1. For cerium (III) hydroxide, Ce(OH)3, Ksp equals 2.0x10 –20. Calculate the molar solubility. What is the value of ÆGo for the dissolution of cerium hydroxide?

b. What is the molar solubility of Mg(OH)2 in a solution containing 1.0 x 10 –1 M NaOH? Ksp of Mg(OH)2 is 1.8 x 10 –11

c. The Ksp for AgCl at 25.0oC is 1.782x10–10. The Ksp at 35.0oC Is 4.159x10–10. What are ÆHo and ÆSo for the dissolution reaction of AgCl(s).

d. Ka for acetic acid is1.754x10-5 at 25oC. At 50.0oC,Kais1.633x10–5. What are ÆHo and ÆSo for the ionization of acetic acid?

A wire is placed on a table from West to East and has a current running through it from West to East. What direction is the magnetic field to the North of the wire? Select one: a. Into the table b. There is no magnetic field present c. Out of the table d. Pointed towards the East e. We cannot tell f. Pointed towards the South g. Pointed towards the North h. Pointed towards the West

If a magnetic field of no more than 1.0 x 10-3 T is to be allowed 30 cm from an electrical wire, what is the maximum current the wire can carry? PLEASE WRITE CLEARLY SO I CAN UNDERSTAND THE FORMULAS.

Consider an airplane patterned after the Fairchild Republic A-10, a twin-jet attack aircraft. The airplane has the following characteristics: wing area = 47 m², aspect ratio = 6.5, Oswald efficiency factor = 0.87, weight = 103,047 N, and zero-lift drag coefficient = 0.032. The airplane is equipped with two jet engines with 40,298 of static thrust each at sea level. The thrust-specific fuel consumption is 1.0 N of fuel per Newton of thrust per hour. The fuel capacity is 2800 gal, and the maximum gross weight is 136,960 N. Calculate the range and endurance at a standard altitude of 8 km, where ?_? = 0.526 kg/m³.

Zn(s) + HCL(aq) ----> Zn 2+(aq) +Cl-(aq) + H2(g) + heat.

Balance the equation and:

a)calculate the number of moles of hydrogen gas that can be produced from 1.0g of zinc (6.38g/mol) pellets, assuming the reaction completes.

b)Calculate the final temperature of the solution of 10.0 mL of 1.0 M aqueous HCl at an initial temperature of 20.7 degrees Celsius was used to consume the zinc pellets. Use deltaHrxn= -80.7 kJ/mol and assume that the hydrogen gas doesn't affect the temperature.

c) Calculate the volume of hydrogen gas collected at 1 atm pressure and the temperature from part b and ignore the contribution of water vapor.

The solubility of CO2 in a salt water lake at 298 K and 750 torr pressure was found to be 1.0 x 10-5 moles CO2/liter of aqueous solution. The Henry’s Law constant in this case is 3.0 x 10-2 mol/L.atm.

A) Please find the partial pressure of CO2 (g) (PCO2, in atm) in the air above the lake.

B) Please use your answer to determine the percentage of CO2 in the atmosphere.

C) Given the percentage of CO2 in the atmosphere is constant at sea level and below, please calculate the solubility (moles/liter of aqueous solution) of CO2 in the Dead Sea at 298 K and a pressure of 800 torr.

Thank you!

Consider the reaction: C2H4(g) + H2(g) <-> C2H6(g). For this process, deltaH = -137.0 kj/mol and deltaS = -120.6 J/mol*K. Based on these data and assuming deltaH and deltaS are temperature independent, answer the following questions;

1) Does this reaction favor products or reactants at 25 degrees C?

2) At 25 degrees C, is the reaction driven(dominated) by the entropy or the enthalpy?

3) Would a decrease in temperaturefavor the reactants or the products?

4) At what temperature would the equilibrium constant (K) equal unity (=1.0)?

The answers should be 1:products, 2:enthalpy, 3:products and 4:???? but I don't know why! Explaination please and answer to #4.

A furnace wall is composed of three layers: 15 cm of firebrick [k = 1.5 W/(m*K)], followed by 22.5 cm of kaolin insulation brick [ k = 0.075 W/(m*K)], and finally followed by 4 cm of masonry brick [ k = 1.0 W/(m*K)]. The temperature of the inner wall surface (firebrick) is 1400 K and the outer surface (masonry brick) is at 350 K. Assume each layer has an area normal to the direction of heat flow equal to 1 m^2.

a.) What is the temperature at the firebrick-kaolin interface?

b.) What is the temperature at the kaolin-masonry interface?

c.) Across what material is the temperature drop the highest?

QUESTION 10 Calculate the change in pH if 10mL of 0.1M HCl is added to the buffer made by mixing 25 mL of 1.0 M CH3COOH and 25 mL of 0.5 M CH3COONa. For these types of questions where a strong acid or base is added to a buffer solution, first write out the chemical reaction. What will the HCl react with: CH3COOH or CH3COO−? Since HCl is an acid, it will react with CH3COO-. Because HCl is a strong acid, it will completely react with CH3COO- to form CH3COOH. One approach to these problems is to make an ICE table and to work in mols. Complete the table below. Once the table is complete use the equation for [H3O+] in question 15. Q16 ICE table.png

1. A 93 kg mountain climber hangs from a nylon rope and stretches it by 14.5 cm. If the rope was originally 39.0 m long and its diameter is 1.0 cm, what is Young's modulus for the nylon (in Pa)?

Group of answer choices

2.21e+09 Pa

3.12e+09 Pa

3.21e+09 Pa

2.12e+09 Pa

6. If a certain mass of water falls a distance of 50.0 meters and all the energy is effective in heating the water, what will be the temperature rise of water? The specific heat of water is 1.00 cal/gm °C.

Group of answer choices

5.33° C

7.50° C

2.65° C

1.03° C

0.12° C

Three flasks, labeled A, B, and C, contained aqueous solutions of the same pH. It was known that one of the solutions was 1.0 × 10–3 M in nitric acid, one was 6 × 10–3 M in formic acid, and one was 4 × 10–2 M in the salt formed by the weak organic base aniline with hydrochloric acid (C6H5NH3Cl). (Formic acid is monoprotic.)

(a) Describe a procedure for identifying the solutions.

(b) Compare qualitatively (on the basis of the preceding information) the strengths of nitric and formic acids with each other and with the acid strength of the anilinium ion,

(c) Show how the information given may be used to derive values for Ka for formic acid and Kb for aniline. Derive these values.