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

The vapour pressures of acetone and benzene at 65^oC are 580mmHg and 475mmHg respectively

if 5.8g of acetone is mixed with 15.6g of benzene what is the total vapour pressure at 65^oC

Will this mixture distill at 65^oC? Explain

Please give answer and explanation !

Consider the following reaction: CH4 (g) + 2O2 (g)----------} CO2(g) + 2H20(g) ^Hr= -890 kj

a) is heat absorbed or evolved in the course of the reaction?

b) Calculate the amount of heat trasnferred when 45g of CH4 is decomposed by this reaction at constant pressure.

c) For the given sample of CH4 the enthalpy change on reaction is 66.8 kj. How many grams of H2O are produced?

d) what is the value of ^Hr for the reverse of the previous reaction? How many KJ of heat are released when 27g of H2O reacts completely with CO2to form CH4 and O2 at constant pressure?

Calculate the pH for each case in the titration of 50.0 mL of 0.200 M HClO(aq)0.200 M HClO(aq) with 0.200 M KOH(aq).0.200 M KOH(aq). Use the ionization constant for HClO.HClO.

What is the pH before addition of any KOH?KOH?

pH=pH=

What is the pH after addition of 25.0 mL KOH?25.0 mL KOH?

pH=pH=

What is the pH after addition of 35.0 mL KOH?35.0 mL KOH?

pH=pH=

What is the pH after addition of 50.0 mL KOH?50.0 mL KOH?

pH=pH=

What is the pH after addition of 60.0 mL KOH?60.0 mL KOH?

pH=pH=

https://sites.google.com/site/chempendix/ionization

For the following question, please explain specifically what it is you're doing for each step/where your number is coming from (ex.: 1. calculating molar mass... 2. Diving by moles...etc)... This will help me better understand how to solve the problem... thank you!

1a) Adipic Acid contains 49.84% O, and 6.85% H by mass. What is the empircal formula?

1b) The chemical process of rust is described by the following equation:

4Fe (s) + 3O2 (g) --> 2Fe2O3 (s)

The maximum of rust that can be produced from 56 g Fe and 32 g O2 is?

1. Write chemical equations to illustrate the reactions of bromine with cyclohexane, toluene, chlorobenzene, and cyclohexane (NR if no reaction)

2. What type of reaction is occurring between cyclohexane and potassium permanganate? What is the brown precipitate formed from the reaction?

3. You may have seen some reactions of bromine with toluene. Compare this with your observations of the reaction of bromine with chlorobenzene. Based on the structure of toluene where do you think the reaction occurred (aromatic ring or side chain)? Is this reaction similar to the reaction of bromine with an alkane or an alkene? Explain.

Calculate the pH of the resulting solution if 35.0 mL of 0.350 M HCl(aq) is added to

(a) 45.0 mL of 0.350 M NaOH(aq).

pH=

(b) 25.0 mL of 0.450 M NaOH(aq).

pH=

8A : Consider the titration, 10 mL of NaCN(Ka=4.9X10^-10) with .380M HCl. Calculate pH at 0.0mL HCl, 11.82mL HCl.

8B How many mL HCl is needed to reach the equivalence point and what is the pH at this point?