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April 16, 2014

Search: Chemistry: Compound

Number of results: 103,406

Chemistry
A 0.02882 g sample of gas occupies 10.0-mL at 288.5 K and 1.10 atm. Upon further analysis, the compound is found to be 38.734% C and 61.266% F. What is the molecular formula of the compound? What is the geometry shape around each carbon atom? Polar or Nonpolar?
Friday, November 23, 2012 at 9:04pm by Anon

Chemistry
Hi, I posted a question yesterday : A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.157 of the compound produced 0.213g CO2 and 0.0310 g H20. In another experiment, it is found that 0.103g of the compound produces 0.0230 g NH3. What is the ...
Thursday, April 15, 2010 at 12:59pm by Anonymous

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.
Sunday, February 21, 2010 at 7:08pm by Jack

Chemistry
A compound is 54.52% C, 9.15% H, and 36.32% O by mass. What is the empirical formula? The molecular mass of the compound is 132 amu. What is the molecular formula?
Sunday, September 18, 2011 at 9:56am by Jerry

Chemistry
A compound containing only boron, nitrogen, and hydrogen was found to be 40.3% B, 5202% N, 7.5% H by mass. If 3.301g of this compound is dissolved in 50.00g of benzene, the solution produced freezes at 1.30 degree celsius. if the freezing point depression constant/cryoscopic ...
Sunday, November 10, 2013 at 12:28am by Temmick

chemistry
If the heat of combustion for a specific compound is -1310.0 kJ/mol and its molar mass is 75.45 g/mol, how many grams of this compound must you burn to release 708.60 kJ of heat?
Sunday, October 21, 2012 at 10:29pm by :)

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
Saturday, November 10, 2012 at 9:59pm by Drew

chemistry
If the heat of combustion for a specific compound is -1460.0 kJ/mol and its molar mass is 55.75 g/mol, how many grams of this compound must you burn to release 900.20 kJ of heat?
Thursday, April 5, 2012 at 12:36pm by catey

Chemistry
If the heat of combustion for a specific compound is -1320.0 kJ/mol and its molar mass is 92.41 g/mol, how many grams of this compound must you burn to release 544.30 kJ of heat?
Tuesday, October 9, 2012 at 10:55pm by Anonymous

Chemistry
If the heat of combustion for a specific compound is -1010.0 kJ/mol and its molar mass is 46.03 g/mol, how many grams of this compound must you burn to release 388.00 kJ of heat?
Wednesday, March 27, 2013 at 1:56pm by Anonymous

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
Wednesday, February 19, 2014 at 10:46am by Ahmad

Chemistry
I'm supposed to do this for an organic chemistry prelab. I've read my books and tried Googling everything possible, but I still don't know how to set this up. Please help! The solubility of a certain compound in ice-cold water is 0.18g in 100 mL. Its solubility in hot water is...
Thursday, September 29, 2011 at 1:18am by Katy

Chemistry rework problem
Thank you Dr. Bob222 An unknown compound contains carbon, hydrogen, and oxygen. When burned, a 2.000 gram sample of this compound releases 3.451 g of carbon dioxide and 1.059 grams of water. What is the empirical formula of this compound? Here is the problem I worked out: C=....
Monday, October 17, 2011 at 9:21pm by Mom

Chemistry
yes, of course. See Graham's law of effusion. If the effusion rate is different for each compound, then for each compound the mole ratio will change. In this case, O2 will effuse faster, so the mole ratio will be greater than 2:1, as more O3 remains.
Monday, April 26, 2010 at 1:36pm by bobpursley

Chemistry (balance)
if the heat of combustion for a specific compound is -1320.0 KJ/mol and its molar mass is 67.53 g/mol how many grams of this compound must you burn to release 791.60 kj of heat
Monday, August 20, 2012 at 1:06pm by Jacob

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?
Monday, October 22, 2012 at 2:01am 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?
Sunday, October 21, 2012 at 3:30pm 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?
Monday, October 22, 2012 at 2:01am 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.
Thursday, January 31, 2013 at 6:30pm by Zach

Chemistry
The following thermodynamic data was obtained for an unknown compound. Delta Hvap = 31.3 kj/mol and Delta S Vap= 79.7 kj/mol .Calculate the normal boiling point of this compound in Celcius.. Thank you!
Monday, April 29, 2013 at 10:01pm by Chloe

