Friday
February 27, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Post a New Question | Current Questions

Chemistry re-post
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...
Monday, January 19, 2015 at 5:29pm

Chemistry
If equal volumes of the following are combined, would they form buffered solutions? Why or why not? 1) .1M NaC2H3O2 and .1M HF 2) .1M HF and .05M NaF I'm am a bit confused about how I can figure out if these will form buffers or not, so I'd really appreciate it if ...
Monday, January 19, 2015 at 5:20pm

chemistry
14/6 c has a half-life of 5600 years. An anyalsis of charcoal from a wood fire shows that 14c content is 25 per cent of living wood. how many years have passed since fire for the wood was cut
Monday, January 19, 2015 at 3:26pm

chemistry
When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 4.8 M is required to react completely with 2.60 g of magnesium?
Monday, January 19, 2015 at 12:53pm

chemistry grade 11
which of the following has lowest vapour pressure ? 1 water 2 bromine 3 ethyl alcohol 4 ether
Monday, January 19, 2015 at 7:15am

Chemistry
In water at 25°C, which of the following is the most basic solution? a) pH = 3 b) pH = 0 c) [OH-] = 10-13 M d) [H3O+] = 10-13 M My assumption is is OH- 10^-13, but I am not confident, is this some sort of trick question?
Monday, January 19, 2015 at 5:20am

Science, Chemistry
2) Find the temperature at which air posses a density equal to that of hydrogen at 0°C. Density of air at STP is 14.4. Ans: 3658.2 °C.
Monday, January 19, 2015 at 5:17am

Chemistry
Perchloric acid, HClO4, is a strong acid. What are the pH values of the following solutions: a) 3 M perchloric acid b) 0.1 M perchloric acid c) 0.001234 M perchloric acid d) 10-5 M perchloric acid e) 10-9 M perchloric acid is the pH -log(conc. ?
Monday, January 19, 2015 at 5:17am

Chemistry (Error Propagation)
Calculate, with uncertainty, and express with a reasonable number of significant figures. a) 5.4 (±0.2) – 3.7 (±0.4) = b) 6.84 (±0.04) × 0.7 (±0.04) =
Monday, January 19, 2015 at 5:15am

Chemistry (Electrochemistry)
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M Ti3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...
Monday, January 19, 2015 at 5:13am

chemistry
20 mL of propene is reacted with 70 ml of hydrogen at STP to produce propane, according to the equation. Calculate the volume of H2 gas consumed
Sunday, January 18, 2015 at 11:26pm

Chemistry
Use molar gas volumes to convert the following gas volumes to amount in moles. A) 1.5 L of carbon monoxide gas at SATP B) 21.5 L of fluorine gas at STP
Sunday, January 18, 2015 at 8:30pm

Chemistry
A sealed container comtains 1.50 mol of nitrogen gas, 2.00 mol of oxygen gas and 3.50 mol of argon gas. If the total pressure is 900 kPa, what is the pressure of the nitrogen gas?
Sunday, January 18, 2015 at 8:28pm

chemistry
A 6.00 L balloon contains helium at SATP at ground level. What is the volume when it floats up to an altitude where the temperature is 10.0 degrees C and atmospheric pressure is 91.5 kPa
Sunday, January 18, 2015 at 8:26pm

Chemistry
Iron 3 hydroxide reacts with acetic acid to form iron 3 acetate and water. If 45.4g of water are formed,what mass of iron 3 acetate will be produced? •Fe(OH)3+3HC2H3O2--->Fe(C2H3O2)+​3H2O 45.4H2O( ? Fe(C2H3O)) ----------------------------------------​ ( ? H2O)
Sunday, January 18, 2015 at 7:07pm

Chemistry
Why is the carbonate solution boiled before titrating?
Sunday, January 18, 2015 at 3:50pm

chemistry
Under SATP, magnesium was reacted with acid and 500 ml of hydrogen gas was collected over water. A) what is the vapor pressure of water? B) What is the pressure of the hydrogen gas? C) What amount of hydrogen was produced? I only know how to do the law of partial pressures and...
Sunday, January 18, 2015 at 3:46pm

