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September 16, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
1. Find each mass & which has the greater mass. 1.0 ml mercury or 1.0 ml of water 2. Find each volume & which has greater volume. 100.g gold or 100. g water
Tuesday, September 4, 2012 at 1:47am

Chemistry
What is the specific gravity of alcohol having a density of .79 g/mL?
Tuesday, September 4, 2012 at 1:33am

Chemistry
Which car gets the best mileage? Car A gets 32 miles per gallon Car B gets 14 kilometers per liter
Tuesday, September 4, 2012 at 1:01am

Chemistry
Predict whether the following pairs of solute and solvent will result in a solution that completely dissolves. 1. Sodium chloride and water 2. Sodium benzoate and water 3. Sodium benzoate and 1M HCl 4. Benzoic acid and 1M NaOH
Tuesday, September 4, 2012 at 12:39am

Chemistry
What is the solubility of benzoic acid in room temperature water. Report this in grams/L.
Tuesday, September 4, 2012 at 12:37am

chemistry
If the half-life of a first-order decomposition reaction is 24.2 minutes, how long will it take for 10.0 moles of the reactant to decompose so that only 2.5 mol remains?
Tuesday, September 4, 2012 at 12:07am

chemistry
What volume of 2.50 x 10-4 M CV+ solution should be diluted to 10.0 mL to prepare a 7.50 x 10-5 M CV+ solution
Monday, September 3, 2012 at 11:56pm

Chemistry
The density of acetone, a common solvent found in nail polish remover, is 0.793g/mL. How much acetone (in g) is in a 450-mL bottle? How much acetone (in g) is in a 1.00-wuart bottle?
Monday, September 3, 2012 at 11:20pm

AP Chemistry
The reaction of 8.7 grams of fluorine with excess chlorine produced 3.9 grams of ClF3. What percent yield of ClF3 was obtained? Answer in units of %
Monday, September 3, 2012 at 10:59pm

AP Chemistry
For the reaction 3 FeCl2 + 2 Na3PO4 → Fe3(PO4)2 + 6 NaCl , what is the maximum amount of Fe3(PO4)2 which could be formed from 11.26 g of FeCl2 and 13.34 g of Na3PO4?
Monday, September 3, 2012 at 10:04pm

AP Chemistry
A 7.6 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 12.9 g. What was the mass of iron in the sample of ore? Answer in units of g
Monday, September 3, 2012 at 9:56pm

chemistry
How many oxygen atoms are present in 83.3 mg of salicylic acid?
Monday, September 3, 2012 at 9:51pm

chemistry
5.0% glucose has a specific gravity of 1.02. what is the mass of 470mL of glucose solution.
Monday, September 3, 2012 at 9:22pm

chemistry
Why is it important to list what you already know about a problem ?
Monday, September 3, 2012 at 8:36pm

Chemistry
What is wrong with the names 2-ethyl-4 and 4-dimethylpentane?
Monday, September 3, 2012 at 5:10pm

Chemistry
How do you figure out how mch oxygen gas escaped when Potassium Chlorate is decomposed in a reation? Also what mass of Potassium Chlorate was decomposed in the experiment? I conducted the experiement but don't know how to do this.
Monday, September 3, 2012 at 4:25pm

Chemistry
Given 1.7 g of hydrobromic acid (48%) calculate the number of mL. (MW HBr: 80.91 g/mol, density: 1.49 g/mL)
Monday, September 3, 2012 at 2:00pm

9th grade chemistry
what is the
Monday, September 3, 2012 at 1:09pm

chemistry
If 45 mL of .25 M HCl is required to completely neutralize 25.o mL of NH3, what is the concentration of the NH3 solution?
Monday, September 3, 2012 at 12:28pm

chemistry
What is the pH of an aqueous solution of a weakly acidic drug that is 40% dissociated and has a pKa =4.7?
Monday, September 3, 2012 at 12:24pm

chemistry
ethanol is a common laboratory solvent and has a density of 0.789 g/ml what is the mass in grams of 139 mL of ethanol
Monday, September 3, 2012 at 12:22pm

chemistry
if 14.7g of na reacts with 7.9g og br how many grams of nabr are found
Monday, September 3, 2012 at 12:14pm

chemistry
a 20*/* phosphoric acid solution has a density of 1.14g/ml.calculate the molality and molarity of the solution.
Monday, September 3, 2012 at 11:52am

