how does hot water separate silver (1) chloride from lead (2) chloride?

Copper reacts with dilute nitric acid according to:
3 Cu(s) + 8 HNO3(aq) ? 3 Cu(NO3)2(aq) + 2 NO(g) + 4 H2O(l)

If a copper penny weighing 3.045-g is dissolved in 37.23 mL of 3.750 M nitric acid and the resultant solution is diluted to 50.00 mL in a volumetric flask, what is the final concentration of NO3- in the solution?

A. An unknown radioactive substance has a half-life of 3.20hours . If 10.6g of the substance is currently present, what mass A0 was present 8.00 hours ago?

B. Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 45.0{\rm \\%} of an Am-241 sample to decay?

C. A fossil was analyzed and determined to have a carbon-14 level that is 20{\rm \\%} that of living organisms. The half-life of C-14 is 5730 years. How old is the fossil?

Consider the cadmium electrode, whose half-reaction is shown below. Calculate the potential of the electrode at 25 °C under the given conditions. A) Immersed in a 0.0120 M solution of CdBr2. B) Immersed in a 0.0490 M NaOH solution that is saturated with Cd(OH)2. Ksp for Cd(OH)2 is 7.2 × 10–15. C) Immersed in a 0.0140 M Cd(NH3)42 and 0.375 M NH3 solution. β4 for Cd(NH3)42 is 3.63 × 106.

Using the following portion of the activity series for oxidation half reactions

K(s) → K+ (aq) + e-

Al(s) → Al3+ (aq) + 3e-

Fe(s) → Fe2+ (aq) + 2e-

Sn(s) → Sn2+ (aq) + 2e-

Determine which reaction will occur.

A) Al3+(aq) with Fe(s)

B) Al(s) with Sn(s)

C) K+(aq) with Fe2+(aq)

D) K(s) with Sn2+(aq)

Complete each of the following nuclear reactions and calculate the energy change (in units J/mol of reactant) associated with each one. (Al-27 = 26.981538 amu, He-4=4.002603 amu, P-30=29.981801, W-179=178.94707, Ta- 179=178.94593)

(for below x / y , x = mass number while y = atomic number)

a. 27 / 13 Al + 4 / 2 He → 30 / 15 P + ______

b. 179 / 74 W + ______ →179 / 73 Ta

What type(s) of intermolecular forces exist between PH3 and CO32-?

A sample containing 2.00 x 10-2 mmol of Cu(NO3)2 and 3.00 x 10-2 mmol of K2SO4 is passed through an anion-exchange column. Calculate the volume of 0.0100 M HCl needed to titrate the eluate.

What is the change of pH upon addition of 10.0 ml of HCl 3.0 M to 750. ml of the following:

- pure water

- 0.1 M formic acid

- 0.1M acetate of sodium

- a buffer made of 0.1M potassium nitrite and 0.08 M nitrous acid.

Do you expect the ionization energies of anions of group 17 element to be lower than, higher than, or about the same for neutral atoms of the same group?

use the method of half reactions to balance the following equations: a) CrI3 (s) + Cl2 (g) ----> CrO 2-4 (aq) + IO-4 (aq) (basic) b) C2H5OH (aq) + I-3 (aq) ----> CO2 (g) + CHO-2 (aq) + CHI3 (aq) + I- (aq) (acidic)

Consider the base­catalyzed​reaction OCl­ (aq) + I­ (aq) → OH­ (aq) + Cl­ (aq) Determine the rate law and the rate constant, using the following initial rate data. (Hint: base­catalyzed​indicates that OH ­ affects the rate despite appearing as a product.)

How do I calculate the theoretical yield of the product in grams and mol?

Predict the effect of the following changes on the reaction in which SO3 decomposes to form SO2 and O2. 2 SO3(g)  2 SO2 (g) + O2 (g) Ho = 197.78 kJ

(a) Increasing the temperature of the reaction.

(b) Increasing the pressure on the reaction.

(c) Adding more O2 when the reaction is at equilibrium.

(d) Removing O2 from the system when the reaction is at equilibrium.

(e) Adding N2 gas to the reaction mixture

4. How do you decide whether to use enough hot water to dissolve acetanilide or enough to dissolve phenacetin?

5. If someone mixed sand into your unknown sample so you could not separate the grains of sand from the unknown solid, how could you separate them? Would the same action work if sucrose was mixed into your unknown?

6. Why would you allow the filtered liquid to cool slowly? What would happen if you did not allow slow cooling?

7. Why and when would you put the recrystallizing solution in an ice bath?