1. In two different experiments exactly 5 grams of fuel burns (combusts). The first experiment is under constant pressure conditions, and the second separate experiment is under constant volume conditions.

1. Which experiment is in a coffee cup calorimeter? And which is in a bomb calorimeter?
2. One experiment produces 25 kJ of heat and one experiment produces 23 kJ of heat. Which experiment (the constant pressure one or the constant volume one) produces 25 kJ of heat and which produces 23 kJ of heat? Why?
   
   Please type the answers, don't write them on a paper

32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 30.9 g of 32P, how much 32P was present 9.00 days ago?

How many different glycosides can be formed by linking one D-glucopyranose and one D-galactopyranose? Explain your reasoning.

An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for cadmium (Cd2 ) content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in ~ 50 g of homogenized dry weight. A representative 64.00 mg sample was taken from the ~ 50 g of dry material and dissolved in 100.00 mL of 0.1 M HCl to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.00-mL volumetric flasks, each containing 5.00-mL aliquots of the sample solution. Varying amounts of a 89.0 ppb (μg ·L-1) cadmium standard were added to each of the flasks, which were then brought to volume with 0.1 M HCl. The solutions were then examined for their Cd2 content using GFAAS, resulting in the following absorbance data.

Determine the amount of Cd2 per gram of dry clam. Express your final result as milligrams of Cd2 per gram of dry clam

Codeine (C₁₈H₂₁NO₃) is a narcotic pain reliever titrated with HCL. What is the pH of a 0.0500 M codeine hydrochloride solution with a pK_a of 5.80? Note the titrated form of codeine hydrochloride will act as a weak acid due to the formation of soluble ammonium salt.

Hydrogen holds promise as an environment-friendly fuel. How many grams of H₂ gas are present in a 54.0 L fuel tank at a pressure of 2501 lb/in² (psi) at 20.0°C? Assume that 1 atm = 14.7 psi.

The most important commercial process for generating hydrogen gas is the water-gas shift reaction: CH4(g) + H2O(g) ? CO(g) + 3H2(g)

?G° for this reaction at the standard temperature of 25°C is 1.423×102 kJ. Now calculate ?G°1150 for this process when it occurs at 1150 K.

5.)Part B

Calcium sulfate, CaSO4, has a Ksp value of 7.10×10⁻⁵ . What happens when calcium and sulfate solutions are mixed to give 2.00×10⁻³M Ca2+ and 3.00×10⁻²M SO42−?

Calcium sulfate, , has a value of 7.10×10⁻⁵ . What happens when calcium and sulfate solutions are mixed to give 2.00×10⁻³ and 3.00×10⁻² ?

6.)Part A

The addition of which of the following substances will not affect the existing equilibrium in a HF solution?

7.)Part A

Calculate the pH of a solution that is 0.27 M in HF and 0.11 M in NaF.

Express your answer using two decimal places.

when you would want to use collision theory over transition state theory and when you would want to use transition state theory over collision theory. Provide examples for both. Use literature citations to support your information. Follow the same formatting as requested in the group project reports.

Which of the following buffer systems would be the best choice to create a buffer with pH = 9.00? HF/KF HNO2/KNO2 NH3/NH4Cl HClO/KClO

For the best system, calculate the ratio of the masses of the buffer components required to make the buffer. Express your answer using two significant figures.

Comparison of Fresh and Sour Milk

pH of fresh milk:

pH of sour milk:

Which type of milk has the lower pH?

The greater acidity?

The greater H+ concentration. What organic (carboxylic) acid produces the H+ in sour milk? What is its source?

(5)

Chloroacetic acid, HC₂H₂ClO₂, has a greater acid strength than acetic acid because the electronegative chlorine atom pulls electrons away from the O-H bond and thus weakens it. Calculate the hydronium ion concentration and the pH of a 2.49E-3 M solution of chloroacetic acid. K_a is 1.3E-3.

[H₃O⁺] = _____ M

pH = _____

Arsenic is a toxic metal that can be found in the water supply. Begin a discussion on arsenic in water by answering the following questions: What are the current federal standards for arsenic in drinking water? Is this standard the same for arsenic in drinking water in Europe? How does arsenic in water affect the body? What are some side effects?

1. Write the net ionic equation for the reaction that occurs when equal volumes of 0.256 M aqueous hypochlorous acid and sodium fluoride are mixed (there should be 2 spots before and after arrows)

at equilibrium is it product or react favored

and is the ph <, =, or > than 7?

2. Write the balanced NET IONIC equation for the reaction that occurs when hydrochloric acid and potassium cyanide are combined. (there should be 2 spots on both sides of arrows)

Also, is the reaction classified as: strong acid + strong base, weak acid + strong base, strong acid + weak base, or weak acid + weak base?

The extent of this reaction is: below 50, 50, above 50, or 100%?

3. Write the balanced net ionic equation for he reaction that occurs when acetic acid and barium hydroxide are combined. (2 on the left and 3 spots on the right of arrows)

Also, is the reaction classified as: strong acid + strong base, weak acid + strong base, strong acid + weak base, or weak acid + weak base?

The extent of this reaction is: below 50, 50, above 50, or 100%?