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November 24, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
Calculate the word done in joules when 1.0 mile of water vaporizes at 1.0 atm and 100 degrees Celsius. Assume that the volume of liquid water is negligible compared with that of steam at 100 degrees celcius, and ideal gas behavior.
Thursday, October 23, 2014 at 9:33pm

Chemistry
Suppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance ΔH∘f (kJ/mol) C(g) 718.4 CF4(g) −679....
Thursday, October 23, 2014 at 9:30pm

Chemistry
It requires 120 J of heat to raise the temperature of 70.0 g of rhodium from 280.0 K to 287.8 K. What is the molar heat capacity of rhodium?
Thursday, October 23, 2014 at 9:22pm

Chemistry
Constant-volume calorimeters are sometimes calibrated by running a combustion reaction of known ΔE and measuring the change in temperature. For example, the combustion energy of glucose is 15.57 kJ/g. When a 2.500 g sample of glucose burns in a constant volume calorimeter...
Thursday, October 23, 2014 at 9:21pm

Chemistry
A home swimming pool contains 145 m3 of water. At the beginning of the swimming season, the water must be heated from 20 to 32°C. How many joules of heat energy must be supplied?
Thursday, October 23, 2014 at 9:21pm

Chemistry
A piece of aluminum with mass of 5.0 g is immersed in 30.0 g of water. This system is heated electrically from 20.8 to 42.6°C. How many joules of energy are absorbed by the aluminum? (Cpaluminum = 24.4 J/mol-K; 1 mole of aluminum has a mass of 27.0 g)
Thursday, October 23, 2014 at 9:20pm

Chemistry (urgent)
Hydrolysis of a compound A, C7H6cl2 was carried out by refluxing with excess potassium hydroxide solution. the resulting solution was acidified with dilute HNO3 acid and excess silver nitrate was added to precipitate the chloride ions as silver chloride. 0.718g of silver ...
Thursday, October 23, 2014 at 8:48pm

Chemistry
Please help Suppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance ΔH∘f (kJ/mol) C(g) 718.4 CF4(g...
Thursday, October 23, 2014 at 5:57pm

Chemistry
Solid urea, (NH2)2CO, burns to give CO2,N2, and liquid H2O. Its heat of combustion is -632.2 kJ/mol. Balance the equation for combustion of urea, and calculate the heat generated per mole of H2O formed. (Enter in kJ.)
Thursday, October 23, 2014 at 5:47pm

Chemistry
A volume of 100.mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If the final temperature of the system is 21.50 ∘C , what is the mass of the steel bar? Use the following values: specific heat of ...
Thursday, October 23, 2014 at 4:24pm

Chemistry
A 0.84 g sample of caffeine, C8H10N4O2, burns in a constant-volume calorimeter that has a heat capacity of 7.85 kJ/K. The temperature increases from 298.30 K to 303.35 K. What is the molar heat of combustion of caffeine (in kJ).
Thursday, October 23, 2014 at 4:23pm

Chemistry
A coin dealer, offered a rare silver coin, suspected that it might be a counterfeit nickel copy. The dealer heated the coin, which weighed 14.0 g to 100°C in boiling water and then dropped the hot coin into 27.5 g of water at T = 17.0°C in an insulated coffee-cup, and ...
Thursday, October 23, 2014 at 4:18pm

Chemistry
A home swimming pool contains 145 m3 of water. At the beginning of the swimming season, the water must be heated from 20 to 32°C. How many joules of heat energy must be supplied?
Thursday, October 23, 2014 at 4:07pm

Chemistry
An electrical heater is used to add 20.50 kJ of heat to a constant-volume calorimeter. The temperature of the calorimeter increases by 5.42°C. When 1.25 g of methanol (CH3OH) is burned in the same calorimeter, the temperature increases by 7.49°C. Calculate the molar ...
Thursday, October 23, 2014 at 3:16pm

Chemistry
Suppose 100.0 mL of 1.00 M HCl and 100.0 mL of 1.00 M NaOH, both initially at 23.0°C, are mixed in a thermos flask. When the reaction is complete, the temperature is 29.8°C. Assuming that the solutions have the same heat capacity as pure water, compute the heat ...
Thursday, October 23, 2014 at 3:13pm

