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November 27, 2014

Search: Chemistry: Compound

Number of results: 48,334

math
calculate the effective yield, then rank them from highest yield to lowest yield: 12% compound annually 11.8% compound quarterly 11.9% compound semiannually
April 18, 2011 by darrell

Chemistry
The empirical formula of a compound is CH2O and the molecular mass is 180. What is the molecular formula of the compound?
December 14, 2010 by Haley

Organic Chemistry
Compound A is recrystallized from n-propanol. Given are the following solubilities (in 100 mL of solvent): 160 g/100 C, 100 g/80 C, 60 g/60 C, 20 g/20 C, 15 g/10 C and 10 g/0 C. How many milliliters of solvent are needed to dissolve 80.0 g of compound A during the ...
April 29, 2010 by Maria

Chemistry
Student in O-Chem Lab conducts a melting point experiment with an unknown compound and observes a melting range of 210 218C. Is this a typical range for a melting point? If not, what range would be typical? For this question, does it mean an unknown compound in general? I am...
August 30, 2009 by Christine

Chemistry
A compound is characterized by the following constants: Heat of fusion = 75 cal/g Heat of vaporization = 20 cal/g The heat of deposition for the same compound is
January 23, 2012 by Anonymous

Chemistry
Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was 8.174e-9J/K I used S= klnW and got lnW = 5.92e14. How do i get the number of ...
April 30, 2011 by Jude

Chemistry
Using data in table below and S (NaCl(s))= 72.38 Jmol-1K-1, calculate fS for NaCl(s) in Jmol-1K-1. Compound S , Jmol-1K-1 Compound S , Jmol-1K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8 S(s) 31.8
May 26, 2011 by Roxanne

Chemistry
Using data in table below and S (NaCl(s))= 72.38 Jmol-1K-1, calculate fS for NaCl(s) in Jmol-1K-1. Compound S , Jmol-1K-1 Compound S , Jmol-1K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8 S(s) 31.8
May 26, 2011 by Roxanne

chemistry
a compound contains only carbon hydrogen and oxygen analysis of a sample showed that it contained by mass 53.4% carbon and 11.1% hydrogen . what is the simplest formula for this compound .. step by step plese
February 19, 2014 by Ahmad

Chemistry
Using data in table below and S (NH3(g))= 192.5 Jmol-1K-1, calculate fS for NH3(g) in Jmol-1K-1. Compound S , Jmol-1K-1 Compound S , Jmol-1K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8 S(s) 31.8
June 3, 2010 by Darali

chem
A 0.01020 mg sample of an unknown compound was found to contain 0.0084 mg of C, and 0.0018 mg of H. It was also determined that the unknown compound had a molecular weight of 58.12 g/mol. What is the molecular formula for this compound?
November 29, 2012 by HELP

Chemistry
Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. Answer: ? b)How many atoms of iron are in ...
March 31, 2010 by Anonymous

Chemistry
Compound Z has a MW of 100. Your lab partner weighed 25 grams of compound Z and dissolved it in water to a final volume of 1 liter. a) What is the concentration of the solution expressed as a percentage by weight (w/v)? b) What is the concentration of the solution expressed as...
August 29, 2011 by Ty

AP Chemistry
The heat of reaction for burning 1 mole of a certain compound X is known to be -477.7 kJ. The calorimeter constant of the bomb being used is 2500 j/degree celsius and the initial temperature of the water is 23.2 degrees celsius. a) if 22.54 g of compound X (MM=46.0) is burned ...
February 15, 2010 by Jacob

chemistry
A 0.009298-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 27.1oC. If the heat capacity of the calorimeter is 4.84 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
November 3, 2014 by Sasha

College chemistry
When your body metabolizes amino acids, one of the final end products is urea, a water so liable compound that is removed from the body as urine. Why is urea soluble in water, when hexamide, a related compound is not?
October 22, 2012 by Leslie

College chemistry
When your body metabolizes amino acids, one of the final end products is urea, a water so liable compound that is removed from the body as urine. Why is urea soluble in water, when hexamide, a related compound is not?
October 22, 2012 by Leslie

Organic Chemistry
Why is the melting point of a known compound (ex. acetanilide) determined before the melting point of the unknown compound? I think it is to determine if the unknown is a pure substance but I am not sure..I just need to be pointed in the right direction.
January 31, 2013 by Zach

chem
A 0.01205 mg sample of an unknown compound was found to contain 0.0001 mg of H, 0.0043 mg of Cl, and 0.0077 mg of O. It was also determined that the unknown compound had a molecular weight of 100.46 g/mol. What is the molecular formula for this compound?
October 15, 2007 by Mike

