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April 24, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
A mass of 0.4113 g of an unknown acid, HA, is titrated with NaOH. If the acid reacts with 28.10 mL of 0.1055 M NaOH, what is the molar mass of the acid?
Saturday, April 28, 2012 at 2:23pm

Chemistry
If 0.150 moles of salicylic acid and execs acetic anhydride are used during a synthesis of aspirin, how many grams of aspirin will be obtained if the reaction gives a 38% yield?
Saturday, April 28, 2012 at 2:20pm

chemistry 2
How many amperes would be needed to produce 60 g of magnesium during the electrolysis of molten MgCl2 in 2 hours?
Saturday, April 28, 2012 at 12:36pm

chemistry
How many moles of gas must be forced into a 3.7L ball to give it a gauge pressure of 8.4psi at 23degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.6psi so that the total pressure in the ball is 23.0psi
Saturday, April 28, 2012 at 11:24am

Chemistry
a gas misture containing N2 and O2 was kept inside a 2.00 L container at a temp of 23.0 degrees C and a total pressure of 1.00atm. The partial pressure of O2 was 0.722atm. How many grams of Nitrogen were present in the mixture?
Saturday, April 28, 2012 at 11:11am

Chemistry
what mass of sodium chloride will be required to completely react with 4.00 x 10(24) units of AgNO3 and form AgCl and sodium nitrate?
Saturday, April 28, 2012 at 11:09am

Chemistry
assume equal masses of the following substances, all of them at 20.0 degrees C and exposed to the same source of heat simultaneously. Which substance will reach a temp of 35.0 degress faster? aluminium sp 0.900 lead sp 0.128 titanium sp 0.523 tin sp 0.222
Saturday, April 28, 2012 at 11:07am

chemistry
An air sample contains 0.032%CO2 .If the total pressure is 756mmHg , what is the partial pressure ofCO2 ?
Saturday, April 28, 2012 at 1:28am

chemistry
A sample of gas has a mass of 0.555g . Its volume is 114L at a temperature of 80degrees C and a pressure of 744mmHg .Find the molar mass of the gas
Saturday, April 28, 2012 at 1:27am

Chemistry
When the equation for the following reaction in basic solution is balance, what is the sum of the coefficients? MnO2 + HO2^1-.....>MnO4^1- A=11 B=31 C=14 D=9
Saturday, April 28, 2012 at 1:05am

chemistry
An experiment shows that a 111ml gas sample has a mass of 0.161g at a pressure of 725mmHG and a temperature of 36degrees C.What is the molar mass of the gas?
Saturday, April 28, 2012 at 1:00am

chemistry
How many moles of gas must be forced into a 3.1L ball to give it a gauge pressure of 9.8psi at 22degrees C? The gauge pressure is relative to atmospheric pressure. Assume that atmospheric pressure is 14.5psi so that the total pressure in the ball is 24.3psi .
Saturday, April 28, 2012 at 12:57am

chemistry
A cylinder contains 12.0L of air at a total pressure of 44.0psi and a temperature of 35degrees C.How many moles of gas does the cylinder contain?
Saturday, April 28, 2012 at 12:56am

chemistry
A gas sample with a volume of 5.3L has a pressure of 745mmHg at 33degrees C.What is the pressure of the sample if the volume remains at 5.3L but the temperature rises to 79degres C?
Saturday, April 28, 2012 at 12:55am

chemistry
A scuba diver takes a 2.3L balloon from the surface, where the pressure is 1.0atm and the temperature is 37degrees C, to a depth of 35m, where the pressure is 4.5atm and the temperature is 18degrees C.what is the final volume at this depth?
Saturday, April 28, 2012 at 12:40am

chemistry
How many grams of hydrogen are collected in a reaction where 1.80L of hydrogen gas is collected over water at a temperature of 40degrees C and a total pressure of 738torr?
Saturday, April 28, 2012 at 12:35am

chemistry 2
A voltaic cell is constructed with an Ag/Ag+ half-cell and a Pb/Pb2+ half-cell. Measurement shows that thesilver electrode is positive. -Write balanced half-reactions and the overall spontaneous reaction.
Friday, April 27, 2012 at 11:00pm

chemistry
2-octanol and 1-phenilethanol. which one more polarity?
Friday, April 27, 2012 at 10:44pm

