CHEMISTRY COMMUNITY

AMahadi

Is the overall rate law of a reaction with multiple reactants the same rate law for the slowest step pertaining to a reactant of that reaction?

AMahadi

How does the concept of "kinetic control" or "kinetically controlled reactions" work?

AMahadi

Could we tell based on activation energy if a reaction is endothermic or exothermic?

AMahadi

Why is it that the probability of 3 molecules colliding simultaneously is unlikely?

AMahadi

Can someone explain what this equation is used to find ?

AMahadi

what does it mean when a reaction is first order compared to when a reaction is second order?

AMahadi

Why must a redox reaction be spontaneous in order for the energy released to be used as work?

AMahadi

Also if given a chemical equation, does the coefficient in front of the reactant automatically translate into the exponent in the rate law?

AMahadi

what exactly is a pseudo rate law and how is it obtained?

AMahadi

is the only way to determine rate law by experiment?

AMahadi

what is the conceptual relationship between enthalpy, entropy, and temperature to give Gibbs Free Energy?

AMahadi

what is the point of electrolytic cells? What are they used for?

AMahadi

what exactly does the nernst equation show?

AMahadi

If we calculate a standard potential and the value comes out to be negative, does that mean that it's not a galvanic cell?

AMahadi

how do you know which reaction is reduction and which is oxidation?

AMahadi

Change in entropy must be smaller than zero, for the entropy to decrease? If so, why?

AMahadi

how can the entropy change for a reaction be positive if the enthalpy change is negative?

AMahadi

What is delta S total, if not delta S universe? Also, do you need to factor in temperature when determining if a reaction is spontaneous?

AMahadi

what units would we use when calculating equilibrium concentrations?

AMahadi

How do you calculate percent ionization again?

AMahadi

Do we have to know this info for the midterm?

AMahadi

no review sheet yet! I'm sure he or Lavelle will announce it during lecture sometime this week.

AMahadi

How could you determine which substance has a higher molar entropy at a given temperature?

AMahadi

what determines an isolated system from a closed system?

AMahadi

Calculate the change in entropy when the pressure of 1.50 mol Ne(g) is decreased isothermally from 15.0 atm to 0.500 atm. Assume ideal behavior.

AMahadi

How do you calculate internal energy?

AMahadi

Would the opposite phases changes (vapor to liquid, and liquid to solid) always be exothermic?

AMahadi

How do you know which method to use to calculate ΔH?

AMahadi

what is this equation, ΔH= ∑bond broke - ∑bond, used for again?

AMahadi

When solving the enthalpy of a reaction using bond enthalpies, why do we perform reactants minus product while for all other enthalpy calculations we use products minus reactants?

AMahadi

Why is the standard enthalpy of formation of an element in its most stable form zero?

AMahadi

how does a reaction respond to minimize the effect of increasing pressure?

AMahadi

what does it mean if x less than 5% of initial, then approximation is ok?

AMahadi

what is the inverse relationship of kA and kB?

AMahadi

When do we use ICE tables? Is it used to find the concentrations of acid/bases and then that is used to find the poh/ph?

AMahadi

The lower the pkA and pkB, the stronger the acid or base?

AMahadi

Why is K = 1 considered rare?

AMahadi

How does a reaction respond to minimize the effect of increasing pressure?

AMahadi

When do you use Chatelier's Principle?

AMahadi

If K and Q are equal, does that mean that the system is at an equilibrium? If so, why?

AMahadi

If the K value is large/small, what does that indicate about the product?

AMahadi

What does delta x signify? And do you find it?

AMahadi

What type of compound is Al2(OH)3

AMahadi

Are all bent molecules polar? If so, why?

AMahadi

How do you find oxidation number again?

AMahadi

Is it preferred to name ligands with the IUPAC names or the other name? For example, is Cl- chloro or chlorido?

AMahadi

do all polar molecules have dipole moments?

AMahadi

Do we have to include cis and trans when writing out the names of certain molecules?