Chemistry
you add excess sodium sulfate to a solution of a soluble barium compound in order to precipitate all of the barium ion as barium sulfate, BaSO4. Suppose a 458 mg sample of the barium compound is dissolved to create the solution. Then when the sodium is added, 513 mg of barium ...
March 12, 2012 by India

Chemistry
you add excess sodium sulfate to a solution of a soluble barium compound in order to precipitate all of the barium ion as barium sulfate, BaSO4. Suppose a 458 mg sample of the barium compound is dissolved to create the solution. Then when the sodium is added, 513 mg of barium ...
March 12, 2012 by India

Chemistry
I am rewriting this question and using dots to make sure that everything lines up correctly so please ignore the dots. 1. name this hydrocarbon .......CH3...CH3 .......|.....| CH3-CH-C-CH2-C-CH2-CH3 ....|..|.....| ....CH3CH2..CH2 .......| ........CH3 I have come up with normal...
June 4, 2010 by Mary

Chemistry
In a first order decomposition reaction, 50% of a compound decomposes in 10.5 min. What is the rate constant of the reaction? How long does it take for 75% of the compound to decompose? My professor did this problem in class: k = .693 / 10.5 mins = .066 min ^-1 where did .693 ...
April 10, 2010 by biggie

Chemistry
A compound F on heating give a cracking sound and G give a reddish brown fumes when hot, and yellow when cool, and a gas H light a glowing splint and a residue J. Identify F,G,H,J. What is the name of that crack sound and the name of the compound?
September 2, 2011 by Rilwan

Math,Physics,Chemistry
Calculate the gravitational force of attraction between two protons in a chemical compound.Take the mass of proton as 0.0000000000000000000000000000167 kilogramme and the distance between the protons in a chemical compound is 0.000000000010 metre.
November 1, 2012 by Ibraheem

chemistry
In order to determine the number of atoms in a compound, you must know the number of atoms in a representative particle of the compound. True False i think false
November 10, 2012 by Drew

Chemistry
What is the solubility in hexane for in an ionic compound and what is a solubility in hexane for a covalent (molecular) compound
May 5, 2014 by Kiki Mich

Chemistry
Hello, I am looking just for someone to tell me how I go about doing this problem, ie. the formula that i would need to know for it. I would really like to figure it out on my own but I'm not sure how to. The mass ratio of Kr to F in a particular compound is 2.206:1. How many ...
September 30, 2010 by kathryn

Chemistry
A 185.325 g sample of a compound of carbon, nitrgoen and hydrogen is burned completely. Calculate the empirical formula if 225.0 g of water and 230.0 g of NO2 is formed. In another experiment the sample was found to have a density of 10.9 g/L at 1.20 atm and 25.0 degrees ...
September 18, 2011 by Louis

Chemistry
Determine the mass of a nonvolatile, nonionizing compound that must be added to 4.68 kg of water to lower the freezing point to 98.70oC. The molar mass of the compound is 50.0 g/mol and the Kf for water is 1.86oC kg/mol. Ignore significant figures for this problem. Answer
February 22, 2012 by renee

chemistry calculations
when 2.750 g of the oxide of lead is heated to a high temperature,it decomposes to produce 0.0640 g of oxygen gas and 2.686 g of some new lead oxide compound.How can you use this data to determine the formula of the new compound?
December 4, 2013 by joan

integrated physics and chem
Element A and element B have bonded and formed compound AB. Which of the following statements is true? A. Compound AB has chemical and physical properties that are completely different from those of A and B. B. Compound AB has chemical and physical properties that are a blend ...
January 10, 2014 by Anonymous

CHEMISTRY
Assume an organic compound has a partition coefficient between water and diethyl ether equal to 7.33. If there are initially 9.81 grams of the compound dissolved in 100.0 mL of water, how many grams will remain in the aqueous layer after extraction with one 30.0 mL portion of ...
September 9, 2012 by KRISTINA

CHEMISTRY
Assume an organic compound has a partition coefficient between water and diethyl ether equal to 7.33. If there are initially 9.81 grams of the compound dissolved in 100.0 mL of water, how many grams will remain in the aqueous layer after extraction with one 30.0 mL portion of ...
September 9, 2012 by KRISTINA