Grammar and Composition
6. Tell me about your vacation. a. this is a declarative sentence b. this is an imperative sentence c. this is an interrogative sentence d. this is an exclamatory sentence B 7. The rain poured into the river and flooded the nearby community. a. this is a simple sentence b. ...
Friday, October 16, 2009 at 2:57pm by y912f

Chemistry
Have you omitted part of the problem? If you are referring to "this" compound as the new compound, I would think pentane. If you are referring to the original compound, you haven't provided enough information. http://www.elmhurst.edu/~chm/vchembook/501hcboilingpts.html I would...
Monday, March 14, 2011 at 10:20pm by DrBob222

Chemistry PLEASE HELP!
A compound is known to contain only C, H, and N. On combustion of a sample of 12.5 mg, 22.3 mg of CO2 and 15.2 mg of H2O were produced. Use this data to find the empirical formula for the compound. (Please show working out)
Tuesday, June 12, 2012 at 7:18am by Kevin

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 ...
Saturday, April 30, 2011 at 9:34am by Jude

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 ...
Wednesday, March 31, 2010 at 11:41pm by Anonymous

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
Monday, April 18, 2011 at 5:32pm by darrell

Organic Chemistry
A compound whose solubility in ethanol is 4.24g/100ml at 78c and .3 g/100ml at 0c is recrystalize by heating it at 78 and then cooling it to 0c. If we are to recrystalize a .5g of this compound in a 10ml of solvent, what is the maximum possible % recovery?
Monday, February 14, 2011 at 1:31am by PEd

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...
Monday, August 29, 2011 at 11:13am by Ty

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?
Friday, September 2, 2011 at 9:05am 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.
Thursday, November 1, 2012 at 7:48pm by Ibraheem

Chemistry
so i would find the percent of iron in the compound, and then find the total mass of the compound and multiply it by the percent of iron that i found?
Tuesday, February 16, 2010 at 7:47pm by Anonymous

Chemistry
A sulfur-containing compound is decomposed and the products are collected over water according to this equation: SxOy -> SO2(g) + O2(g) The mole fractions for the products are as follows: SO2 (.8) and O2 (.2) What is the empirical formula for the original compound?
Monday, October 4, 2010 at 6:20pm by Alyssa

Chemistry
The solubility of compound A in ethanol is 0.4 g per 100 mL at 0C and 5.0 g per 100 mL at 78C. What is the minimum amount of solvent needed to recrystallize an 8.0 g sample of compound A? How much would be lost in the recrystallization? Show your work.
Thursday, September 20, 2012 at 7:37pm by david

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?
Wednesday, December 4, 2013 at 6:23am by joan

chemistry
find the mass of carbon and the mass of the carbon compound mass percent composition of carbon = mass of carbon/ mass of carbon compound x 100% for example: for a) mass of carbon=4(12) mass of carbon compound=4(12)+10(1) 48/58 x 100%
Saturday, September 11, 2010 at 12:57pm by Anonymous

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 ...
Tuesday, December 11, 2012 at 7:57am by Anon

Chemistry
They tell you that compound A2B has twice the mass of B as A. That requires that element A have 1/4 the mass of B. For a compound to have three times more B than A (my mass), the formula must be A4B3, or (A4B3)n, where n is an integer
Friday, July 2, 2010 at 9:57pm by drwls

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.
Saturday, February 16, 2013 at 1:12pm by Dylan

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!
Sunday, October 28, 2012 at 3:02pm by Hannah

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?
Thursday, September 29, 2011 at 1:15pm by tom

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?
Wednesday, March 28, 2012 at 10:40pm by Dylan

Math 8th grade
A compound is made up of various elements totaling 90 ounces. If the total amount of zinc in the compound is 1 ounce, what percent of the compound is made up of zinc? Is it 1%
Monday, December 8, 2008 at 9:51pm by Alyssa

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 ...
Monday, March 12, 2012 at 6:04pm 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 ...
Monday, March 12, 2012 at 6:41pm by India

chemistry
A 2.91 gram sample of a gaseous compound that contains only boron and hydrogen has a volume of 1.22 L at 25°C and 1.09 atm. What is the formula of this compound? (Atomic Weight: H = 1.01, B = 10.8 amu) I am not sure but it is B6H10? But I am nto sure if that way i did it ...
Friday, November 7, 2008 at 3:47am by songyi

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 ...
Thursday, October 25, 2012 at 2:48pm 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 ...
Monday, March 3, 2014 at 4:29pm by smith

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?
Saturday, July 2, 2011 at 9:56am by watson