Chemistry
The Ksp for BaCrO4 is 1.2X10-10. Will BaCrO4 precipitate when 10 mL of 1 X10-5M Ba(NO3)2 is mixed with 10 mL of 1X10-3M K2CrO4? I am not sure where to start
Thursday, October 23, 2014 at 11:04am

Chemistry
88-L sample of dry air cools from 197 degree celsius to -48 degrees celsius while the pressure is maintained at 2.93 atm. what is the final volume?
Thursday, October 23, 2014 at 10:25am

CHEMISTRY
How many moles of magnesium are needed to react with 16 g of O2? 2 MgO (s) + O2 (g) → 2 MgO (s)
Thursday, October 23, 2014 at 1:11am

Chemistry
When 5.4 g of NaCl and 3.6 g of AgNO3 are dissolved in water and mixed, what ions remain in the solution and how many moles of each will be there?
Thursday, October 23, 2014 at 12:39am

Chemistry
26.5 kJ of heat is added to 5.44 g of ice at 0 C. What phase(s) are present and what is the temperature of the system after all the heat is absorbed?
Thursday, October 23, 2014 at 12:39am

Chemistry
You are given 21.0 mL of a 5.00% solution of NaOH. The solution has a density of 1.02 g/mL. What volume of 0.0895M H2SO4 will you need to completely and exactly react (neutralize) the NaOH?
Wednesday, October 22, 2014 at 11:26pm

Chemistry
Find the change in internal energy for this reaction. Enter in kJ. 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l) Enthalpy of reaction= -2599 kJ
Wednesday, October 22, 2014 at 10:25pm

Chemistry
a solution of arsenic oxide containing 0.24g required 50cm^3 of acidified potassium manganate of solution of concentration 0.02M for complete oxidation. What is the oxidation state of arsenic in the product?
Wednesday, October 22, 2014 at 10:14pm

Chemistry
a compound of nitrogen and oxygen is 30.46% by mass N and 69.54% by mass O. the molar mass if the compound was determined to be 92g/mol. What is the empirical formula of the compound? What is the molecular formula of the compound?
Wednesday, October 22, 2014 at 10:09pm

Chemistry
When 6.25grams of pure iron are allowed to react with oxygen, a black oxide forms. If the products weighs 8.15g, what is empirical formula of the oxide?
Wednesday, October 22, 2014 at 10:04pm

Chemistry (urgent)
Calculate the volume of an acidified solution of 0.02M potassium manganate that would be used to oxidize 100cm^3 of magnesium etanedioate.
Wednesday, October 22, 2014 at 9:37pm

Chemistry
Plot the titration of a weak base with a strong acid. Show the titration curve using .106M NH3 and .225M HCl for a 50.00mL sample of the ammonia. No idea where to start here. I'm supposed to plot the curve from 2mL increments (0-30). Tip on homework: *Remember to use the ...
Wednesday, October 22, 2014 at 8:34pm

Chemistry
what is the limiting reagent in these two reactions Reaction 1: CuSO4+2NaOH=Cuo+Na2SO4+H2O Reaction 2: CuSO4+NaCO3=CuCO3+Na2SO4
Wednesday, October 22, 2014 at 7:51pm

Chemistry
Indicate whether Fe3+ ions are reduced by silver under standard conditions.
Wednesday, October 22, 2014 at 6:52pm

PSYCH/SOCIOLOGY!!!
Should I take psychology before sociology or take sociology before psychology. Like saying "You can't do well in chemistry unless you finish biology"
Wednesday, October 22, 2014 at 6:34pm

Chemistry 111
Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 17. g of ethane is mixed with 107. g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction. Be sure your answer has the ...
Wednesday, October 22, 2014 at 5:46pm

Chemistry
How much work must be done on a system to decrease its volume from 14.0 L to 5.0 L by exerting a constant pressure of 4.0 atm?
Wednesday, October 22, 2014 at 5:13pm

chemistry
Calculate ∆T for the reaction. Assume the initial temperature of both reactants is 25.0◦C. Calculate the volume of the reaction mixture. Calculate the mass of the reaction mixture. Assume the density of the mixture is 1.03 g mL^(-1). Calculate the heat transferred ...
Wednesday, October 22, 2014 at 4:31pm

Chemistry
What is the pressure (in mmHg) of the gas inside the apparatus below if the atmospheric pressure is Patm=748 mmHg, h1=40 mmHg, and h2=67 mmHg?
Wednesday, October 22, 2014 at 4:05pm

