CHEMISTRY COMMUNITY

Mallika Singh 1G

Is the standard hydrogen electrode always the anode?

Mallika Singh 1G

for the value of Q, I know it uses the concentration of products and reactants; but for the coefficients, would we need to raise it to the power of the balanced redox reaction?

Mallika Singh 1G

I know adiabatic means that no energy is transferred as heat; is there any formula we need to know along with this word definition?

Mallika Singh 1G

if we're given the mass of water, and an accompanying density, I know we use the formula m/deltaDensity. however, we're given the density of both h20 in its liquid form and in its ice form. which do we use?

Mallika Singh 1G

I know the formula with the integral is for the reversible expansion, but does anyone know what the area under the curve means?

Mallika Singh 1G

what exactly was the purpose of the 3/2R and 5/2R constants? when would we need to use them?

Mallika Singh 1G

when working with cell potentials and the nernst equation, what do we do when we're given a quantity with bars as the unit? do we convert to M?

Mallika Singh 1G

what are we supposed to do when we're asked to calculate the solubility product?

Mallika Singh 1G

given a dilute solution, with water as a reactant, would we include [H20] in the rate law?

Mallika Singh 1G

In one of the homework questions, i believe 7.17, one of the main concepts was that a catalyst that only affects the rate of one step of the reaction , has no effect on the whole rate of the reaction, overall. is my takeaway correct?

Mallika Singh 1G

where exactly does lnA come from? I understand where all the other constants/variables come from, but not sure about this one.

Mallika Singh 1G

what is the correct unit for Activation Energy?

Mallika Singh 1G

for t1 and t2, should t1 always be the bigger temperature?

Mallika Singh 1G

So in the arrhenius equation, A is referred to as the pre-exponential factor; does anyone know *why* it's named that??

Mallika Singh 1G

How would you summarize the purpose of the Arrhenius equation?

Mallika Singh 1G

What exactly makes pre-equilibrium the more "simple" method?

Mallika Singh 1G

can someone summarize the key differences b/w the steady-state eq and the pre-eq?

Mallika Singh 1G

where exactly do the intermediates (which cancel out) come from?

Mallika Singh 1G

do we use steady-state or pre-eq in this class?

Mallika Singh 1G

The problem is: Beta blockers are drugs that are used to manage hypertension. It is important for doctors to know how rapidly a beta blocker is eliminated from the body. A certain beta blocker is eliminated in a rst-order process with a rate constant of 7.6 10 3 min 1 at normal body temperature (37 ...

Mallika Singh 1G

For example, what does the fast in "fast bimolecular dimerization" imply?

Mallika Singh 1G

how is the "speed" of a mechanism determined?

Mallika Singh 1G

When using the equation for the rate of consumption of [A] in the first order, does [A] always need to be expressed as a concentration? Could we use mass instead in the formula and get the right answer?

Mallika Singh 1G

When given a graph full of points of ln[A] vs t, all we need to do to find Kr is determine the slope? Do we use the typical slope equation (change in rise/run)?

Mallika Singh 1G

Ethene is a component of natural gas, and its combustion has been thoroughly studied. At a certain temperature and pressure, the unique rate of the combustion reaction C2H4(g) + 3 O2(g) --> 2 CO2(g) + 2 H2O(g) is 0.44 mol/Ls (a) What is the rate at which oxygen reacts? (b) What is the rate of format...

Mallika Singh 1G

How would we solve this problem? I'm not sure how to start here.

Confirm that liquid water and water vapor are in equilibrium when the
temperature is 100.C and the pressure is 1 atm. Data are available in Tables 4C.1 and 4G.1.

Mallika Singh 1G

Could someone please post their scratchwork for this problem? I keep getting 2J/K for the entropy change. 4F.17 Calculate the standard entropy of vaporization of water at 85 C, given that its standard entropy of vaporization at 100 C is 109.0 J/Kmol and the molar heat capacities at constant pressure...

Mallika Singh 1G

For a certain reaction at constant pressure, deltaH = -15 kJ,
and 22 kJ of expansion work is done on the system by compressing
it into a smaller volume. What is deltaU for this process?