Chemistry
What will the pH be if 15 mL of 0.1 M HCl are added to the buffer obtained by mixing 70 mL of 0.5 M CH3NH2 and 30 mL of 1.0 M CH3NH3+Cl-? (Kb for CH3NH2 is: 5.2 x 10-4 ) I'm having a hard time figuring out what to do first. is the ICE table come in handy for this? Can you ...
Sunday, January 18, 2015 at 2:47pm

chemistry
Lol
Sunday, January 18, 2015 at 12:49pm

chemistry
The combustion of a compound which contains only C and H yields 2.58 g of CO2 and 0.53 g of H2O. What is the empirical formula of the compound?
Sunday, January 18, 2015 at 11:51am

chemistry
calculate the volume of oxygen at 15 degree Celsius and 745mmHg pressure. which could be obtained by heating 10g of potassium trioxochlorate(v)
Sunday, January 18, 2015 at 8:41am

Chemistry
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M Ti3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...
Sunday, January 18, 2015 at 2:37am

chemistry
Use this article to answer questions about mass spectrometry and how it was used to identify lead isotopes in the air around Mexico City. Determination of Particulate Lead Using Aerosol Mass Spectrometry: MILAGRO/MCMA-2006 Observations (Ok I read the article and I just can'...
Sunday, January 18, 2015 at 12:00am

Chemistry
1. Why can’t gravimetric analysis be used to determine the concentration of sodium nitrate (NaNO) in a solution? 2. Why is it important in gravimetric analysis to add an excess amount of precipitating ions to a solution containing an analyte? 3. Relate gravimetric ...
Saturday, January 17, 2015 at 11:52pm

Chemistry (Re-post)
The distribution co-efficient of butanoic acid (pKa = 4.8) between water and two organic solvents are given below; Benzene D= 3.0 Octanol D= 6.2 a) which organic solvent is expected to extract the acid most efficiently from the water? explain your answer. So you expect that ...
Saturday, January 17, 2015 at 11:47pm

chemistry
A. What is the standard potential, in volts, of a galvanic cell made of Ce4+ and Cu2+, given the standard reduction potentials below? Ce4+ + e− → Ce3+ Eº = 1.61 V Cu2+ + 2e− → Cu(s) Eº = 0.34 V I think it is 1.27 V but it might be 1.95V b. How...
Saturday, January 17, 2015 at 11:32pm

chemistry
Identify the Oxidation and reduction half reaction in 2 KMNO4 + 10 FeSO4 + 8 H2SO4 -> K2SO4 + 2 MNSO4 + 5 Fe2(SO4)3 + 8 H2O Write net ionic equation
Saturday, January 17, 2015 at 11:18pm

Chemistry
For a particular reaction, ΔH = -328.21 kJ and ΔS = 98.7 J/K. Calculate ΔG for this reaction at 298 K.
Saturday, January 17, 2015 at 9:39pm

Chemistry
Can someone please tell me what to expect from Beginner High School chemistry? Is it mostly applying mathematics like physics? Or basically memorizing like biology? Thank you!
Saturday, January 17, 2015 at 9:12pm

Chemistry
Problem: Calculate the pH titration of 50 mL of 0.02M H3PO4 from pH 1 to 13 with 0.4M NaOH. So I believe the balanced reaction is: H3PO4 + OH --> H2PO4 + H2O (Since Na I believe is insignificant, maybe that's wrong. If so then, H3PO4 + NaOH --> NaH2PO4 + H2O) ICE ...
Saturday, January 17, 2015 at 8:40pm

Chemistry
How to Prepare a 50 mM pH 6 Citrate buffer starting from citric acid as the sole source of conjugate base.
Saturday, January 17, 2015 at 5:21pm

Chemistry
How to perform a pH Titration of 25 ml of 50 mM Phosphoric acid from pH 1 to pH 13 with 1 N NaOH (including standardizing the NaOH).
Saturday, January 17, 2015 at 5:20pm

Chemistry
How do I find x and y in the following equation: 222. 4 86 Rn - 2 He + X 228. 0 -1 e. + y 88ra
Saturday, January 17, 2015 at 3:43pm

chemistry
I need to understand the following question 14/6 C has a half-life of 5600years. an analysis of charcoal from a wood fire shows that its 14c content is 25 per cent higher that of living wood How many years have passed.
Saturday, January 17, 2015 at 3:21pm