Chemistry
based on the following chemical equation HCN+O2 yields N2+CO2+H20 identify the limiting reactants and the mass of N2 produced when 100.0g of HCN react with 100.0g of O2. a. the limiting reactant is HCN and 25.9g of N2 are produced b. the limiting reactant is O2 and 35.0g of N2...
Friday, April 27, 2012 at 10:39pm

chemistry
what will be the final temperature of a system in which 150.0g of water at 5.0 degrees C are added to 1.00L of water at 90.5 degrees C?
Friday, April 27, 2012 at 10:31pm

Chemistry
In a 0.05M solution of a weak monoprotic acid,[H+]=.0018.What is its Ka?
Friday, April 27, 2012 at 10:30pm

chemistry
what mass of water at 10.0 degrees C is needed to cool 500.0ml of tea from 25.0 degrees C to 18.3 degrees C? Density and specific heat of the tea are the same as water.
Friday, April 27, 2012 at 10:30pm

Chemistry
the heat of fusion water is 335J/g,the heat of vaporization of water is 2.26kJ/g, the specific heat of water is 4.184J/deg/g. how many grams of ice at 0 degrees could be converted to steam at 100 degrees C by 9,574J
Friday, April 27, 2012 at 10:15pm

Chemistry
Calculate the mass of each compound containd in 60g of a 4.5%m/m CaCl2(aq)solution
Friday, April 27, 2012 at 10:09pm

Chemistry
A fossil is found to have a C-14 level of 86% compared to living organisms. How old is the fossil?, (the half life of C14 is 5730 years).
Friday, April 27, 2012 at 9:00pm

Chemistry
which of thh following reactants would you add to an aqueous solution of ammonium sulfate in order to precipitate quantitatively all the sulfate? A. CaCl2 b. Al(NO3)3 c. Zn(C2H3)2)2 d. KBr
Friday, April 27, 2012 at 8:45pm

Chemistry
An ice cube at 0.00 degree celsius with a mass of 23.5 g is placed into 550.0 g of water, initially at 28.0 degree celsius, in an insulated container. Assuming that no heat is lost to the surroundings, what is the temperature of the entire water sample after all the ice has ...
Friday, April 27, 2012 at 8:06pm

chemistry
what is the hcl of 2.00x 10 squared mL of 0.51
Friday, April 27, 2012 at 7:23pm

chemistry
1.0 M aqueous solutions of AgNO3 , Cu(NO3 )2 and Au(NO3 ) 3 are electrolyzed in the apparatus shown, so the same amount of electricity passes through each solution. If 0.10 moles of solid Cu are formed how many moles of Ag and Au are formed?
Friday, April 27, 2012 at 6:20pm

Chemistry
A heliox deep-sea diving mixture delivers an oxygen partial pressure of 0.20 atm when the total pressure is 13.0atm .What is the partial pressure of helium in this mixture?
Friday, April 27, 2012 at 5:23pm

Chemistry
3.42 grams of Ba(OH)2 is placed in a flask, dissolved in water, and titrated with an HCI solution. It is found that 25.0mL of the HCI solution is required to just neutralize the Ba(OH)2. What is the molarity of the HCI solution?
Friday, April 27, 2012 at 4:45pm

Chemistry
Suppose that 50.0mL of 0.240M sulfric acid requires 36.0mL of KOH solution to reach its endpoint. What is the molarity of the KOH solution?
Friday, April 27, 2012 at 4:43pm

Chemistry
The reaction (nitrogen monoxide reacts with hydrogen gas to form nitrogen gas and water vapor) is believed to take place in three steps, the first of which is the fast reversable dimerization of NO to form N2O2, and the last of which is the reaction N2O + H2 -> N2 + H2O. (i...
Friday, April 27, 2012 at 4:19pm

Chemistry
Consider a process in which an ideal gas is compressed to one-sixth of its original volume at constant temperature. Calculate the entropy change per mole of gas.
Friday, April 27, 2012 at 4:00pm

