The temperature of 500 mL of distilled water in a flask is between 70°C and 90°C. Room temperature is 20°C. the useful range of the only thermometer available is between 0°C and 50°C. Briefly describe an experiment you could carry out which would allow you to determine exactly the temperature of the water in the flask. Indicate the following in your description:

What equipment would you use?

What would you do?

The equation(s) for any calculation(s) you would carry out, and which quantities would be measured, which would be calculated, and which would be constants.

You have been given the basic connectivity of two boron compounds. Complete the Lewis structures by adding lone pairs and/or multiple bonds where necessary. If there is more than one possible structure, draw the structure that minimizes nonzero formal charges and fulfills the bonding preferences for each atom.

A. B2CO, with connectivity BBCO, as shown.

B-B-C-O

B.C2B2O2, with connectivity OCBBCO as shown

O-C-B-B-C-O

How does NMR allow us to understand the connection between bond rotation and the kinetic energy within the sample being analyzed?

Background info: in this lab DEET or N,N-diethyl-m-toluamide is synthesized using the Schotten-Baumann synthetic method using m-Toluoyl chloride abd diethylamine solution

pick one of the transition element and talk about the element's physical, chemical properties, preparation, discovery, and industrial application of that element

Calculate the PH after the addition of 0.00, 5.00, 15.00, 25.00, 40.00, 45.00,49.00, 50.00, 51.00, 55.00 and 60mL of 0.100M HCl in the tirtration of 50.00mL of 0.100M weak Monoprotic base B. Kb of B is 9.52 *10^-7

Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But at high temperatures, the reaction below can proceed to a measurable extent. N2(g) + O2(g) ⇔ 2 NO(g) At 3000 K, the reaction above has Keq = 0.0153. If 0.1852 mol of pure NO is injected into an evacuated 2.0-L container and heated to 3000K, what will be the equilibrium concentration of NO?

1. What is the total number of electrons that occupy a shell, n?

2. List the relative energies for the different subshells.

3. What are the relative energies of orbitals within a shell?

4. How many electrons can be accommodated in each orbital orientation?

5. How many s-orbitals are there in a shell?

6. How many p-, d- and f- orbitals are there in a given shell?

7. What is an abbreviated or condensed electron configuration?

8. Why is it important to identify valence electrons?

9. Define:

-Transition metals

-Main group elements

10. How do metallic behavior and electron configuration relate?

11. How does one specifically determine the anomalous configurations of transition

and inner transition elements?

12. How does electron configuration relate to atomic properties?

13. What is the atomic radius (bonding atomic radius or covalent radius)?

14. What must you consider when comparing atoms for size (radius)?

15. What is ionic radius?

16. What must you consider when comparing ions for size?

17. How do you determine the magnetic properties of an atom?

18. What are successive ionization energies?

19. What are the trends in the second ionization energy?

20. What is oxidation? Reduction?

21. What is the trend for metallic reactivity? What is its trend on the periodic table?

22. What is the trend for the nonmetallic character? What is its trend on the periodic

table?

23. What is electronegativity? What is its trend on the periodic table?

Determine the volume (in mL) of 0.442 M potassium hydroxide (KOH) that must be added to 475 mL of 0.0992 M ascorbic acid (C₅H₇O₄COOH) to yield a pH of 3.89.



Assume the 5% approximation is valid and report your answer to 3 significant figures. A table of pKa values can be found here.

You have solid calcium carbonate and inorganic carbon in equilibrium in a lake at pH 7. Use equilibrium calculations to show that due to this equilibrium the calcium concentration is ~0.5 mM.

Write the balanced overall reaction from these unbalanced half-reactions

I have a couple of pre lab questions regarding N-phenylmaleimide.

1) why it is necessary to prevent N-phenylmaleimide from overheating when recrystallizing???

2) what would be the precautions, in terms of reagents, to be taken in consideration for the preparation of N-phenylmaleimide???

3) what is the reaction solvent for preparing N-phenylmaleimide from maleanilic acid?? what is the recrystallization solvent of this??

*there is no data these are pre-lab worksheet 

draw the hybrid structure of the cyclopentadienyl anion that ligates to the iron in ferrocene and acetylferrocene. draw three of the possible five resonance structures which aid chemists in understanding the distribution of charge by starting with one possible lewis structure and using curved arrow notation to show the movement of electrons to the next. Classify the anion as "aromatic ," anti-aromatic, or non-aromatic

A 5.00 g sample of H2O is removed from a freezer and heated from an initial temperature of -5.00 oC through to a final temperature of 102.0 oC.

(a) Given the following data, calculate the amount of energy that has to be absorbed by the H2O during the whole process.

Freezing point of H2O = 0.00oC;

Boiling point of H2O = 100.oC

ΔHfusion of H2O = 6.01 kJ mol-1

ΔHevaporation of H2O = 40.7 kJ mol-1

Specific heat capacity of ice = 2.05 J g-1 K-1;

Specific heat capacity of water = 4.18 J g-1 K-1

Specific heat capacity of steam = 2.08 J g-1 K-1

(b) Calculate the percentage of the total energy required for the overall process in (a) that is used just in heating the liquid water.

(c) Calculate the mass of ice at 0.00oC, that can be melted in 30 minutes by a heater that produces 8000 kJ of energy per hour but in such a way that only 70% of the heat produced is absorbed by the ice.

Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small? (Ka for HF is 6.8×10−4.)

a) 0.260 M

b) 4.80×10⁻² M

c) 3.00×10⁻² M