Search found 49 matches

by torialmquist1F
Sat Mar 17, 2018 1:31 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Determining Slow Step
Replies: 2
Views: 833

Determining Slow Step

Is it possible to determine the slow step, rate determining step, of a mechanism from the individual steps? If the slow and fast steps are not explicitly stated, is there a way to figure out which is which? Will we need to do this or will it always be given?
by torialmquist1F
Sat Mar 17, 2018 1:19 pm
Forum: Reaction Mechanisms, Reaction Profiles
Topic: Steady State Approximation Vs Pre Equilibrium
Replies: 2
Views: 303

Steady State Approximation Vs Pre Equilibrium

How do we differentiate whether to use the steady state approximation method versus the pre equilibrium approach to construct the overall rate law from a mechanism?
by torialmquist1F
Sun Mar 11, 2018 10:36 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020103

Re: Post All Chemistry Jokes Here

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."
by torialmquist1F
Sun Mar 11, 2018 10:17 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020103

Re: Post All Chemistry Jokes Here

DRpjHKOXkAEk2z1.jpg
by torialmquist1F
Sun Mar 11, 2018 10:15 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020103

Re: Post All Chemistry Jokes Here

Clever_Chemistry_Joke_funny_meme.jpg
by torialmquist1F
Sun Mar 11, 2018 10:14 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1020103

Re: Post All Chemistry Jokes Here

Don't trust atoms, they make up everything.
by torialmquist1F
Mon Mar 05, 2018 9:36 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Determining overall rate order
Replies: 3
Views: 164

Determining overall rate order

Are only the rate orders of reactants relevant in the overall rate order? Do rate orders of products even exist, or only in the reverse reactions?
by torialmquist1F
Mon Mar 05, 2018 9:33 pm
Forum: Method of Initial Rates (To Determine n and k)
Topic: Example 15.2
Replies: 1
Views: 92

Example 15.2

When given a chart with multiple experiments to decide how initial rate of consumption varies as concentration of reactants changes, does it matter which experimental data/ concentrations to put back into the general rate law once you've found all the reaction orders for the reactants?
by torialmquist1F
Mon Mar 05, 2018 9:28 pm
Forum: Zero Order Reactions
Topic: Zero order integrated rate law
Replies: 1
Views: 106

Zero order integrated rate law

Can someone integrate the rate law for 0 order reactions step by step? Im having trouble visualizing how it gets to [A]o-[A]=kt
by torialmquist1F
Sun Feb 25, 2018 10:41 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Midterm Q3A
Replies: 2
Views: 263

Midterm Q3A

Calculate the heat (kj) that must be supplied to a 1.4 kg iron pot containing 1.2 kg water in order to raise its temperature from 22 degrees celsius to the boiling point of water. Assume no water evaporates. What percentage of the water was used for heating the water? What are the steps for solving ...
by torialmquist1F
Sun Feb 25, 2018 10:29 pm
Forum: Concepts & Calculations Using First Law of Thermodynamics
Topic: Midterm Q5
Replies: 2
Views: 205

Midterm Q5

A system undergoes a two-step process. In step one, it expands adiabatically from 1.00 L to 2.56L against an external pressure of 1.00 atm. In step 2, it releases 73J of heat at 1.00 atm as it returns to the original internal energy. Find the volume of the system.

How do I solve this problem?
by torialmquist1F
Sun Feb 25, 2018 10:26 pm
Forum: Calculating Work of Expansion
Topic: Midterm 4A
Replies: 3
Views: 146

Midterm 4A

A piston containing .10 mol of nitrogen gas at 298k has an initial volume of 2.24 L and undergoes an expansion against .5atm external pressure until its volume doubles. Calculate the work involved in Joules.

Which work equation do we use for this and why?
by torialmquist1F
Sun Feb 18, 2018 7:26 pm
Forum: Balancing Redox Reactions
Topic: Half Reaction
Replies: 3
Views: 147

Re: Half Reaction

I don't think so either because in full reactions there should be no free electrons, but in half reactions the electrons and H+ molecules should be included with the compounds
by torialmquist1F
Sun Feb 18, 2018 7:22 pm
Forum: Balancing Redox Reactions
Topic: Basic conditions
Replies: 3
Views: 153

Re: Basic conditions

If the equation is being balanced in a basic solution, through the addition of one more step, the appropriate number of OH- must be added to turn the remaining H+ into water molecules
by torialmquist1F
Sun Feb 18, 2018 7:16 pm
Forum: Balancing Redox Reactions
Topic: Balancing Redox Reactions
Replies: 4
Views: 232

Re: Balancing Redox Reactions

I believe you don't use H3O+ because then it would unbalance the oxygens in the reaction
by torialmquist1F
Sun Feb 11, 2018 9:43 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Gas Constant, R
Replies: 6
Views: 255

