CHEMISTRY COMMUNITY

torialmquist1F

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?

torialmquist1F

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?

torialmquist1F

A photon checks into a hotel and is asked if he needs any help with his luggage. He says, "No, I'm traveling light."

torialmquist1F

torialmquist1F

torialmquist1F

Don't trust atoms, they make up everything.

torialmquist1F

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?

torialmquist1F

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?

torialmquist1F

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

torialmquist1F

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 ...

torialmquist1F

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?

torialmquist1F

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?

torialmquist1F

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

torialmquist1F

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

torialmquist1F

I believe you don't use H3O+ because then it would unbalance the oxygens in the reaction

torialmquist1F

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?

torialmquist1F

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?

torialmquist1F

How do we know to whether to use Cv or Cp when calculating with the nClnT2/T1 equation?

torialmquist1F

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?

torialmquist1F

Is a 20mL vial with an organic solvent open, closed, or isolated and why?

torialmquist1F

Are sig figs important when doing these calculations?

torialmquist1F

Is condensation endothermic or exothermic and why?

torialmquist1F

Is the universe an open, closed, or isolated system and why?

torialmquist1F

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?

torialmquist1F

Can someone clarify the difference between Heat Capacity and Specific Heat Capacity and how they relate to extensive and intensive properties?

torialmquist1F

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

torialmquist1F

Where/what does the negative in the w=-PdeltaV (work equation) come from and signify?

torialmquist1F

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?

torialmquist1F

Can someone explain what Standard Enthalpy Formation is and why is it 0 for elements in their most stable form?

torialmquist1F

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?

torialmquist1F

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?

torialmquist1F

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?

torialmquist1F

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?

torialmquist1F

Is there a direct relationship between Ka and pH, or Kb and pOH?/

torialmquist1F

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...

torialmquist1F

What is the best way to determine if the dipole moments will cancel out and make the molecule non polar?

torialmquist1F

Is the lone pair taken into account when naming the shape of a molecule? Why or why not?

torialmquist1F

What does it mean to have measurable wavelike properties?

torialmquist1F

What does this lewis structure look like? I know that it is a radical but do not know how to draw it.

torialmquist1F

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?

torialmquist1F

How do we know when it is best to give an element an expanded octet?

torialmquist1F

How do we determine it two elements will form and ionic or covalent bond?

torialmquist1F

Are there exceptions to the electron affinity trend in the periodic table?

torialmquist1F

Why is the d block written before the s block? Could they be interchangeable or it has to be that way?

torialmquist1F

Do we need to know the shape of the different orbitals for the test/ midterm?

torialmquist1F

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?

torialmquist1F

What are the significances of these series? What do we need to know about them?

torialmquist1F

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?

torialmquist1F

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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