Chemistry
1. Sodium can be extracted by heating naturally occurring salt until it is molten. An electrochemical process is then used to extract the sodium. Cl2 is produced at the anode, and Na is collected at the cathode. A standard reduction potential graph for the reaction is shown ...
Wednesday, October 22, 2014 at 3:12pm

Chemistry
3. An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is: Zn(s) → Zn2+(aq) + 2e− The cell potential for the reaction is Eºcell = 1.83 V. a. Is the reaction spontaneous or nonspontaneous? Explain. (1 ...
Wednesday, October 22, 2014 at 3:09pm

Chemistry
2. Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq) + 3e− Zn2+(aq) + 2e− → Zn(s) a. Predict the potential of the cell under standard conditions. (4 points) b. Predict whether the ...
Wednesday, October 22, 2014 at 3:08pm

Easy chemistry
Which statement correctly identifies how a lead-storage battery in a car works? A. The battery acts as a galvanic cell as it provides current to the radio. B. The battery acts as a galvanic cell as it is recharged by the alternator. C. The battery acts as an electrolytic cell ...
Wednesday, October 22, 2014 at 1:27pm

Chemistry
Which statement correctly identifies how a lead-storage battery in a car works? A. The battery acts as a galvanic cell as it provides current to the radio. B. The battery acts as a galvanic cell as it is recharged by the alternator. C. The battery acts as an electrolytic cell ...
Wednesday, October 22, 2014 at 12:56pm

Chemistry
In a titration for the determination of the chloride ion, a solution of 0.1M agno3 is used against a solution, the volume of which is 100ml. At the completion of the titration, the residual concentrations of silver and chloride ions are equal and the total volume is now 125ml...
Wednesday, October 22, 2014 at 7:04am

Chemistry
In a titration for the determination of the chloride ion, a solution of 0.1M agno3 is used against a solution, the volume of which is 100ml. At the completion of the titration, the residual concentrations of silver and chloride ions are equal and the total volume is now 125ml...
Wednesday, October 22, 2014 at 7:03am

Chemistry
Energy in the amount of 420J is added to a 35g sample of water at a temperature of 10.0 C . What is the final temperature of water ?
Wednesday, October 22, 2014 at 6:48am

chemistry
The percentage of C,H,O in vitamin C were determined by burning a sample weighing 2.00g. The masses of carbon dioxide and water formed are 3.00mg and 0.81mg respectively. Find the percentage of each element and the empirical fomula of vitamin C
Wednesday, October 22, 2014 at 2:51am

chemistry
How many moles of magnesium are needed to react with 16 g of O2? 2 MgO (s) + O2 (g) → 2 MgO (s)
Wednesday, October 22, 2014 at 1:14am

Chemistry
Calculate the molarity of 25.00ml H2SO4 solution if 32.48ml of 0.1068M NaOH is required to titrate? Balanced equation is H2SO4(aq)+2NaOH(aq)=Na2SO4(aq)+2 H2O (l)
Wednesday, October 22, 2014 at 12:36am

chemistry
what amount of heat is needed to increase the temperature of 95.3g of copper from 25 degrees Celsius to 48 degrees Celsius? The value of Cp for copper is 0.387 degrees Celsius.
Wednesday, October 22, 2014 at 12:04am

chemistry
What amount of Heat is needed to increase the temperature of 95.3 g of copper from 25.0 degrees celsius to 48 degrees celsius? The value of Cp for copper is 0.387 degrees celsius
Tuesday, October 21, 2014 at 11:21pm

Chemistry
A 35.0-L cylinder contains 387 g O2(g) at 22.5°C. What mass of O2(g) must be released to reduce the pressure in the cylinder to 5.94 atm, assuming the temperature remains constant?
Tuesday, October 21, 2014 at 10:24pm

Chemistry
What is energy difference between staggered and eclipsed conformations of 2,2,3,3-tetramethylbutane? Is it 2k/J/mol? Interaction Energy Cost (kJ/mol) H/H Eclipsed 4 CH3/H Eclipsed 6 CH3/CH3 Eclipsed 11 CH3/CH3 Gauche 3.8
Tuesday, October 21, 2014 at 10:08pm

