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April 23, 2014

Search: chemisry

Number of results: 85

chemisry
How can we help you with the assignment?
Monday, October 1, 2012 at 9:05pm by DrBob222

chemisry
poop
Tuesday, May 4, 2010 at 10:57am by Anonymous

incomplete---chemisry
no part a.
Thursday, May 30, 2013 at 11:36pm by DrBob222

chemisry
dune infiltration
Tuesday, September 24, 2013 at 11:55am by julio

chemisry
moles = g/molar mass.
Sunday, June 19, 2011 at 11:34pm by DrBob222

CHEMISRY
It will be lower the higher you go.
Thursday, October 18, 2012 at 8:14am by DrBob222

Chemisry
if there are equal volumes of each fluid, yes.
Monday, August 26, 2013 at 6:37pm by Steve

chemisry
The answer is no more precise than the measurements.
Sunday, April 27, 2008 at 7:15pm by DrBob222

Chemisry
8/32=1/4=0.25 moles of oxygen
Saturday, February 26, 2011 at 8:37am by sanjeet

chemisry
hydrides. NaH, KH, LiH, etc.
Wednesday, October 2, 2013 at 12:46pm by DrBob222

chemisry
density and viscosity of a salicyclic acid solution
Sunday, February 14, 2010 at 1:30am by arp

chemisry
Ag + S 2- Al0 Ag0 Al 3+ S2-
Wednesday, August 25, 2010 at 10:13am by Anonymous

chemisry
When alkali metals are heated with hydrogen they form what
Wednesday, October 2, 2013 at 12:46pm by john

Chemisry
These are thought questions. We shall be happy to critique your thoughts.
Sunday, January 27, 2008 at 7:17pm by DrBob222

Chemisry
I don't understand what you do after you find out how many electrons are in 1 gram?
Thursday, February 8, 2007 at 12:48pm by stephanie

chemisry
It would depend on the concentration of salicyclic acid in the solution.
Sunday, February 14, 2010 at 1:30am by bobpursley

Chemisry
How many moles of oxygen are present in 8g of oxgen gas.
Saturday, February 26, 2011 at 8:37am by Abba

Chemisry
because Bromine is one of the 7 Diatomic molecules.....so it is understood as Br2
Sunday, March 24, 2013 at 8:35pm by nicole

Chemisry
Ok I thinks thats what I may be confused on. I will def make sure I remember those. Thank You
Sunday, November 14, 2010 at 10:35pm by TMV

chemisry
1.29kg/2.0L * 1000g/kg * 1L/1000mL = 0.65g/mL
Thursday, September 5, 2013 at 8:24am by Steve

chemisry
I am having problems with this redox question. 3 Ag2S + 2Al ---6 Ag + Al2S3 What are the charges on each;
Wednesday, August 25, 2010 at 10:12am by Kelsey

chemisry
I am having problems with this redox question. 3 Ag2S + 2Al ---6 Ag + Al2S3 What are the charges on each;
Wednesday, August 25, 2010 at 10:13am by Kelsey

chemisry
compare and contrast the abilities of carbon, sodium, and neon to form chemical bonds?????
Monday, October 1, 2012 at 9:05pm by alex

chemisry
What's your problem with this? Substitute te numbers and calculate it. The 23.0C must be converted to kelvin.
Friday, March 30, 2012 at 10:36am by DrBob222

chemisry
Calculate how long it will take for the conctration of SO2Cl2 in the reactor in part (a) to fall to 1/4 of its initial value.
Thursday, May 30, 2013 at 11:36pm by Anonymous

chemisry
8. Write the structural formula of organic product that would result from the reaction: CH3—CH=CH2 + H2O->.
Wednesday, May 4, 2011 at 12:53am by cindy

chemisry
In order for a reaction to occur, particles must ______ in the proper _____ . What are the 2 words would be correctly fill in the blank? Thanks
Thursday, March 1, 2012 at 7:20pm by Misa

chemisry
How does the precision of a calculated answer compare to the precision of the measurements used to obtain it?
Sunday, April 27, 2008 at 7:15pm by paul

