Atomic & Quantum Theory

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DE BROGLIE CONCEPT OF MATTER WAVES

De broglie concept of matter waves

determine the ground stare term of vanadium+3?

Determine the ground state term for V3+.

The wave number of the light emitted by a certain source is 2 x 10 6 m-1. Then what is the wave length of this light ?

The wave number of the light emitted by a certain source is 2 x 10 6 m-1. Then what is the wave length of this light ?

Avogardro constant calculation. I need help answering a particular question and others similar.

How would i work out this question?

The mass of one atom of 12C is 1.99x10-23 g. Use this information to calculate a value for Avogadro constant. Show your working. (2)

Thank you :)

plz can anyone read my lab report n tell me if it´s correct?my whole chimestry course depends on it :( plzzz?

plz can anyone read my lab report n tell me if it´s correct?my whole chimestry course depends on it :( plzzz?  

 Heating of bicarbonate
1. Introduction
purpose:
The purpose of this lab is for us to find out which reactions are correct when sodium bicarbonate heats .
theory:
In this lab , we need to know how to find molar masses and convert it into molecules. We also need to know how to write a balanced chemical equation .
Amount of substance formula n = m / M,
Lot formula m = n * M ,
Molar mass formula M = n / m
Possible chemical reactions:
Proposal 1: NaHCO3 -> NaOH ( s ) + CO2 ( g )
Proposal 2: NaHCO3 -> Na2O ( s ) + H20 ( g) + CO2 ( g )
Proposal 3: NaHCO3 -> Na2CO3 ( s ) + H2O ( g) + CO2 ( g )

2nd execution:
materials:
crucible , crucible tongs , wave, Burner , Spoon , tripod .
Chemicals : 1.50 g NaHCO3 ( s ) .

execution:
The lab began with the reaction formulas balanced and then weighed empty crucible to know how much it weighs without sodium bicarbonate. Afterwards added 1.50 g of sodium bicarbonate ( NaHCO3) in the crucible . Thereafter treforten for holding crucible of burners. Moreover, with the help of the wave was measured measured the mass of the product. How would it know which of the reactions were in the best, and it did using to calculate the molar mass and mass.

3rd results:
Balancing the reactions are:
1. NaHCO3 -> NaOH ( s ) + CO2 ( g )
NaHCO3 -> NaOH ( s ) + CO2 ( g )
2nd NaHCO3 -> Na2O ( s ) + H2O ( g) + CO2 ( g )
2NaHCO3 -> Na2O ( s ) + H2O ( g ) +2 CO2 ( g )
3rd NaHCO3 -> Na2CO3 ( s ) + H2O ( g) + CO2 ( g )
2NaHCO3 -> Na2CO3 ( s ) + H2O ( g) + CO2 ( g )

M (NaHCO3 ) : Na = 22.1 g, H = 1.01 g , C = 12.0 g , O = 16.0 g * 3 = 83.11 g / mol
m (NaHCO3 ): 1.50 g
n (NaHCO3 ): 1.50 g / 83.11 g / mol = 0.01804 = about 0.02 moles
After the reaction mass was : 0.6 g
Bräkningar :
1. NaHCO3 -> NaOH ( s ) + CO2 ( g )
M (NaOH ) = Na = 22.1 g + O = 16.0 g + H = 1.01 g = 39.11 g / mol

m (NaOH ) = 0.6 g

n = 0.6 g / 39.11 g / mol = 0.015341 = about 0.02 moles
Amount ( mol) is equal on both sides .

2nd 2NaHCO3 -> Na2O ( s ) + H2O ( g ) +2 CO2 ( g )
M ( Na2O ) = 22.1 g * 2 + O = 16.0 g = 60.2 g / mol
m ( Na2O ) = 0.6g
n ( Na2O ) = 0.6 g / 60.2 g / mol = 0.009966 = approximately 0.011 mol

number of moles is double led so great on the left side . In order for us to know if it is the right reaction , so we need to multiply by (2 ) to get the same number of moles on both sides -> n ( Na2O ) = 0.009966 * 2 = 0.019932 = approximately 0.021 mol

3rd 2NaHCO3 -> Na2CO3 ( s ) + H2O ( g) + CO2 ( g )
M (Na2CO3 ) = 22.1 * 2 + 1.01 + 16.0 * 3 = 93.2 g / mol
m (Na2CO3 ) = 0.6g
n (Na2CO3 ) = 0.6 g / 93.2 g / mol = 0.0643777 = approximately 0.0064 moles

The number of moles is double led so great on the left side . Then we multiply by (2 ) to get the same number of moles of both sides.
n (Na2CO3 ) = 0.0643777 * 2 = 0.0128755 = about 0.013 moles
Calculations of the amount of substance has been shown that heating of potassium hydrogen carbonate takes place according to reaction formulas 3rd

discussion :
When sodium bicarbonate is heated , there was formed sodium carbonate, water and carbon dioxide. After the heating, the less mass as water and carbon dioxide is released , which means that they changed their aggregationsformler and became gases. The net amount calculated by the mass was already known and molar mass could be calculated, then it could take to be sorted out, please calculate the amount of substance for both sides and see which one has the most equal amount of substance with potassium bicarbonate. When the calculations were made , we did so with the form = n = m / M. This formula is used to calculate the amount of substance . In reactions 2-3 so had reactants twice more moles than the product because it was necessary to multiply the amount of substance by (2 ) to , know about substance quantities are equal on both sides. The heating of sodium bicarbonate takes place according to reaction # 3 to water, carbon dioxide and sodium carbonate is formed and for amount of substance is the most similar on both sides of the reaction, ie the page before the reaction occurred and the page after the reaction occurred .   

on an eye level, is an element made only of its kind of atoms, multiple atoms, or multiple isotopes of its atom?

I'm sorry if this sounds stupid, but it's confusing me.. so If there's a stick of iron for example, does this mean it's made entirely of iron atoms only? or mostly iron atoms along with other atoms as well?

 

Also, when talking of isotopes, would one sample of an element contain multiple isotopes of an element together? or does each collection of an element's isotope form a separate kind of the element when talking on eye level? 

how to solve what is the longest wavelength in nanometers that can deliver 444 kj/mol?


How to solve "what is the longest wavelength, in nanometers, thatcan deliver 444 kj/mol?

 

Quantum Numbers & Maximum Number of Electrons

Give the maximum number of electrons in an atom that can have these quantum numbers.

 
a.) n = 3, scripted l = 2, mscripted l = -1, ms = 1/2
 
b.) n = 1, scripted l = 0, mscripted l = 0
 
Please include an explanation as well as any formulas / rules if any are present.
Thank you very much.
 

Oxidation state of phosphorous a.) triphenylphosphine and b.) triphenylphosphine oxide

What is the oxidation state of phosphorous in a.) triphenylphosphine and b.) triphenylphosphine oxide ?

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