Chemistry
What is the percentage of the S enantiomer in a sample of carvone that has a specific rotation of 30, given that the specific rotation of (R)-carvone is -61? How do i set up the problem?
Tuesday, October 21, 2014 at 10:04pm

Chemistry
What is the pressure (in mmHg) of the gas inside the apparatus below if the atmospheric pressure is Patm=748 mmHg, h1=40 mmHg, and h2=67 mmHg?
Tuesday, October 21, 2014 at 10:02pm

Chemistry
The structure of Crestor (rosuvastatin), a medication used to reduce cholesterol, is shown below. If the specific rotation for this compound is known to be +100, what would be the specific rotation for the stereoisomer shown at the right?
Tuesday, October 21, 2014 at 9:57pm

Chemistry
How would you prepare 165 mL of a 0.976 M NaOH solution, starting with a 6.36 M stock solution? Volume of solution needed? Volume of water needed?
Tuesday, October 21, 2014 at 9:50pm

Chemistry
An electrical heater is used to supply 200.0 J of energy to a 30.0 g sample of water, originally at 285.0 K. Determine the final temperature in degrees Kelvin. (the specific heat capacity for water is 75.291 Jmol-1K-1)
Tuesday, October 21, 2014 at 9:41pm

Chemistry
1. The temperature of two substances with the same mass increases by 20 degrees Celsius. Which absorbs the most energy, the substance with the higher or lower specific heat? Explain 2. The human body is approximately 60% water. Explain how this high percentage of water helps ...
Tuesday, October 21, 2014 at 9:20pm

Chemistry
When 4.62 mL of cold water at 22.6 °C is mixed with 37.5 mL of hot water at 67.9 °C in a thermally isolated calorimeter, what is the final temperature of the mixture when thermal equilibrium has been achieved? H2O density = 1.00 g/mL.
Tuesday, October 21, 2014 at 9:03pm

Chemistry
3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) standard enthalpy: -133.5 Find the change in internal energy for this reaction. Enter in kJ.
Tuesday, October 21, 2014 at 8:49pm

Chemistry
What mass of phosphoric acid will be produced from the reaction of 10.00g of P4O10 with 12g water?
Tuesday, October 21, 2014 at 8:25pm

Chemistry
1. The temperature of two substances with the same mass increases by 20 degrees Celsius. Which absorbs the most energy, the substance with the higher or lower specific heat? Explain 2. The human body is approximately 60% water. Explain how this high percentage of water helps ...
Tuesday, October 21, 2014 at 8:24pm

Chemistry
Use standard enthalpies of formation to determine ΔHorxn for: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l) Enter in kJ.
Tuesday, October 21, 2014 at 7:24pm

Chemistry
2. A fluoride electrode is used to determine fluoride in a water sample. Standards and samples are diluted 1:10 with TISAB solution. For a 1.00 x10-3M(before dilution) standard, the potential reading relative to the reference electrode is -211.3mV and for a 4.00 x10-3M ...
Tuesday, October 21, 2014 at 6:32pm

Chemistry
What voltage would be measured in a 1.00 x10-3M acetic acid solution (pH=3.88)? Assume aH+= [H+].
Tuesday, October 21, 2014 at 6:28pm

Chemistry
The combustion of liquid ethanol (C2H5OH) produces carbon dioxide and water. After 4.60mL of ethanol (density=0.789g/ml) was allowed to burn in the presence of 15.45g of oxygen gas, 3.70mL of water (density=1.00g/ml) was collected. a)Determine the theoretical yield of H2O for ...
Tuesday, October 21, 2014 at 6:18pm

Chemistry
Mass of an empty flask and stopper is 55.844g. 5mL of an unknown liquid is added and heated in a water bath at 99.7 degrees C. It then cools down. The stopper is removed and then replaced. The weight of all of this is 56.101g. The volume of the flask is 248.1 mL. Barometric ...
Tuesday, October 21, 2014 at 4:20pm

Chemistry
A buffer solution of volume 100.0 mL is 0.140 M Na2HPO4(aq) and 0.120 M KH2PO4(aq). What are the pH and the pH change resulting from the addition of 55.7 mL of 0.0100 M NaOH(aq) to the buffer solution?
Tuesday, October 21, 2014 at 3:56pm

