Enthalpy And Entropy

Question 1

Is lattice enthalpy positive or negative

Answer 1

Negative

Question 2

What is the layout of a born haber cycle

Answer 2

Charged gaseous ions
Gaseous atoms
Elements in standard states
Ionic lattice

Question 3

What is 🔼atH

Answer 3

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

Question 4

What is 🔼EAH

Answer 4

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

Question 5

Is a more negative lattice stronger

Answer 5

Yes

Question 6

Is the first electron affinity negative

Answer 6

Yes

Question 7

Is the second electron affinity negative

Answer 7

No

Question 8

What is 🔼solH

Answer 8

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

Question 9

What is the 🔼hyd H

Answer 9

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

Question 10

Dissolving process diagram

Answer 10

Gaseous ions

                            Hydration

                             Aqueous ions

                              Dissolving

Ionic lattice Up

Question 11

What are the properties of ionic compounds

Answer 11

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

Question 12

Factors affecting lattice enthalpy

Answer 12

Ionic size

Ionic charges

Question 13

Factors affecting hydration

Answer 13

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)

Question 14

When will an ion dissolve

Answer 14

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

No depends on temperature and entropy

Question 15

What are the units for energy

Answer 15

J K-1 mol-1

Question 16

What have the smallest enthalpies

Answer 16

Solid

Question 17

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

Answer 17

Positive

Question 18

What is the unit for standard entropies

Answer 18

J K-1 Mol-1

Question 19

Calculating entropy changes

Answer 19

🔼s products = s products-s reactants

Question 20

What is Gibbs free energy equation

Answer 20

🔼G= 🔼H-T🔼S

Question 21

What must 🔼G be to be feasible

Answer 21

<0

Question 22

What does T equal

Answer 22

🔼H/🔼S

Question 23

🔼H 🔼S T 🔼G

Negative Positive Low/high ?

Answer 23

Negative

Question 24

🔼H 🔼S T 🔼G

Positive Negative Low/high ?

Answer 24

Positive

Question 25

🔼H 🔼S T 🔼G

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

Answer 25

Negative

Positive

Question 26

🔼H 🔼S T 🔼G

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

Answer 26

Positive

Negative

Question 27

Problems with feasibility

Answer 27

Doesn’t take into account activation energy

Standard conditions