Write chemical equations for the five reactions described:
The first reaction involves the oxidation of copper with nitric
acid, resulting in a blue-green colored copper (II) nitrate,
Cu(NO3)2, solution.
The second reaction involves adding sodium hydroxide. This results in a double replacement or precipitation reaction produces a milky-blue copper (II) hydroxide solid.
The third reaction involves decomposition of the of the hydroxide compound to a black copper (II) oxide solid while applying heat.
After filtering the oxide, sulfuric acid is added to the solid to produce a blue copper (II) sulfate solution in a double replacement, or more specifically an acid-base reaction.
Finally, solid elemental copper is recovered through a single replacement reaction by the addition of zinc metal filings.
In: Chemistry
You find an old bottle of aspirin whose shelf life is expired. Assuming you have a bad headache, you have no other access to fresh aspirin, and you have a strong stomach can you expect to get relief from this outdated aspirin? Explain your reasoning.
In: Chemistry
Calculate [H3O + ] for a 2.5 x 10-4 M solution of weak acid (Ka = 5.3 x 10-4 )
1.4 x 10-4 M
2.1 x 10-4 M
6.2 x 10-4 M
7.3 x 10-4 M
1.9 x 10-4 M
In: Chemistry
A pure, low molecular weight hydrocarbon gas is burnt in a furnace giving a flue gas containing
10.8% CO 2 , 3.8% O 2 and the remainder nitrogen. Calculate the atomic ratio, H/C, and from this
the formula of the fuel. Note that this analysis is on a dry basis.
2nd part:
Calculate the analysis of the flue gases resulting from the combustion of ethane with 100%
excess air. Give the results on a dry basis.
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A mixture of oxygen and nitrogen gases is maintained in a 7.17 L flask at a pressure of 1.53 atm and a temperature of 41°C. If the gas mixture contains 8.88 grams of oxygen, the number of grams of nitrogen in the mixture is g.
A mixture of methane and argon gases, in a 6.68 L flask at 43 °C, contains 1.35 grams of methane and 5.20 grams of argon. The partial pressure of argon in the flask is atm and the total pressure in the flask is atm.
In: Chemistry
At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M[N2]=[O2]=0.200 M and [NO]=0.400 M.[NO]=0.400 M.
N2(g)+O2(g)−⇀↽−2NO(g)N2(g)+O2(g)↽−−⇀2NO(g)
If more NONO is added, bringing its concentration to 0.700 M,0.700 M, what will the final concentration of NONO be after equilibrium is re‑established?
[NO]final=
In: Chemistry
Gaseous ethane CH3CH3 reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. If 2.19g of carbon dioxide is produced from the reaction of 2.7g of ethane and 3.2g of oxygen gas, calculate the percent yield of carbon dioxide. Round your answer to 2 significant figures.
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What is the relationship between % transmittance and concentration?
In: Chemistry
explain how a QIAprep spin miniprep purification column (( with silica gel functional group (silanol))) works in regards to pH / pKa for binding and elution of DNA
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How much heat is evolved in converting 1.00 mol of steam at 150.0 ∘C to ice at -50.0 ∘C? The heat capacity of steam is 2.01 J/(g⋅∘C) and of ice is 2.09 J/(g⋅∘C).
In: Chemistry
A) what is the definition of an "amhiprotic" substance?
B) Illustrate with two equations how the dihydrogen phosphate anion is amphiprotic:
C) Validate/illustrate your answer to part (B) with two balanced equations and their Keqs.
D)Would a solution of potassium dihydrogen phophate be acidic or basic?
In: Chemistry
Answer the following chemistry question:
3. (a) The pKa for ferric ion Fe(+3) is 2. The pKa for cupric ion Cu(+2) is 9.
Which is a stronger Bronsted acid? Give and explain two reasons for the ten million-fold difference in their acidities
b) The Ksp for silver tarnish, that is the black Ag2S, is 10-39, one of the smallest values indicating a VERY insoluble solid. Why is silver sulfide so insoluble?
In: Chemistry
Compare the energy cost, in ATP equivalents, of synthesizing
stearate from mitochondrial acetyl-CoA to the energy recovered by
degrading stearate to CO2
.
In: Chemistry
Iron-56 has one of the highest binding energies of all nuclides.
Calculate its nuclear binding energy in
kJ per mol nucleon. 1 amu is equivalent to 1.492 ´ 10-10
J.
mass of iron-56 nuclide | 55.934994 amu (includes electrons) |
proton mass | 1.00728 amu |
neutron mass | 1.00866 amu |
electron mass | 5.4858 ´ 10–4 amu |
speed of light | 2.998 ´ 108 m/s |
In: Chemistry