Chemistry(Please help)
The common laboratory solvent diethyl ether (ether) is often used to purify substances dissolved in it. The vapor pressure of diethyl ether , CH3CH2OCH2CH3, is 463.57 mm Hg at 25oC. In a laboratory experiment, students synthesized a new compound and found that when 27.18 grams...
Sunday, February 19, 2012 at 10:52pm by Hannah

chemistry
molar mass Ca(C2H3O2)2 = ?? mass H in compound is 6 %H = (6/molar mass compound)*100 = ??
Sunday, November 7, 2010 at 11:23pm by DrBob222

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...
Tuesday, May 1, 2012 at 10:34pm by joe

Chemistry
I would take a 100g sample which will give you 5.0g of the iron compound, 7.0g of the Mg compound, and 88g SiO2. 5.0g x %Fe in the iron compound = g Fe. 7.0g x %Mg in the Mg compound = g Mg. %Fe = (gFe/100g)*100 %Mg = )gMg/100g)*100 For Si, compute g Si in the iron cmpd and ...
Wednesday, August 31, 2011 at 7:20pm by DrBob222

English
1)compound 2)complex 3)complex 4)compound complex 5)simple 6)simple 7)simple 8)simple 9)compound 10)compound 11)complex 12)complex 13)simple
Tuesday, November 9, 2010 at 2:10pm by Tom Jameson

Science
Is that not obvious? Compound A dissolves slightly in cold water but all will dissolve in hot water. Compound B dissolves easily in cold and hot water. So a mixture of A and B gets dissolved in a minimum of hot water, then the solution is allowed to cool, and compound A ...
Friday, November 7, 2008 at 10:07pm by DrBob222

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
Thursday, June 3, 2010 at 4:48am by Darali

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 ...
Thursday, September 30, 2010 at 8:56pm 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 ...
Sunday, September 18, 2011 at 10:19pm by Louis

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
Sunday, October 17, 2010 at 10:37pm 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?
Tuesday, October 18, 2011 at 8:53am by Anonymous

chemistry
2. When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46C. (a) Calculate the molar mass of the unknown compound. The freezing point of benzene is 5.48C, and the Kf of benzene is 5.12 C/Molal. Show your...
Wednesday, November 14, 2012 at 9:15pm by Helen

chemistry
2. When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46C. (a) Calculate the molar mass of the unknown compound. The freezing point of benzene is 5.48C, and the Kf of benzene is 5.12 C/Molal. Show your...
Wednesday, November 14, 2012 at 9:09pm by Helen

chemistry
2. When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46C. (a) Calculate the molar mass of the unknown compound. The freezing point of benzene is 5.48C, and the Kf of benzene is 5.12 C/Molal. Show your...
Wednesday, November 14, 2012 at 9:09pm by Helen

chemistry
2. When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46C. (a) Calculate the molar mass of the unknown compound. The freezing point of benzene is 5.48C, and the Kf of benzene is 5.12 C/Molal. Show your...
Wednesday, November 14, 2012 at 9:09pm by Helen

chemistry
2. When 0.354 g of an unknown nonelectrolyte compound was dissolved in 12.5 g of benzene a solution was formed that froze at 4.46C. (a) Calculate the molar mass of the unknown compound. The freezing point of benzene is 5.48C, and the Kf of benzene is 5.12 C/Molal. Show your...
Thursday, November 15, 2012 at 7:42am by Helen

chemistry
O is -2. Cl is -3 and there are thee of them for -3. Total is -5; therefore, P must be +5 for the compound to be zero. (All compounds are zero). H is +1. O is 3x -2 for -6. Cl must be +5 for the compound to be zero.
Wednesday, November 30, 2011 at 8:41pm by DrBob222

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?
Tuesday, July 27, 2010 at 2:30pm by David

Chemistry
To be orange the compound must absorb in the blue. To be blue the compound must absorb in the orange. Therefore, the first compound colored orange must be absorbing higher energy (blue is higher than orange). To become a blue compound it must have a lower energy; therefore, ...
Wednesday, November 9, 2011 at 10:27pm by DrBob222

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...
Monday, October 30, 2006 at 11:35pm by liz

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!!!!
Tuesday, October 27, 2009 at 2:01am by Urgent, thank you

English
None of these are run-ons. A = simple subject, compound verb B = compound sentence joined with semicolon C = compound subject, simple verb
Monday, March 24, 2008 at 3:03pm by Writeacher

chemistry
A compound of nitrogen and oxygen is 36.8% nitrogen. A second compound of nitrogen and oxygen is 25.9% nitrogen. What is the ratio of masses of oxygen in the two compounds per gram of nitrogen?
Friday, September 30, 2011 at 1:17am by Ciarra