Chemistry
What volume of 0.170 M K3PO4(aq) must be added to 50.3 mL of 0.103 M K2HPO4(aq) to prepare a buffer solution with a pH of 12.09?
Tuesday, October 21, 2014 at 1:00pm

Chemistry
Consider a solution of CaCl2 and Mg(NO3)2 in which the concentrations of both Mg2+ and Ca2+ are the same, 0.01. M. Is it possible to separate Ca2+ from Mg2+ by selective precipitation of Mg(OH)2? To be precise, is it possible to precipitate 99.99% of magnesium without ...
Tuesday, October 21, 2014 at 5:40am

Chemistry
Chemical reaction for converting polythene to ethanol
Tuesday, October 21, 2014 at 4:46am

chemistry
how many moles of oxygen gas are required to react with 4.0 moles of Mg? 2 Mg (s) + O2(g) → 2 MgO (s)
Tuesday, October 21, 2014 at 2:35am

chemistry
How many moles of magnesium are needed to react with 16 g of O2? 2 MgO (s) + O2 (g) → 2 MgO (s)
Tuesday, October 21, 2014 at 1:45am

Chemistry
Predict and draw the structure of the product of the reaction of the following substrates with the given reducing agent. 2-hexanone mixed with hexanoic acid with (i) NaBH4 (ii) LiAlH4
Tuesday, October 21, 2014 at 12:34am

chemistry
Find the volume of 20.0g of benzene
Tuesday, October 21, 2014 at 12:18am

Chemistry
H2C2O4(aq) + 2 NaOH(aq) → Na2C2O4(aq) + 2 H2O(l) If I use 0.025 moles of NaOH to neutralize the Oxalic acid, how many moles of Oxalic acid are there?
Tuesday, October 21, 2014 at 12:09am

chemistry
A flask that can withstand an internal pressure of 2511 torr, but no more, is filled with a gas at 21.0°C and 758 torr and heated. At what temperature will it burst? i used P1/x=P2/T2 and got 69.6 degrees Celsius. what is wrong
Monday, October 20, 2014 at 10:57pm

Chemistry
How long (in minutes) must a 5.40 A current be passed through an aqueous solution of zinc nitrate to deposit 87.5 g Zn?
Monday, October 20, 2014 at 10:43pm

Easy Chemistry
How long (in minutes) must a 5.40 A current be passed through an aqueous solution of zinc nitrate to deposit 87.5 g Zn?
Monday, October 20, 2014 at 10:24pm

chemistry
H2(g) + Cl2(g) HCl(g) Consider the unbalanced equation above. 3.95 L of H2 and 1.00 L of Cl2 are reacted under the same conditions of temperature and pressure. (a) How many liters of HCl will be produced? (b) How many liters of reactant are in excess? i found part a to be 2.00...
Monday, October 20, 2014 at 10:15pm

chemistry
Which of the following half-reactions would occur at the anode of an electrochemical cell? A. H+(aq) + Cl− (aq) → HCl(aq) B. Li+(aq) + e− → Li(s) C. Cu+(aq) + e− → Cu(s) D. Cu(s) → Cu+(aq) + e−
Monday, October 20, 2014 at 9:39pm

Bio- Chemistry
How can you identify the difference between an plant and animal cell. What structures (you should have at least 2) should you look for in each in order to tell the difference?
Monday, October 20, 2014 at 8:54pm

Chemistry
When 2.25 g of sodium hydroxide (NaOH) was dissolved in 150.00 g of water a value of 11.00oC was obtained for ΔT. 1. Calculate the molarity of the sodium hydroxide solution. 2. Calculate the value (calories) for the heat of solution of 2.25 g of NaOH. 3. Calculate the ...
Monday, October 20, 2014 at 8:48pm

Chemistry
Match the following units to their correct property: A. Density of Solution B. Heat Capacity C. Molarity D. Specific Heat 1. J/g•oC 2. J/oC 3. g/ml 4. cal/g•oC
Monday, October 20, 2014 at 8:47pm

chemistry
Describe the difference between a prokaryote and a eukaryote. Be specific about the description of each type of cell (i.e. tell which cell type has which characteristics.)
Monday, October 20, 2014 at 8:39pm

chemistry
Why are half-reactions used in redox reactions? A. They make it easier to keep track of spectator ions in the reaction. B. They make it easier to see the oxidation and reduction parts of the reaction separately. C. They make it possible to neglect the electrons that are being ...
Monday, October 20, 2014 at 7:23pm

chemistry
What is the difference between a galvanic cell and an electrolytic cell? A. A galvanic cell converts reduction reactions into an electrolytic cell, and an electrolytic cell converts oxidation reactions into a galvanic cell. B. A galvanic cell converts oxidation reactions into ...
Monday, October 20, 2014 at 6:28pm