AMahadi

In general, if you see OH (or O-), SH (or S-), or N in a molecule, can you guess that the molecule can form a coordinate bond there?

AMahadi

What is a steric number?

AMahadi

What is the Crystal Field Theory and why is it significant?

AMahadi

how do you calculate coordination number of complexes?

AMahadi

what are chelating ligands and why are they significant?

AMahadi

what is the difference between diamagnetism and paramagnetism?

AMahadi

Why is sp3 more stable than sp2?

AMahadi

when do you use equilibrium arrows, for an acid-base reaction or for an acid or a base reacting with water?

AMahadi

Are dipole moments just created when two atoms have a difference in electronegativities?

AMahadi

what are the different ways to calculate bond order?

AMahadi

What is the VSEPR formula and do we have to know it?

AMahadi

why does hybridization occur?

AMahadi

Why does NaCl have a higher melting point than HCl?

AMahadi

What type of molecules tend to have LDF? Why are LDFs considered to be the weakest of the intermolecular forces?

AMahadi

In a bond between 2 atoms, can there only be one sigma bond?

AMahadi

how do you determine the length of a vector during a dipole-dipole moment?

AMahadi

how do you calculate the dipole moment of a molecule given the electronegativity values for the atoms comprising it?

AMahadi

why is hydrogen bonding the strongest intermolecular force?

AMahadi

So cations are smaller than their parent atoms and have a lower polarizing power when compared to anions?

AMahadi

Which bond has more ionic character, C–F or C–Br? Why?

AMahadi

Do all trends in the periodic table not apply to noble gases? If there are trends that apply, which ones?

AMahadi

I'm still confused as to what the relationship between the deBroglie wavelength and the mass is? If an atom has a longer wavelength does that mean it has a lighter mass or?

AMahadi

If there is a bigger difference in electronegativity, does that mean that the charge is higher?

AMahadi

Why does oxygen have a high electronegativity and what does that indicate?

AMahadi

Why is water not as effective in breaking covalent bonds?

AMahadi

What are delocalized structures?

AMahadi

Why are double bonds shorter than single bonds? Is it more than the interactions of doubles bonds being stronger?

AMahadi

Why is the formal charge of an atom indicative of it being more stable?

AMahadi

Does resonance lower energy of a molecule and if so why/how?

AMahadi

Why are compounds that have more resonance often more stable?

AMahadi

For week 4, is the topic for the hw the Quantum World even though we did it last week? Do we just pick 5 other problems?

AMahadi

I understand how the Schrodinger equation works but why is it significant to know?

AMahadi

I am confused as to how to find the e- configuration of ions.

AMahadi

What exactly is Electrostatic potential energy and why is significant to know when dealing with multi-electron atoms?

AMahadi

When does the speed of radiation decrease? What has to happen in order for it to decrease?

AMahadi

What does the Rydberg equation mean/help solve?

AMahadi

Why can't the DeBroglie Equation be applied to light?

AMahadi

what does the threshold energy represent?

AMahadi

A reaction container holds 5.77 g of P4 and 5.77 g of O2.The following reaction occurs: P4 + O2 --> P4O6. If enough oxygen is available then the P4O6 reacts further: P4O6 + O2 --> P4O10. a. What is the limiting reagent for the formation of P4O10? b. What mass of P4O10 is produced? c. What mass of ex...

AMahadi

I'm still having some difficulty balancing equations that require more than just inspection. Is there another, possibly longer but more accurate method to balancing "harder" chemical reactions. For example: Cu + HNO3 → Cu(NO3)2 + NO + H2O

AMahadi

Will we be provided with a periodic table during the test?

AMahadi

when do you use avogadro's number?

AMahadi

is the limiting reactant usually the one with the smallest number of moles? why or why not?

AMahadi

can a compound's empirical formula be the same as its molecular formula? When can you tell?

AMahadi

When are zeroes significant?
For example how many sig figs are in 32,000,000 compared to 0.3200 or 3.0200?

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