1) The percent ionization of a certain weak acid is 3.14%. If the starting concentration of the acid is 0.55 M, what is the Ka of the acid?

2) What is the pH of a buffer made by mixing 575 mL of 0.150 M potassium acetate with 450 mL of 0.225 M acetic acid (Ka = 1.8 × 10^–5 )?

3. Liquid Coffee Mate has many ingredients including corn syrup solids, vegetable oil, and sodium caseinate (a milk derivative). Classify each of these substances into the following categories of macromolecules: carbohydrates, lipids, or proteins. Which substance(s) is/are responsible for the result you obtained with the biuret reagent?

4. Research the substance pepsin. What is it used for? If you were to test the enzyme amylase, what result would you expect with the biuret reagent? Why?

5. You enjoy the following snack one afternoon: a can of Pepsi, pretzels, and sliced apples with peanut butter. Would any of these four food items yield a positive result with biuret reagent? If so, which one(s) and why?

Determine the pH during the titration of 24.8 mL of 0.475 M nitrous acid (K_a = 4.5×10^-4) by 0.361 M NaOH at the following points.

(a) Before the addition of any NaOH __________

(b) After the addition of 8.20 mL of NaOH __________

(c) At the half-equivalence point (the titration midpoint) ________

(d) At the equivalence point __________

(e) After the addition of 48.9 mL of NaOH __________

Carbon-14 decays as follows:

_{14 0            14}

                              C   ----> e   + N   

^{6 -1              7}

   isotopic masses are 14.00307 for nitrogen-14 and 14.00324 for carbon-14. What energy change (kJ/moles) occurs in the beta decay of C-14? NOTE: Do I use these two masses to get the mass defect or do I use the mass of protons and nuetrons to find the mass defect of each one and then subtract the two?

Give representative chemical formulas for the three principal types of fossil fuels.

Write a balanced chemical reaction converting each fuel to CO2 and water.

Using the equation calculate the grams of CO2 emitted per gram of fuel burned.

Calculate the enthalpy of the reaction

2NO(g)+O2(g)?2NO2(g)

given the following reactions and enthalpies of formation:

12N2(g)+O2(g)?NO2(g),   ?H?A=33.2 kJ

12N2(g)+12O2(g)?NO(g),  ?H?B=90.2 kJ

Express your answer with the appropriate units.

Part B

Calculate the enthalpy of the reaction

4B(s)+3O2(g)?2B2O3(s)

given the following pertinent information:

B2O3(s)+3H2O(g)?3O2(g)+B2H6(g),    ?H?A=+2035 kJ

2B(s)+3H2(g)?B2H6(g),                            ?H?B=+36 kJ

H2(g)+12O2(g)?H2O(l),                ?H?C=?285 kJ

H2O(l)?H2O(g),                                          ?H?D=+44 kJ

Express your answer with the appropriate units.

i want a definition on lipids trans fats and hydrogenation what they do and there formulas

1. When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 11.14 g of CsBr(s) are dissolved in 119.50 g of water, the temperature of the solution drops from 22.60 to 19.51 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.61 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of CsBr(s) in kJ/mol. Assume the specific heat of the solution is equal to the specific heat of water. ΔHdissolution = kJ/mol

2. When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 11.83 g of CsCl(s) are dissolved in 115.50 g of water, the temperature of the solution drops from 22.20 to 19.26 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.51 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of CsCl(s) in kJ/mol. Assume the specific heat of the solution is equal to the specific heat of water. ΔHdissolution = kJ/mol

Determine the concentrations of Pb2 and Br– in a saturated solution of PbBr2 in:

a) pure water (assume μ = 0).

b) a solution with an ionic strength of 0.010.

c) a solution with an ionic strength of 0.10.

A liquid ink is yellow and placed in a cuvette, colored optical filters are placed infront of the LED light and the light hits the ink cuvette. The intensity of the fluorescence is recorded for each color of optical filter placed infront of the LED

Why is it that using a specific color optical filter shows maximum intensity and the rest of the colors considerably decrease the fluoresence emission? breifly explain

Given the DOSY nmr spectrum the mixture of Glucose, Maltose, and Dextran 70 with solvents are DMSO and CDCl3. Can anyone show me how to plot and determine the linear trend between diffusion coefficient and the viscosity of solvent.

Then calculate the viscosity of the unknown containing a mixture of the two known solvents from the value of the unknown diffusion coefficient and the linear trend you established. Finally, from the calculated viscosity, determine the ratio of the solvents in the unknown sample.

Thank you!

cisplatin(or cis- diamminedichloroplatinum(II) is an anticancer drug. The trans isomer, however has no effect. how does cisplatin funtion to kill tumors?

Consider four possible liquid fuels used in vehicles.

• C8H18 Octane - gasoline

• C12H26 Dodecane - diesel

• CH3OH ethanol - gasoline additive

• CH3NO2 nitromethane - racing fuel

Determine the heat released upon combustion with O2 for 15 gallons of each fuel.

Hint: Perform the following.

1. Balance the combustion reaction for each fuel. The products are CO2(g), H2O(g); for nitromethane, N produces N2(g) as one of the products.

2. Determine the enthalpy of each combustion reaction.

3. Determine the enthalpy of combustion for 15 gallons of fuel reactant.

4. Which fuel gives the most heat upon combustion?

5. Does adding ethanol to gasoline increase or decrease gas mileage?