matty

What is the chemical formula for oxygen

300 ML of oxygen gas at -10℃ and heated to 10℃. What is the new volume if the pressure remain constant?

How much liquid is needed to prepare 663.1mL of a solution that has a new concentration of 4.8M if the stock solution is 42.3M?

Which is and exaple of matter

Indicate which of the following factors can increase or decrease column efficiency in liquid chromatography. Give reasons in each case.

1. Very low flow rate
2. Large stationary phase particle size
3. Small stationary phase particle size
4. Regularly shaped stationary phase
5. Irregularly shaped stationary phase
6. High temperature
7. Low temperature
8. Non‐uniform stationary phase particle size
9. High diffusion coefficient in mobile phase
10. Low diffusion coefficient in mobile phase
11. Longer column
12. Large dead volume
    
    
    

The cooking of an egg involves the denaturation of a protein called albumin. The time required to achieve a particular degree of denaturation is inversely proportional to the rate constant for the process. This reaction has a high activation energy, E, =418 kJ mol. Calculate how long it would take to cook a traditional three-minute egg on top of Mt. Denali in Alaska on a day when the atmospheric pressure there is 47kPa.

Use the Bohr model from your text to calculate the expected emission lines from the H atom for the first four members in the series of emission lines listed below. Give the photon energies and wavelengths (nm) for each emission line.

Where stereoisomers of biomolecules are possible, only one is usually found in most organisms; for example, only the L amino acids occur in proteins. What problems would occur if, for example, the amino acids in the body proteins of herbivores were in the L isomer form, whereas the amino acids in a large number of the plants they fed upon were in the D isomer form? 

Part 1 Boyle’s Law P1 V1 = P2 V2 when Temperature is constant; being 1 “initial” and 2 “final” A container of oxygen gas has a volume of 150 mL when its pressure is 0.947 atm. If the temperature remains constant. What will the volume of the gas be at a pressure of 0.987 atm? Using Boyle’s Law solve for V2 of final volume using P1 V1 = P2 V2 Match the correspondent given data, unknown data and resulted in data after solved

___1. Initial Volume or V1 

___2. Final Pressure or P2 

___3. Initial pressure or P1 

___4. Final V2 

___5 Temperature 

A. does not change, remains constant

B. 144 mL of oxygen

C. 0.947 atm

D. 150 mL of oxygen

E. 130 mL of oxygen 

F. 0.987 atm

Part 2 Charles’s Law V1/T1=V2/T2 when the Pressure is constant; being 1 “initial” and 2 “final A container with hydrogen gas has a volume of 349 mL, at a temperature of 22.0C (Change to K), What volume will the gas occupy at 50C(Change to K), if the pressure remains constant?

____6. Final Volume of gas 

____7 Initial Temperature gas 

____8. Final Temperature gas 

____9. Initial Volume gas 

____10. The pressure of hydrogen 

G. It’s constant

H. 295 K

I. 349 mL

J. 382 mL

K. 323 K

L. 50 C

Part 3 Gay-Lussac Law P1/T1=P2 when the volume (V) is constant A cylinder of a gas has a pressure of 4.40 atm at 25C (Change to K). At what temperature in Celsius will it reach a pressure of 6.50 atm C= K-273

____11. Final Pressure of gas (P1) 

____12. The initial temperature in K (T1) 

____13. The initial Pressure of gas (P2) 

____14. The volume of the gas 

_____15. The final temperature of the gas  

M. 6.50 atm

N. 298 K

O. 4.40 atm

P. 167 C

Q . 283 K

R. is constant

Part 4 Combined Gas Law P1 V1/ T1 = P2 V2/ T2 OR MORE EASY TO SOLVE P1 V1 T2= P2 V2 T1 A St. Valentine Helium-filled balloon for your love, has a volume of 50.0 mL at 25 C (change to K) and 1.08 atm. What volume(V2) will it have at 0.855 atm and 10.0C (change to K). K=C + 273

_____16. The Final Temperature in K (T1) 

_____17. The initial Volume in mL (V1) 

_____18. The final Pressure in atm (P2)

_____19. The initial temperature in C (T1) 

_____20. The final volume (V2)  

S. 298k

T. 50.0 mL

 U. 0.855 atm

V. 25 C

W. 283 K

X. 60.00 mL

Part 5 Answer with the letter in the blank. A. Boyles’s Law B. Charles’s Law C. Gay-Lussac’s Law D. Combined Gas Law E. Avogadro’s Law

___21. One mol of any gas at Standard Temperature and Pressure contains 6.03 X10^23 molecules and occupy a volume of 22.4L

____22. The higher the pressure the lower the volume when the temperature is constant.

____23. The higher the temperature the higher the volume when the pressure is constant.

____24 The higher the temperature the higher is the pressure when the volume is constant.

____25. There is a relation between pressure, volume, and temperature of a fixed amount (moles)of gas

Which pair of elements has the most similar properties ( A. I and Ca, B. N and P, C. K and He, D. Li  and B

A stoppered flask at 25 ºC contains 250 ml of water, 200 ml of octanol, and 50 ml of air. An unknown amount of o-xylene is added to the flask and allowed to partition among the phases. After equilibrium has been established, 5.0 mg of o-xylene is measured in the water. What is the total mass of o-xylene present in the flask?