Chemistry
Consider a process in which an ideal gas is compressed to one-sixth of its original volume at constant temperature. Calculate the entropy change per mole of gas. I know that the formula is chg.entropy= nRln(V2/V1), but how do I get the values for V2 and V1?
Friday, April 27, 2012 at 3:19pm

Chemistry
A solution of .12 mol/L of phosphoric acid completely neutralizes .20L of a solution of sodium hydroxide with.a concentration of .15mol/L What is the neutralizing volume of the phosphoric acid?
Friday, April 27, 2012 at 2:46pm

chemistry
For each of the following precipitation reactions, calculate how many grams of the first reactant are necessary to completely react with 17.5 of the second reactant.
Friday, April 27, 2012 at 1:25pm

chemistry
an empty glass tube weights 37.3 g. when filled to the rim with water is weighs 54.1g. what is the volume of the glass tube?
Friday, April 27, 2012 at 1:00pm

chemistry
you add 13.7g HCL to water and make 500 mL solution. what will the solutions osmotic pressure be?
Friday, April 27, 2012 at 12:51pm

chemistry
an empty jar weighs 1.43 pounds. How much will it weigh when 1.00L of homgenized milk is poured into it? trhe density of homogenized milk is 1.03g/ml. (1 pound= 453.6g)
Friday, April 27, 2012 at 12:49pm

Environmental Chemistry
The Henry’s Law Constant for dimethyl sulfide is 0.14 mol/L-atm. Its atmospheric concentration is 0.001 ppb (i.e., 0.001µg/L). Calculate the dissolved concentration of dimethyl sulfide in water.
Friday, April 27, 2012 at 10:45am

chemistry
Using the half-reaction method, balance the redox reaction below. Show your work; partial credit will be given. I- + Br2 → IO3- + Br- Write the reduction and oxidation half-reactions. Balance them for atoms. Balance each of the half-reactions for charge. Multiply the ...
Friday, April 27, 2012 at 10:23am

chemistry
Using the change-in-oxidation-number method, balance the redox reaction below. Show your work; partial credit will be given. NO2– + MnO4– → NO3– + Mn2+ Figure out which atoms’ oxidation numbers are changing, and by how much. Balance the equation for ...
Friday, April 27, 2012 at 10:23am

chemistry
What is the general form of a common automobile battery? How many electrodes does a car battery use? Does it use an acidic aqueous electrolyte solution? Is the battery rechargeable? Is the battery voltaic or electrolytic when discharging? Is the battery voltaic or electrolytic...
Friday, April 27, 2012 at 10:23am

chemistry
Several things stand in the way of hydrogen fuel cells becoming widely used. Is it easy or difficult to store enough hydrogen to fuel a car? Is the technology expensive or cheap? Is the infrastructure present?
Friday, April 27, 2012 at 10:23am

chemistry
Determine the emf for the cell noted below. (For Co3+(aq) + e- → Co2+(aq), E0 = 1.80 V, and for Na+(aq) + e- → Na(s), E0 = -2.71 V.) Na(s) | Na+(aq) || Co3+(aq), Co2+(aq) | Co(s) What is being oxidized? What is being reduced? What has the more positive reduction ...
Friday, April 27, 2012 at 10:22am

chemistry
When setting up an electroplating system, how do you set up the terminals of the voltage source to the anode and cathode? Does oxidation or reduction happen at the cathode? What does this require? Based on your answer, to which terminal of the battery would you attach the ...
Friday, April 27, 2012 at 10:22am

chemistry
A voltaic cell is made with aluminum and zinc electrodes. (For Ag+(aq) + e- → Ag(s), E0 = 0.80 V and for Cu2+(aq) + 2e- → Cu(aq), E0 = 0.34 V)On the diagram below, draw and label: the salt bridge, the electrical connection between the two jars, the anode and ...
Friday, April 27, 2012 at 10:22am

Chemistry
What physical properties will the ionic compound CaSO4 be expected to have?
Friday, April 27, 2012 at 10:12am