Chemistry
A piece of metal weighing 20.32 grams is added to a flask with a volume of 24.5 cm3. It is found that 18.52 grams of water must be added to the metal to fill the flask. What is the density of the metal?
Monday, September 3, 2012 at 2:27am

organic chemistry
How many milliliters of boiling water are required to dissolve 25 g of phthalic acid? If the solution were cooled to 14 degree Cellucius, how many grams of phthalic acid would recrystallize out?
Sunday, September 2, 2012 at 11:23pm

Chemistry
Rank the following from most polar to least polar (aspirin, caffeine, ibuprofen, acetaminophen): I am getting caffeine>acetaminophen>aspirin>​ibuprofen. Is that correct?
Sunday, September 2, 2012 at 9:46pm

Chemistry
While in Europe, if you drive 123km per day, how much money would you spend on gas in one week if gas costs 1.10 \rm euros per liter and your car's gas mileage is 28.0mi/gal ?
Sunday, September 2, 2012 at 9:16pm

chemistry
calculate the density of a liquid if 47.9mL of it has mass of 49.06g
Sunday, September 2, 2012 at 7:54pm

chemistry
Sulfuric acid (H2SO4) is prepared commercially from elemental sulfur using the contact process. In a typical sequence of reactions, the sulfur is first burned: S + O2 → SO2 , then it is converted to SO3 using a catalyst: 2 SO2 + O2 → 2 SO3 . The resulting SO3...
Sunday, September 2, 2012 at 7:11pm

chemistry
A 12.8 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 21.3 g. What was the mass of iron in the sample of ore? Answer in units of g
Sunday, September 2, 2012 at 6:09pm

chemistry
At 25 degrees celsius, what is the mass in grams of 2.5L of mercury?
Sunday, September 2, 2012 at 4:02pm

AP Chemistry
how many milliliters of 0.125 M H2SO4 are needed to neutralize 0.200 g of NaOH?
Sunday, September 2, 2012 at 2:24pm

chemistry
A flask containing 5ml of 3M hcl solution required 14.45ml of 1M NAOH for titration. How many moles of hcl are present in the solution. The density of 3M hcl is 1.05g/ml My calculation 0.005 x 3 = 0.015m 0.01445 x 1 = 0.01445m Who helps me to solve it
Sunday, September 2, 2012 at 1:03pm

chemistry
chemical formulae which ends with ite,ate and ide
Sunday, September 2, 2012 at 9:18am

chemistry
many formulae which ends with ite,ate ide
Sunday, September 2, 2012 at 6:45am

chemistry
A flask containing 5.00ml of 3M hcl solution required 14.45 of 1.00M naoh for titration. How many moles of hcl are present in the solution? The density of 3M hcl is 1.05g/ml. My calculation 0.005L x 3M = 0.015 moles 0.01445 x 1m = 0.01445 moles Who helps me to solve it
Sunday, September 2, 2012 at 1:13am

chemistry
3960 J of heat are added to a 27.6 g sample of iron at 25 ◦ C. What is the final temperature of the iron? The specific heat of iron is 0.449 J/g · K. Answer in units of K
Sunday, September 2, 2012 at 12:55am

chemistry
Water is 11.2% by mass hydrogen. How many kilograms of water would contain 5.0g of hydrogen. (using conversion factors)
Saturday, September 1, 2012 at 10:09pm

chemistry
water is 88.8% by mass oxygen. How many grams of water would contain 2.25kg of oxygen?
Saturday, September 1, 2012 at 9:00pm

chemistry
calculate the delta G rxn O2(g)+2 H2o(l)+2 Cu(s)--> 4 OH-(aq)+2 Cu^2+(aq)
Saturday, September 1, 2012 at 6:44pm

Chemistry
what volume, in L, of a 10.0M HCL solution is needed to make 2.00L of 2.00m HCL solution by dilution with water. Thank you
Saturday, September 1, 2012 at 12:40pm

chemistry
if 36.23mL of a standard 0.1959M NaOh solution is required to neutralize 25.00mL of H2SO4. what is the Molarity of the acid solution, balance the equation. Please help with calculation. Thank you for your help.
Saturday, September 1, 2012 at 12:28pm

chemistry
20.0 mL of a 0.125 M solution of potassium iodide is added to 15.0 mL of a 0.235 M solution of lead (II) nitrate. A reaction occurs via the balanced equation below: 2KI(aq)+ Pb(NO3)2(aq) --> 2KNO3(aq) +PBI2(ppt) How much product can theoretically be produced in the reaction...
Saturday, September 1, 2012 at 12:26pm

chemistry
a ballon holds 26kg of helium. what is the volume of the balloon if the pressure is 1.15 atm and the temperature is 23 degree celsus
Saturday, September 1, 2012 at 9:35am

chemistry
Calculate the heat outflow when 2 kg of dry saturated steam at 8.0 bar is converted into ice at -lO0C.
Saturday, September 1, 2012 at 8:57am

