11/03/16
Why are complex ions formed in the first place? (Transition Elements)
This question comes under The Transition Elements topic.
After a bit of a research, I haven't come across a convincing answer at all.
11/02/16
Of all the measurements required to determine the delta H reaction which is likely to produce the greatest error and why
The lab's topic is Hess' Law and Calorimetry and the objective is to determine the heat formation of MgO using calorimetry and Hess' Law.
11/01/16
I have a chem lab due and it gives the following reaction Cu(s)+4HNO3(aq)->Cu(NO3)2 (aq)+2NO2(g)+2H2O(l)
then theres a chart and it asks for the mass or volume to be used or produced (g or mL) , Molar mass(g/mol) Molarity and diluent (if a solution) and moles used or produced. IDK where to get these...
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11/01/16
I have a lab due where it asks for the chemical reaction which is : Cu(s)+4HNO3(aq)->Cu(NO3)2(aq)+2NO2(g)+2H2O(l)
then theres a chart and it asks for the mass or volume to be used or produced (g or mL) , Molar mass(g/mol) Molarity and diluent (if a solution) and moles used or produced. IDK where to get these...
more
11/01/16
I need your help
Q- Changing soil redox conditions affect the availability of metal(loid)s to plants. How can you practically manipulate the soil redox potential of a soil?
Compare and contrast wavelength, frequency, and energy as they relate to the electromagnetic spectrum
Please explain in detail.
10/29/16
How to find forward and backward reaction rate constant for electrolysis reaction?
Giving values of charge Q recorded at different time, how do we find the rate constant of C+ne <->D knowing initial concentration of C and D?
10/29/16
Determine the structure for the following H-NMR spectral data
C9H10O
A Doublet 7.9 B. Doublet 7.4 C. Singlet 2.5 D. Singlet 2.4
C5H10O
A. Multiple 2.3-2.8 B. Singlet 2.1 C. Doublet 1.0
10/28/16
The rate of appearance
2A + B > C+D
the rate of disappearance of A in the reaction above is -d[A]/dt = K[A][B]2
what happens to the rate of appearance of C if the concentration of A is doubled and that of B is tripled
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HELP WITH A CHEM QUESTION PLEASE!!! LIGHT AND WAVES!!!!
The question is what is the weight of Orange (590 nm) in nanograms (ng)?
What is the answer to the question and how would you find this?
10/24/16
In general, how much does the pH of a NaOH solution change when diluting with water ? If the dilution process was continued indefinitely, what would the pH of t
In general, how much does the pH of a NaOH solution change when diluting with water ? If the dilution process was continued indefinitely, what would the pH of the NaOH solution eventually reach ?
10/24/16
Hydrogen Isotope PLEASE HELP :)
Naturally occuring H has three isotopes. H-1 is 1.001 amu, 99.82% abund. H-3 is 2.930 amu 0.070% abund. What must the atom. Mass of the third isotope be to account for the 1.008 (1.00794) amu mass...
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10/23/16
Serial dilutions. Need help with my lab
PART A
Mass of empty weighing dish=2.0795g Mass of weighing dish+NaOH=2.1808g Mass of NaOH=0.1013g Final Volume of NaOH stock solution A=50mL Concentration of NaOH stock solution = ? For that...
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10/21/16
Chemistry Help..
Consider the unbalanced reaction NiS2(s) + O2(g) --> NiO(s) + SO2(g)When 11.2 g of NiS2 react with 5.43 g of O2, 4.86 g of NiO are obtained. The theoretical yield of NiO is 1._______ ,the...
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10/16/16
Why does sodium fluoride has a higher boiling point than lithium fluoride?
Sodium has a larger ionic radius than lithium, so we would expect sodium fluoride to have a weaker ionic bond than lithium fluoride. However, this is not so, as instead sodium fluoride has a higher...
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10/16/16
Rusting of iron
Construct the equation for the reaction between iron(II) ions, hydrogen ions, H+ and oxygen to form iron(III) ions and water.
The answer is 4Fe2+(aq) + 4H+(aq) + O2(aq) -->4Fe3+(aq) +...
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10/15/16
Chromatography was developed using paper to seperate what?
a. analgesics b. ink dyes c. plant pigments d. hair color e. urine samples
10/15/16
Entropy, Internal Energy, etc
Consider a perfect gas contained in a cylinder and separated by a frictionless adiabatic piston into two sections A and B. All changes in B are isothermal. There is 2 mol of the gas in each...
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10/12/16
True or false? Sublimation is more like a melting point than a boiling point in that it is not affected by atmospheric pressure.
I really need help on this! Thank you!
10/12/16
Can someone please help me with LIGHT WAVELENGTHS??! BIOLOGY/CHEMISTRY
Hello. I am struggling a bit with understanding the concepts of transmission, absorption, and reflection, and was wondering if my thought process is correct for these questions.
1. What can be...
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10/11/16
Plotting graph of CuSO4 concentration (at each dilution) vs volume of solution
Hi, I really dont understand how to do this. If someone could help me out, Id appreciate it. This is all the info , I couldnt type it all in because its too much and the table is better in...
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10/08/16
Al shot and Al foil
compare the reaction of CuCl2 with Al shot and Al foil. Discuss some possible reasons for any difference in the reaction of the two forms of aluminum?
10/07/16
What is the maximun mass of S8 that can be produced by combining 85.0 g of each reactant? 8SO2+16H2S yield to 3S8+16H2O
What would the maximum mass be?
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