Thermochemistry
A constant pressure calorimeter having a heat capacity of 60.8 kJ/K is used to measure the energy released from burning a compound in excess oxygen to form CO2(g) and H2O(l). If the enthalpy of combustion of the compound is -2914.0 kJ/mol and the temperature of the calorimeter...
December 4, 2011 by LaurenB

chemistry
if one can find the ratio of the number of moles of the elements in a compound to one another, one can find the formula of the compound. in certain compound of copper and oxygen, Cux Oy, we find that a sample weighing 0.5424g contains 0.4831g Cu. a. How many moles of Cu are in...
June 23, 2010 by Ana

chemistry
An experiment to determine compound partition among air, water, and soil phases was conducted by adding 1 gram of the compound to a reactor that had 1 m3 of air, 0,001 m3 of water0 and 100 g of solid. The reactor was at atmodpheric pressure and at aconstant tepmrature 20 C The...
October 7, 2014 by Osama

chemistry
An experiment to determine compound partition among air, water, and soil phases was conducted by adding 1 gram of the compound to a reactor that had 1 m3 of air, 0,001 m3 of water0 and 100 g of solid. The reactor was at atmodpheric pressure and at aconstant tepmrature 20 C The...
October 12, 2014 by Osama

Chemistry
The solubility of a certain compound in ice-cold water is 0.22g in 100mL. Its solubility in hot water is 4.35g in 100mL What is the best possible percent recovery we can expect for the re-crystallization of this compound in water?
September 29, 2011 by tom

Chemistry (Aqueous Solutions)
This one stumped me alot... Aqueous solutions of a compound did not form precipitates with Cl-, Br-, I-, SO4 2-, CO3 2-, PO4 3-, OH-, or S 2-. This highly water-soluble compound produced the foul-smelling gas H2S when the solution was acidified. This compund is __?__. a. Pb(...
April 5, 2010 by Macey

Chemistry
Xenon of mass 5.08 g reacts with fluorine to form 9.49 g of a xenon fluoride. What is the empirical formula of this compound? A) XeF6 B) XeF4 C) XeF2 D) XeF E) Xe2F I am not familiar with these types of empirical formula problems. If I'm given the percentages of the elements ...
March 23, 2009 by Olivia

Chemistry
A 0.5370 g sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as AgCl by the addition of an excess of silver nitrate. The mass of the resulting AgCl is found to be 1.2523 g. What is the mass percentage of chlorine in ...
October 25, 2012 by Orla

chemistry
A 0.5917 g sample of a pure soluble chloride compound is dissolved in water, and all of the chloride ion is precipitated as AgCl by the addition of an excess of silver nitrate. The mass of the resulting AgCl is found to be 1.5683 g. What is the mass percentage of chlorine in ...
March 3, 2014 by smith

chemistry
Compound A contains 1.75g nitrogen and 3.99g oxygen. Compound B contains 19.6g nitrogen and 56.0g oxygen. Are compounds A and B the same? Explain.
February 21, 2010 by Jack

Chemistry 1201
An unknown compound contains only carbon, hydrogen, and oxygen (C?H?O?). Combustion of 6.50 of this compound produced 9.53 g of carbon dioxide and 3.90 g of water. 1) How many moles of Carbon? 2) How many moles of Hydrogen?
March 28, 2012 by Dylan

Chemistry
I'm so confused as to how to even begin the problem and where to put whats given to me into an equation. 1) If the value of Kp is 0.5 for the distribution of a compound between pentane (solvent 2) and water (solvent 1), and equal volumes of the two solvents were used, how many...
August 10, 2011 by Anonymous

chemistry
Im doing my lab report about steam distillation? and its asking me how i can tell if the two compounds i steam distilled are pure. but im not sure how to tell? i mean is the volatile or the nonvolatile compound the pure compound? or maybe the boiling point is what tells me if ...
February 17, 2011 by ben

A.P Chemistry
Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X 64.8% ? Y 73.0% 104. Z 59.3% 64.0 (a) the vapor...
October 23, 2006 by Brianna

Chemistry
A certain compound containing only carbon and hydrogen was found to have a vapor density of 2.550 g/L at 100 degrees C and 760 mm Hg. If the empirical formula of this compound is CH, what is the molecular formula of this compound? I had some ideas as to how to solve this ...
December 9, 2012 by Amy

IPC
Element A and element B have bonded and formed compound AB. Which of the following statements is true? A) Compound AB has chemical and physical properties that are completely different from those of A and B. B) Compound AB has chemical and physical properties that are a blend ...
November 4, 2010 by Kaitlin

