Write the balanced half-reactions of the following types of batteries :(oxidation and reduction both)

a. Alkaline dry cell

b. Nickel-Metal Hydride battery

c. Zinc-air battery

d. Lead storage battery

Aluminum reacts with hydrochloric acid, but copper does not react with the acid. When a mixture of aluminum and copper having a mass of 0.3579 grams is combined with excess hydrochloric acid, 315.50 mL of hydrogen gas, measured over water, is generated. The temperature at the time of collection is 27.3 ^oC (vapor pressure of water at 27.3 ^oC = 27.214 torr), and the total pressure in the collection container is 764.1 torr. Determine the mass percentage of aluminum in the original mixture.

I've pretty much got my chem exam down for tomorrow, but I really need guidance for this question. Please show work and explain what you did (doesn't have to be so detailed).

A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. In the laboratory a student burns a 0.337-g sample of bisphenol A (C15H16O2) in a bomb calorimeter containing 1040. g of water. The temperature increases from 25.90 °C to 28.10 °C. The heat capacity of water is 4.184 J g-1°C-1. The molar heat of combustion is −7821 kJ per mole of bisphenol A. C15H16O2(s) + 18 O2(g) 15 CO2(g) + 8 H2O(l) + Energy Calculate the heat capacity of the calorimeter. heat capacity of calorimeter = J/°C

A standard SCUBA diving tank holds 10.9 L of compressed air at 204.1 atm. a. What are the mole fractions of N2 (Tc = 126.20K and Pc = 33.5 atm) and O2 (Tc = 154.4K and Pc = 49.7 atm) in air?

b. Determine how many moles of air are in this tank when filled, assuming the tank is at 25°C.

What is Taq Polymerase and why should it be used?

types of field oxides and their comparisons

Consider a 1.0 L buffer containing 0.083 mol L^-1 HCOOH and 0.095 mol L^-1 HCOO^-. What is the pH of the solution after adding 6.0 x 10^-3 mol of NaOH? Express your answer to 2 decimal places.

i'm repeatedly getting 3.87 as my answer....would really appreciate some help!

Explain the difference between class and individual characteristics. What class and individual characteristics would an examiner look for in fingerprints? Bullets/cartridge casings? and footwear impressions?

2.0 mL of 0.5M HCl was added to 50 mL of 0.5M Formate-formic acid buffer at pH 3.6. (pKa= 3.75) What is the resulting pH after the addition of HCl?

2.0 mL of 0.5M HCl was added to 50 mL of 0.0625M Formate-formic acid buffer at pH 3.6. (pKa= 3.75) What is the resulting pH after the addition of HCl?

1.0 mL of 0.6M NaOH was added to 10 mL of 0.5M Acetate-acetic acid buffer at pH 4.2. What is the resulting pH after the addition of NaOH?

0.5 mL of 0.3M NaOH was added to 10 mL of 0.5M Acetate-acetic acid buffer at pH 4.2. What is the resulting pH after the addition of NaOH?

. Assuming a single hydrogen bond contributes ΔG ≈ -0.9 kcal/mol, calculate the contribution of the R38 hydrogen bonds to the IL2/IL2Rα binding free energy.

A)      -2.7 kcal/mol

B)      -0.9 kcal/mol

C)      -1.8 kcal/mol

D)      -3.6 kcal/mol

1. An aqueous polymer solution has a relative viscosity of 1.375 at 25 Celsius. What is the absolute viscosity of the solution? What is the specific viscosity of the solution?
2. If the intrinsic viscosity of an aqueous PEG solution is 0.200, what is the estimated molecular weight of the solute?

pH of acetic acid solutions. Remember, acetic acid is a weak acid, with a Ka = 1.8 x 10⁻⁵.

Obtain 10.0 mL of 0.10 M acetic acid and place in a clean dry 50.0 mL beaker. Predict the value of the pH. Measure the pH with the pH meter. Record the value.

Take 1.00 mL of the 0.10 M CH3COOH(aq) in the previous step, and put it in another clean beaker. Add 9.00 mL of deionized water and stir. What is the new concentration of CH3COOH(aq)? Predict the pH. Measure the pH. Record the value.

Add 90.0 mL of deionized water to the diluted CH3COOH(aq) in step 2. What is the new concentration of CH3COOH(aq)? Predict the pH. Measure the pH. Record the value.

Titration of a 15.0 mL solution of KOH requires 17.0 mL of 0.0250 M H2SO4 solution.

What is the molarity of the KOH solution?

M=?

Is it impossible to overdose on Vitamin C? Please explain. Site references.