
Q

What is Gibbs free energy equation

A

🔼G= 🔼H-T🔼S

21
Q

What must 🔼G be to be feasible

A

<0

22
Q

What does T equal

A

🔼H/🔼S

23
Q

🔼H 🔼S T 🔼G

Negative Positive Low/high ?

A

Negative

24
Q

🔼H 🔼S T 🔼G

Positive Negative Low/high ?

A

Positive

25
Q

🔼H 🔼S T 🔼G

a) . Negative. Negative. Low.
b) . Negative. Negative. High

A

Negative

Positive

26
Q

🔼H 🔼S T 🔼G

a) . Positive. Positive. Low
b) . Positive. Positive. High

A

Positive

Negative

27
Q

Problems with feasibility

A

Doesn’t take into account activation energy

Standard conditions

In Organic Mistakes On Question Papers (17 decks)

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