AP CHEMISTRY
an unknown metal reacts with chlorine to produce 6.84 g of metal chloride. when metal chloride dissolves in 100 mL of solvent the metal ion concentration is 0.43 M. What is the unknown metal?
Saturday, January 17, 2015 at 12:26pm

Chemistry
How to Prepare a 50 mM pH 6 Citrate buffer starting from citric acid as the sole source of conjugate base.
Saturday, January 17, 2015 at 8:22am

Chemistry
How to perform a pH Titration of 25 ml of 50 mM Phosphoric acid from pH 1 to pH 13 with 1 N NaOH (including standardizing the NaOH).
Saturday, January 17, 2015 at 8:22am

Chemistry
The distribution co-efficient of butanoic acid (pKa = 4.8) between water and two organic solvents are given below; Benzene D= 3.0 Octanol D= 6.2 a) which organic solvent is expected to extract the acid most efficiently from the water? explain your answer. I understand that D ...
Saturday, January 17, 2015 at 4:01am

Chemistry
What will be the concentration of the solution obtained when 2500ml of water is added to a 37% v/v 1.19 g/ml (stock bottle)solution of hcl acid
Saturday, January 17, 2015 at 1:19am

Chemistry
How to make 100 mL of 100mM of Tris HCl and 100 mL of 100mM of Tris Base. Follow the pH of the resulting combined solution as it is heated from 0 to 50 degrees Celsius.
Friday, January 16, 2015 at 9:18pm

Chemistry
write 2-3 sentences describing and identifying the type of chemical reaction that occurs when Fe^2+ reacts with potassium permanganate and specifying the type of solution required for the reaction to occur I don't know what type of reaction this is or what other solution ...
Friday, January 16, 2015 at 5:05pm

chemistry
calculate the mass of sodium chloride produced when 5.50 moles of sodium reacts in excess chlorine gas.
Friday, January 16, 2015 at 4:19pm

chemistry
identify the type of reaction that occurs between potassium carbonate and nitric acid
Friday, January 16, 2015 at 2:35pm

chemistry
The level of water in an Olympic size swimming pool (50.0 meters long, 25.0 meters wide, and about 2 meters deep) needs to be lowered 3.2 cm. If the water is pumped out at a rate of 5.0 liters per second, how long will it take to lower the water level 3.2 cm?
Friday, January 16, 2015 at 12:42pm

Chemistry - PLEASE HELP!!!
A 5.0 g n2o (laughing gas) that is inside a 12 mL cylinder used used to fill up a 800 mL whipped cream container. Beforehand, the container had air in it at 760 torr atmosphere pressure at 25 degrees celsius. Then, we will add the n2o/air mix to balloon until the pressure in ...
Thursday, January 15, 2015 at 11:22pm

chemistry
How to prepare 0.2M of NaOH in 250ml volumetric flask???
Thursday, January 15, 2015 at 10:42pm

Science (Chemistry)
Identify the manipulated and responding variables in this testable question: "Does orange juice transform from a solid to a gas at the same exact rate as water?" My question is, what will you be changing in this lab (MV) and what are you measuring (RV)?
Thursday, January 15, 2015 at 10:03pm

Chemistry
Imagine that you have a 7.00L gas tank and a 4.00L 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 145atm , to what pressure should you fill the...
Thursday, January 15, 2015 at 8:40pm

CHEMISTRY
1.What is the relationship between polarity of a molecule and boiling point? 2.How does a hydrogen bond's strength compare to normal chemical bonds. such as covalent and ionic bonds? 3.Why don't fish freeze to death when the water above them freezes in a pond? 4.Why ...
Thursday, January 15, 2015 at 6:18pm

chemistry
calculate the mass of Pbl2 produced by reacting of 30.0g Kl with excess Pb( NO3)2
Thursday, January 15, 2015 at 3:34pm

Chemistry
Which substance would have the highest melting point, based on electronegativity? H2S H2O H2Se H2Te H20? Hydrogen bonds can be found between molecules of which of the following substances? HI CH4 H2 NH3 not sure
Thursday, January 15, 2015 at 7:43am

chemistry
10g of hydrogen is burnt in the presence of excess oxygen.the mass of water formed is?
Thursday, January 15, 2015 at 6:37am

