## Search found 20 matches

Sat Jan 25, 2020 9:01 pm
Forum: Phase Changes & Related Calculations
Topic: State Function
Replies: 7
Views: 53

### State Function

Why is enthalpy a state function?
Sat Jan 25, 2020 8:55 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard enthalpy
Replies: 2
Views: 21

### Standard enthalpy

Why is the standard enthalpy in the most stable form zero?
Sat Jan 25, 2020 8:47 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Bond Enthalpies and gas phases
Replies: 2
Views: 25

### Bond Enthalpies and gas phases

Why are bond enthalpies only limited to gas phases?
Sat Jan 25, 2020 8:37 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Spontaneous Question
Replies: 3
Views: 39

### Re: Spontaneous Question

they are indicated by a negative change in Gibbs free energy
Sat Jan 25, 2020 8:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ideal Gas QUestions
Replies: 8
Views: 68

### Re: Ideal Gas QUestions

yes
Wed Jan 22, 2020 4:02 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy of vaporization
Replies: 2
Views: 34

### Enthalpy of vaporization

What causes vaporization to have such a large enthalpy?
Wed Jan 22, 2020 3:59 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy and Pressure
Replies: 4
Views: 49

### Enthalpy and Pressure

Why does enthalpy have to be at a constant pressure?
Wed Jan 22, 2020 3:58 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy of Glucose
Replies: 2
Views: 62

### Enthalpy of Glucose

Does glucose have a large enthalpy since it is a major energy giving carb?
Wed Jan 22, 2020 3:54 pm
Forum: Phase Changes & Related Calculations
Topic: Temp in sublimation
Replies: 2
Views: 34

### Temp in sublimation

Why is the temperature constant even though heat is added?
Wed Jan 22, 2020 3:53 pm
Forum: Phase Changes & Related Calculations
Topic: Phase changes: endothermic vs exothermic
Replies: 12
Views: 153

### Phase changes: endothermic vs exothermic

Would the reverse reactions of vaporization, melting, and sublimation be exothermic?
Thu Jan 16, 2020 5:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kb and pKb
Replies: 2
Views: 36

### Kb and pKb

How do Kb and pKb relate to each other and basicity? Are they indirectly proportional and pKb directly proportional to basicity? So as pKb increases, it's more basic?
Thu Jan 16, 2020 5:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Autoprotolysis
Replies: 1
Views: 17

### Autoprotolysis

Can autoprotolysis only occur with water? Or is it just most common with water?
Thu Jan 16, 2020 5:22 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Change
Replies: 9
Views: 173

### Re: Temperature Change

Also, why is the reactant formation favored when a reaction is exothermic?
Thu Jan 16, 2020 5:21 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Temperature Change
Replies: 9
Views: 173

### Temperature Change

Why is the product rather than the reactant favored when a reaction is endothermic/ requires heat?
Thu Jan 16, 2020 5:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid/ Base Ionization
Replies: 2
Views: 38

### Acid/ Base Ionization

Why do strong acids and bases completely ionize?
Thu Jan 09, 2020 5:07 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K = 1
Replies: 2
Views: 19

### K = 1

What two different compounds have the same or almost the same stability for K to equal 1?
Thu Jan 09, 2020 5:06 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Q
Replies: 2
Views: 43

### Q

Why is Q used to determine the direction of a reaction?
Thu Jan 09, 2020 5:02 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Dynamic equilibrium
Replies: 2
Views: 32

### Dynamic equilibrium

What causes the forward and reverse reactions continue at equal rates at equilibrium? If the rates of both reactions are equal, why doesn't it just stop?
Thu Jan 09, 2020 4:58 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K pressure units
Replies: 3
Views: 28

### K pressure units

Since K is unitless, does it matter if the partial pressure values used were bar, atm or another unit to begin with?
Thu Jan 09, 2020 4:54 pm
Forum: Ideal Gases
Topic: K based on phases
Replies: 4
Views: 42

### K based on phases

Why can you only find the equilibrium constant for reactants and products in the same phase? For example, for K, why can't you include values of compounds in the gas phase and solid phase but just one or the other?