Chemistry(Please help)
I know that to calculate the specific rotation for a compound you do observed rotation / path length(dm) * conc. (g/ml). I am confused about how to calculate the specific optical rotation for a compound. Thank you for your help!
October 28, 2012 by Hannah

Chemistry
A compound of Tin Sulfate is decomposed in the lab to give 1.91g of Tin, 1.03 grams of Sulfur, and 2.06g Oxygen. Determine if this is a compound of Tin(II) Sulfate or Tin(IV) Sulfate.
February 16, 2013 by Dylan

chemistry
A 0.016076-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 24.5oC. If the heat capacity of the calorimeter is 4.98 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
March 1, 2014 by abby

chemistry
A 0.016076-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 24.5oC. If the heat capacity of the calorimeter is 4.98 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
March 5, 2014 by abby

Chemistry
I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its molecular weight is 102.2...
February 20, 2012 by Matthew

Chemistry
I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its molecular weight is 102.2...
February 20, 2012 by Matthew

chemistry
If a student attempts to identify an unknown compound by methodused in this experiment. She finds that when she heated a sampleweighing 0.4862 g the mass went down appreciably, to 0.3067 g. Whenthe product was converted to chloride, the mass went up, to 0.3382g. a. Is the ...
February 27, 2013 by johnson

english
Write whether a sentence is simple, compound, complex, or compound-complex. 5-The day of the party arrived, and everyone showed up at the Huang's house in costume. Compound 6-Kim wanted a new watch for a graduation gift. Simple 7-Because she was swimmer,she wanted one that was...
May 1, 2012 by joe

Chemistry(Please answer)
How many chirality centers does the compound 1,3-dibromo-2,4-dichloro-5-fluorocyclopentane have? This compound has three different elements, a Br which is repeated twice, a cl which is also repeatd twice, and a fluorine. I was thinking that the number of centers would be 3 ...
October 18, 2012 by Hannah

College Chemistry
I think this should be easy but im stuck. Please help: Suppose a compound could point in any of two directions in the solid and still have the same energy. How many molecules would there be if the total entropy of a solid sample of this compound was 8.174e-9J/K I used S= klnW ...
May 1, 2011 by Jude

Chemistry
A compound on heating gives a crackling sound, a reddish fume, and a gas which relights a glowing splint. the residue is reddish brown when hot and yellow when cold. What are- 1. the compound? 2. the fume 3. the gas 4. the residue?
July 27, 2010 by David

chemistry
The solubility of compound A in ethanol is 0.8 g per 100 mL at 0C and 5.0 g per 100 mL at 78C. What is the minimum amount of ethanol needed to re-crystallize a 12.0 g sample of compound A? How much would be lost in the re-crystallization, that is, would remain in the cold ...
February 8, 2010 by niki

Chemistry
100g of a clear liquid is evaporated and a few grams of white crystals remain. The original liquid wasa a) heterogeneous compound b) heterogeneous mixture c) homogeneous compound d) homogeneous mixture
October 17, 2010 by Jazmin

chemistry
An unknown organic compound that contains carbon,hydrogen and oxygen undergoes a combustion analysis. What happen to the carbon atoms and hydrogen atoms in the compound,assuming that the combustion goes to completion?
October 18, 2011 by Anonymous

Chemistry
ELement A has a valence electronic structure of ns2np1. Element B has the valence electronic structure of ns2np5. Why would you expect a compound from elements A and B to conduct an electric current in its solid state??? Because it is more than likely an ionic compound.
April 19, 2007 by John

Chemistry
For each of the following pairs of elements, state whether the binary compound formed is likely to be ionic or covalent. Give the formula and name of the compound. (a) C, Cl Its covalent, but I get the formula wrong and name wrong,CCl Carbon Chloride.
June 17, 2011 by Lance

Chemistry
At constant volume the heat of combustion of a particular compound is -3378.0 kj/mol.When 1.563 g of this compound ( molar mass of 126.88 g/mol )was burned temp rose 6.991 C. What's the heat capacity of the calorimeter(calorimeter is constant)?
March 22, 2013 by Raul

chemistry
elemental analysis indicates the simplest formula of an unknown is C2H4O. when 0.775g of the compound is dissolved in 50g of benzene(C6H6), the solution freezes at 5.06 degree C. what are the molecular weight and the molecular formula of the compound? the freezing point of ...
April 6, 2007 by kiki

