1) Different hybridizations give rise to different vibrational frequencies. Terminal
alkynes have C-H stretching frequencies of about 3300 cm-1; alkene C-H stretching
frequencies are around 3100 cm-1, and alkane C-H stretching frequencies are
around 2900 cm-1. Explain these observations

NEED THE COMPLETE AND CLEAR SOLUTION thanks

An isotonic solution will produce an osmotic pressure of 7.84 atm measured against pure water at human body temperature (37.0 °C). How many g of sodium chloride must be dissolved in a liter of water to produce an isotonic solution?

Laboratory 11B: Methyl Orange

1) What changes to the synthetic sequence used for methyl orange would need to be made to generate FD&C Orange #1 (see lab manual for the structure). (Some structure drawings will be helpful when answering this question).

2) Some fabrics stained strongly with methyl orange while others stained poorly. Using one of the strongly stained fabrics as an example, explain what features of that material result in it being strongly stained.

3) Explain why methyl orange changes color at different pH.

Gold forms a substitutional solid solution with silver. Compute the number of gold atoms per cubic centimeter for a silver-gold alloy that contains 10 wt% Au and 90 wt% Ag. The densities of pure gold and silver are 19.32 and 10.49 g/cm3, respectively.

how would you convert potassium oleate soap to the corresponding fatty acid?

1. A certain first-order reaction (A→products) has a rate constant of 1.00×10−2 s−1 at 45 ∘C. How many minutes does it take for the concentration of the reactant, [A], to drop to 6.25% of the original concentration?

2. A certain second-order reaction (B→products) has a rate constant of 1.15×10⁻³M−1⋅s−1 at 27 ∘C and an initial half-life of 200 s . What is the concentration of the reactant B after one half-life?

please show work

Compute the approximate density of acetylene, C2H2, at 25 degrees C and 0.98 atm.

So I went through a lab experiment last week, basically, We have a mixture and we remove iron with a magnet, we than seperate naphthalene by sublimation (by heating a flask). Than we have urea which is the only component that can dissolve in water which is obtained by crystallization after seperation from the polypropylene which floats on the water and the sand which sinks.

1) Describe the prinicpal diffuclties you encountered in obtaining a clean seperation and in collecting the seperated components without loss.

I really forgot the diffuclties I ecountered, anyone got an idea?

A volume of 12.95 mL of 0.1080 M NaOH solution was used to titrate a 0.596 g sample of unknown containing K₂HPO₄.

a. What is the molecular mass of K₂HPO₄? (report answers to 4 or 5 significant figures)

b. What is the percent by mass of K₂HPO₄ in the unknown?

c. In this problem what mass of sample in grams would be needed to deliver about 22.00 mL in the next trial?

d. In the second trial above, exactly 0.996 g was transferred into a flask to be titrated. If the initial buret reading is 0.10 mL, predict what the final buret reading be.

Working on an electrochemistry lab and I need to write the following net ionic equations based on the half reactions

Mg + AlCl3; Al + Pb(NO3)2; AgNO3 + Pb; Cu + MgSO4

I am aware of the half reactions for each of the solids, which I will include, but I'm confused about writing the half reactions for the compounds

Mg(aq) + 2e- --> Mg(s)

Al(aq) + 3e- --> Al(s)

Cu2+ (aq) + e- --> Cu+ (aq)

Pb2+ (aq) + 2e- --> Pb(s)

PVA (Poly(vinyl alcohol))

1) Show that the average strand of PVA (MW 78,000) contains approximately 1800 monomer units.

2) Calculate the approximate length of PVA assuming that each monomer unit contributes two carbon atom diameters to the length (1 carbon atom diameter = 154 pm).

3) Show that 1.00 L of 4% (40g/L) PVA contains approximately 3 x 10^20 PVA strands.

When 780g of benzene (molar mass = 78g/mol) reacts with 750ml of conc. HNO3 (16M) and 750ml of H2SO4 (18M), 1000g of nitrobenzene (molar mass =123g/mol) and 250g of an unknown compound with a high boiling point are obtained. a. Identify the limiting reagent

b. Calculate the percent yield of nitrobenzene

c. Give the name of the most probable side product with the high melting point

d. Explain with the aid of a mechanism the role of H2S04 in the reaction

e. Supposing the crystalline compound 250g has the formula C6H4N2O4, calculate the yield of the side product.

How many joules of energy must be removed from 192 g of water at 23.6 C to form ice at 0 C? Significant digits is set to 3

a.Normalize the wavefunction Ψ(x) = 1 in a space of 0 ≤ x ≤ ℓ

b. Find the probability of finding the particle in the subspace [0,ℓ/2 ]

c. Find the most-likely position of the particle in entire space

d. Find the most-likely position of the particle in the subspace [0,ℓ/3 ]

Determine the rate law and the value of k for the following reaction using the data provided.

2 NO(g) + O₂(g) ? 2 NO₂(g)