Account for the following observations:

The NH2CH2CH2CH2NH2 is a good bridging ligand, but it is not a bidentate chelate ligand.

Syrup is made of equal parts of water and sucrose. Mass of 1 cup of sucrose is 200.0g and mass of 1 cup water is 220g. what temperature will the syrup boil and freeze?

A buffer consists of 0.91-M propanoic acid ( Ka= 1.4 × 10^-5) and 0.76-M sodium propanoate.

a) Calculate the pH of this buffer.

b)Calculate the pH after the addition of 1.2 mL of 0.10–M HCl to 0.010 L of the buffer.

c) Calculate the pH after the addition of 1.8 mL of 1.0–M HCl to 0.010 L of the buffer.

Clearly and completely describe a simple, ONE step (a single reagent added) test that would allow you to distinguish between the following:
a) Bi(OH)3 and Al(OH)3

b) Pb2+(aq) and Fe3+(aq)

Consider a helium ion He+.

a) Find the ratio between the ionization energy of the H atom and and the He^+ ion.

b) How does the Bohr radius, we defined for H atom, differ for He^+ ? Using the Bohr radius of He^+ and the representation of the ground state wave function for the H atom, write the ground state wave function for the He^+.

c) Find the average distance of a 1s electron from a nucleus in He+ ion. How does it compare with the Bohr radius you found in (b) for H atom and He^+ ion?

d) Find the most probable value of r characterizing the distance between a 1s electron and the nucleus in the He^+ ion. Compare your answer with (c) and discuss a physical meaning of obtained results.

e) Find the average distance of 2pz electrons from a nucleus in He+ ion. Compare your results with those for a 1s electron in (c). Are you surprised by the answer?

f) How your answer in (e) would be different, if you find the average distance of 2px electrons, instead of pz?

The pH of a 0.392 M solution of the conjugate base, A-, of a weak acid, HA, is 11.60. What is the K_b for A-?

Please show work

Other then a COUNTERFEIT DETECTION PEN , HOW chemistry is being used in money detection and WHAT other chemical application can be used to prevent counterfeit currency from circulation.

At 1177 K the partial pressures of an equilibrium mixture of H2O, H2 and O2 are 0.0340, 0.0035 and 0.0013 atm, respectively. Given that the chemical equation for the equilibrium is, 2 H2O(g) <----> 2 H2(g) + O2(g) calculate Kp and Kc.

1) Oxidation refers to...
a) an increase in Oxidation number. b) a decrease in Oxidation number. c)an increase in atomic number. d) an increase in mas.

1. The molar mass of a compound is 126 g/mol, and it's empirical formula is C2H2O. What is compound's molecular formula?

2. A compound consist of 26.18g Si and 29.82g O. Calculate its empirical formula?

3. Calculate the empirical formula of the compound that consist of 70.4%F and 29.6%O.

1. Which assay is more likely to be accurate for BSA concentrations: ninhydrin or Bradford, and why?
2. (a) Tell me the different forms of Coomassie Blue at different pH's (b) Tell me what causes Coomassie Blue in acid to change its color when meeting a protein. (c) Tell me to which parts of a protein molecule the Coomassie Blue binds.  

C: CaCO3 (s) ----> CaO (s) + CO2 (g) delta H= +178 kJ/mol
D: PCl3 (g) + Cl2 (g) -----> PCl5 (g) delta H= - 88 kJ/mol

Classify these changes as either LEFTWARD SHIFT, RIGTHWARD SHIFT, or NO SHIFT

System C increase temperature
System C decrease temperature
System D increase temperature
System D decrease temperature

What products result when calcium carbide is combined with water?

Molarity of standard NaOH solution: x/1 H 2/3 Unknown + 2/3 NaOH -> 2/3 H2O +Na 2/3 Acetate

Unknown Acid code and number of reactive hydrogens: H+3

4. Find the molarity of the vinegar for each of your three vinegar titrations, then find the average molarity of the acid.

5. Find the percent deviations for your three vinegar molarities for the vinegar titrations.

6. From the moles of acetic acid for each vinegar titration, find the mass of acetic acid for that titration