Chemistry
Mg>Al>Ca>Rb>I
Friday, April 27, 2012 at 9:04am

Chemistry
1. What mass of carbon is required to produce 100kj of heat, when burned in air? Enthalpy change = -392kj. 2. What mass of methanol is required to produce 1000kj of heat, when burned in air?
Friday, April 27, 2012 at 9:04am

chemistry
am in need of help with my final project in Geology. I have to create a 12-15slide powerpoint presentation on Factors and Forces of Geological Features, The Barnett Shale. I have the final rubric Final Rubric: |Factors and Forces of Geological Features Objective of Exercise...
Friday, April 27, 2012 at 6:14am

Chemistry
What are the possible values of the azimutal quantum number for an electron in the 4f subshell?
Friday, April 27, 2012 at 5:02am

Chemistry
Hydrogen atoms are excited to the stationary state designated by the principal quantum number, n= 4. What will be the number of lines(frequencies) emitted by the hydrogen atoms?
Friday, April 27, 2012 at 4:59am

Chemistry
The solubility of NH4CL is 50g/100g of water at 50°C. How many grams of NH4CL will dissolve in 20 g of water?
Friday, April 27, 2012 at 1:07am

chemistry
Ethylene glycol, C2H6O2, is used as antifreeze for automobile engines. If you want to produce 2.00 kg of ethylene glycol from the reaction of C2H4Cl2 and Na2CO3, what is the minimum amount of Na2CO3 that is needed? C2H4Cl2(l) + Na2CO3(s) + H2O(l)=C2H6O2(l) + 2NaCl(aq) + CO2(g)
Friday, April 27, 2012 at 12:25am

Chemistry
Codeine is added to 100ml of water until the solution concentration is 0.800M. What is the pH of this solution?
Thursday, April 26, 2012 at 11:57pm

chemistry
Determine the heat of combustion of ethanol by using the bond energies
Thursday, April 26, 2012 at 11:57pm

chemistry
0.82g of an unknown gass is at 30 degrees C in 3L container at a pressure of 15.9psi. What is the molecular weight of the unknown gas?
Thursday, April 26, 2012 at 11:56pm

chemistry
Calculate the total amount of heat (in calories) that would be required to convert 15.0 g of ice at 0 oC to 15.0 g of steam at 100 oC.
Thursday, April 26, 2012 at 11:56pm

chemistry
31.0mL sample of LiOH, concentration unknown, is titrated with .52 M HCl. It takes 42.9 ml of HCl to reach the endpoint. What is the concentration of the base?
Thursday, April 26, 2012 at 11:35pm

chemistry
(ppm and ppb are sooo not easy for me to get)c A saturated solution of PbCO3 contains 0.00011 g PbCO3 in 100. g of water. What is this concentration in parts per million?
Thursday, April 26, 2012 at 11:24pm

chemistry
Why does a change in pH usually produce a change in the ability of an enzyme to act as a catalyst? A. When the pH changes, the enzyme may lose its native conformation and lose its ability to function as a catalyst. B. When the pH changes, enzymes are surrounded by a solvation ...
Thursday, April 26, 2012 at 11:21pm

Acid/base chemistry
if the pH of rain water is 5.6 on average what is the concentration of carbonic acid in rain water?
Thursday, April 26, 2012 at 11:11pm

chemistry
According to molecular view, kinetic energy, what happens when 2 tablespoons each of water, methylated spirit and petrol are put in an open container separately in relation to time and the rate of vaporisation?
Thursday, April 26, 2012 at 10:59pm

chemistry
N2+2H2=N2H4 What is the concentration of H2 at equalibrium when (N2)=.033 and (N2H2)= .042 M? Keq=5.29
Thursday, April 26, 2012 at 10:58pm

chemistry
Most community water supplies have 0.50 ppm of chlorine added for purification. What mass of chlorine must be added to 134.0 L of water to achieve this level? anwser grams
Thursday, April 26, 2012 at 10:56pm

chemistry
What volume of solution would be needed to deliver the stated amount of solute? 237 milligrams of solute from a solution that is 32.0 ppm? answer in liters
Thursday, April 26, 2012 at 10:53pm