Chemistry
4 L of oxygen at a pressure of 400 Kpa and 1L of nitrogen at 200 Kpa were introduced in to 2 L vessel. (A)What is the total pressure of the gases in the vessel. (B)What is the mole fraction of each gas?
Saturday, September 1, 2012 at 7:08am

Chemistry
A solution contains 15 g non-volatile non-electrolyte solute C6H14O6 dissolved in 500 g of water at 40 c. Calculate (A)Vapor pressure of the solution. (B)Boiling point of the solution. (C)Freezing point of the solution.
Saturday, September 1, 2012 at 3:55am

Chemistry
H2SO4 solution containing 200.1 g of H2SO4 in 0.3500 L OF solution has a density of 1.3294 g/ml.calculate (A) Mass%H2SO4(m/m) (B)mass%H2O(m/m) (C)Molarity (D)Molality
Saturday, September 1, 2012 at 3:20am

Chemistry
H2SO4 solution containing 200.1 g of H2SO4 in 0.3500 L OF solution has a density of 1.3294 g/ml.calculate (A) Mass%H2SO4(m/m) (B)mass%H2O(m/m) (C)Molarity (D)Molality
Saturday, September 1, 2012 at 3:09am

chemistry
A chemist must dilute 55.6 ml of 1.48 M aqueous silver nitrate (AgNO3) solution until the concentration falls to 1.00M. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in milliliters. Round your ...
Friday, August 31, 2012 at 8:28pm

Chemistry
A rock sample contains only Sb2S3 and FeS. If 835g of the sample contains 11.2% antimony, what is the mass percent of the Sb2S3 in the sample? What is the mass percent of the sulfur in the sample? So far, I have determined that 11.2% of an 835g sample is 93.52g Sb, the molar ...
Friday, August 31, 2012 at 6:51pm

General Chemistry
A freshman is currently enjoying the Arts Studio program she is pursing at a well-know university. In her free time, she like to skate, take salsa dance lessons, and cook. She particularly enjoys pickling and decides to pickle olives over a lesisurely weekend. Accordng to the ...
Friday, August 31, 2012 at 6:35pm

Chemistry/Math
I'm not sure how to approach this problem. The teacher wants volumetric flow rate (in cm). A commonly used rule of thumb is that average velocity in a pipe should be about 1 m/s or less for "thin"(viscosity about water). If a pipe needs to deliver 6,000 m^3 of ...
Friday, August 31, 2012 at 2:33pm

college chemistry
Rank from highest to lowest vapor pressure.CH3CH2CH2CH2OH,CH4,CH3CHCH2CH3C​H3,CH3CH2CH2CH2CH3
Friday, August 31, 2012 at 2:33pm

chemistry
A chemist want to make a 10% Chlorine solution from 30% Chlorine solution and pure water. How much of the two should the chemist mix together to make 20mL. Please help with calculations. Thank you
Friday, August 31, 2012 at 10:53am

chemistry
Provide a synthesis of the following aldehyde starting from ethylene. Show the reagents and products for each step. H2C=CH2 --> CH3-CH2-CH=O Try to be as clear as possible. Thanks!
Friday, August 31, 2012 at 4:47am

Chemistry
Express each result to the correct # of significant figures 1. 8.27 x (4.987 - 4.96) 2. (9.5 + 4.1 +2.8 +3.175)/4 3. (9.125 - 9.02) / 9.125 x 100
Friday, August 31, 2012 at 3:00am

chemistry
A 28.6 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 10.1 grams. What was the percent iron in the sample of ore?
Thursday, August 30, 2012 at 10:19pm

chemistry
A 33.8 g sample of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 20.7 g. What was the mass of iron in the sample of ore?
Thursday, August 30, 2012 at 10:18pm

chemistry
An ore contains Fe3O4 and no other iron. The iron in a 38.8-gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 25 g. What was the mass of Fe3O4 in the sample of ore?
Thursday, August 30, 2012 at 10:18pm

chemistry
An ore contains Fe3O4 and no other iron. The iron in a 27.07 gram sample of the ore is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 21.9 grams. What was the percent Fe3O4 in the sample of ore?
Thursday, August 30, 2012 at 10:18pm

chemistry
The reaction of 9.3 grams of fluorine with excess chlorine produced 4.1 grams of ClF3. What percent yield of ClF3 was obtained?
Thursday, August 30, 2012 at 10:17pm

chemistry
The height of a stack of 5 pennies is 0.72 cm and the radius of the stack is 0.91 cm. The volume in mL of this stack of 5 pennies is...
Thursday, August 30, 2012 at 10:10pm

