for azo dyes, why does an instantaneous and dramatic color change occur when the two coupling reagents are mixed together?

fter thoroughly reviewing the physical process of capillary action and surface tension and viscosity, write a thoughtful, complete, but concise response to the following: Explain how capillary action is used to transport water and nutrients in trees. Explain how surface tension and viscosity are used to transport water and nutrients in trees.

Given what you know about the pharmacophore of morphine (ie draw the new compound) that will convert the compound from an agonist (morphine) to an antagonist (your experimental compound).

A student needs 62.5 g of zinc sulfide, a white pigment, for an art project. He can synthesize it using the reaction: Na2S (aq) + Zn(NO3)2 (aq) = ZnS(s) + NaNO3 (aq) (not balanced) (78.04) (189.4) (97.44) (85.00) How many grams of zinc nitrate will he need if the percent yield of zinc sulfide is 85.0 %?

If 0.175 L of 0.364 M ammonia solution is titriated with 0.095 L of 0.35 M HCI, what is the pH of the resulting solution?

What is the constituent particle, bond type, texture (hard, soft, brittle, malleable, ductile), conductivity, melting point (high, intermediate, low, variable), solubility of:

Molecular Solids

Covalent Network Structures

Ionic Networks

Metallic Networks

Discrete Molecules

Extended Structures

what is the difference between an amorphous, an oriented, and a crystalline plastics?

1)Put the following chromatography solvent in order of polarity as a chromatography solvent: acetone, n-propanol, water, hexane, diethyl ether, methanol.
2) You will be doing chromatography with a mixture of n-propanol and water. Would it make sense to add
hexane to this mixture to try and make it work better? Explain.
5) Two cars full of people took a day trip. Car A had a lot of little kids and stopped at lots of rest stops and
gas stations to give them a break. Car B had just adults in it, and only stopped once. Of course Car B got
to the destination first. Explain how this in an analogy for the chromatography you are doing in this
experiment.
help please

1) a) How would you make 600 ml of a 0.25 M ammonia and 0.20 M ammonium nitrate from a bottle of 6.0 M ammonia (aq) and a bottle of solid ammonium nitrate.

grams of ammonium nitrate?
   mL of ammonia?
mL of H2O?

   b) Calculate pH (Kb = 1.8 x 10^-5)

2) How many mL of Acid (12 M HCl) or base (12 M NaOH) would you need to shift the pH 0.5 increments down?

1. Calculate the concentration of the AgNO3 solution.

2. Use your AgNO3 concentration to determine the concentration of the KSCN titrant from your standardization titrations. (See Equation 6-1)

3. Determine the amount of excess Ag+ remaining in the filtrate of your unknown solutions:

a. Equation 6-1 shows the stoichiometry for this reaction.

Ag+ + SCN- --> AgSCN

b. Use the volume of KSCN used, along with the true concentration of KSCN you determined, to find the moles of Ag+ remaining in solution after the reaction with chloride.

c. Use the concentration of AgNO3 to determine the total moles of silver you added to the reaction.

d. The difference between the values you determined in b and c equals the total number of moles of silver that reacted with the chloride in your aliquot of unknown solution.

e. Determine and report the mass% of chloride in your unknown sample.

Okay so I have my concentration of AgNO3 buthow do I use it to find the concentration of the KSCN titrant? Also How to determine the excess amount of Ag+ remaining in the filtrate of my unknown silutions?

please write it by your own.

Analysis Based [Short Answers; ANY 2 less than 100 words]
1. The foam produced by the used of detergents, is harmful to aquatic life. Explain Why?

2. What might life be like without the ozone layer?

3. What causes Air pollution? How can we reduce air pollution

4. What are the common purification techniques for Brackish or sea Water? In this region, which is the common technique employed and why

The atmosphere slowly oxidizes hydrocarbons in a number of steps that eventually convert the hydrocarbon into carbon dioxide and water. The overall reactions of a number of such steps for methane gas is
CH4(g)+5O2(g)+5NO(g)→CO2(g)+H2O(g)+5NO2(g)+2OH(g)
Suppose that an atmospheric chemist combines 145 mL of methane at STP, 885 mL of oxygen at STP, and 59.5 mL of NO at STP in a 1.8 −L flask. The reaction is allowed to stand for several weeks at 275 K .

If the reaction reaches 92.0% of completion (92.0% of the limiting reactant is consumed), what are the partial pressures of each of the reactants in the flask at 275 K ?

If the reaction reaches 92.0% of completion (92.0% of the limiting reactant is consumed), what are the partial pressures of each of the products in the flask at 275 K ?

What is the total pressure in the flask?

Using the set of smallest whole number coefficients to balance the redox equation

MnO₄^- + NO₂^- ---> MnO₂ + NO₃^-

in basic solution, you get

a) 2 OH^- on the right.

b) 3 OH^- on the left.

c) 1 H₂O on the right

d) 3 H₂O on the left

TLC analysis of an unknown sample using pure ethyl acetate as a developing solvent gives a single spot with an Rf value of 0.08.

A. Explain why this result doesn't guarantee that the sample is a pure compound.

B. Suggest two changes that could be made to the experiment to improve the analysis of the unkonwn sample.

(1)   What do you assume the entropy S for a perfect crystal when T = 0?

(2)   Is the S(0) still zero if the crystal is not perfect? Why?

(3)   How to calculate dS when under the constant pressure and c_p is given?

(4)   How to calculate the entropy of H₂O at 500 K?

(5)   How to calculate the entropy change for a chemical reaction if you can find the S for each chemical?

(6)   For an isolated thermodynamic system, dS ³ 0. That is, dS = 0 for a reversible process and dS > 0 for an irreversible process (spontaneous process).