Chemisry
I would think this information would be available in your text and/or notes.
Wednesday, April 10, 2013 at 10:02am by DrBob222

chemisry
How are we supposed to know what expriment you are doing? I have no idea why Luis placed three cups in the freezer, much less why they were empty. Perhaps he was having a bad day.
Friday, February 26, 2010 at 11:16am by DrBob222

Chemisry
What is the nuclear charge of S^2- ion? (mass number=32). Also calculate the number of electrons, protons, and neutrons in it.
Monday, February 24, 2014 at 10:02pm by Taylor Beach

chemisry
If you have 32g of NH3 how many moles of NH3 is that?
Sunday, June 19, 2011 at 11:34pm by kelly

chemisry
M x mL = M x mL M x 75 = 6 x 52.5 Solve for M.
Wednesday, September 19, 2012 at 5:06pm by DrBob222

Chemisry
Why wouldn't it be KBr? Why are the twos added? How come its not just K + Br ==> KBr since their charges cancel out? Help!
Sunday, March 24, 2013 at 8:35pm by Amanda

chemisry
Cd/Cd2+//H+/H2/Pt Write the oxidation and reductionhalf reactions. Sketch a possible deisgn cell. I am unclear on the Pt portion and the charges ?
Monday, August 30, 2010 at 8:23am by Kelsey

chemisry
A solid metal is described as having "AN ARRAY OF POSITIVE IONS IN A SEA OF ELECTRONS". Write down the electronic structure of a magnesium atom and use it to explain what this PHRASE means? can you please help me with this question thanks
Monday, August 20, 2012 at 6:14pm by abdul ali

science help chemisry
I am doing my study guide for chem test - I cant find a good understadable answer for these 3 1. What is your definition of electrolysis? 2. How do you separate pure substances? 3. My book says mayonnaise is homogenous; teacher told the class it was heterogenous??? HELP
Sunday, October 4, 2009 at 10:01pm by sam

Chemisry
If 125 mL of a 6.00 M KNO3 solution is diluted with 100.0 mL of water, the molarity of the resulting solution would be
Wednesday, October 16, 2013 at 11:11pm by Anonymous

chemisry
Use the ideal gas equation to answer this question. (Recall that R is .0821 L · atm/K · mol. ) What pressure is exerted by .35 moles of a gas at 23 0 C if it is held in a container with a volume of 2.3 liters?
Friday, March 30, 2012 at 10:36am by Anonymous

Chemisry
Potassium, a silvery metal, reacts with bromine, a corrosive, reddish liquid, to yield potassium bromide, a white solid. Write the balanced equation, and identify the oxidizing and reducing agents.
Sunday, March 24, 2013 at 8:35pm by nana

Chemisry
Did you try EITHER of these? They look simple enough. I've done the easier of the two and left the harder one for you. If you don't understand any of the steps, repost with that and we can help you through BUT we aren't in the business of doing all of your homework. You need ...
Sunday, November 14, 2010 at 10:35pm by DrBob222

physical chemisry
Estimate the freezing point of 150 cm3 of water sweetened with 7.5g of sucrose (C12H11O22). (Kf for water is 1.86 K kg mol-1; density of water is 1gcm-3)
Tuesday, April 6, 2010 at 2:41pm by Anonymous

chemisry
2NaHCO3 --- Na2CO3 + H2O + CO2 2Fe + 6 HCl -- 2 FeCl3 + 3H2 2HBr + Ca(OH)2 -- CaBr2 + 2H2O N2 + 3H -- 2NH3 2H2O -- 2H2O + O is this a redox ? what is oxidized, reduced
Wednesday, August 25, 2010 at 9:46am by Kelsey

Chemisry
What is the minimum amount of 5.2M H2SO4 necessary to produce 22.8g of H2 (g) according to the following reaction? 2Al(s)+3H2SO4(aq)→Al2(SO4)3(aq)+3H2(g) (Please be precise and clear)
Tuesday, February 11, 2014 at 1:12pm by Tyler Jones

Chemisry
Yes I did try both of these I got #2 about five minutes ago on my own. The answer is 2N2H4(g)+N2O4(g)->3N2(g)+4H2O(g) and I tried the first problem and got: CO(g)+O(g)->CO2(g)
Sunday, November 14, 2010 at 10:35pm by TMV

