Unknown A

Benedict’s Test: Bluish color

Seliwanoff’s Test: Red

Fermentation Test: Bubbles

Iodine Test: no color change

Unknown A is _______because_______________.

Unknown C

Benedict’s Test: Red-orange precipitate

Seliwanoff’s Test: no color change

Fermentation Test: Bubbles

Iodine Test: no color change

Unknown C is _______because_______________.

Unknown E

Benedict’s Test: Blue-green color

Seliwanoff’s Test: no color change

Fermentation Test: Bubbles

Iodine Test: Purple/Black color

Unknown E is _______because_______________.

Unknown G

Benedict’s Test: Yellow/orange precipitate

Seliwanoff’s Test: Red

Fermentation Test: Bubbles

Iodine Test: no color change

Unknown G is _______because_______________.

Unknown K

Benedict’s Test: Yellow/orange precipitate

Seliwanoff’s Test: no color change

Fermentation Test: No Bubbles

Iodine Test: no color change

Unknown K is _______because_______________.

Does either Ar or CO absorbs thermal IR?

which of the greenhouse gases absorbs thermal IR?

what are the two main anthropogenic sources of carbon dioxide in the atmosphere?

what are the two main sinks of atmospheric carbon dioxide?

If the cell potential for a voltaic cell is 0.250 V, and the reduction potential for the oxidation reaction is ⎯0.150 V, what is the reduction potential for the reaction occurring at the cathode?

The data below relate to the adsorption of N2 on rutile (TiO2) at 75 K. Confirm
that they fit a BET isotherm in the range of pressures reported, and determine Vmon
and c.

p/kPa 0.160 1.87 6.11 11.67 17.02 21.92 27.29
V/cm3 235 559 649 719 790 860 950

At 75 K, p* = 76.0 kPa. The volumes have been corrected to 1.00 atm and 273 K and
refer to 1.00 g of substrate

how do I know the intercept without graph excel in exam ?

1. You dissolve 5.00 g sodium hydrogen oxalate (NaHC2O4 ) in suffircient water to produce a final solution volume of 100.0 mL. Assuming all of the solid dissolves, calculate the pH of this solution.

2. You dissolve 5.00 g of sodium oxalate (Na2C2O4) in sufficient water to produce a final solution volume of 100.0 mL. Assuming all of the solid dissolves, calculate the solution pH of this solution.

3. You dissolve 5.00 g of sodium hydrogen oxalate and 5.00 g sodium oxalate in sufficient water to produce a final solution volume of 250.0 mL. Assuming both solids dissolve completely, calculate the pH of this solution.

4. Calculate the pH of the solution prepared in question #3 after 2.00 mL 1.00 M sodium hydroxide is added to it.

5. You dissolve 5.00 g sodium hydrogen oxalate and 1.00 g sodium hydroxide in sufficient water to produce a final solution volume of 250.0 mL. Assuming both solids dissolve completely, calculate the pH of this solution.

6. Calculate the pH of the solution prepared in question #5 after 2.00 mL 1.00 M hydrochloric acid is added to it.

Assume that at the start of the reaction ΔG is a large negative number. As the reaction proceeds toward equilibrium, which of the following are true?

1. The value of Q approaches the value of Keq.
2. The rate of the forward reaction is slowing down as the rate of the reverse reaction is speeding up.
3. The value of Q decreases.
4. The value of Keq decreases.
5. The value of Delta G° increases.
6. The value of Delta G° approaches the value of Delta G.
7. The value of Delta G increases.

Calculate the percent ionization of a 0.175 M hypobromous acid in pure water and in a 0.125 M potassium hypobromite solution. Explain (using a few sentences) why the percent ionization is different. The ionization constant for hypobromous acid is 2.8 x 10-9.

Calculate the pH at the equivalence point in titrating 0.047 M solutions of each of the following with 0.019 M NaOH.




(a) hydrochloric acid (HCl)

pH =  



(b) boric acid (H₃BO₃), K_a = 5.8e-10

pH =  



(c) arsenous acid (H₃AsO₃), K_a = 5.1e-10

pH =  

1. Carefully work through the sample calculations for this lab ON PAPER. Then, set up the same equations on a separate sheet of paper, but replace the values in the ‘Sample Calculations’ folder with the ones provided below and complete the calculations:

Mass of Zinc = 0.0928 g

H₂ volume reading from the eudiometer tube = 35.98 mL

Water bath temperature = 19.9 °C

Barometric pressure = 768.2 mm Hg

Level (pressure) difference from the meter stick = 41.20 cm H₂O (Pay attention to this unit!)

Note: to calculate the vapor pressure of water from the temperature given above, use the equation provided in Part 1 of the procedure.

b.) After completing your work on paper, record your answers below:

Vapor pressure of water =

Level difference in mm Hg =

H₂ partial pressure =

H₂ volume at STP =

H₂ moles =

H₂ molar volume at STP =

Before clicking on "Submit," verify that all your units are in place and that your significant figures / digits of precision are correct.

what is the rate determining step?

If you excite a fluorescent sample with light of 310 nm, in addition to the peaks from the light emitted by the molecule of interest, at what other wavelengths (in nm) would you expect to see peaks in the spectrum? Why?

The hydrolysis of the sugar sucrose to the sugars glucose and fructose, C12H22O11+H2O⟶C6H12O6+C6H12O6 follows a first-order rate law for the disappearance of sucrose: rate = k[C12H22O11] (The products of the reaction, glucose and fructose, have the same molecular formulas but differ in the arrangement of the atoms in their molecules.) (a) In neutral solution, k = 2.1 × 10−11 s−1 at 27 °C and 8.5 × 10−11 s−1 at 37 °C. Determine the activation energy, the frequency factor, and the rate constant for this equation at 47 °C (assuming the kinetics remain consistent with the Arrhenius equation at this temperature). (b) When a solution of sucrose with an initial concentration of 0.150 M reaches equilibrium, the concentration of sucrose is 1.65 × 10−7 M. How long will it take the solution to reach equilibrium at 27 °C in the absence of a catalyst? Because the concentration of sucrose at equilibrium is so low, assume that the reaction is irreversible. (c) Why does assuming that the reaction is irreversible simplify the calculation in part (b)?

Calculate your individual fluid needs in cups per day. How did you arrive at your answer? Why is hydration so important to our survival? What is effect of electrolytes on your water intake ?

what happens when we drink too much water or too much alcohol? what happens to the body? How do we recover after an incident? What are scenarios and importance of electrolytes?

THERMODYNAMIC PROPERTY RELATIONS

1. Derive expressions for (a) ∆u, (b) ∆h, and (c) ∆s for a gas that obeys the van der Waals equation of state for an isothermal process.

2, Estimate the specific-heat difference cp - cv for liquid water at 15 MPa and 80°C.