English-Grammar
Although he was born in Scotland, he became a hero of the American Revolution. simple sentence compound sentence complex sentence (my answer) compound complex sentence His ship was badly managed, but Jones refused to give up. simple sentence (my answer) compound sentence ...
December 11, 2012 by Anon

Chemistry
Help please! I need to identify an organic compound and tell the functional group of the molecule- the compound is single-bonded ,it is composed of a middle chain H,C,C,H. Off both carbons are single chains consisting of a H above and below each of the carbon. What ...
May 3, 2010 by Julia

Organic Chemistry
Which purpose does recrystallization serve? (Select all correct answers.) It is used to purify liquids. To separate unreacted solid starting materials from the solid target compound. To remove a solid from a liquid. It is used to purify solids. Improve the yield of the compound
April 29, 2010 by Maria

Chemistry
At 21.0 C, a solution of 23.71 g of a nonvolatile, nonpolar compound in 30.64 g of ethylbromide, C2H5Br, had a vapor pressure of 319.7 torr. The vapor pressure of pure ethyl bromide at this temperature is 400.0 torr. Assuming an ideal solution, what is the molecular mass of ...
July 14, 2014 by Luke

college chemistry
a 20.3 sample of an organic compound was ground with 442 mg of camphor to form an intimate mixture melting at 170.3 degree C. What is the apparent formula weight of the organic compound ? (Kf of camphor=37.7 degree C/m M.P. of camphor= 178.4 degree C)
December 6, 2010 by Cami

Chemistry
When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46 degrees C. Calculate the molar mass of the unknown compound. The freezing point of benzene if 5.48 degrees C, and the Kf of benzene is 5.12 degrees C/...
October 15, 2013 by Shines

Chemistry
Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. answer: 129.68grams 357.477722g/mol is ...
April 1, 2010 by Anonymous

chemistry
When 21.29 g of element A react completely with 58.37 g of E, compound A2E is formed. When 5.41 g of A react with 32.36 g of G, compound AG is formed. If elements E and G react to form EG3, what mass in grams of G is required to react with 11.94 g of E? The molar mass of E is ...
November 6, 2007 by confused student..

chemistry
A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be 1.86oC. Using the Kf value in your textbook , the molar mass of this compound can be calculated to be ...
February 5, 2012 by Anna King

Chemistry
Analysis of a compound indicates that it is 49.02% carbon, 2.743% hydrogen, and 48.23% chlorine by mass. A solution is prepared by dissolving 3.150 grams of the compound in 25.00 grams of benzene, C6H6. Benzene has a normal freezing point of 5.50degreeC and the solution ...
January 10, 2011 by Tracy

Chemistry
Analysis of a compound indicates that it is 49.02% carbon, 2.743% hydrogen, and 48.23% chlorine by mass. A solution is prepared by dissolving 3.150 grams of the compound in 25.00 grams of benzene, C6H6. Benzene has a normal freezing point of 5.50degreeC and the solution ...
January 10, 2011 by Tracy

Chemistry
Analysis of a compound indicates that it is 49.02% carbon, 2.743% hydrogen, and 48.23% chlorine by mass. A solution is prepared by dissolving 3.150 grams of the compound in 25.00 grams of benzene, C6H6. Benzene has a normal freezing point of 5.50degreeC and the solution ...
January 10, 2011 by Tracy

Chemistry ppm
Hey guys, i have a question about how to figure out how much mass of a compound i need to find 130ppm here is the question. What mass of Fe(NH4)2(SO4)2*6H2O is required to prepare 2.25 L of a 130 ppm iron solution? Now i know that ppm is (mg of desired compoun)/(kg of solvent ...
November 16, 2013 by John

physical scince
answer the following question: QUESTION 4: What does it mean if a compound has a solubility of 15g in 100g of water at 0 degrees Celcius? A) 100 g of the compound will dissolve in 15 g of water at 0 degrees celcius B)15 g of the compound will dissolve in 100g of water at 0 ...
December 12, 2010 by fatima

chemistry -drbob222
I'm not sure if my 1 and 2 are correct, and I don't know how to do 3, 4, and 5. Any help is appreciated! 1) You wish to extract an organic compound from an aqueous phase into an organic layer. to minimizing the number of transfer steps, would it be better to use an organic ...
October 9, 2009 by Anonymous

chemistry
Trimellitic acid containing carbon, hydrogen, and oxygen has 51.44% C, 2.88% H, and 45.68% O. It can be obtained by oxidation of coal with nitric acid. A 2.416-g sample of this compound was dissolved in 40.00 g of acetone, producing a solution that boils at 56.64C. Kb for ...
April 14, 2010 by David