Chemistry
If a 10K race is 10.0 kilometers (1.00 × 10^4 meters), what is the distance in yards? (Given: 1 meter = 1.09 yards)
Wednesday, January 14, 2015 at 9:55pm

Chemistry
How many grams of solid product should form if 4.90 grams of sodium phosphate is mixed with 25 ml of .875M barium nitrate?
Wednesday, January 14, 2015 at 8:58pm

Chemistry
#6 If 10.0 grams of Aluminum carbonate(s) decomposes to produce aluminum oxide(s) and carbon dioxide(g), how many grams of CO2(g) are formed? If 5.00 grams is recovered experimentally what is the percent yield?
Wednesday, January 14, 2015 at 8:45pm

Chemistry
a solution of HCL is approximately 0.1M and has to be standardized . 1.234g Na2CO3 are dissolved to make 100ml of solution. 20mL of this solution are titrated with the HCL solution, requiring 31.3mL for the second equivalence point. what is the exact concentration of the HCL ...
Wednesday, January 14, 2015 at 8:12pm

Chemistry
Draw the pH-titration curve for the following, label x and y axes accordingly. 10 mL of 0.1M H3PO4 with 0.1 M NaOH (Logk values = 2, 7, 12) I understand that the x-axis is mL of H3PO4 added and y-axis is the pH. But the logK values, is that the equiv-points for the tri-protic ...
Wednesday, January 14, 2015 at 8:05pm

chemistry
A 5.0 L sample of nitrogen gas has a pressure of 95 kpa. What is the final volume of the gas if the pressure is tripled? I know p1 = 95, v1=5.0 and p2 = tripled What i dont understand is what number is tripled, is it 95 times 3??
Wednesday, January 14, 2015 at 7:32pm

Chemistry
A gas occupies 30 0dm3 at stp what volume would it occupy at 91 and 380mm hg?
Wednesday, January 14, 2015 at 6:10pm

Chemistry
#5 Limiting Reactants How many grams of water will be produced in the complete combustion of 20.0 grams of Octane, C8H18(g) and 50.0 grams Oxygen gas?
Wednesday, January 14, 2015 at 1:06am

chemistry
A sample of oxygen at 24.0 degrees celcius and 99.3 kpa was found to have a volume of 455 ml. How many grams of O2 were in the sample?
Tuesday, January 13, 2015 at 8:25pm

Chemistry
The overall reaction in a commercial heat pack can be represented as shown below. 4 Fe(s) + 3 O2(g) 2 Fe2O3(s) ΔH = -1652 kJ How much heat is released when 4.00 mol iron is reacted with excess O2? How much heat is released when 1.00 mol Fe2O3 is produced? How much heat is...
Tuesday, January 13, 2015 at 7:28pm

Chemistry
Write the reduction half reaction for the redox reaction below. ClO-(aq) + I-(aq) => Cl-(aq) + I2(s) Is I- being reduced since Cl is losing an O?
Tuesday, January 13, 2015 at 6:27pm

Chemistry
A 10.00mL sample of 0.02141mol/L potassium iodate was treated with excess iodide ion and titrated with sodium thiosulfate. If 32.33 mL of a Na2S2O3 solution was requried to reach the colorless endpoint (after addition of starch indicator) , what molarity of the Na2S2O3 ...
Tuesday, January 13, 2015 at 5:10pm

chemistry
The percentage yield for the reaction PCL3+Cl2-->PCL5 is 83.2%. What mass of PCL5 is expected from the reaction of 73.7g of PCL3 with excess chlorine?
Tuesday, January 13, 2015 at 4:19pm

Chemistry
Write the balanced half reaction for the reduction and oxidation reactions for the redox reaction: 2 Mg (s) + O2 (g) -> 2 MgO (s) Notice: for this question you do not have to include a charge of zero and you do not have to include the states. Below is an example of the form...
Tuesday, January 13, 2015 at 9:36am

chemistry
I want to boil 25c, 50c, and 75c to 100c but I don't have a thermometer. I did 0c which was 1.42 but I can't do the others.
Tuesday, January 13, 2015 at 2:46am

