## Search found 22 matches

Wed Feb 05, 2020 11:54 pm
Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
Topic: Constant pressure
Replies: 19
Views: 190

### Re: Constant pressure

yes, we are referring to constant external pressure
Wed Feb 05, 2020 8:29 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: isolated system
Replies: 8
Views: 113

### Re: isolated system

A reaction in a bomb calorimeter considered an isolated system because a bomb calorimeter is sealed tightly. Therefore, heat cannot be transferred. Teh volume of the system is not changed therefore it is an isolated system.
Wed Feb 05, 2020 8:14 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: higher entropies
Replies: 6
Views: 363

### Re: higher entropies

higher entropy means a higher disorder, which means gas is high. This also means low energy.
Wed Feb 05, 2020 8:09 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: q and w
Replies: 10
Views: 119

### Re: q and w

I don't know exactly what the tricks are to determine when it comes to being able to tell if the q or w will be positive or negative but, q will be positive if heat is being added and negative if it is being removed. w would be positive if work is being done by the system and negative if work is done.
Wed Feb 05, 2020 7:57 pm
Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
Topic: Big Midterm Review
Replies: 4
Views: 75

### Re: Big Midterm Review

I am still confused so when and where is the midterm?
Wed Feb 05, 2020 7:54 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Molar Heat Capacity
Replies: 4
Views: 39

### Re: Molar Heat Capacity

In order to find the molar heat capacity you would have to multiply the moles by a constant pressure or volume, then you would multiply this by the temperature.
Thu Jan 30, 2020 10:27 pm
Forum: Phase Changes & Related Calculations
Topic: Enthalpy of sublimation?
Replies: 8
Views: 66

### Re: Enthalpy of sublimation?

Ethalpy of sublimation is positive because it requires heat and therefore it would be endothermic. Also it is important to remember that phase changes are constant T.
Thu Jan 30, 2020 10:23 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Constant Pressure
Replies: 7
Views: 71

### Re: Constant Pressure

When the question is being asked will it say constant pressure or constant volume? How will we know what and what should we look for?
Thu Jan 30, 2020 10:19 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Celcius and Kelvin
Replies: 11
Views: 89

### Re: Celcius and Kelvin

The TA I think said something about when we are dealing with delta T we can use Kelvin and Celcius.
Thu Jan 30, 2020 10:17 pm
Forum: Phase Changes & Related Calculations
Topic: Cv and Cp
Replies: 9
Views: 93

### Re: Cv and Cp

So solids and liquids only use C? Also for gases it depends on certain factors?
Thu Jan 30, 2020 10:10 pm
Forum: Phase Changes & Related Calculations
Topic: standard reaction enthalpy vs. standard enthalpy of formation
Replies: 7
Views: 213

### Re: standard reaction enthalpy vs. standard enthalpy of formation

How will we know when to use standard reaction ethalpy or standard ethalpy of formation? Will the question specifically ask for it?
Sun Jan 26, 2020 9:23 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: exothermic reactions
Replies: 19
Views: 200

### Re: exothermic reactions

Exothermic reactions release heat causing the pressure to increase.
Sun Jan 26, 2020 9:21 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: endothermic
Replies: 8
Views: 48

### Re: endothermic

The temperature would increase if it was an endothermic reaction.
Sun Jan 26, 2020 9:20 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Using Kc Vs Kp
Replies: 18
Views: 203

### Re: Using Kc Vs Kp

When trying to find Kc or Kp you would use the same equation of product over reactants just like finding Q?
Sun Jan 26, 2020 9:18 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kp to Kc
Replies: 11
Views: 82

### Re: Kp to Kc

yes, as long as H20 is not in pure liquid form.
Sun Jan 26, 2020 9:16 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Percent Ionization
Replies: 12
Views: 74

### Re: Percent Ionization

To find the percent ionization...you have to divide acid or base by inital concentration of the acid or base.
Mon Jan 20, 2020 7:10 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Favoring
Replies: 4
Views: 240

### Re: Equilibrium Favoring

So when we solve to find the chemical equilibrium....we have to balance the equation first then solve for k before determining if it shifts to the right or left.
Sun Jan 12, 2020 5:51 pm
Forum: Ideal Gases
Topic: Test 1
Replies: 7
Views: 89

### Re: Test 1

I would definitely read the chapters. Also do as many of the homework problems as you can because that is always good practice. Dr. Lavelle also mentioned some of those will be on the test.
Sun Jan 12, 2020 5:46 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Situations in which Q=K
Replies: 7
Views: 63

### Re: Situations in which Q=K

Pretty much if Q is equal to K that is how you know the equation is at equilibrium.
Sun Jan 12, 2020 5:44 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Significance of principle
Replies: 6
Views: 52

### Re: Significance of principle

The Le Chatelier's Principle is responsible for describing which way a chemical reaction shifts due to its conditions. Specifically the changes involving temperature, pressure and the concentration of both products and reactants. Primarilly, this principle shows a change.
Sun Jan 12, 2020 5:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: When to Use Ice Tables?
Replies: 3
Views: 47

### Re: When to Use Ice Tables?

A key component to look out for when it comes to knowing when to use Ice Tables is if you are given values as well as values of equilibrium. Not to mention if they are asking to calculate for K. Hope this helps!!
Sun Jan 12, 2020 5:31 pm
Forum: Ideal Gases
Topic: PV = nRT
Replies: 16
Views: 163

### Re: PV = nRT

P: Pressure
V: volume in liters
n: number of moles
R: Ideal gas constant
T: Temperature in Kelvin