To get the answer, we assume that the value for work is -22; isn't work positive if it's being done on the system?

Mallika Singh 1G

Gasoline, which contains octane, may burn to carbon monoxide if the air supply is restricted. Calculate the standard reaction enthalpy for the incomplete combustion of liquid octane to carbon monoxide gas and liquid water from the standard reaction enthalpies for the combustions of octane and carbon...

Mallika Singh 1G

Benzene is added to gasoline to increase the octane number. When 0.113 g of benzene, C6H6, burns in excess oxygen in a calibrated constant-pressure calorimeter with a heat capacity of 551 JC^-1, the temperature of the calorimeter rises by 8.60 C. Write the thermochemical equation for the reaction 2 ...

Mallika Singh 1G

For the breaking of a diatomic molecule's bond, what would the sign for delta H be? Why?

Mallika Singh 1G

If a reaction has more energy in its reactants, what will the sign of it's delta H be? How do we determine this?

Mallika Singh 1G

for calculating enthalpy change, when do you need to reverse the sign of delta H?

Mallika Singh 1G

What are the units of w?

Mallika Singh 1G

In order to derive the simplified formula, why do some of the intermediate steps have integrals? What do they represent in the context of the formula?

Mallika Singh 1G

What exactly is the meaning of U being a state property?

Mallika Singh 1G

can someone explain how we get from W=FD to W=P(deltaV)?

Mallika Singh 1G

What are some examples of a closed system doing work on its surroundings (as well as having work being done on it?)?

Mallika Singh 1G

is cooling a closed system equivalent to having the system do work on the surroundings?

Mallika Singh 1G

is doing work on a closed system the same as adding heat?

Mallika Singh 1G

is it possible to change the energy of an isolated system?

Mallika Singh 1G

What exactly is a bomb calorimeter? Why is it used as an example for an isolated system?

Mallika Singh 1G

For my notes under the definition of a closed system, I have (for the example specifically) "Ex: sealed beaker of water: Beaker does not insulate"
I'm confused as to what a lack of insulation has to do with it being a closed system? Or do I have the notes wrong? Thank you for your help!

Mallika Singh 1G

What does it mean when we say the eq is shifted to the right or left, in terms of K's values?

Mallika Singh 1G

Does K give us information about the relative concentrations of reactant and product?

Mallika Singh 1G

"If we make a reaction go faster, we can increase the amount of product at equilibrium" Is this true or false, and why?

Mallika Singh 1G

What are the parameters for K's intermediate values, ad what do they tell us?

Mallika Singh 1G

Why don't solids and liquids appear in the K expression?

Mallika Singh 1G

When do we use this formula?

Mallika Singh 1G

When a reaction's at equilibrium, does that mean the rate at which products and reactants are being formed are equal or merely constant?

Mallika Singh 1G

What exactly does K tell us about a reaction?

Mallika Singh 1G

B(OH)3 is a very weak acid because it does not have a conjugate system to delocalize...
This was the answer posted to the question; I was just wondering what it meant by a conjugate system in this context?

Mallika Singh 1G

The answer key says KBr will be neutral, but the previous similar compounds, like KF aren't? Why is that?

Mallika Singh 1G

Are we expected to know the formulas for these molecules?

Mallika Singh 1G

Why is HCl the stronger acid? Is there any other reason we should be aware of other than that its more electronegative?

Mallika Singh 1G

will we be tested on gibbs free energy and the related material? just wondering, because its in the section about acid and base strengths.

Mallika Singh 1G

For letter C, I can tell a change is occurring in the reaction, but can't exactly pinpoint which molecule is gaining what. How do we know a hydrogen hasn't been gained?

Mallika Singh 1G

What are the chemical equations for the proton transfer equilibria supposed to look like ?

Mallika Singh 1G

can someone provide an example of an arrhenius base in a reaction?

Mallika Singh 1G

what are the differences between questions asking us about denticity and chelating? what are we supposed to answer specifically for each type?

Mallika Singh 1G

so b12 contains cobalt which helps with anemia and some mental illnesses; what makes it so useful, structure wise?

Mallika Singh 1G

are there specific biological compounds that we need to memorize?

Mallika Singh 1G

can someone explain why carbonato is bi/monodentate?

