calculate the freezing point of water (Kf= 1.86 C/m) for an ideal solution of sodium phosphate which has a concetration of 3.25 m .

How many of the following responses are true?

1. A primary alkyl halide will tend to react through an SN2 mechanism because there is little hindrance to backside attack and a primary carbocation is not very stable
2. 3-bromo-3-methylpentane will undergo substitution through an SN2 mechanism
3. If R-2-bromopentane is allowed to react with OH- the product will be S-2-pentanol
4. SN1 leads to a racemization of sterechemistry due to the nucleophile attacking from the backside and the leaving group leaving
5. SN2 leads to a racemization of sterechemistry due to the nucleophile attacking from the backside and the leaving group leaving

I thought 1, 3, and 4 were right, but my answer was wrong! Please help!

The Hohenberg-Kohn theorems show a one-to-one mapping between the density and the molecular Hamiltonian. What information is contained in the Hamiltonian and, conceptually, how can this information be extracted from the density?

Calculate the pH after adding 10.00 mL of 0.15 M HCl to 50 mL of the ammonia/ammonium ion buffer solution with a ph of 4.82

Describe the biochemical mechanism of kidney damage of untreated diabetic people

The alkalinity of natural waters is usually controlled by OH- , CO3 2- , and HCO3 - , which may be present alone or in combination. Titrating a 100.0 mL sample to a pH of 8.3 requires 18.70 mL of a 0.0281 M solution of HCl. A second 100.0 mL aliquot requires 48.20 mL of the same titrant to reach a pH of 4.5. Calculate the concentrations of CO3 2- and HCO3 - in ppm.

A sample of metal with a mass of 350 g is heated to 100 degrees celcius and dropped into 400 g of water at 21.4 degrees celcius. The temp of the water rises to 28.0 celcius. Assume no heat is lost to the environment.

What is the amount of heat gained?

What is the specific heat of the metal?

Find the fraction of dissociation, α of an aqueous 0.400M triethylamine [(CH₂CH₃)N] solution.

The total mass of DNA in the body is 50.0 g. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 10⁶ , and the average length of a single nucleotide is 0.34 nm, what is the length (in km) of one strand of DNA when it is stretched out to its maximum length (not in a helix)?

Describe how the ionization energies of main group elements vary across a period in the periodic table, using a diagram if necessary.

a, Write the equation for the first ionization of potassium

What are the major developments in Novel hybrid inorganic - organic polymer systems in the last 10 years?

A)   When 155 mL of water at 26 degrees Celsius is mixed with 25 mL of water at 85 degrees Celsius what is the final temperature? (Assume that no heat is released to the surroundings, d of water = 1.00 g/mL

B) Use twice the volume of each water sample. Calculate final temperature.

C) Instead of 75 mL, use 150 mL.  Calculate final temperature.

D) Instead of 75 mL, use 25 mL.  Calculate final temperature.

E) Discuss your results. How did the different volumes affect the final temperature?

A buffer is made from 3.7 ?? 10?1 M of HC2H3O2 and 2.9 ?? 10?1 M of NaC2H3O2

a. What is the pH?

b. If you added 3.0 ?? 10?3 moles of NaOH to 0.100 L of buffer what is the final pH. (assume that any change in volume is negligible.)

How long would it take to deposit 500 g of silver metal from a solution containing Ag+ ions using a current of 3.00 amperes? If the same time was spent depositing gold metal from a solution containing Au3+ ions using the same current, how much weight would of gold would be deposited? If you had 23 spoons that you wanted to coat with either silver or gold, and each spoon had a surface area of 150 mm2, how thick a coating could you make with each metal (for the same time spent in the electrolysis bath)? The density of silver is 10.5 g/mL and the density of gold is 19.3 g/mL.

3).The photosynthesis reaction is 6CO2 (g) + 6H2O (g) (Arrow) C6H12O6(s) + 6O2 (g). If the reaction requires 2.82 x 10^3 kJ/ mole of C6H12O6 formed: a.) How many grams of C6H12O6 can be produced from 4.20 x 10^4 kJ? b). How much energy is required to produced 250g of C6H12O6? c.)How many liters (at STP) of O2 are produced with 250g of C6H12O6? ͢͢͢͢͢

4.) Given the equation; N2 (g) + 3H2(g) (arrow) 2NH3(g). If 7.00L of N2 ( at STP) reacts with 15.0 L of H2, A.) How many L of NH3 is formed? B.) How many L of the excess gas remains unreacted? C.) How many grams of NH3 are formed?

2.) Place the following sets of elements in order of increasing size and give rational for answer . [Al, P, Na, Ar], [Ca, I , P, Br].

3.) Lead and Carbon are in the same column and therefore have the same electron configuration ending. Briefly explain why Carbon is a non metal and Lead is a metal.