CHEMISTRY COMMUNITY

Samantha Castro 1D

Test 3 will only cover material from chapter 3.

Samantha Castro 1D

I believe that we should use the formal charge equation that was given to us in class instead.

Samantha Castro 1D

Boron is an exception and is fine with only six valence electron in its outer shell.

Samantha Castro 1D

I also believe that you would need to look at more properties other than electronegativity to determine the type of bond.

Samantha Castro 1D

In general, the oxidation state is the number of electrons an atom gains, loses, or shares when it forms a chemical bond. The maximum positive oxidation state for chlorine would be +7. While the maximum negative oxidation state for chlorine is -1.

Samantha Castro 1D

Cations give up electrons in order to reach octet. Anions form ions that are larger than their original atoms. Also, anions are negatively charged ions, while cations are positively charged ions.

Samantha Castro 1D

In the E=hv equation, v stands for the frequency of photons. However, for the equation E=1/2mv^2 the v stands for the velocity of an electron.

Samantha Castro 1D

A continuous spectrum is the emission of a continuous range of frequencies of electromagnetic radiation.
A line spectrum shows a series of specific wavelengths of emitted light made when the visible part of light from excited atoms shine through a prism.

Samantha Castro 1D

I believe that you have to use the De Broglie equation for this problem, since the wavelength is given for a moving electron in this problem, in order to get the correct answer.

Samantha Castro 1D

You have to use E=hc/λ. Then, plug in the constants for h and c a and the given wavelength for lambda will get you the energy per photon.Next, you multiply by the given number of photons to get the total energy produced.

Samantha Castro 1D

Basically, E=hc/λ is just the derived version of E=hv because v=c/λ.

Samantha Castro 1D

The mass of an electron is 9.1095 x 10^-31 kg.

Samantha Castro 1D

The masses of both of these will be on the equation sheet.

Samantha Castro 1D

In addition, I also used E=hv and wavelength=c/v and came up with the same answer. But also using wavelenght=hc/E can work as well.

Samantha Castro 1D

Also, I think that the units for a photon are in joules (J).

Samantha Castro 1D

By definition avogadro's number is exactly 6.022 times 10^23. This constant is used in stoichoimetry. For instance, it is used to convert from moles to atoms. Such as multplying the molar mass by avagadro's number.

Samantha Castro 1D

Reactant and reagent are frequently used in chemistry problems. However, reagents are compounds that are added in order to check if a chemistry reaction will take place, and reactants is a substance involved in a chemistry reaction.

Samantha Castro 1D

Agreed, in part a it states 2.15 mil which means millimole. So, the conversion factor is 1,000 millimoles in 1 mole.Thats why they used 2.15 x 10^-3.

Samantha Castro 1D

In order to determine how much of the excess reactant will be produced , you must use the mass of the limiting reactant. Next, subtract the original amount of the excess reactant at first by how much excess reactant was made.

Samantha Castro 1D

I’m sure you can use 16.00 for the mass of the oxygen. Either 15.99 or 16.00 are fairly close, but Dr. Lavelle used 16.00 in his example.

CHEMISTRY COMMUNITY

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Re: Friday's Lecture [ENDORSED]

Re: Formal Charge

Re: BF3

Re: Electronegativity

Re: 3.23 (meaning of oxidation)

Re: Difference between anions and cations?

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Re: 4b practice midterm

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Re: Difference Between Equations [ENDORSED]

Re: Mass of an Electron [ENDORSED]

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Re: Photon units? [ENDORSED]

Re: Avogadro #

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Re: Which mass of oxygen should be used? [ENDORSED]