Chemistry
What chemical compound is formed in the reaction when 6M HCl and 1M NaOH is reaction?
Thursday, August 30, 2012 at 9:44pm

Chemistry
How do I calculated the mass and moles of nitric acids when only given 2ml of concentrate nitric acid
Thursday, August 30, 2012 at 4:46pm

Math/Chemistry PLS HELP
Find the absolute and percent relative uncertainty and express each answer with a reasonable amount of significant figures. 9.2(+ or -0.7)*(0.0054(+-0.3)+0.0056(+-0.7) The Algebraic answer: 0.1012 Absolute error? Relative error %?
Thursday, August 30, 2012 at 4:01pm

chemistry
quick question, if concentrate nitric acid is listed as 70% w./w. what's the other 30 percent of the concentrated HNO3 solution?
Thursday, August 30, 2012 at 3:47pm

chemistry
How many milliliter of conc. HNO3 would be necessary to prepare 500ml of 20% of HNO3 solution?
Thursday, August 30, 2012 at 3:25pm

Chemistry 314
Five mineral samples of equal mass of calcite, CaCO3 (MM 100.085) , had a total mass of 12.4 ± 0.1 g. What is the average mass of calcium in each sample? (Assume that the relative uncertainties in atomic mass are small compared the uncertainty of the total mass.) (Input...
Thursday, August 30, 2012 at 2:52pm

chemistry
A volume of 29.62 ± 0.05 mL of HNO3 solution was required for complete reaction with 0.8896 ± 0.0008 g of Na2CO3, (FM 105.988 ± 0.001). Find the molarity of the HNO3 and its absolute uncertainty. I have the molarity of HNO3 = 0.5667
Thursday, August 30, 2012 at 2:52pm

Chemistry
Can someone direct me on the question below? I am not sure how to work this problem. Thank you. Chambers A and B are separated by a membrane. Chamber A contains 15.7 M KNO3 and chamber B contains 10.98 M KNO3. If K+ is in equilibrium across the membrane, what is the electrical...
Thursday, August 30, 2012 at 1:19pm

Chemistry
what is the amount of heat required to heat 3.3kg of gold from 29 degrees celcius to 61 degrees celcius?
Thursday, August 30, 2012 at 12:23pm

chemistry
While in Europe, if you drive 107 per day, how much money would you spend on gas in one week if gas costs 1.10 per liter and your car's gas mileage is 42.0 ? Assume that 1 euro=1.26 dollars
Thursday, August 30, 2012 at 12:05pm

chemistry
what is the vapor pressure of alcohol in 25 degree celcius? the answer should be answered in millimeter mercury. tnx^_^
Thursday, August 30, 2012 at 5:48am

Chemistry
100 ml of 0.01N HCl is added to 0.9L of distilled water. What would the final pH of the solution be?
Thursday, August 30, 2012 at 1:05am

chemistry
The peanut studied had a mass of 0.609 g before combustion and 0.053 g after combustion. The energy released during combustion caused a 14.2 degree Celsius increase in the temperature of 200.0 mL water in the calorimeter. Calculate the mass of peanut burned.
Thursday, August 30, 2012 at 12:20am

chemistry
350 calories of heat is added to a sample of nitrogen gas and the temperature is increased by 89 degrees Celsius. What is the mass of the nitrogen sample in cal/gram Celsius?
Thursday, August 30, 2012 at 12:07am

Chemistry
A volume of 29.62 ± 0.05 mL of HNO3 solution was required for complete reaction with 0.8896 ± 0.0008 g of Na2CO3, (FM 105.988 ± 0.001). Find the molarity of the HNO3 and its absolute uncertainty. I have the molarity of HNO3 = 0.5667
Wednesday, August 29, 2012 at 10:39pm

Chemistry
Five mineral samples of equal mass of calcite, CaCO3 (MM 100.085) , had a total mass of 12.4 ± 0.1 g. What is the average mass of calcium in each sample? (Assume that the relative uncertainties in atomic mass are small compared the uncertainty of the total mass.) (Input...
Wednesday, August 29, 2012 at 10:36pm

chemistry
could the products ever become the reactants in chemical reaction? explain. thanks!
Wednesday, August 29, 2012 at 8:57pm

