CHEMISTRY COMMUNITY

Tinisha 1G

Can someone explain what ions would affect the salt bridge?

Tinisha 1G

Can someone show how to derive the units of k for zero, first, and second order reactions?

Tinisha 1G

Can someone explain how I would differentiate a catalyst from an intermediate in a reaction?

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If it says average rate, then it is average. If it just says rate, then they are referring to the instantaneous rate.

Tinisha 1G

Can someone explain what happens to the electrons during corrosion?

Tinisha 1G

Can someone explain the concept of order of reactions? I understand how to find the order based on the rate law, but I don't understand it conceptually. Can someone help me?

Tinisha 1G

When you look at the rate law, you add the exponents of all the concentrations of the reactants.

Tinisha 1G

When you look at the rate law, you add the exponents of all the concentrations of the reactants.

Tinisha 1G

When do we use commas in a cell diagram vs. a horizontal line?

Tinisha 1G

What role does water play if the original equation has water in the products? Does it just cancel out by adding hydrogens when balancing?

Tinisha 1G

What role does graphite have in a galvanic cell?

Tinisha 1G

Can someone go through the steps to balance a redox reaction? Which elements do I look at first, which part do I balance first?
Thank you!

Tinisha 1G

For the compound C2H5OH, what is the oxidation state of C? I thought it was 2+, but the solutions manual is saying it is 2-?

Tinisha 1G

Can someone explain the concept of stable and unstable in terms of the Gibbs free energy? Why does a negative free energy mean that its stable?

Tinisha 1G

Why would you need to use the heat equation before solving for entropy with a temperature change?

Tinisha 1G

If the problem does not specify, do you use C(@constant pressure) or C(@constant volume) when calculating delta S with a temperature change?

Tinisha 1G

Irreversible systems have a constant pressure. Reversible systems have a changing external pressure, and we use the integral to add up all the infinitely small work increments from each change in pressure

Tinisha 1G

Irreversible systems have a constant pressure. Reversible systems have a changing external pressure, and we use the integral to add up all the infinitely small work increments from each change in pressure

Tinisha 1G

What are the different ways to find q in a reaction if you don't have a change in temperature to put in the mCdeltaT/nCdeltaT equations?

Tinisha 1G

You would multiply the amount of atm*L that you have by 101.325 J/atm*L to get your final answer in Joules.

Tinisha 1G

Negative work is represented by a system doing work on its surroundings. When work is done on system, it is positive work.

Tinisha 1G

Reversible processes do more work because the work is the integral of many consecutive efforts of changing pressure. Irreversible processes has a constant pressure and only has one whole effort.

Tinisha 1G

When you are writing a combustion reaction for H2, how do you know not to put CO2 on the product side? I thought all combustion reaction occur in the presence of oxygen and yields carbon dioxide and water?

Tinisha 1G

It’s important to note the difference between heat capacity and specific heat capacity. Heat capacity is not dependent on the amount of substance there is, and is an extensive property. Specific heat capacity does depend on the amount of substance there is, and is an intensive property.

Tinisha 1G

Why is the specific heat capacity of water so high?

Tinisha 1G

Which molecules have a standard enthalpy formation of 0? And why?

Tinisha 1G

Enthalpy is the amount of heat absorbed in a reaction. If the reaction is endothermic, it absorbs heat, so the sign of enthalpy is therefore postitive. It is negative if the reaction is exothermic, and so it is releasing heat, therefore is going to have a negative enthalpy.

Tinisha 1G

State properties do not depend on the path taken. For example, for work, it depends on the distance traveled. A system that takes a shorter path will have performed less work than a system that a system that took a longer path. The final value is dependent on how the system was carried out.

Tinisha 1G

Is the coefficient of the change row in the ICE table always match the stoichiometric coefficients of the reaction?
Thanks!

Tinisha 1G

How do you know which K value to use in an K eq. table when the equation you are looking at is comprised of two smaller equations with two different k values?

Tinisha 1G

If the only reactant is a solid, and the problem gives you a concentration for one of the products, can someone explain why for the initial change it is still positive x for both of the products?
Thanks!

Tinisha 1G

Can someone explain what is the purpose of the ICE chart is? And, how to calculate the C portion of it?

Tinisha 1G

When we are calculating using the ideal gas law, should we put the temperature in Kelvins or in Celsius?

Tinisha 1G

Hi!
When we calculate K, are we using equilibrium concentrations or initial concentrations?
Thanks guys!

Tinisha 1G

So the strength of the conjugate acid/base is inversely proportional to the strength of the acid/base?

Tinisha 1G

Lewis acids/bases are a more general concept than the Bronsted acids/bases. Bronsted acids are proton donors and bronsted bases are proton acceptors. Lewis acids are electron acceptors and Lewis bases are electron donors.

Tinisha 1G

If a molecule has resonance, does that mean they are a stronger or weaker acid?