Gas Constant, R

Will we ever need to use one of the other gas constants given on the constants/equations sheet for the midterm or only the 8.314 one?
by torialmquist1F
Sun Feb 11, 2018 9:37 pm
Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
Topic: Comparing Molar Entropies
Replies: 2
Views: 161

Comparing Molar Entropies

What do we look for when deciding which has higher molar entropy?
For example, why can we say that Lead has a higher molar entropy than Carbon?
by torialmquist1F
Sun Feb 11, 2018 9:33 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Practice Midterm 3A
Replies: 3
Views: 175

Practice Midterm 3A

How do we know to whether to use Cv or Cp when calculating with the nClnT2/T1 equation?
by torialmquist1F
Sun Feb 04, 2018 10:22 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Transfer Test 1 Concept Question
Replies: 2
Views: 145

Heat Transfer Test 1 Concept Question

Why is heat being transferred when a balloon filled with gas is expanded to a larger volume and lower pressure while maintaining the same temperature?
by torialmquist1F
Sun Feb 04, 2018 10:19 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Open, closed, or isolated test 1 question
Replies: 10
Views: 590

Open, closed, or isolated test 1 question

Is a 20mL vial with an organic solvent open, closed, or isolated and why?
by torialmquist1F
Sun Feb 04, 2018 10:17 pm
Forum: Gibbs Free Energy Concepts and Calculations
Topic: Sig Figs
Replies: 6
Views: 154

Sig Figs

Are sig figs important when doing these calculations?
by torialmquist1F
Sun Jan 28, 2018 9:36 pm
Forum: Phase Changes & Related Calculations
Topic: Endothermic or Exothermic
Replies: 20
Views: 562

Endothermic or Exothermic

Is condensation endothermic or exothermic and why?
by torialmquist1F
Sun Jan 28, 2018 9:34 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Open, closed, or isolated [ENDORSED]
Replies: 3
Views: 256

Open, closed, or isolated [ENDORSED]

Is the universe an open, closed, or isolated system and why?
by torialmquist1F
Tue Jan 23, 2018 12:05 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Hess's Law
Replies: 5
Views: 196

Hess's Law

When using Hess's law to calculate enthalpy, can you eliminate a molecule within the same equation? For example, if one of the equations has CO2 on both sides can they be crossed out?
by torialmquist1F
Sun Jan 21, 2018 6:47 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Heat Capacity vs Specific Heat Capacity
Replies: 2
Views: 106

Heat Capacity vs Specific Heat Capacity

Can someone clarify the difference between Heat Capacity and Specific Heat Capacity and how they relate to extensive and intensive properties?
by torialmquist1F
Sun Jan 21, 2018 6:03 pm
Forum: Phase Changes & Related Calculations
Topic: Heating Curve Calculation Confusion
Replies: 3
Views: 167

Heating Curve Calculation Confusion

If there is a question where we have to convert ice to water vapor, do we have to use MCdeltaT twice to account for the temp change between the solid to melting point and also from the melting point to the boiling point? So would it be MCdeltaT+phase change+MCdeltaT+phase change
by torialmquist1F
Sun Jan 21, 2018 5:43 pm
Forum: Phase Changes & Related Calculations
Topic: Work Equation
Replies: 3
Views: 109

Work Equation

Where/what does the negative in the w=-PdeltaV (work equation) come from and signify?
by torialmquist1F
Sun Jan 14, 2018 8:52 pm
Forum: Phase Changes & Related Calculations
Topic: Exercise 8.31
Replies: 3
Views: 173

Re: Exercise 8.31

Chem_Mod wrote:The equation used for calculating heat released is q=mCΔT. Since we are told that Kr behaves as an ideal gas, we can use the specific heat capacity for ideal gases at constant pressure (Cp=5/2R) and at constant volume (Cv=3/2R).


Where does the 5/2R come from?
by torialmquist1F
Sun Jan 14, 2018 8:44 pm
Forum: Reaction Enthalpies (e.g., Using Hess’s Law, Bond Enthalpies, Standard Enthalpies of Formation)
Topic: Standard Enthalpy Formation
Replies: 2
Views: 100

Standard Enthalpy Formation

Can someone explain what Standard Enthalpy Formation is and why is it 0 for elements in their most stable form?
by torialmquist1F
Sun Jan 14, 2018 8:35 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Molar Heat Capacity
Replies: 4
Views: 109

Molar Heat Capacity

Does an increase in number of elements in a molecule correlate to a higher molar heat capacity? Or how do we know which molecule will have a higher molar heat capacity?
by torialmquist1F
Thu Dec 07, 2017 6:53 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Lewis Structure of Coordination Compounds
Replies: 1
Views: 110

Lewis Structure of Coordination Compounds

When drawing the lewis structure of coordination compounds can we leave the ligands together as one branch off of the the central atom, or do we need to break down the structures of the ligands too? For example can I write NH3 together or do I need to break it down into its four bonds?
by torialmquist1F
Thu Dec 07, 2017 6:44 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Dentates
Replies: 4
Views: 278

