CHEMISTRY COMMUNITY

Jacquelyn Hill 1

How do you determine the value of "n" in the Nernst equation?

Jacquelyn Hill 1

How do you write the rate law without knowing the order of the reaction? For example, problem 15.49 in the book.

Jacquelyn Hill 1

Given the instantaneous rate of reaction is 2.54x10^-2 mol/(L*s), and the initial mass of each reactant is 1.2g confined to a 750mL vessel, what ia the rate constant of this reaction?

Jacquelyn Hill 1

The rate of AB4 gas consumption in this reaction is constant throughtout and is given as 0.400M/s. If your reaction vessel starts with 0.15M of B2C, how long will it take to get to 30M of B2C? : AB4 + C2 --> AC2 + B2C

Jacquelyn Hill 1

Can someone please rank these elements in order of increasing oxidizing power/decreasing reducing power to make sure I am thinking about it correctly?:
Mn, Ag, Ti
and: Pb, Al, Cu

Jacquelyn Hill 1

So in the case where gibbs free energy is negative, would entropy be positive?

Jacquelyn Hill 1

Oh okay thank you, this helped alot!

Jacquelyn Hill 1

Between a solid and liquid, which substance would have a higher molar entropy? Would a heavy solid have a higher or lower molar entropy than a lighter liquid or vice versa? Would a lighter solid have a higher or lower molar entropy than a heavy liquid?

Jacquelyn Hill 1

Also, is the size a more significant factor in determining this than the state that the molecule is in?

Jacquelyn Hill 1

How is this caused by a warmer temperature because it says that it maintains the same temperature

Jacquelyn Hill 1

How can you determine the amount of reducing or oxidizing power that an element has compared to other elements so that you can rank them in order of increasing or decreasing power?

Jacquelyn Hill 1

Is the size of a molecule significant in determining whether it has a higher molar entropy than another molecule?

Jacquelyn Hill 1

What determines whether change in entropy is positive or negative? And what would the signs of the other thermodynamic values be? (i.e gibbs free energy)

Jacquelyn Hill 1

In the situation that "A ballon filled with gas expands to a larger volume and lower pressure while maintaining the same temperature," how is heat considered to be transferred in the process?

Jacquelyn Hill 1

Between the two methods for calculating the change in standard enthalpy (using "products - reactants" or using the provided bond ethalpy values), why don't they result in the same answer?

Jacquelyn Hill 1

"OMG! I think I lost one of my neutrons"
"It'll be fine, you can get a new one free of charge!"

Jacquelyn Hill 1

Ar : Don't tell a joke to a noble gas because you'll get no reaction.

Na : Haha, That was sodium funny.

Ne : I slapped my neon that one!

Jacquelyn Hill 1

I tried to come up with another corny chemistry joke, but all of the good ones Argon.

Jacquelyn Hill 1

Is the conservation of energy the same as the first law of thermodynamics as stated in the book that "The internal energy of an isolated system is constant?" Or would the definition of the law of conservation of energy be insufficient to define the first law?

Jacquelyn Hill 1

Why is the universe considered a closed system?

Jacquelyn Hill 1

Thank you, that link was actually really helpful.

Jacquelyn Hill 1

What is the main purpose of the porous wall of the Daniell cell? And how does it achieve this purpose?

Jacquelyn Hill 1

Would the single reactant be considered both the oxidizing agent and the reducing agent?

Jacquelyn Hill 1

I'm pretty sure for one of them, the H must be balanced with H20 on one side and OH- on the other but I can't remember which is which.

Jacquelyn Hill 1

What changes when balancing the equation to an acidic reaction vs balancing the equation to a basic solution?

Jacquelyn Hill 1

Thank You, it took me a while but I figured it out!

Jacquelyn Hill 1

I re-read the section and realized that it is due to what order the reaction exhibits, first or second for this problem specifically.

Jacquelyn Hill 1

How is the rate law determined and what contributes to the exponents in them? For example for "2 HI --> H2 + I2 has the rate law k[HI]^2 while "2 N2O5 --> 4 NO2 + O2 has rate law k[N2O5] even though both "HI" and "N2O5" both have a coefficient of 2.

Jacquelyn Hill 1

What is the difference between the average rate over a certain period of time and the unique average rate?

Jacquelyn Hill 1

I'm not exactly sure how this problem results in the answer "1.72 (mmol H2)/L*h". : "The average rate of the reaction N2(g) --> 3 H2(g) S 2 NH3(g) over a certain period is reported as 1.15 (mmol NH3)!L"1!h"1. (a) What is the average rate over the same period in terms of the ...

Jacquelyn Hill 1

If there is a triple bond in a molecule, does that mean there will be one sigma bond and two pi bonds?

Jacquelyn Hill 1

What does the conjugate seesaw refer to?

Jacquelyn Hill 1

How are you suppose to find the value of the standard Gibbs free energy of a reaction?

Jacquelyn Hill 1

What is the overall purpose of bond order besides indicating the amount of bonds that exist between two atoms?

Jacquelyn Hill 1

When a molecule has a resonance structure, for example, two double bonds and one single bond, is the overall bond length a length that is closer to the length of a double bond and in between the length of the two?

Jacquelyn Hill 1

Why is carbon always a central atom?

Jacquelyn Hill 1

If a central atom has a formal charge, then the overall molecule will have an unbalanced charge and be more unstable than if it did not have a formal charge.

Jacquelyn Hill 1

A polar or non-polar bond is also only formed through covalent bonding because of the fact that the ions are sharing electrons, making them able to have a partial negative or positive charge. Ionic bonding wont create polar or non-polar ions since they will have full charges.

Jacquelyn Hill 1

If the problem says that it went from n=4 to n=2, does that mean 2 is the final? Or is 4 the final since it is the higher energy level?

Jacquelyn Hill 1

If both reactants are present in the same number of moles in the reaction, then there is considered to be no limiting reactant at all.

Jacquelyn Hill 1

In order to find which reactant is the excess and which is the limiting reactant, you first need to calculate the number of moles there are of each reactant in the reaction. Keeping the stoichiometric coefficients in mind, the reactant with more moles present is in excess while the lesser one is the...

Search found 41 matches