The bond disssociation of O₂ is 498kJ/mol (i.e., it requires 498 kJ to take one mole of O₂ molecules and break the bonds to make two moles of O atoms). What wavelength photon, in nm, would posess the minimum energy to break one O₂ molecule into two O atoms?

What does Retention Factor (Rf) mean if its high or low?

For instance, if red dye in water has a high Rf compared to propanol and NaCl, does that mean water is the best solvent to remove red dye from clothing?

1.0 mol of Cu(NO3)2 is dissolved in 1000 g of water. What is the molality of the solution for use in colligative property equations? The answers are 1, 2, 3, 4, or cannot be determined.

A 1.00 L buffer solution is 0.150 M CH3COOH (pKa = 4.74 ) and 0.200 M NaCH3COO. What is the pH of this buffer solution after 0.0500 mol KOH are added?

Calculate the time of arrival of singly charged cations with masses 14, 15, 28, 32, 550, and 551, when the ions are accelerated with 10,000 V and distance to the detector is 1m

With the aid of a simple schematic describe the principle of operation of a linear time of flight mass analyzer (LTOF).

Which statements regarding weak bonds are true?

A) Represent the bonds that hold water molecules together in liquid state

B) Are what hold the three-dimensional structures of proteins, nuleic acis, and lipid membranes together

C) sre ofter electrostatic (Involving charges particles or regions) in natre

D A&B

E) A B & C

If the mixing ratio of carbon dioxide is 404 ppmv and the number density of air is 2.69x10²⁵ molecules m^-3, determine the mass density.

Question 24 options: show work

Assuming that 1.00 L of 4% PVA solution is spread out to form a thin sheet of thickness equal to the average length of a PVA strand, calculate the total area of the liquid sheet. Then calculate the average of the sheet of solution per strand of PVA. Assuming this area is a little square, the square root of this area gives the edge length of the square which is approximately the average distance between the PVA strands. Show that this distance is about ten times the estimated diameter of a PVA strand (0.2-0.3 nm).

why does cross linking affect solubility, melt viscosity, recyclability, modulus, and service temperture?

What is the pH when 50 ml of 0.040 M NaOH is mixed with 50 ml of 0.040 M HN3 (Ka= 1.9*10^-5)

Exactly 47.0 mL of 0.2 M HNO₂ are titrated with a 0.2 M NaOH solution. What is the pH at the equivalence point ?

Balance the following equation, remove all mole fractions

C₅H₁₂O + K₂Cr₂O₇ + H₂SO₄ = Cr₂(SO₄)₃ + C₂H₄O₂ + K₂SO₄ + H₂O

I need the half reaction 1, half reaction 2, and the complete balanced equation (with K⁺ and SO₄^2-)

Please explain your steps, I'm trying to study for a test and I'm not sure how to go about this. Thank you!

other than a counterfeit detection pen, how is chemistry being used in counterfeit money detection , and give details about preventative measures that involve application of chemistry