Dentates

Are (COO) and (N)'s the main things to look for in a coordination compound to find out if it is monodentate/bidentate/etc? Are there any others?
by torialmquist1F
Thu Dec 07, 2017 6:36 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Change in concentration
Replies: 2
Views: 139

Change in concentration

Will how the pressure is changing always be given? For example, will it always tell us that it is a result of change in volume or other?
by torialmquist1F
Thu Dec 07, 2017 6:12 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Relationship between Kpa and Ph
Replies: 3
Views: 225

Relationship between Kpa and Ph

Is there a direct relationship between Ka and pH, or Kb and pOH?/
by torialmquist1F
Thu Dec 07, 2017 6:08 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Finding Q and which way the reaction shifts
Replies: 1
Views: 119

Finding Q and which way the reaction shifts

When given a problem asking to find the equilibrium concentrations of multiple compounds involved in a reaction, and when all the initial molarities and a Kc value are given, how do you know which compounds to make the reactants and products to find Q? We need to know Q to know which way the reactio...
by torialmquist1F
Mon Nov 27, 2017 12:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs Nonpolar [ENDORSED]
Replies: 2
Views: 142

Polar vs Nonpolar [ENDORSED]

What is the best way to determine if the dipole moments will cancel out and make the molecule non polar?
by torialmquist1F
Mon Nov 27, 2017 12:20 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs and naming shape
Replies: 2
Views: 118

Lone pairs and naming shape

Is the lone pair taken into account when naming the shape of a molecule? Why or why not?
by torialmquist1F
Sun Nov 19, 2017 5:49 pm
Forum: DeBroglie Equation
Topic: Midterm Question: wavelike properties
Replies: 6
Views: 298

Midterm Question: wavelike properties

What does it mean to have measurable wavelike properties?
by torialmquist1F
Sun Nov 19, 2017 5:44 pm
Forum: Lewis Structures
Topic: Midterm Question: Lewis Structure for HOCO [ENDORSED]
Replies: 6
Views: 796

Midterm Question: Lewis Structure for HOCO [ENDORSED]

What does this lewis structure look like? I know that it is a radical but do not know how to draw it.
by torialmquist1F
Sun Nov 12, 2017 9:19 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Most Favorable Formal Charge
Replies: 5
Views: 2226

Most Favorable Formal Charge

When it is impossible that all elements can have 0 formal charge, does it matter which ones get the formal charge? Should it be the central element or the outside ones?
by torialmquist1F
Sun Nov 12, 2017 9:14 pm
Forum: Octet Exceptions
Topic: Expanded Octet
Replies: 4
Views: 262

Expanded Octet

How do we know when it is best to give an element an expanded octet?
by torialmquist1F
Fri Nov 03, 2017 11:08 am
Forum: Ionic & Covalent Bonds
Topic: Covalent/ Ionic Bond
Replies: 5
Views: 276

Covalent/ Ionic Bond

How do we determine it two elements will form and ionic or covalent bond?
by torialmquist1F
Fri Nov 03, 2017 11:05 am
Forum: Trends in The Periodic Table
Topic: Electron Affinity Trend
Replies: 1
Views: 218

Electron Affinity Trend

Are there exceptions to the electron affinity trend in the periodic table?
by torialmquist1F
Thu Oct 26, 2017 8:51 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: d and s blocks
Replies: 16
Views: 726

d and s blocks

Why is the d block written before the s block? Could they be interchangeable or it has to be that way?
by torialmquist1F
Thu Oct 26, 2017 8:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Orbital Shape
Replies: 3
Views: 217

Orbital Shape

Do we need to know the shape of the different orbitals for the test/ midterm?
by torialmquist1F
Fri Oct 13, 2017 8:03 pm
Forum: Properties of Electrons
Topic: Energy Level Change
Replies: 5
Views: 304

Energy Level Change

Does an excited electron always drop back down to level 1 to become most stable? Or is it possible that it will drop to a level higher than one?
by torialmquist1F
Fri Oct 13, 2017 8:01 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Balmer/Lyman Series [ENDORSED]
Replies: 7
Views: 387

Balmer/Lyman Series [ENDORSED]

What are the significances of these series? What do we need to know about them?
by torialmquist1F
Fri Oct 06, 2017 2:43 pm
Forum: Balancing Chemical Reactions
Topic: Equation Notation [ENDORSED]
Replies: 2
Views: 195

Equation Notation [ENDORSED]

When writing chemical equations, why are some atoms paired together in parenthesis with a subscript?
For example Ca5(PO4)3OH
Does this mean that the 3 applies to all elements in the parenthesis?
by torialmquist1F
Fri Oct 06, 2017 2:33 pm
Forum: SI Units, Unit Conversions
Topic: Base Units
Replies: 6
Views: 424

Re: Base Units

You only have to convert to base units if they ask for it in the answer. Also, some equations will require you to convert before solving such as the molarity equation because you have to divide by liters.

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