## Search found 25 matches

Sun Feb 09, 2020 7:05 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy QUestion
Replies: 2
Views: 40

### Entropy QUestion

In thermodynamics, is entropy described as qualitatively as a measure of energy dispersal at a specific temperature? Is that why it can't reach equilibrium at all?
Sun Feb 09, 2020 7:02 pm
Forum: Concepts & Calculations Using Second Law of Thermodynamics
Topic: Second Law Thermodynamics
Replies: 4
Views: 69

### Second Law Thermodynamics

Just to clarify, the Second law of thermodynamics is an expression of the universal law of increasing entropy, stating that the entropy of an isolated system which is not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium?
Sun Feb 09, 2020 6:40 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: First Law of Themordynamics
Replies: 4
Views: 53

### First Law of Themordynamics

So what's the difference between the Law of Conservation of Energy and First Law of Thermodynamics because both of them seems to have the same definition, "the total amount of energy in the universe is constant, energy cannot be created or destroyed, only transferred or transformed"?
Sun Feb 09, 2020 6:36 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Law of Conservation Energy
Replies: 5
Views: 39

### Law of Conservation Energy

Just to clarify in the Law of conservation Energy, energy cannot be gained or lost, it can only be converted from one form to another?
Sun Feb 09, 2020 6:29 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Thermodynamic system
Replies: 3
Views: 33

### Thermodynamic system

What can be transferred between the system and its surroundings in an open system?
Sun Feb 09, 2020 6:27 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Entropy Question
Replies: 3
Views: 47

### Entropy Question

Any time there is a change in the structural position does entropy also change?
Sun Feb 09, 2020 6:16 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Gibbs Free Energy
Replies: 2
Views: 25

### Gibbs Free Energy

Why is Delta U a state function when Q+ W are both path functions?

How can two-path functions equal a state function?
Thu Feb 06, 2020 11:39 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Entropy V.S Enthalpy QUestion
Replies: 3
Views: 84

### Entropy V.S Enthalpy QUestion

I'm not sure if this always applies, but if enthalpy is negative and the entropy is negative, would that mean both are spontaneous?
If so then would that same question apply if both enthalpy and entropy were positive? Or if one is positive and the other is negative?
Thu Feb 06, 2020 11:36 am
Forum: Work, Gibbs Free Energy, Cell (Redox) Potentials
Topic: Gibbs Free Energy
Replies: 2
Views: 51

### Gibbs Free Energy

Depending on whether it is spontaneous or not, does it all depend on temperature? If so would it be entropy or enthalpy?

I'm assuming it would be entropy but I just wanted to check because I'm not too sure what the difference between the two is.
Thu Feb 06, 2020 11:27 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Specific Heat Capacity
Replies: 3
Views: 52

### Specific Heat Capacity

If Q is the heat transferred of the system, would you determine whether Q is exothermic or endothermic depending on whether the temperature is negative or positive?
Thu Feb 06, 2020 11:20 am
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Thermodynamics
Replies: 6
Views: 86

### Thermodynamics

Just to clarify, when heat is transferred from the system and work done by the system, does it carry a negative sign to show that the energy of the system decreases in both cases? At first, I assumed it would be only the system, but my peers are saying it's both.
Mon Jan 27, 2020 6:41 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid
Replies: 2
Views: 32

### Acid

Which weak acid solution will have a greater buffering capacity: a 1 L solution of 0.02 M HCN or a 0.5 L solution of 0.04 M HCN?
Mon Jan 27, 2020 6:27 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Bases
Replies: 2
Views: 76

### Acid and Bases

Let's begin with the hydroxide of a light, silvery white metal; one that often reminds me of German lye rolls. With a colossal global demand, this basic compound finds vast use in petroleum drilling and in the removal of sulphurous impurities from sub grade crude oil. In solution form, it is employe...
Mon Jan 27, 2020 6:24 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibria
Replies: 4
Views: 34

### Chemical Equilibria

What is meant when a reaction is described as “having reached equilibrium”? What does this statement mean regarding the forward and reverse reaction rates? What does this statement mean regarding the amounts or concentrations of the reactants and the products?
Mon Jan 27, 2020 6:17 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibrium
Replies: 1
Views: 27

### Chemical Equilibrium

Describe how the equilibrium constant for an overall reaction is related to the equilibrium constants for the individual reactions that yield the overall reaction.
Mon Jan 27, 2020 6:13 pm
Forum: Ideal Gases
Topic: Chemical Equilibrium
Replies: 4
Views: 37

### Chemical Equilibrium

What role does a catalyst play in a reversible chemical reaction? How does a catalyst affect the value of the equilibrium constant for a reaction?
Sat Jan 25, 2020 10:55 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Bases
Replies: 1
Views: 39

### Acid and Bases

In a solution prepared by adding 0.100 mole of propionic acid in enough water to make a 1.00 L solution, the pH is found to be 1.35. Calculate the Ka for propionic acid?
Sat Jan 25, 2020 10:41 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: La Chatelier's Principle
Replies: 8
Views: 206

### La Chatelier's Principle

When the concentration of reactant or product is increased, the reaction will proceed in which direction?
Sat Jan 25, 2020 9:03 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Bases
Replies: 4
Views: 33

### Acid and Bases

How do you calculate the pOH of a 0.35 M solution of hydrofluoric Acid, HF, whose ka= 7.1 x 10^-4
Sat Jan 25, 2020 9:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Acid and Bases
Replies: 3
Views: 32

### Acid and Bases

How do you calculate the PH of a 1.50 M solution of H2SO4?
Sat Jan 25, 2020 8:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Energy of the reactants
Replies: 6
Views: 49

### Energy of the reactants

When the energy of the products is greater than the energy of the reactants, what is true about the reaction?
Sat Jan 25, 2020 8:35 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Spontaneous Question
Replies: 3
Views: 44

### Spontaneous Question

What is true of spontaneous reactions when thinking about chemical systems?
Sat Jan 25, 2020 8:25 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Ideal Gas QUestions
Replies: 8
Views: 80

### Ideal Gas QUestions

If the pressure goes up, would that mean the volume would go down?
Sat Jan 25, 2020 8:20 pm
Forum: Ideal Gases
Topic: PV=NRT
Replies: 3
Views: 73

### PV=NRT

What is the average distance between oxygen molecules at STP?
Sat Jan 25, 2020 8:19 pm
Forum: Ideal Gases
Topic: PV=NRT
Replies: 7
Views: 84

### PV=NRT

What is the average distance between oxygen molecules at STP?