Chemistry (Chromatography)
Comment on the order of elution of the following solutes in (a) normal phase and (b) reversed phase liquid chromatography. Give reasons why. Solute X - non-polar Solute Y- Polar, a dipole Solute Z - Polar, more polar than solute Y I understand that polarity is the reason of ...
Tuesday, January 13, 2015 at 2:15am

Chemistry (Chromatography)
In elution chromatography (Ion-exchange) outline the order of elution for the following cationic species: Cu2+, Fe3+, Ag+ and Na+? I understand it has to do with polarity, but in which sense i.e does the least polar/most polar species elute first? Thanks
Tuesday, January 13, 2015 at 1:59am

Chemistry
#6. If 10.0g of Aluminum carbonate(s) decomposes to produce aluminum oxide(s) and carbon dioxide(g), how many grams of CO2(g) are formed? If 5.00g is recovered experimentally what is the % yield?
Tuesday, January 13, 2015 at 12:20am

Chemistry
How many grams of water will be produced in the complete combustion of 20.0g of Octane, C8H18(g) and 50.0g Oxygen gas?
Tuesday, January 13, 2015 at 12:14am

Chemistry
How many grams of water are produced when 10.0g of Butane, C4H10(g) completely combust with 2.50 moles of Oxygen gas?
Tuesday, January 13, 2015 at 12:12am

Chemistry
A strip of zinc medal weighing 2.00 grams is placed in an aqueous solution containing 150.ml of .750M Tin(II) nitrate. Determine the grams of tin metal that will be precipitated.
Tuesday, January 13, 2015 at 12:10am

Chemistry
Lead(II) carbonate decomposes to form Lead(II) oxide and carbon dioxide. If 5.oo grams of the reactant decomposes to produce 1.52 grams of Lead(II) oxide experimentally, what is the theoretical yield and percent yield.
Tuesday, January 13, 2015 at 12:08am

chemistry
The molarity of a kool-aid packet is 0.365M. How many grams of sucrose (C12H22O11) are in 200mL of the kool-aid drink? --- I know that the molar mass is 342.29648 g/mol kool-aid. I'm not sure on how to find the grams of the solute.
Monday, January 12, 2015 at 10:51pm

Chemistry
HAve to find a formula to work out the energy required to thermally decompose water into hydrogen and oxygen.
Monday, January 12, 2015 at 9:56pm

Chemistry
2Mg(s) + O2(g) 2MgO(s) If 9.92 g of Mg reacts with 8.52 g of O2. How many grams of MgO could be produced? I am just very confused and need an answer so that I can look back on how you got there . . .
Monday, January 12, 2015 at 9:50pm

Chemistry
As a purity check for industrial diamonds, a 22 - carat diamond (1 carat = 0.2g) is heated to 63 degrees C and immersed in 26g of water in a constant pressure calorimeter. The initial temperature of the water is 23 degrees C. Calculate the ΔT of the water and of the ...
Monday, January 12, 2015 at 8:01pm

chemistry Drbobz222
How do i convert mols CaCl2 to AgCl
Monday, January 12, 2015 at 7:38pm

Chemistry
if 50 grams of sodium hydroxide mixed with 25 grams of hydrochloric acid how many grams of salt can be formed?
Monday, January 12, 2015 at 7:29pm

chemistry check my answer
In an acid base titration 32.5 ml of sodium hydroxide were neautralized by 17.6 ml of 0.180 mol/l sulfuric acid. Calculate the concentration of the sodium hydroxide. I asked this question earlier but i wanted to make sure i got the right answer My answer: 0.36 mol/L is this ...
Monday, January 12, 2015 at 7:20pm

Chemistry
2C2H2(g) + 3O2(g) 4CO(g) + 2H2O(g) What is delta G° for this reaction in J/mol? (T = 298.17 K)
Monday, January 12, 2015 at 7:01pm

chemistry am i right
Balance and complete equation H2SO4 + Na2CO3 ---> Na2SO4 + H2O + CO2
Monday, January 12, 2015 at 6:55pm

chemistry
What mass of precipitate is formed when 0.750 L of 2.50 mol/L CaCl2 reacts with 650 mL of 1.75 mol/L AgNO3
Monday, January 12, 2015 at 6:49pm

chemistry
What volume of 1.34 mol/L hydrochloric acid, HCI is expected to react completely with 6.89 g of calcium
Monday, January 12, 2015 at 6:04pm

chemistry
The ionic equation and net ionic equation and balance equation: A) Ca(OH)2 + HNO3 --> B) H2SO4 + Na2CO3 --->
Monday, January 12, 2015 at 6:03pm