Mallika Singh 1G

how does chemotherapy's structure as a coordinate compound serve its effectiveness?

Mallika Singh 1G

is benzene polar?

Mallika Singh 1G

given a triple bond, a double bond, a single bond, and a double bond in a resonance structure, where would the resonance bond length lie in comparison to the others?

Mallika Singh 1G

when determining the hybridization, the specific shape doesn't matter right? we only pay attention to the number of e density areas?

Mallika Singh 1G

in resonance structures, the same rules we would use to figure out the number of sigma and pi bonds still apply right?

Mallika Singh 1G

What exactly does it mean when they say the atoms rotate in sigma bonds?

Mallika Singh 1G

why is SO2 polar?

Mallika Singh 1G

why are covalent bonds stronger?

Mallika Singh 1G

why does boiling point increase with atom size?

Mallika Singh 1G

can someone explain why a bigger negative PE value means a greater attraction, while a more positive PE number means a lesser attraction?

Mallika Singh 1G

what's the name of the force that acts on np molecules and monatomic gases again?

Mallika Singh 1G

For the electronegativity numbers, will we be given a table or be asked to memorize any?

Mallika Singh 1G

Could someone break down the difference between ionization energy and electron affinity?

Mallika Singh 1G

what is the general trend associated with atom size and electronegativity?

Mallika Singh 1G

do coordinate covalent bonds form in nature? are they also more stable than regular bonds?

Mallika Singh 1G

What classifies a molecule as a Lewis acid or base? Is it just dependent on who receives the e pair in the reaction?

Mallika Singh 1G

Do isoelectronic atoms have the same electronegativity, along with the same number of electrons? Or is it only the latter?

Mallika Singh 1G

Could someone explain the guideline from the notes (8 e- -> s2p6)?

Mallika Singh 1G

Does anyone happen to have the unit for ionization energy?

Mallika Singh 1G

Could someone explain why cations are smaller than their parent atoms?

Mallika Singh 1G

Using given quantum numbers, what's the formula for determining the number of orbitals in a subshell? thank you!

Mallika Singh 1G

Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling.....

I've been using DeBroglie's eqn. for this, but I'm not getting the right answer? Could someone post their work? thank you!

Mallika Singh 1G

I was just wondering why we had to use that kinetic energy formula instead of being able to convert using the simple einstein equation. What am I missing here?

Mallika Singh 1G

So we were given the E = -hR/n^2 formula which, if i'm not wrong, can be used to give us the energy emitted by a transitioning electron. Is this formula only for electrons in a Hydrogen atom?

Mallika Singh 1G

How can Joules be written in terms of kg, m, and s? thank you!

Mallika Singh 1G

A lamp rated at 32 W emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?

What formula would we use for this? (this is probably in the wrong forum) Thank you!

Mallika Singh 1G

Is Energy directly or indirectly proportional to wavelength?

Mallika Singh 1G

What's the difference between the two concepts in terms of the photoelectric experiment?

Mallika Singh 1G

What are the differences between the two?

Mallika Singh 1G

Were we given the size of an electron?

Mallika Singh 1G

Could someone write out the steps to solving this problem? Self-test L.3A: A student used a sample of hydrochloric acid that was known to contain 0.020 mol HCl in 500.0 mL of solution to titrate 25.0 mL of a solution of calcium hydroxide.The stoichiometric point was reached when 15.1 mL of acid had ...

Mallika Singh 1G

n = cv is the equation we eventually use to solve for the answer right?

Mallika Singh 1G

I've become pretty familiar with the n = cv formula (explained on page F55), but I'm still a little confused as to when we would use the m = cMV. Could someone explain its use a bit further? thank you!

Mallika Singh 1G

Is there a difference in the procedure for preparing stock solutions as compared to regular solutions?

Mallika Singh 1G

This is a silly/obvious question, but when referring to molarity, or concentration in general, the book uses "c" or "M" interchangeably right? (just wanted to be sure that there's no difference in meaning for the two symbols. thank you!)

Mallika Singh 1G

hello! i was just wondering if anyone had any helpful tricks for memorizing the metric conversions (from pico to Tera)? thank you!!!

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