Chemistry
An aqueous solution of ammonium nitrite decomposes when heated to give off nitogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was colleced over water at 25˚C ...
Monday, October 20, 2014 at 5:39pm

science-chemistry
An aqueous solution of ammonium nitrite decomposes when heated to give off nitogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was colleced over water at 25˚C ...
Monday, October 20, 2014 at 5:38pm

Chemistry
An aqueous solution of ammonium nitrite decomposes when heated to give off nitrogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was collected over water at 25˚C ...
Monday, October 20, 2014 at 5:36pm

chemistry
The heat of solution of ammonium nitrate is 26.2 kJ/mol, and a 7.315 g sample of NH4NO3 is added to 40.0 mL of water in a constant pressure calorimeter initially at 25.2°C, what is the final temperature reached by the solution? (The specific heat of water = 4.184 J/g•...
Monday, October 20, 2014 at 5:26pm

Chemistry
How would the empirical formula of copper (II) sulfate be affected if some of the sample sticks to the stirring rod?
Monday, October 20, 2014 at 5:22pm

Chemistry
Po-210 Ia an alpha emitter with a half-life of 138 days. how many grams of Po-210 remain after 552 days if the sample initially contained 5.80g of Po-210?
Monday, October 20, 2014 at 4:27pm

chemistry
How many aluminum atoms are in 3.78 g\rm g of aluminum?
Monday, October 20, 2014 at 4:19pm

Chemistry
The following galvanic cell at standard conditions has a potential of 0.03 V: Ag+(aq) + Fe2+(aq) → Fe3+(aq) + Ag(s). What would be the effect of increasing the concentration of Ag+? A. The cell potential will decrease. B. The cell potential will increase. C. The cell ...
Monday, October 20, 2014 at 4:03pm

Chemistry
What mass KCl is needed to precipitate AgCl from 15.0 mL of .200 M AgNO3
Monday, October 20, 2014 at 3:58pm

Chemistry
The following galvanic cell at standard conditions has a potential of 0.03 V: Ag+(aq) + Fe2+(aq) → Fe3+(aq) + Ag(s). What would be the effect of increasing the concentration of Ag+? A. The cell potential will decrease. B. The cell potential will increase. C. The cell ...
Monday, October 20, 2014 at 2:56pm

Easy Chemistry
What is the oxidation half-reaction for Mg(s) + ZnCl2(aq) MgCl2(aq) + Zn(s)? A. Zn(s) Zn2+ + 2e- B. Zn2+ + 2e- Zn(s) C. Mg(s) Mg2+ + 2e- D. Mg2+ + 2e- Mg(s)
Monday, October 20, 2014 at 2:26pm

Easy Chemistry
Which of the following processes uses a galvanic cell? A. Electroplating silver metal onto a teapot B. Purification of metals such as copper from their metal ores C. Electrolysis of sodium chloride D. Operation of a portable music player
Monday, October 20, 2014 at 1:54pm

Chemistry
the human body is 60% water by weight, how much water in liters does a 196lb man contain?
Monday, October 20, 2014 at 1:29pm

chemistry
Can someone help me with Chemistry Homework Due Tomorrow, Its about the Electrolysis of Hydrochloric Acid Practical we did and I Have to write a summary and I dont get what we did Y10 GCSE Higher Tier
Monday, October 20, 2014 at 1:14pm

chemistry
When 25.0 ml of 0.500M HCI is added to 25.0ml of 0.500M KOH in a coffee cup calorimeter at 23.50C, the temperature rises to 30.17C. Calculate delta H of this reaction ( assume density of solution = 1g/ml)
Monday, October 20, 2014 at 12:46pm

chemistry
one piece of copper metal at 105 C has twice the mass of another copper piece at 45 C. What is the final temperature if these two pieces are placed in a calorimeter. Specific heat of copper is 0.387 J/g.K.
Monday, October 20, 2014 at 11:34am

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