Chemistry
Calculate the heat transferred when a 23 g of iron nail is cooled from 67oC to 20oC. The specific heat of iron is 0.45 J/goC.
Monday, January 12, 2015 at 5:57pm

Chemistry
A skillet made of Iron (Fe) weighing 1.8 kg is heated on a stove to a temperature of 202 degrees C. If the skillet is removed from the stove and allowed to cool to room temperature (21 degrees C), how much heat must be removed from the skillet. The specific heat of Iron is 0....
Monday, January 12, 2015 at 5:56pm

chemistry
A 0.248 M ZnCO3 solution is made from 21.4 g of solute? What is the volume of the solution?
Monday, January 12, 2015 at 5:46pm

chemistry
What volume of 1.34 mol/L hydrochloric acid, HCI, is expected to react completely with 6.89 g of calcium?
Monday, January 12, 2015 at 5:28pm

chemistry
Write a balanced equation, ionic equation and the net ionic equation for the following: A) Li2SO4 + Sr(NO3)3 ---> B) H2SO4 + Na2CO3 --->
Monday, January 12, 2015 at 5:06pm

chemistry
In an acid base titration,25.0 ml of nitric acid, HNO3, were neautralized by 28.0 mL of 0.209 mol/L calcium hydroxide, Ca(OH)2. What is the concentration of the nitric acid?
Monday, January 12, 2015 at 4:53pm

Chemistry
In an acid base titration 32.5 mL of sodium hydroxide, NaOH, were neutralized by 17.6 mL of 0.180 mol/L sulfuric acid, H2SO4. Calculate the concentration of the sodium hydroxide.
Monday, January 12, 2015 at 4:50pm

Chemistry
When a chemist burns ammonia according to the reaction below she finds that the reaction releases heat. (It is exothermic.) 4NH3(g) + 3O2(g) 2N2(g) + 6H2O(g) The enthalpy of the reaction DH = -1267 kJ. What is the enthalpy change (in kJ) when 7 grams of ammonia are burned?
Monday, January 12, 2015 at 4:42pm

Chemistry
Calculate the total heat (in Joules) needed to convert 1.602 x 101 grams of ice at -1.383oC to liquid water at 8.554 x 101oC. Melting point at 1 atm 0.0oC Cwater(s) = 2.09 J/goC Cwater(l) = 4.18 J/goC delta Hofus = 6.02 kJ/mol
Monday, January 12, 2015 at 4:41pm

Chemistry
1.984 g of a hydrate of K2CO3 is dissolved in 250. mLs of H2O. 10.0 mLs of this solution is tirade against 0.100 M HCl, producing the following results. Flask 1 - Initial 0, final 9.2 Flask 2 - Initial 9.2, final 18.3 Flask 3 - initial 18.3, final 27.8 Flask 4 - initial 27.8, ...
Monday, January 12, 2015 at 3:59pm

chemistry
i have a homework packet that i am struggling with can you please help me my first question is i have to finish the following equation to balance it out my question is 3Fe3O4+blankAl→blankAl2O3+blankFe now i tried and i got 3Fe3O4+2A=2Al2O3+2Fe i dont know if thats right...
Monday, January 12, 2015 at 12:59pm

Chemistry
Calculate the pH and pOH of a hydrochloric acid solution prepared by dissolving 30.50-kg of hydrogen chloride gas in 806-L of water at SATP.
Monday, January 12, 2015 at 12:08pm

ap chemistry
how do you find the mass of dehydrated sample? mass of crucible and cover- 30.95 g mass of hydrated sample, crucible, and cover- 32.75 g mass of hydrated sample-? mass of dehydrated sample, crucible and cover- 1st weighing-32.47 g mass of dehydrated sample, crucible, and cover...
Monday, January 12, 2015 at 11:13am

chemistry
how many HCl needed to dissolve 1 grams of Al2O3.
Monday, January 12, 2015 at 5:39am

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Post a New Question | Current Questions

Homework Help: Science

Members