Tinisha 1G

Can someone explain in detail the properties of metal oxides? and which ones are acids and bases?

Tinisha 1G

So if a molecule contains 2 hydrogen atoms does that mean it can donate 2 H+ and be a strong bronsted acid?

Tinisha 1G

This molecule has a bent shape. There are three electron densities and one lone pair, making the molecular shape bent.

Tinisha 1G

Sigma bonds are involved in hybridization, but pi bonds are not involved in hybridization.

Tinisha 1G

Can someone explain more in detail about the equatorial and axial axis?

Tinisha 1G

Every interaction between two molecules have London Dispersion Forces. Hydrogen bondings occurs when an H comes into contact with either an F, O, or N atom. Dipole-dipole forces occur that two polar molecules come into contact.

Tinisha 1G

You have to look at the electronegativities of the atoms. In a bond, one atom's electrons will be pulled towards the atom that has a greater electronegativity, resulting in a net partial charge. Do this for each atom. If all of the attached atoms are the same and their partial charges cancel out, th...

Tinisha 1G

If a molecule does not have lone pairs in the Lewis structure, then does that mean that both the electron arrangement and the molecular shape are going to be the same?

Tinisha 1G

Can someone explain in detail the importantance of an equatorial lone pair ?

Tinisha 1G

Can someone explain how to find out the number of atomic orbitals in a molecule?

Tinisha 1G

If the repulsion is low, that means that the electrons won’t be close to each other to have repulsion. Therefore, the electrons are farthest from each other. The closer the electrons, the more repulsion.

Tinisha 1G

A main thing to look out for is if the pulls from the electronegative atoms cancels out. If they do, it’s non polar, if they don’t it’s polar. You need to look at the shape and see if there is an uneven distribution of electrons.

Tinisha 1G

Is charge relevant when looking at which anion is more polarizable? Or do we just look at the size of the atom?

Tinisha 1G

Formal charge is dependent on the molecule the atom is in! There is no predetermined formal charge for an atom or element, it will vary based on what it is reacting with and whether that molecule is stable or not.

Tinisha 1G

Can someone explain the concept of how bigger atoms have more electron distortion and how that leads to a higher polarization?

Tinisha 1G

You need to check the formal charges of the atoms. The number of electrons drawn might be correct, but it will not be the most stable lewis structure until you make the formal charges as low as possible. A double bond can make the formal charges lower.

Tinisha 1G

Electronegativity increases as you go to the right on the periodic table because it is continuously getting more stable when you add more valence electrons to the outermost shell, and therefore the atom will have a higher tendency to want to keep those electrons. Therefore, the more the atom wants t...

Tinisha 1G

The bond length allows to have more insight on how strong the bond is as well!

Tinisha 1G

Use the periodic trends of atomic radii, and why this is what it is, to formulate your answer. As we go towards the right of the periodic table, the effective nuclear charge increases, and therefore, has a stronger pull on the electrons, making the radius of the atom smaller. As we go down the perio...

Tinisha 1G

The photoelectric effect demonstrates how electrons and light (little packets of energy called photons) have particle like properties. Their interaction is based on a one electron one photon interaction. According to De Broglie, anything that has rest mass has wave like properties, they can diffract...

Tinisha 1G

Another purpose of the photoelectric effect is that it demonstrates how electrons and light have particle like properties, since there is a one electron one photon interaction in this experiment.

Tinisha 1G

In the homework, there are questions that asked for the minimum uncertainty of the object's position, and when it said minimum, the solution's manual did not double the parameter of the velocity. Although, when it does not say minimum, they double the parameter? Does the word "minimum" pla...

Tinisha 1G

In a nodal plane, there is 0 probability of finding an electron, therefore the electron density goes to 0 approaching a nodal plane.

Tinisha 1G

Can someone explain what the rydberg equation tells us conceptually?

Tinisha 1G

How do I know when to use just the equation E=hv or when to use E=(hc)/v to find the energy of a photon?

Tinisha 1G

I would suggest always converting to Liters because molarity is moles/liters and the units always have to be consistent!

Tinisha 1G

The homework is due in the discussion sessions every week.

Tinisha 1G

It is the same method as finding the amount of atoms in an element, you use avogrado's constant. Formula units are applied to molecules and compounds!

Tinisha 1G

Pay attention to decimal points! Those indicate whether you count the zeros as significant figures in some cases.
For example 5000 has one significant figure, but 5000. has 4 significant figures!

I hope this helps!

Tinisha 1G

How do we know when not to use the formula M(initial)V(initial) = M(final)V(Final)? That was my plan for this problem, but it does not work out.

Tinisha 1G

Is there a trick in knowing how to write out Calcium sulfide in molecular terms?

Tinisha 1G

How do you find the amount of formula units for a compound that are present in a given sample (in grams)?

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