464 Answered Questions for the topic AP chemistry
What is the empirical formula for the tartrate ion?
How many grams of Cu(OH)2 will precipitate when excess KOH solution is added to 78.0 mL of 0.735 M CuCl2 solution? CuCl2(aq) + 2KOH(aq) Cu(OH)2(s) + 2KCl(aq)
Help me answer this chemistry ?!?!?
how much water vapor is contained in a cubic room 10 ft along an edge is the relative humidity is 50% and the temperature is 80F? the vapor pressure of water 80F is 26.2 mm Hg. the relative... more
What mass of HgBr2 can be produced from the reaction of 5.00mL mercury (density= 13.6g/ml) and 5.00mL bromine (density= 3.10g/ml)?
In the following redox reaction, which species is being reduced and which is being oxidized?
2 C2H6 (g) + 7 O2 (g) --> 4 CO2 (g) + 6 H2O (g)I got as far as identifying O2 as the species being reduced (oxidation state decreases) but then I got confused with how C2H6 is being oxidized... more
Calculate the concentrations of each ion remaining in solution after the precipitation is complete.
The precipitation reaction involves 75.0 mL of .0750 M solution of potassium phosphate and 75.0 mL of .0750 M iron (II) acetate.I'm very confused as to how to find the concentration of the... more
Which of the following solutions of strong electrolytes contains the largest number of ions?
50.0 mL of .175 M NaOH, 100.0 mL of .250 M BaCl2, or 250.0 mL of .050 M Na3PO4?I would really appreciate if you could explain what to do in order to determine which solution contains the most... more
Consider the combustion of 30.0 g of propane in excess oxygen. Write the balanced molecular equation for this reaction and find the maximum mass of H2O that can form
Concentration of the solute species?
What are the concentrations of all the solute species in 0.350 M lactic acid, HC3H5O2? This acid has ka = 1.4 x 10-4
Stronger base h or a
Given that the ka = 1.8 x 10-5 for acetic acid and the ka = 3.5 x 10-8 for hypchlorous acid, which is the stonger base, hypochlorite or acetate?
Justifying and selecting indicator
Select and justify a good indicator for the following titration:When 25 mL of 0.10 M formic acid (HCHO2) is titrated with 0.10 M NaOH.
Ka for ammonium
Ammonia, NH3, has a kb = 1.8 x 10-5. What is the Ka for ammonium?
Ka expression for an ionization
What would be the ka expression for the ionization of acetic acid (a weak acid).
Writing chemical equations
Write the chemical equation for the first and second ionization of sulfuric acid (a strong acid)
Calculating molar concentrations
Calculate the molar concentrations of H+ and OH- in solutions that have a pH = 8.26
Calculating the pH of a solution
Calculate the pH of a solution where [H+] = 3.6 x 10-4
Calculating OH- in a solution
Calculate the [OH-] in a solution in which the [H3O+] = 4.2 x 10-9 M
Conjugate acid-base pairs
Identify the conjugate acid-base pairs in the following reaction:HCO3− (aq) + H2O (l) ↔H2CO3 (aq) + OH− (aq)
Conjugat acid-base pairs
Identify the conjugate acid-base pairs in the following reaction:H2O (l) + H2O (l) ↔ H3O+ (aq) +OH− (aq)
Equilibrium constant value
A galvanic cell is based on the following half- reactions:Cu+2 (aq) + 2e- à Cu (s) ɛ° = 0.34 VV+2 (aq) + 2e- à V (s) ɛ° = -1.20 VIn this cell, the copper... more
Concentration of H+
HA is a weak, monoprotic acid that dissociated according to the equation:HA (aq) ßà H+ (aq) + A- (aq) Ka = 4.0 x 10-9If the initial concentration of HA is 0.10 M, find the... more
Molarity of the copper (I) hydroxide
A student uses acetic acid to titrate a solution of copper(I) hydroxide to determine the concentration of the copper (I) hydroxide. If 30.0 mL of 0.250 M acetic acid is needed to neutralize 15.0 mL... more
Galvanic cell based on half-reactions
A galvanic cell is based on the following half- reactions:Cu+2 (aq) + 2e- à Cu (s) ɛ° = 0.34 VV+2 (aq) + 2e- à V (s) ɛ° = -1.20 VIn this cell, the copper compartment... more
Please provide answer and if possible explanation
In the decomposition of ammonia on a platinum surface at 856 oC, 2NH3(g) → N2(g) + 3H2(g), changing the concentration of NH3 has no effect on the rate. Which unit below is the correct unit for the... more
Why is a calcium atom larger than a magnesium atom?
Please help explain in terms of not just periodic trends.