10th grade honors chemistry
1.3 pounds of a material with a density of 3.7 g/mL would occupy what volume in liters?
Wednesday, August 29, 2012 at 8:33pm

aP Chemistry
The net ionic equation for ALL aqueous reac- tion of strong acids and strong soluble bases that form soluble salts is 1. the formation of the soluble salt. 2. the formation of water from the ele- ments. 3. the formation of H2O from H and OH . 4. the formation of water and the ...
Wednesday, August 29, 2012 at 7:33pm

chemistry
Two liquids of different densities (ρ1 = 1500 kg/m3, ρ2 = 500 kg/m3) are poured together into a 100 L tank, filling it. If the resulting density of the mixture is 800 kg/m3, find the respective masses of the liquids used.
Wednesday, August 29, 2012 at 3:56pm

chemistry
how much heat is released wen 10g of steam at 100 degrees c is cooled to 10g of liquid water at 100degrees c?
Wednesday, August 29, 2012 at 2:19pm

Chemistry
I've been studying the transesterification of dimethyl carbonate to diphenyl carbonate, and experimental equilibrium constant (K) values range from 0 to 0.5 at temperatures from 298 to 450 Kelvin. My question is: How do we make a reaction more spontaneous or how do ...
Wednesday, August 29, 2012 at 12:03pm

Chemistry
Need Help!! Describe how to make 2.5L of 0.1M HCL solution from 12M HCL concentrated solution and water. I got help earlier but still could not figure out the calculations. Please help, it has been a while since i took chemistry. Thank you soo much
Wednesday, August 29, 2012 at 1:08am

Chemistry
Describe how to make 2.5L of 0.1M HCL solution from 12M HCL concentrated solution and water. Thank you
Wednesday, August 29, 2012 at 12:36am

chemistry
3.21 g of calcium carbonate is dissolved into 250.0 mL of water to make a homogenous solution. What is the concentration os this solution?
Tuesday, August 28, 2012 at 10:17pm

chemistry
a silicon chip weighs approx 2.3*10-4. how many chips can you mak ewith 1kg of silicon?
Tuesday, August 28, 2012 at 9:31pm

chemistry
3.21 g of calcium carbonate is dissolved into 250.0 mL of water to make a homogenous solution. What is the concentration os this solution?
Tuesday, August 28, 2012 at 8:56pm

Chemistry
how many grams if sulfur must be dissolved into 1L of water to make a 2 molar solution?
Tuesday, August 28, 2012 at 8:24pm

chemistry
the density of water at 40c is 0.992g/mL. what is the volume of 1.95 of water at this temperature
Tuesday, August 28, 2012 at 8:04pm

chemistry
Calculate the Molecular Weight (MW) of a hydrocarbon as if 0.5813 g of this gas completely fills a 250.0 mL flask at a temperature of 24.4 C and pressure of 742.6 mmHg. Show all work and assume ideal behavior.
Tuesday, August 28, 2012 at 7:40pm

chemistry
E=hv h=6.6E-34Js E=5.1E-22k E/h=v 5.1E-22k/6.6E-34Js =
Tuesday, August 28, 2012 at 4:44pm

Chemistry
How many grams of SO3 are needed to make 250 ml of 0.750 molar solution?
Tuesday, August 28, 2012 at 3:43pm

chemistry
A nickel is found to have a mass of 5.06 grams. Using unit analysis, show what the mass of this nickel is in ounces.
Tuesday, August 28, 2012 at 3:32pm

Chemistry
Isopropyl alcohol evaporated from a beaker at the rate of 1.057 mL/min. how many seconds would it take for 3.70 mL of water to be lost? thanks for helping!
Tuesday, August 28, 2012 at 3:05pm

Chemistry
Calculate the molarity of the solutions made by dissolving the following amounts of solute in water and making the volume up to the stated value. 5.0mol nitric acid in 2.0L Do I just find the molarity for nitric acid only, because when I write out the balanced equation, the ...
Tuesday, August 28, 2012 at 3:43am

chemistry
why does ammonia reacts with acid?
Tuesday, August 28, 2012 at 3:00am

chemistry
the density of alcohol is 0.789 g/ ml at 20 degree celcius . calculate the mass of a 30 ml sample?
Tuesday, August 28, 2012 at 2:59am

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