Chemisry
6M HCl + 1M NaOH => NaCl + H2O If I'm understanding this correctly, all of the NaOH is used up because the molarity is 1 where the HCl's is 6 this leaves excess HCl correct?
Monday, August 26, 2013 at 6:37pm by Jenna

Chemisry
Glasses do not have slip systems Glasses are brittle at room temperature Glasses are amorphous and have no long range symmetry The volume of a sample of glass depends on its cooling rate
Wednesday, April 10, 2013 at 10:02am by An

chemisry
Calculate the density in g/mL {\rm g}/{\rm mL} of 2.0L {\rm L} of gasoline that weighs 1.29kg kg . Express your answer to two significant figures and include the appropriate units
Thursday, September 5, 2013 at 8:24am by Kristy

Chemisry
ASSUMING volumes are additive, which isn't exactly so, it will be 6.00M x (125/225) = ? or use the dilution formula mL1 x M1 = mL2 x M2 100*6.00 = 225*M2. Solve for M2.
Wednesday, October 16, 2013 at 11:11pm by DrBob222

chemisry
metallic bonds are not fully broken until the metal has first melted and then boiled. the boiling points of sodium, magnesium and aluminium are 890 c 1110 c and 2470 c respectively what does this suggest about the srengths of the metallic bonds in these three elements?
Monday, August 20, 2012 at 6:21pm by abdul ali

CHEMISRY
While in Israel you run into a group of people who are headed for the Rocky Mountains. You have always wanted to climb to the top of Pike's Peak and decide to join them. Pike's Peak has an altitude of 4300 m. What has happened to the atmospheric pressure?
Thursday, October 18, 2012 at 8:14am by Desiree

chemisry
metallic bonds are not fully broken until the metal has first melted and then boiled. the boiling points of sodium, magnesium and aluminium are 890 c 1110 c and 2470 c respectively what does this suggest about the srengths of the metallic bonds in these three elements? please ...
Wednesday, August 22, 2012 at 10:54am by jimbo

chemisry
Why does luis place 3 cups of water without any solute in the freezer? a. if some water spills, he will have extra b. the plain water is the control group c. he wants to know how long water takes to freeze d. the 3 cups of water are unnecessary to the experiment (b)
Friday, February 26, 2010 at 11:16am by mary1111

Chemisry
Atomic number = 16 from the periodic table. # p = 16. # e = 16 S^2- must have two more electrons. #p + #n = mass number. You know #p and mass number, calculate #n.
Monday, February 24, 2014 at 10:02pm by DrBob222

chemisry
A 0.125 gram sample if a monoprotic acid of unknown molar mass is dissloved in water and titrated with 0.1003 MNaOH. The endpoint is reached after adding 20.77 ml of base. What is the molar mass of the unknown acid?
Tuesday, May 4, 2010 at 10:57am by janny

chemisry
Cd ==> Cd^+2 + 2e 2H^+ + 2e ==> H2 Oxidation is loss of electrons. Reduction is the gain of electrons. Pt is an inert electrode and doesn't enter into the reaction. I would look in the text for how to draw the cell.
Monday, August 30, 2010 at 8:23am by DrBob222

Chemisry
mols S2O3^2- = M x L = ? mols I3^- = 1/2 that (look at the ionic equation) M = mols I3^-/L I3^-
Tuesday, October 1, 2013 at 9:50pm by DrBob222

Chemistry
Could anyone give a web about 1.Practical arts 2.Greek theory 3.Alchemy 4.Plogiston 5.Modern Chemisry Thanks:-) These are such broad subjects. My suggestion: Go to www.google.com and type in what you want to find. You will find, literally, thousands of links. The more specific...
Tuesday, July 10, 2007 at 8:06am by James

chemisry
An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the di- luted NaOH solution. Answer in units of M
Wednesday, September 19, 2012 at 5:06pm by cheri

Chemisry
What weight of potassium chlorite is required to prepare 89.6 mL of oxygen measured over water at 21.0 degrees Celsius at 743 millimeters of mercury (mmHg). The vapor pressure of water at 21.0 degrees Celsius is 18.65 mmHg
Thursday, December 12, 2013 at 9:29am by Amy

chemisry.Electrochemical Measurement of Concentrat
A calibration curve to show how the cell potential varies with [Cu2+] may be constructed. A plot of cell potential (in V, with the same sense as in question 1) versus log10[Cu2+] should yield a straight line. What is the slope of this line? The answer should be -0.0591/2 but ...
Monday, April 9, 2012 at 12:13am by Mahtab

