Thursday
August 21, 2014

Posts by Lavonne


Total # Posts: 47

Immunology/ serology
What is the difference between an antigen and an immunogen? The way I'm understanding it, an antigen is a part of the immunogen but is not necessarily an immunogen in and of itself. An antigen may not be able to ellict an immune response. Is this correct?
October 6, 2011

Chemistry-PLease help!
What is the density of CO2 gas at -25.2 degrees celsius and 98.0kPa?
December 8, 2010

chemistry-URGENT!!
A sample of ammonina gas at 65.5 degrees celsius and 524 torr has avolume of 15.31 L. What is it's volume at -15.8 degrees celsius and its pressure is 524 torr?
December 8, 2010

chemistry
A sample of ammonina gas at 65.5 degrees celsius and 524 torr has avolume of 15.31 L. What is it's volume at -15.8 degrees celsius and its pressure is 524 torr?
December 7, 2010

chemistry
What is the density of CO2 gas at -25.2 degrees celsius and 98.0kPa?
December 7, 2010

Chem for final, please help!
How many moles of H+(aq) ions are present in 1.25 L of 0.75M Nitric Acid? A. 0.60 mol B. 0.75 mol C. 0.94 mol D. 1.7 mol E. 1.9 mol Please show me how to work this!
December 7, 2010

chemistry
Ok, I really need to know how to work problems like these so could someone please show me how to set it up?! Given this data: 1. C(graphite) + O2(g) produces CO2(g), delta H = -393.5 kJ 2. H2(g) + 1/2 O2(g) produces H2O(l), delta H = -285.8 kJ 3. Ch3OH(l) + 3/2 O2(g) produces ...
November 23, 2010

chemistry Please help!
I have a big exam tomorrow. Can anyone tell me any easy way to figure out the 4 quantum numbers, n, l, ml, and ms. i still get confused especially with the n and ml!
November 23, 2010

chemistry
So adding of removing the electrons gives all of them 18 elctrons like Argon except for V3+, correct? Thsi makes it the non-isoelctric species? It wasn't explained to me this way and this makes it much easier to see. Thanks!
November 10, 2010

chemistry
which of the folllowing species is not isoelctric with any of the others? a)V3+ b)Ca2+ c)Ar d)CL- e)S2-
November 10, 2010

chemistry
which of the following is not paramagnetic? a)Co3+ b)Se2- c)Gd (element 64) d)Ni e)Gd3+
November 9, 2010

chemistry
which of the folllowing species is not isoelctric with any of the others? a)V3+ b)Ca2+ c)Ar d)CL- e)S2-
November 9, 2010

chemistry
The electron configuration of the outermost electrons of the halogen group is: a)ns2np7 b)ns1 c)ns2np5 d)ns2np6(n-1)d7 e)ns2np6
November 9, 2010

chemistry
which of the following sets of quantum numbers (n,l,ml,ms) describes the electron which is most easily removed when a sodium aton is converted to a sodium ion? a)2,1,0,-1/2 b)2,0,0,-1/2 c)3,1,1,+1/2 d)3,2,1,-1/2 e)3,0,0,+1/2 can anyone explain this so I understand it?
November 9, 2010

Chemistry(I'm sooo confused here!)
The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2) a)182 nm b)103 nm c)97 nm d) 95 nm e) 91 nm I know i posted...
November 4, 2010

chemistry
According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 10(3) m/s, the uncertainty in its position is at least a)66 m b)17 m c)6.6 x 10-8 m d)1.7 x 10-8 m e)None of the above
November 4, 2010

chemistry
The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2) a)182 nm b)103 nm c)97 nm d) 95 nm e) 91 nm I was thinking ...
November 3, 2010

chemistry
According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 10(3) m/s, the uncertainty in its position is at least a)66 m b)17 m c)6.6 x 10-8 m d)1.7 x 10-8 m e)None of the above
November 3, 2010

chemistry
Thanks! That was what I thought.
November 3, 2010

chemistry
Which of the following is not a one-electron atom A) H B) He+ C) Li2+ D) Be2+ E) O7+ I know that H, He+, Li2+ and Be3+ are. i can't seem to find out about Be2+ and O7+. How do I calculate it?
November 3, 2010

chemistry
According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 10(3) m/s, the uncertainty in its position is at least a)66 m b)17 m c)6.6 x 10-8 m d)1.7 x 10-8 m e)None of the above
November 3, 2010

chemistry
Which of the following is not a one-electron atom A) H B) He+ C) Li2+ D) Be2+ E) O7+ I know that H, He+, Li2+ and Be3+ are. i can't seem to find out about Be2+ and O7+. How to I calculate it?
November 3, 2010

chemistry
Sorry forgot to post the wavelengths. A) 182nm B) 103nm C) 97nm D) 95nm E) 91nm
November 3, 2010

chemistry
The Rydberg equation, with n1=1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation: 1/ = (1.097 x 10(7) m - 1) x (1/n1(2)-1/n2(2)
November 3, 2010

chemistry
Calculate the frequency of the light emitted by a hydrogen atom during a transition of its electron from the n=3 to n=1 energy level, based on the Bohr theory. use the equation En= -2.18 x10-18 J(1/n2)
November 3, 2010

chemistry
What is the bond angle for H2O2 abd what is the bond angle and how would you draw ClO3-
October 29, 2010