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 by lavonne

General Chemistry
Answer Check Please... A compund contains only hydrogen and nitrogen and is 12.6% hydrogen by mass. A gaseous sample of the compound has desity of 0.925g/L at 690 torr and 110 degrees Celsius. What is the molecular formula of the compound? My Empirical Formula = H2N Molecular ...
September 5, 2011 by Kathy

english
Correct each run-on sentence. Combine each pair of sentences into one sentence. You can make compound subjects, compound predicates, or compound sentences. Lee prepared a slide for Ann she observed tiny plants. Can you help me please to get example, please!!!!
October 27, 2009 by Urgent, thank you

grammar
Indentify each sentence as simple, compound, complex, or compound-complex. Could you tell me if my answers are correct please? 1. In 1942, the United States Navy sank four Japanese aircraft carriers; moreover, the United States Army Air Force joined Britain in a bombing ...
November 28, 2008 by HELP NOW

english
are both of these a compound or simple sentences I need to have these as a model for the other one's. 1. Her mother went to trade show, but doreen stayed home. 2. Wang and his brother looked at the problem and spotted the solution. i think: 1. compound because "Her Mother went...
October 30, 2006 by liz

Chemistry
A sample consisting of 22.7 g of a nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00 cm, and a piston is carefully placed on the surface of the compound so that, for all practicla purposes, the distance between the bottom of the cylinder ...
December 16, 2008 by Anonymous

chemistry
a 250.0 ml sample of an aqueous solution at 25 degrees celsius contains 35.8 mg of an unknown nonelectrolyte compound. If the solution has an osmotic pressure of 11.25 mmHg, what is the molar mass of the unknown compound? I know you need to have the answer in g/mol. I have ...
September 30, 2012 by Vic

chemistry
a new compound composed of just Hex-Nuts and bolts is formed.A 13.7 Kg sample of the new compound is separated into its component elements with the following result 3.84 kg. of hex-nuts and 9.90 kg of bolts. 1. How many hex-nuts are present in the 13.7 kg sample 2. how many ...
October 10, 2012 by Amanda

chemistry
Many ionic compounds have high melting points because a lot of energy is required to break the strong ionic bonds. So after breaking the ionic bonds, the ionic compound becomes a liquid. How do you explain why the ionic compound also has high boiling point?
April 4, 2009 by jess

science(chemistry)
I have a question about solvent evaporation. If I had an organic layer and an aqueous layer in an unknown mixture of liquids and wanted to obtain the solid of a compound(s) dissolved in the layers, is it reasonable to assume that I can run the compound in the IR spectrometer (...
April 17, 2009 by ~christina~

ap chemistry
Does H4N2O2 exist as a compound? yes If you wrote it as NH4NO2 would it make more sense to you. And to answer the next question, then compound C is NH4NO3. (H4N2O3). Discuss briefly the relationshiop between the dipole moment of a molecule and the polar character of the bonds ...
December 3, 2006 by sara

chemistry
Are the characteristics or properties of the elements making up a compound different from the characteristics or properties of the compound? For example, are the properties of oxygen and hydrogen different from the properties of water? Explain.
October 13, 2014 by anonymous

Chemistry
Compound A reacts with element B (a halogen) to form compounds C and D as the only products. When 2.000 grams of B react with an excess of sodium metal 2.363 grams of the sodium halide are formed. Compound A is a volatile liquid at room temperature with a density of 0.8800g/ml...
April 17, 2011 by Patrick

chemistry
How do I calculate the number of atoms in a compound (not an element)? I have the mass of the amount of substance, and the molar masses. How do I do this? Is this the same as calculating the number of molecules/ formula units? Also, I know the number of atoms for each element ...
November 19, 2012 by pinkmercy

Chemistry
During recrystallization, an orange solution of a compound in hot alcohol was treated with activated carbon and then filtered through fluted paper. On cooling, the filtrate gave gray crystals, although the compound was reported to be colorless. Explain why the crystals were ...
September 28, 2014 by Vivian

chemistry
Q1.A compound of copper and sulphur is 65.43percent copper by mass.how many grams of copper can be obtained from 249g of this compound?and how many grams of sulphur remain?
July 2, 2011 by watson

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