Chemisry
Use chemical principles of atomic structure and or chemical bonding to explain each of the following. 1. At 25.0 degrees C and 1atm, F2 is a gas, whereas I2 is a solid. 2. The melting point of NaF is 993 degrees C, whereas the melting point of CsCl is 645 degrees C.
Sunday, January 27, 2008 at 7:17pm by Josh

Chemisry
what mass of protons would be required to just neutralize the charge of 1.0g of electrons? how do I answer this? You know the mass of an electron. Calculate how many are in 1 gram. You will need the same number of protons. Knowing the mass of a proton calculate the number ...
Thursday, February 8, 2007 at 12:48pm by Chris

Chemisry
5 mL methanol/25 g soln MeOH + H2O What is the mass of the methanol? mass = volume x density mass = 5 mL x 0.791 g/mL = about 4 g (but you should do it more accurately). (4/25)*100 = % m/m (weight/weight)
Saturday, February 23, 2013 at 11:45am by DrBob222

chemisry
What are the specializations of sanitary engineering? Drinking water supply Sewage Wastewater treatment 2) Name the different parts of the drinking water supply system? Production Storage Distribution 3) Which of the following three systems can be discerned when producing ...
Tuesday, September 24, 2013 at 11:55am by Anonymous

CHEMISRY
A SAMPLE OF 5.5L OF ARAGON DAS IS STORED IN A SYLINDER AT A TEMPERATURE OF 32.2C AND A PRESSURE 8.42 ATM. THE SAMPLE IS TRANSFERED COMPLETELY TO ANOTHER 2.8L CYLINDER. SEVERAL HOURS AFTER THE TRANSFER THE SECOND CYLINDER HAS OBTAINED A TEMPERATURE OF 60C. WHAT IS THE PRESSURE ...
Monday, January 8, 2007 at 10:05pm by TIFFANY

chemisry
HOH adds across the double bond forming CH3CH(OH)CH3 as the major component. http://en.wikipedia.org/wiki/Markovnikov%27s_rule
Wednesday, May 4, 2011 at 12:53am by DrBob222

Chemisry
The amount of I3–(aq) in a solution can be determined by titration with a solution containing a known concentration of S2O32–(aq) (thiosulfate ion). The determination is based on the net ionic equation Given that it requires 32.9 mL of 0.330 M Na2S2O3(aq) to titrate a 30.0-mL ...
Tuesday, October 1, 2013 at 9:50pm by DeJanee

chemisry
Q2. Distinguish between the following- 1. CH3OH and C2H5OH 2. Phenol and methanol 3. 1-Propanol and 2-Methyl-2-propanol 4. Ethenol and 1-propanol 5. Propanol and propanone 6. Acetaldehyde and benzaldehyde 7. Benzaldehyde and benzoic acid 8. Propanoyl Chloride and propanoic ...
Sunday, July 7, 2013 at 12:50pm by neha

physical chemisry
moles sucrose = grams/molar mass. Solve for moles. molality = moles sucrose/kg solvent. Solve for molality. delta T = Kf*molality. solve for delta T and from there the freezing point.
Tuesday, April 6, 2010 at 2:41pm by DrBob222

Chemisry
Please mark below all of the statments that correctly describe the physical properties of glass: 1.Glasses do not have slip systems. 2.Glasses consist of both covalent and ionic bonding. 3.Glasses are brittle at room temperature. 4.Glasses are amorphous and have no long range ...
Wednesday, April 10, 2013 at 10:02am by Anonym

Chemisry
2K + Br2 ==> 2KBr What is oxidation? The loss of electrons. (This is also the reducing agent). The gain of electrons is reduction. This is also the oxidizing agent. K goes from an oxidation state of zero to +1. Br goes from an oxidation state of zero to -1.
Sunday, March 24, 2013 at 8:35pm by DrBob222