chemistry
EXTRA CREDIT QUESTION(this is like kinda really hard for me at the moment i got the first one but the others not so much) The city of Celina was ordered by the Ohio EPA in 2003 to resolve its MCL (maximum contaminant level) violations of its drinking water. The Celina water ...
Thursday, April 26, 2012 at 10:52pm

chemistry
According to molecular view, kinetic energy, what happens when 2 tablespoons each of water, methylated spirit and petrol are put in an open container separately in relation to time and the rate of vaporisation?
Thursday, April 26, 2012 at 10:52pm

chemistry
According to molecular view, kinetic energy, what happens when 2 tablespoons each of water, methylated spirit and petrol are put in an open container separately in relation to time and the rate of vaporisation?
Thursday, April 26, 2012 at 10:50pm

chemistry
What is the net charge on Phe-Asp at each pH? a. pH 1 b. pH 7 c. pH 14
Thursday, April 26, 2012 at 10:46pm

chemistry
a. What is the net charge on valine at pH 1? b. at pH 7? c. at pH 14?
Thursday, April 26, 2012 at 10:46pm

chemistry
Why does a change in pH usually produce a change in the ability of an enzyme to act as a catalyst? A. When the pH changes, the enzyme may lose its native conformation and lose its ability to function as a catalyst. B. When the pH changes, enzymes are surrounded by a solvation ...
Thursday, April 26, 2012 at 10:41pm

chemistry
A sample of water is analyzed and found to contain 18.6 ppb of arsenic. If a person were to drink 2.0 L of this water per day for 1.4 years, what is the maximum amount of arsenic they could accumulate in their body? Assume that 1 year = 365 days anwser________ grams or arsenic
Thursday, April 26, 2012 at 10:39pm

chemistry
What volume of solution would be needed to deliver the stated amount of solute? 39.0 grams of solute from a solution that is 16.0 % m/v? (anwser in milliliters
Thursday, April 26, 2012 at 10:23pm

chemistry
If 27.3 g of NaNO3 are needed, what volume of a 5.78 % w/v solution will provide this mass?
Thursday, April 26, 2012 at 10:17pm

chemistry
4NH3(g)+5O2(g) yield 4NO(g)+6H2O(g) Deduce the equilibrium constant expression for the reaction.
Thursday, April 26, 2012 at 10:15pm

chemistry
If 90 mL of laundry bleach containing a 5.0% w/v concentration of sodium hypochlorite is recommended per load of laundry, what mass of sodium hypochlorite is being used per load?
Thursday, April 26, 2012 at 10:09pm

Chemistry
What mass of solid potassium nitrite would need to be dissolved in 500. mL of 0.40 M HNO2 to make 500. mL of a NO2−/HNO2 buffer solution that has a pH = 3.25? Ka of HNO2 = 7.1 x 10−4. (Assume no significant volume change during dissolution of the potassium nitrite...
Thursday, April 26, 2012 at 9:59pm

chemistry
Calculate the percent by mass of the solute in each of the following aqueous solutions. (a) 5.10 g of NaBr in 78.2 g of solution
Thursday, April 26, 2012 at 9:47pm

chemistry
Calculate the concentration in parts per million (ppm) of the solute in each of the following aqueous solutions (a) 0.00500 g of sodium chloride in 850 mL of solution
Thursday, April 26, 2012 at 9:40pm

science..chemistry
given the solubility product;Ksp,of calcium hydroxide is 0.0000064M,caculate its solubility at this temperature in i.water ii.0.1M calciumchloride solution
Thursday, April 26, 2012 at 7:06pm

Chemistry
Imagine that you have a 5.00 L gas tank and a 4.00 L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 105 atm, to what pressure should you fill ...
Thursday, April 26, 2012 at 6:36pm