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.
Thursday, April 19, 2007 at 10:15pm by John

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 ...
Monday, March 23, 2009 at 10:53am by Olivia

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
Thursday, May 26, 2011 at 8:37pm 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
Thursday, May 26, 2011 at 8:37pm by Roxanne

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.
Friday, June 17, 2011 at 11:30pm by Lance

chemistry
Use PV = nRT and solve for n = number of moles. Then n = grams/molar mass and solve for molar mass. I assume this is a relatively common compound and you are to recognize the name of the compound from the molar mass.
Thursday, April 7, 2011 at 2:35am by DrBob222

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 ...
Friday, January 10, 2014 at 12:31pm by Anonymous

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)?
Friday, March 22, 2013 at 6:08pm by Raul

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
Thursday, April 29, 2010 at 1:08pm by Maria

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?
Thursday, November 29, 2012 at 7:35pm by HELP

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 ...
Sunday, December 12, 2010 at 5:17pm by fatima

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 ...
Monday, May 3, 2010 at 10:22am by Julia

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 ...
Wednesday, February 27, 2013 at 3:48pm by johnson

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 ...
Monday, February 15, 2010 at 3:01pm by Jacob

science
Compound A has a MW of 283. 0.423g of Compound A is dissolved in 13.5mL of water and 1mL of the solution added to 5mL of water to produce solution A. What is the concentration of Compound A in solution A?
Friday, December 9, 2011 at 4:16pm by jake

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 ...
Friday, November 28, 2008 at 8:37am by HELP NOW

Organic chemistry plz help me out (thanks)
1) a) What is the normail boiling point (760 mm Hg) for a compound that boils at 150 degree celsius at 10 mm Hg pressure? b) At which temperature would the compund in (a) boil if the pressure were 40 mm Hg? c) A compound was distilled at atmospheric pressure and had a boiling ...
Thursday, September 26, 2013 at 5:47pm by Laila

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...
Wednesday, August 10, 2011 at 1:15am by Anonymous

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 ...
Saturday, April 10, 2010 at 12:43pm by biggie

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)
Monday, December 6, 2010 at 12:34pm by Cami

Physical Science
Here are some links to investigate. But never forget a good dictionary where you could look u the definition of each term. compound = . A combination of two or more elements or parts. See Synonyms at mixture. molecule = (Chemistry): the simplest unit of a chemical compound ...
Wednesday, May 5, 2010 at 12:50pm by SraJMcGin

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 ...
Sunday, May 1, 2011 at 12:03am by Jude

Chemistry
NaCl is ionic and that's a binary compound. NO2 is a covalent compount and that is a binary compound. Many binary compounds are covalent. SO2, NO, NO2, N2O4, N2O3, N2O5, P2O5, P2O3, Cl2O, just to name a few. And these share electrons to form the covalent bond.
Tuesday, March 15, 2011 at 3:32pm by DrBob222

English
cs means compound, cx means complex, f smeans fragment, s means simple, csc means simple compound subject and scv means simple compound verb. im only 12.
Monday, December 5, 2011 at 8:06pm by crystal

chemistry
This question is about the polymer made by polymerizing this compound: CH2=CH-CH-OH | CH Please identify the monomer unit - there should be 3... also, what type of polymerization is involved in forming this polymer? sorry - the compound is.... CH2=CH-CH-OH ________| _______CH3
Monday, February 5, 2007 at 10:49am by david

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?
Saturday, April 4, 2009 at 9:16am by jess

chemistry
When 4.167 g of a unknown compound is added to 34.1 g of a particular solvent, the freezing point of that solvent decreases by 0.8 C. Determine the molar mass of the unknown compound. (The freezing point constant of the solvent is 2.82 C/m).
Monday, January 28, 2013 at 5:51pm by ama

Organic Chemistry
Another argument I just overlooked is that one of the reactants, cinnamaldehyde, contains a trans structure around the c=c double bond that is preserved in the final compound, 1,4-Diphenyl-1,3-butadiene. Thus, we cannot have two cis structures in the C=C-C=C chain which is the...
Thursday, July 24, 2008 at 8:54pm by GK

grammar
1.Christina and Christopher worked together and completed a project about astronomy. simple subject and compound predicate? 2.Jennifer and her brother were not allowed to go to Great Adventure with the Jones family. Compound subject and compound predicate 3. Take this to ...
Friday, July 1, 2011 at 9:21pm by lizzie

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