Chemisry
What is the % M/M concentration of 5.00 mL of methanol in 25 g solution of methanol in water? The density of methanol is 0.791 g/mL. The density of water is 1.000 g/mL. The density of the solution is 0.995 g/mL. Please show work, thank you!
Saturday, February 23, 2013 at 11:45am by Rena

chemisry
A 0.1 molal solution of a weak monoprotic acid was found to depress the freezing point of water 0.1930C. Determine the Ka of the acid. You can assume 0.1 molal and 0.1 molar are equivalent. 100 ml of a 0.1M solution of the above acid is titrated with 0.1 M NaOH. After an ...
Sunday, February 12, 2012 at 3:16pm by ashley

Chemisry
1. You have the balanced equation. 2. How many mols H2 do you want? That's mols = grams/molar mass. 3. Using the coefficients in the balanced equation, convert mols H2 to mols H2SO4. 4. Then M = mols/L. You know M H2SO4 and mols H2SO4, solve for L H2SO4. This four step method ...
Tuesday, February 11, 2014 at 1:12pm by DrBob222

chemisry
for the unknown moles = mass/RMM we have the mass, but we need the number of moles to find RMM so number of moles of NaOH used is 0.1003 x 20.77/1000 this is the same as the number of moles of the unknown as it is a monoprotic acid. substitute the number of moles and the mass...
Tuesday, May 4, 2010 at 10:57am by Dr Russ

Chemisry
Your answer to #2 is correct. Very good. Your answer to #1 is not correct but see my first response for the correct answer. The reason yours is not correct is that oxygen gas, in the free state, is diatomic, meaning it is O2. If you've not seen this is may be of use. In the ...
Sunday, November 14, 2010 at 10:35pm by DrBob222

chemisry
A technician needs to determine the concentration of lead ions in a sample of water a) Suggest a test chemical that can be added to the water sample to preciitate the lead ions. Show a chemical euation for the formation of the precipitate b) after a precipitate forms, it is ...
Monday, August 16, 2010 at 7:09am by Kelsey

chemisry
Two half cells in a galvanic cell consist of one iron electroide in a solution of iron sulphate and a silver electrode in a silver nitrate solution a) Assume that the cell is operating as a galvanic cell. State the oxidation half reaction, the reduction half reaction and the ...
Wednesday, August 25, 2010 at 10:47am by Kelsey

Chemisry
Write a balanced equation using the correct formulas and include conditions (s,l,g or aq) for each of the following reactions. 1)Carbon monoxide gas reacts oxygen gas to produce carbon dioxide gas. Express your answer as a chemical equation. Identify all of the phases in your ...
Sunday, November 14, 2010 at 10:35pm by TMV

chemisry
How many grams are thee in 2.3times 10to the 23 power What units are you measuring with 2.3 * 10^23? Are they pounds, ounces, kilgromas or something else? Without this information, it is impossible to answer your question. Please repost with the needed information, so we can ...
Friday, January 5, 2007 at 10:45am by taylor

ap chemistry
https://www.google.com/search?q=AP+chemisry+diagnostic+test&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a#hl=en&client=firefox-a&hs=wUi&rls=org.mozilla:en-US:official&q=AP+chemistry+diagnostic+test&spell=1&sa=X&ei=bp5TUdypE6Sy2wWPhYAI&ved=0CC4QvwUoAA&...
Wednesday, March 27, 2013 at 8:50pm by DrBob222

chemisry
Fe^+2 + 2e ==> Fe Eo = ?? Ag^+1 + e ==> Ag Eo = ?? Look up Eo values for each, reverse the one with the larger negative value and add the two half cells. You should obtain a + voltage. a) oxidation occurs at the anode and reduction at the cathode; multiply the Ag ...
Wednesday, August 25, 2010 at 10:47am by DrBob222

chemisry
I'll get you started by helping with the first part. delta T = Kf*m 0.1930 = 1.86*m m = 0.1930/1.86 = 0.10376 (Since the delta T is to 4 significant figures, I've use more places in my answer. I don't know if that is 0.1M or 0.100 M so watch the number of s.f. when you do this...
Sunday, February 12, 2012 at 3:16pm by DrBob222

science help chemisry
I had an HSG 4 months ago. They ask you to not have sex berofe or after the procedure because when they dilate your cervix to put in the catheter, your risk for infection is very high. I actually work at the hospital where it was done and knew the tech, so it made it less ...
Sunday, October 4, 2009 at 10:01pm by fXirSCOio

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