Chemistry
2CO(g) + O2(g) 2CO2(g) Go = -511.6 kJ and So = -173.1 J/K at 314 K and 1 atm. The maximum amount of work that could be done by this reaction when 2.43 moles of CO(g) react at standard conditions at this temperature is__________ kJ. how?!
Thursday, April 26, 2012 at 6:31pm

chemistry
What does a catalyst do to the rate of reaction? What would you expect to happen to the rate of decomposition of dinitrogen pentoxide if a catalyst were added to the system?
Thursday, April 26, 2012 at 5:15pm

chemistry
The rate constant for this reaction was found to be 0.00550 s-1. What is the instantaneous rate of reaction when the concentration of dinitrogen pentoxide is 0.100 M? Rate = k[N2O5].
Thursday, April 26, 2012 at 5:15pm

chemistry
What is the rate of disappearance of dinitrogen pentoxide between 100 s and 200 s? Is this rate higher or lower than the rate from 0 s to 100 s that you calculated in part c? As the reaction takes place, what happens to [N2O5]? In general, does a higher concentration of ...
Thursday, April 26, 2012 at 5:14pm

chemistry
What is the rate of disappearance of dinitrogen pentoxide between 0 s and 100 s? Use the chart above to determine the change in concentration of N2O5between 0 s and 100 s.
Thursday, April 26, 2012 at 5:14pm

chemistry
If the rate of disappearance of dinitrogen pentoxide is 0.0300 M/s, what is the rate of appearance of nitrogen dioxide? Use your equations from part a
Thursday, April 26, 2012 at 5:13pm

chemistry
Write the rate equation for the relative disappearance of dinitrogen pentoxide. Write the rate equations for the relative appearance of nitrogen dioxide and oxygen gas. When writing the equations, remember to think about how many NO2 and O2 molecules are formed from 2 N2O5.
Thursday, April 26, 2012 at 5:12pm

Chemistry - Equilibrium Constant
Determine the value of the equilibrium constant (Kp) at 800. K and 1 atm pressure. SbCl3(g) + Cl2(g) -> SbCl5(g) Delta G(o)f (SbCl5) = -334.34 kJ/mol Delta G(o)f (SbCl3) = -301.25 kJ/mol Delta H(o)f (SbCl5) = -394.34 kJ/mol Delta H(o)f (SbCl3) = -313.80 kJ/mol I got a K ...
Thursday, April 26, 2012 at 4:31pm

Chemistry(Please check)
What is the molar solubility of barium phosphate in a 0.282M barium acetate solution? If I set up and ice table I would have 0.282M - X = ? Would I use the molar mass of barium acetate to complete the equation to find X?
Thursday, April 26, 2012 at 4:28pm

Chemistry
5. Explain the difference between a galvanic (voltaic) cell and an electrolytic cell. For a reaction in a galvanic cell, change in S is negative. Which of the following statements is true? Defend your answer. a."E"willncrease with an increase in temperature. b."...
Thursday, April 26, 2012 at 4:23pm

Chemistry - Cell Potential
Determine the delta G(o) and the equilibrium constant for the following reaction at 323 K. 2Br- + I2 --> Br2 + 2I- I got 100 kj/mol and K 7.19x10^16 but not sure if this is right
Thursday, April 26, 2012 at 3:58pm

Chemistry - Cell Potential
If the cell emf of a Zn-Cu cell is 0.80 V when the concentration of Zn2+ is 2.0M, what is the concentration of Cu2+?
Thursday, April 26, 2012 at 3:45pm

Chemistry
The Kp for the following equilibrium system is 4.31 x 10‒4 at 375°C : N2(g) + 3H2(g) ↔ 2NH3(g). If 0.862 atm of N2 and 0.373 atm of H2 were mixed in a constant-volume flask and heated to 375°C, which of the following would be closest to the equilibrium ...
Thursday, April 26, 2012 at 3:44pm

Chemistry - Cell Potential
If the cell emf of a Zn-Cu cell is 0.80 V when the concentration of Zn2+ is 2.0M, what is the concentration of Cu2+?
Thursday, April 26, 2012 at 3:18pm

chemistry
What makes #Ag2S+2Al(s)=Al2S3+6Ag(s) ?
Thursday, April 26, 2012 at 1:24pm

Chemistry
Which group of elements is most likely to not form ions?
Thursday, April 26, 2012 at 1:12pm

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