A 1.0 gram sample of impure K2CO3 is taken for analysis. The solution of the dissolved sample required 58.10 mLof 0.14 N HCl. However, 0.65 mL of NaOH was needed for back titration (1 mLof HCl is equivalent to 2.60 mL NaOH). Calculate the purity of the sample expressed as % K2O

To calibrate your calorimeter cup, you first put 59 mL of cold water in the cup, and measure its temperature to be 18.7 °C. You then pour 51 mL of hot water, temperature = 52.1 °C, into the cup and measure the temperature every thirty seconds over a 10 minute period. You extrapolate this "cooling curve" back to the time of addition and find that the "final temperature" after mixing is 32.3 °C.

Calculate the pH at each of the following points in the titration of 50.00 mL of 0.0100 M 
NaOH with 0.100 M HCl. Volume of acid added: 0.00, 1.00, 2.00, 3.00, 4.00, 4.50, 4.90, 4.99, 
5.00, 5.01, 5.10, 5.50, 6.00, 8.00, and 10.00 mL. Make a graph of pH versus volume of HCl

Please help me figure this question out! Thank you in advance!!

A suspect is apprehended in an assault case and is found to have smears of makeup on his clothing. The victim was known to have been wearing a distinctive pearl-white makeup. The pearl effect in cosmetics is from a bismuth compound, BiOCl. What technique in the lab would you use to detect Bismuth?

Help me please

Help me please ASAP :(!?!

Consider the reaction of each of the following with Br2/FeBr3.  Predict the products; draw all intermediates and then place in order of increasing rate of reaction!

Toluene

Nitrobenzene

Phenol

Styrene

Chlorobenzene

Methane CH4 gas and oxygen O2 gas react to form carbon dioxide CO2 gas and water H2O vapor. Suppose you have 13.0 mol of CH4 and 1.0 mol of O2 in a reactor. Calculate the largest amount of CO2 that could be produced. Round your answer to the nearest 0.1 mol.

identify the following: see attachment

A buffer solution is prepared by adding 25 mL of 0.050 M sulfuric acid solution to 50 mL of 0.10 M ammonia solution. What is the pH of the buffer?

how to convert 50 M grams of CO2 to moles

Will changing the gas chromatography column stationary phase alter separation? How?

Suppose you are making ham sandwiches for your friends. You have lots of friends, so you want to make as many sandwiches as possible. Because you are on a budget, you only have 24 pieces of bread and 15 pieces of ham. Each sandwiches consist of 2 pieces of bread and 1 slice of ham.

Which is and exaple of matter

List the name of 7 functional groups that have one or more oxygen atoms but no nitrogens. Draw a simple example of each.

Please help me

When 5.13g NaOH(s) is dissolved in 200.0mL of water, the temperature increases 6.63 celcius degrees.

Give the hybridization of the carbon, oxygen, and nitrogen atoms in each structure.

What would be the most substituted version of benzene possible when brominating it?

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 I have been assigned to write a procedure with the following instructions: 

"Design a procedure to accomplish an assigned oxidation reaction. Find and cite one or more published procedures (other than your textbook) for similar alcohols to support your proposal. Your procedure must include the choice of an appropriate, selective oxidizing agent, how you would work-up the reaction, and a method to purify the product. Finally, what techniques would you use to confirm the identity of your product? Be specific, mentioning physical properties and appropriate diagnostic spectral data."

This is based on a scale of 130 mg alcohol starting material. 

"Write this like a technical synthetic procedure in your lab textbook (1-2 paragraphs to define Experimental Procedure and Characterization, with commentary on the reaction separate). Your procedure should be written to include the specific microscale equipment and characterization techniques."

4-phenyl-3-buten-2-ol ---------> 4-phenyl-3-buten-2-one

An object has a volume of with a density of .  What is the mass of the object?

 Consider the following standard reduction potentials: Al3+ (aq) + 3 e- → Al(s) E° = -1.66 V I2(s) + 2 e- → 2 I-(aq) E° = +0.54 V Under standard conditions,

a. Al3+(aq) is a stronger oxidizing agent than I2(s), and I-(aq) is a stronger reducing agent than Al(s).

b. Al(s) is a stronger oxidizing agent than I-(aq), and Al3+(aq) is a stronger reducing agent than I2(s).

c. I2(s) is a stronger oxidizing agent than Al3+(aq), and Al(s) is a stronger reducing agent than I-(aq).

d. I-(aq) is a stronger oxidizing agent than Al(s), and I2(s) is a stronger reducing agent than Al3+(aq).

2. A standard hydrogen electrode is connected to a Ag+/ Ag half-cell. (a) In what direction do the electrons flow in the external circuit? (b) A salt bridge of NH4NO3(aq) connects the two half-cells. What happens to the ions in this solution as the cell operates? (c) Does the concentration of H+(aq) increase or decrease in the hydrogen electrode? (d) In this galvanic cell, what should be the sign of the charge marked on the hydrogen electrode? (e) Which electrode is the cathode?

Linearization Problems:

(Gravimetric Problems)

Briefly explain how the following mistakes would affect your determined pKa (or pKb) value: a. b. c. You do not transfer all the weighed acid to your flask You add 75 mL of DI water to your flask instead of the 50 mL in the procedure. Your determined equivalence point volume is greater than the true equivalence point.

Atomic chlorine is produced under ozone-hole conditions by the dissociation of diatomic chlorine, Cl Given that the AHf value for atomic chlorine is 121.7 kJ/ mol, calculate the maximum wavelength of light that can dissociate diatomic chlorine into the monatomic form Does such a wavelength correspond to light in the visible or the UV-A or the UV-B region?

In 15 L vessel 1.5 mol Co and 4.5 Mol H2  mixture react at 900 degree celcius. calculate all substance equilibrium concentration.equlibrium constant  is 3.92. reaction Co+3H2=CH4+H2O