|
Indicate the oxidation number of each element in the following species. Click in the answer box to open the symbol palette. (a) Cr(s) (b) Br2(l) (c) Cr3+(aq) (d) Br-(aq) |
In: Chemistry
Using clear drawings, give a coordination chemistry example of:
a) ionization isomers
b) fac and mer isomers
c) optical isomers
d) linkage isomers
e) hydrate isomers
In: Chemistry
If you started with 0.274g of benzil and 0.198g of dibenzyl ketone:
1) What is the limiting reagent? How do we find out which one is limiting reagent?
2) What is the theoretical yield of tetraphenylcyclopentadienone? Please show detailed caclulations.
Thank You!
In: Chemistry
a hydrogen-oxygen fuel cell is used in the space program to generate clean energy. Describe, in detail, the principle and process of electrical energy generation from hydrogen-oxygen fuel cell. Also include in the discussion major advantages and limitations of such fuel cells.
In: Chemistry
A 25.0 mL sample of 0.35 M lactic acid, HC3H5O3, is titrated with 0.070 M KOH. Determine the pH of the solution at the equivalence point and at half-way to equivalence point. The Ka of lactic acid is 1.38x10^-4.
In: Chemistry
EX3
A solution contains 2.2x10-3M in CU2+ and 0.33M in LiCN. If the Kf for Cu(CN)42-- is 1.0x1025, how much copper ion remains at equilibrium?
In: Chemistry
Critique the accuracy of each of these statements.
A) Indicators such as methyl red provide accurate and precise measurements of pH.
B) According to the Arrhenius definition of acids and bases, ammonia qualifies as a base.
C) The strength of an acid or base changes as its concentration changes.
In: Chemistry
For the balanced equation shown below, if 98.0 grams of C2H3Br3 were reacted with 62.2 grams of O2, how many grams of Br2 would be produced? 4C2H3Br3+11O2=8CO2+6H2P+6Br2
In: Chemistry
87
What is the change in enthalpy (in kJ) under standard conditions when 246.4 g of sodium sulfate dissolves in water?
Answer:
In: Chemistry
A 1.250 g sample of barium chloride hydrate, BaCl2.xH2O, was
heated until all the water had been driven off. The remaining
anhydrous salt weighed 1.060g. Use this data to calculate the value
of x, the number of moles of water of crystallization in the
hydrated salt. You MUST Show ALL your work for full credit!
5. 0.0185 mol of hydrated magnesium sulfate MgSO4.xH2O has a mass
of 4.56g. Calculate the value of x, the number of moles of water of
crystallization in the hydrated salt. You MUST Show ALL your work
for full credit!
In: Chemistry
Calculate the pH of a buffer that is 0.225 M HC2H3O2 and 0.162 M KC2H3O2. The Ka for HC2H3O2 is 1.8
In: Chemistry
How do serine proteases hydrolyze dietary proteins? Describe the catalytic activity of chymotrypsin.
In: Chemistry
111 nmol of an antibody that binds strongly to the antigen protein G is covalently bound to the support of an affinity column with a void volume of 1.54 mL. The association equilibrium constant (KA) for the binding of protein G to the antibody is 6.67 × 108 M–1 at pH 7.1. Calculate the retention factor for protein G on this column at pH 7.1.
k = ___
At pH 7.1 and a flow rate of 2.00 mL/min, how many minutes would it take protein G to elute from this column?
tr = ____ min
If a pH 3.2 elution buffer is applied to the column, protein G elutes at 3.48 min using a flow rate of 2.00 mL/min. Under these conditions, what is the association equilibrium constant between protein G and the antibody?
KA = ____ M-1
In: Chemistry
As we’ve seen before in this class, the roasting of limestone (calcium carbonate) to make quicklime (calcium oxide) and carbon dioxide is an important industrial process because the quicklime is used to make cement, among other things. How many kJ of heat are needed to produce 1.0 metric tons of quicklime?
In: Chemistry
Methanol, CH3OH, is a nonelectrolyte; ammonia, NH3, is a weak electrolyte; and calcium hydroxide, Ca(OH)2, is a strong electrolyte. What are the solute particles present in aqueous solutions of each compound? (Select all that apply.)
| methanol | ammonia | calcium hydroxide |
|---|---|---|
|
CH3, OH2+, H+, O2-, CH3O- ,OH- ,CH3OH |
NH2+ , O2- , H+ , OH, NH3, NH4+ |
H+ ,Ca2+ , CaOH+ , Ca(OH)2, Ca(OH)3-,OH- |
If 0.1 mol of each compound is dissolved in solution, which one contains about 0.3 mol of solute particles, which contains 0.1 mol of solute particles, and which contains somewhere between 0.1 and 0.2 mol of solute particles?
| 0.3 mol solute particles | ---Select--- methanol ammonia calcium hydroxide |
| 0.1 mol solute particles | ---Select--- methanol ammonia calcium hydroxide |
| between 0.1 and 0.2 mol solute particles | ---Select--- methanol ammonia calcium hydroxide |
In: Chemistry