CHEMISTRY COMMUNITY

MariaJohn1D

why do we flip anode in cell notation?

MariaJohn1D

Sometimes when I write half reactions both species have the same charge? What do I do, how do I know how many electrons have been transferred?

MariaJohn1D

If the reactant is insoluble, then why would E cell be negative?

MariaJohn1D

What does it mean by standard potential of an electrode is the standard potential of the cell in which electrodes lies on the right and hydrogen electrodes lies on the left?

MariaJohn1D

For the equation deltaG= -nFE, why can’t you add up the E’s of both half reaction to get Ecell?

MariaJohn1D

When you double the equation why does the G increase the E stay the same?

MariaJohn1D

You need to use platinum as a metal electrode for both sides since none of the products or reactants are conducting metal solids. I2 is a solid at the anode, but since it is a metal it doesn't count. At the cathode, there are only aqueous ions so you would also need the platinum electrode here to a...

MariaJohn1D

Why do we flip the reducing agent in the cell notation for this question?

MariaJohn1D

Why do we use platinum on both sides in this case? Because one side already has a solid product?

MariaJohn1D

For the first bullet point on the second page of the outline, what is the explanation for "why reaction free energy depends on pressure and the equilibrium constant?"

MariaJohn1D

Is compression also a form of work?

MariaJohn1D

Does the pressure change in a bomb calorimeter?

MariaJohn1D

Delta U is the change in internal energy described by the first law of thermodynamics. The equation for delta u is heat (q) + work (w) = Internal energy ( delta U).

MariaJohn1D

I am still confused about the differences in pressure between the bomb calorimeter and coffee cup calorimeter. Why does the pressure change in a bomb calorimeter if its sealed?

MariaJohn1D

The book states that "The constant-volume and constant-pressure heat capacities of a solid substance are similar; the same is true of a liquid but not of a gas". Why is this not true for a gas? I'm curious about this as well because in lecture he said you need to specify these different h...

MariaJohn1D

Could this be considered an isolated system because it is insulated?

MariaJohn1D

I'm still confused about the difference between reversible and irreversible equilibrium. The book gives an example of a piston. Can someone please explain it in the context of that?

MariaJohn1D

Work is w=-P (pressure) (change in volume) . If the volume is increasing or decreasing change the sign accordingly. Also to convert J times atm to J multiply the value by 101.325 J/ L times atm.

MariaJohn1D

The 7th editon solution manual says 28J.

MariaJohn1D

Thank you so much for your words of wisdom!

MariaJohn1D

If avogadro calls tell him to leave his number...

MariaJohn1D

Do I know any jokes about sodium? Na

MariaJohn1D

A covalent bond joke? Thanks for sharing...

MariaJohn1D

Don't tell jokes to noble gases you'll get no reaction.

MariaJohn1D

I tell bad chemistry jokes bc all the good ones Argon...

MariaJohn1D

I like chemistry jokes bc they are funny
He He He

MariaJohn1D

The molecule with the lowest formal charge is deemed as most stable and that would be the most favorable resonance structure.

MariaJohn1D

VESPR is used to predict molecular geometry using valence shell electrons

MariaJohn1D

Isoelectronic means that both atoms have the same number of valence electrons. Ex: Na+,F-

MariaJohn1D

Isoelectronic means that both atoms have the same number of valence electrons. Ex: Na+,F-

MariaJohn1D

one sigma bond and 2 pi bonds

MariaJohn1D

a single particle of light is called a photon whereas a stream of photons is light

MariaJohn1D

What is a unit box?

MariaJohn1D

What is the relationship between Le Chatelier's principle and hydrogen molecules?

MariaJohn1D

What is the difference between oxoacids and carboxylic acids?

MariaJohn1D

What is meant by conjugate see saw?

MariaJohn1D

How do you know the pKa?

MariaJohn1D

What's a binary acid?

MariaJohn1D

They can be used interchangeably, but reagents are not usually solvents

MariaJohn1D

Why do you remove electrons from the highest energy levels first? Ex: from 5s^2 before 4d^10

MariaJohn1D

Changing the frequency changes the wavelength and changing the number of photons changes the light intensity.

MariaJohn1D

In a neutral atom the atomic and ionic radii are the same but if there are cations and anions the electron loses a shell and the ionic radius becomes smaller.

MariaJohn1D

The masses of these will be given on equation sheet.

MariaJohn1D

M represents magnetic momentum and l represents angular momentum

MariaJohn1D

These numbers respond to a single electron. Think of it like an ID number each electron has its unique set of quantum numbers.

MariaJohn1D

Why does the 4s orbital fill up before 3d orbital other than that it's at a "lower energy level"?

MariaJohn1D

Quanta is a small packet of energy such as a photon.

MariaJohn1D

When you know velocity of an electron and need to know wavelength use De Broglie's equation. lambda= h/mv

MariaJohn1D

Black bodies are hot objects that glow(incandescence) and as the temperature rises and shorter wavelengths. The ultraviolet catastrophe is when energy is transferred in packets(quanta), otherwise there would always be darkness.

MariaJohn1D

To go from the molecular formula to the empirical formula you should divide by the greatest common denominator. Please keep in mind that the molecular and empirical formula can be the same.

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