CHEMISTRY COMMUNITY

Emily Kennedy 4L

So I was watching an example using the Arrhenius Equation and in their equation, it is 1/T2-(1/T1) but in the textbook, it is the reverse. The answer is going to be different depending on which order you place them in so which one should I use?

Emily Kennedy 4L

why do we only look at the reactants when writing a rate law from a mechanism?

Emily Kennedy 4L

What are some real life examples of 1st order reactions?

Emily Kennedy 4L

What are some real life examples of second order reactions?

Emily Kennedy 4L

I can second that, I do remember Lavelle saying we could assume microscopic reversibility

Emily Kennedy 4L

does having more catalyst change the order of a reaction?

Emily Kennedy 4L

the haber process is a good example of this if you look it up. it is a way of producing ammonia from hydrogen and nitrogen gas.

Emily Kennedy 4L

sometimes even just doing the more of the tricky questions really helps too

Emily Kennedy 4L

Usually any constants that are needed will be given in the question details

Emily Kennedy 4L

How can something be both the Reducing and Oxidizing agent?

Emily Kennedy 4L

How does the conc. of a substance affect the gibbs free energy?

Emily Kennedy 4L

When it asks for a skeleton equation how do we know to include water vs just showing the transfer of electrons?

Emily Kennedy 4L

if you look in the txtbook there is a chart that does a good job of outlining this

Emily Kennedy 4L

how much of electrochemistry do you think it will include?

Emily Kennedy 4L

So if the the rxn that we are trying to find the delta G for has two products o we just add their enthalpies and entropies together and then solve for delta G?

Emily Kennedy 4L

highly recommend youtube videos too, sometimes just watching someone do the problem and seeing how they lay it out really helps

Emily Kennedy 4L

where does the 3/2 come from?

Emily Kennedy 4L

W(reversible) will always be higher than irreversible because work is being done by the system, whereas with W(irreversible) work is being done on the system thus it is losing heat.

Emily Kennedy 4L

if they are not in the same state does the molecule just get brought down into the final equation?

Emily Kennedy 4L

This is the equation to find the standard enthalpy change of formation

ΔHoreaction=∑ΔHof(products)−∑ΔHof(Reactants)

Emily Kennedy 4L

how do you find the number of moles of H2O ?

Emily Kennedy 4L

generally in a neutralization reaction and an acid and a base react the products are a salt and water. For example when you mix NaOH+HCl=H20+NaCl thus forming a salt.

Emily Kennedy 4L

if the approximation is above 5% then is the complete answer void?

Emily Kennedy 4L

if you are given one value in a concentration and one in partial pressure you should use the equation to get them all in the same units

Emily Kennedy 4L

I don't quite understand why it is a change in concentration instead of a change in pressure.

Emily Kennedy 4L

and the concentration is the number of moles over the volume

Emily Kennedy 4L

we only use this equation to convert from partial pressure to concentration and vice versa rt?

Emily Kennedy 4L

amphiprotic can donate and accept protons
amphoteric react as both acids and bases

Emily Kennedy 4L

less distorted electron cloud that is larger

Emily Kennedy 4L

I think since it is in the hw problems, it would probably be a safe bet to know them.

Emily Kennedy 4L

I would know all the strong acids and some of the weak acids too. Especially some of the ones used in biological models.

Emily Kennedy 4L

I think he just wanted to show the structure of the molecule more than the actual accuracy of the order of the elements.

Emily Kennedy 4L

Because the hybridization of the model is based on the number of regions of electron density around the central atom

Emily Kennedy 4L

The shape is determined by the position of the nucleus and its electrons. Position or geometry does not take into account the additional areas of electron density that are pushing the electrons in the ideal structure. The position does, however, take into account the electron affinity of different e...

Emily Kennedy 4L

It has to do with the periodic trends and how they affect bonding. Chlorine has a stronger electron affinity than hydrogen, therefore, will be unbalanced and have a charge if both chlorines or both hydrogens are on the same side. However, if they are equally distributed so is the charge.

Emily Kennedy 4L

In addition to this Xenon also has an expanded octet

Emily Kennedy 4L

How do you know when to use the cis and trans prefixes?

Emily Kennedy 4L

How do you know when to use the cis and trans prefixes?

Emily Kennedy 4L

Can someone explain to me why you can have multiple pi bonds in a molecule but only 1sigma bond?

Emily Kennedy 4L

How are double and triple bonds represented in the VSEPR models?

Emily Kennedy 4L

I understand that regions of high electron concentrations repel one another but, how do you know how much they repel one another? For example, the seesaw, tetrahedral, and square planar shapes have the same number of bonds, yet they have very different models.

Emily Kennedy 4L

are there any tricks to learning the octet exceptions and knowing how many bonds each element usually wants?

Emily Kennedy 4L

So we are solving for the final energy level. We know the initial value is in the ultraviolet region, therefore n=1 initially. the final value must be greater than n=1 and if we use En=-hR/n^2 Because we know the wavelength of the final observed hydrogen line we can find the change in energy and the...

Emily Kennedy 4L

So, basically what the book is saying is that groups of atoms on the periodic table tend to show similar characteristics and react with similar compounds. The example the book gives is that both lithium and magnesium react directly with nitrogen to form nitrides.

Emily Kennedy 4L

It all depends on what combination you can create with the lowest formal charge. If you have a lewis dot structure that should have a neutral charge and each atom has a negative 1 charge and a positive 1 charge that is not going to be as ideal as a lewis structure that has all neutral charges.

Emily Kennedy 4L

How do you connect Lewis dot structures of molecules, i.e. molecules like Nitrate and Ammonium?

Emily Kennedy 4L

How do we know the formal charge of a transition metal since it is not given?

Emily Kennedy 4L

When referring to the lowest energy it means that the molecule wants to have a full octet in the valence electrons. Therefore they have no electronegative energy.

Emily Kennedy 4L

What is the conversion for electrostatic units (esu)?

Emily Kennedy 4L

Can someone explain to me a real life application when we would be looking for the position and the momentum at the subatomic level?

Emily Kennedy 4L

Noble gases all have full shells therefore you can assume that it will have the maximum number of electrons in its outer shell. Generally this will end with p^6 except for helium in the 1s^2. Otherwise they will go through the usual sequence depending on which one you are trying to find the electron...

Emily Kennedy 4L

So, I understand that there are three points of r, theta, and phi in a wave function but what exactly do these tell us about the orbital?

Emily Kennedy 4L

Both Boltzmann's and Wien's law have to do with wavelength corresponding to intensity as the temperature increase so in what instances would you use the equations that correspond to the laws?

Emily Kennedy 4L

So, when you're trying to find the frequency of a wavelength why would you want to convert the units from s^-1 to Hz?

Emily Kennedy 4L

There is an acronym :

HNOFClBrI usually pronounced H nofclbri and those are all the diatomic molecules

Emily Kennedy 4L

So if your given an Anhydrous copper (II) sulfate what amount would would remain after removing 90% of the water from 360 g of CuSO4.5H2O?

Emily Kennedy 4L

To go from F to K you just need to subtract 32 from your initial temp, multiply the number by 5 and divide by 9 . Then you add 273.15 to your answer. This can be reversed to go from Kelvin to F too.

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