Chemistry
Data: C(graphite) + O2(g) forms CO2 (ga) Delta H = -393.5kJ H2(g) + 1/2O2(g) forms H2O(l)Delta H = 285.8kJ. CH3OH(l) + 3/2O2(g)forms CO2(g) + 2H2O(l)Delta H = -726.4 Using data above, calculate the enthalpy change for the raction below C(graphite) + 2H2 +1/2 O2(g) forms CH3OH(l)
October 27, 2010

chemistry
Data: SO2(g)+ 1/2O2(gas)forms SO3(g)Delta H = -99.1 kJ. Given the above data, calculate the enthalpy change when 89.6 g of SO2 is converted to SO3. Is this a grams to moles conversion or what? I can't find any examples of this type of calculation.
October 27, 2010

chemistry
Data: 2Ba(s) + O2(g) ¡æ 2BaO(s) ∆H¡Æ = -1107.0 KJ Ba(s) + CO2(g) + ¨ö O2(g) ¡æ BaCO3(s) ∆H¡Æ = -822.5 KJ Given the data above, calculate the ∆H¡Æ for the reaction below. BaCO3(s) ¡&...
October 25, 2010

chemistry
A hydrocarbon sample was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.00 kg of water rose from 20.45 celsius to 23.65 celsius.The heat capacity of the caloimeter, excluding the water, is 2.21 kJ/degree celsius. using this information, determine ...
October 25, 2010

chemistry
A sample of hydrogen gas was collected over water at 36 degrees celsius and 855 mmHg. The volume of the container was 6.50 L. Calculate the number of moles of H2 collected. (vapor pressure of water is 44.6 torr at 36 degrees Celsius)
October 20, 2010

chemistry
A 1.325 g sample of an unknown vapor occupies 386 mL at 114 celsius and 946 mmHg. The simplest formula of the compound is NO2. What is the molecular formula of the compound? (I have N2O4, is this correct and if not, why not? We never went over this type of question in class! ...
October 20, 2010

Chemistry
Convert a gas pressure of 485 cmHg to atmospheres. (cm not mm!)Wouldn't you simple convert cm to mm (4850) and divide by 760 mmHg?
October 20, 2010

chemistry
If a cetain pressure supports a 256 mm high column of mercury, how high a column of water will it support? The ensity of mercury is 13.6 g/mL. Not completely sure how to work this one, we never reviewed it in class. All the answers to chose from are in inches or ft. I'm ...
October 20, 2010

chemistry
A 1.325 g sample of an unknown vapor occupies 386 mL at 114 celsius and 946 mmHg. The simplest formula of the compound is NO2. What is the molecular formula of the compound? (I have N2O4, is this correct and if not, why not? We never went over this type of question in class!
October 19, 2010

chemistry
How many grams of CO2 are contained in 550 mL of the gas at STP I've worked all of these questions and I'm trying to see if I'm right, and if not, where I went wrong.
October 19, 2010

chemistry
Calculate the pressure of 0.55 mol NH3 gas in a 2.00 L vessel at 25 celsius, using ideal gas law.
October 19, 2010

chemistry
Calculate the density of chlorine gas in g/L, at STP I'm coming up with 3.2g/L (by using 70.9 g Cl2) Cl gas is diatomic, correct? Is this correct?
October 19, 2010

chemistry
The first step in the Ostwald process for making nitric acid is the formation of NO as follows; 4HN3 + 5O2 makes 4NO + 6 H2O. According to the equation, 5 moles of NH3 will react stoichiometrically with blank moles of O2 to form blank moles of NO. I can't figure out how to...
October 19, 2010

chemistry
A steel tank contains carbon dioxide at 34 celsius and is at 13.0 atm. Determine the internal gas pressure when the tank and its contents are heated to 100 clesius. Do i need to convert to kevins here. There are answers using both, so which is correct.
October 18, 2010

chemistry
Do I need to convert the temperature from Celsius to Kelvin for this equation. The answers are multiple choice and there is one for it using both. Isn't kelvin always used for these type of calculations?
October 18, 2010

chemistry
A steel tank contains carbon dioxide at 34 celsius and is at a pressure of 13.0 atm. Determine the internal gas pressure when the tank and its contents are heated to 100 celsius
October 18, 2010

chemistry
Sorry, its mm of mecury.
October 18, 2010

chemistry
if a certain pressure supports a 256 column of mecury, how high a column of water would it support?
October 18, 2010

chemistry
if 22.5 mL of 0.383 M HCl are required to completely neutralize 20.0 mL of KOH, what is the molarity of the KOH solution?
October 13, 2010

chemistry
If 20.0mL of an unknown acid was titrated with 2.0 M KOH and 60.0 mL KOH was used what is the molarity of the unknown acid?
October 13, 2010

6th grade science
calculate how many grams of chloride ions are present in 50 grams of ocean salts.
January 13, 2009

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