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January 29, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
What is the form in which phosphorus exists in plant food and what ion could you use to precipitate the phosphorus.
Friday, January 23, 2015 at 3:52pm

chemistry
Please help what is the molecule CH3CH2CHCHCH3
Friday, January 23, 2015 at 3:21pm

chemistry
What mass of KBr is contained in 50.0 mL of a 5.10 M solution of KBr?
Friday, January 23, 2015 at 2:47pm

chemistry
How do gas particles exert pressure on their container?
Friday, January 23, 2015 at 2:42pm

integrated physics and chemistry
The velocity of a car traveling north decreases from 20 m/s to 12 m/s in 32 seconds. What is the acceleration of the car? I answered it as 0.25 m/s^2 North. Is this correct?
Friday, January 23, 2015 at 1:51pm

Chemistry
Zinc iodide is dissolved in 2.5 L of water to make a solution. 1.00 L of this solution is then diluted to make 12.0 L of a 0.50 M solution. What mass of zinc was added to make the original solution?
Friday, January 23, 2015 at 1:46pm

Chemistry (CHEM1380)
Let the temperature T in a body be independent of z so that it is given by a scalar function: T = 9x^2 + 4y^2 . Identify the isotherms T(x,y) = const.
Friday, January 23, 2015 at 12:23pm

chemistry
Is sodium isotonic with Mg²+
Friday, January 23, 2015 at 3:26am

Chemistry
The average concentration of chloride ions (molar mass = 34.353) in seawater is 19.353 grams per kilogram. The maximum allowable concentration of chloride ion in drinking water is 250 ppm by mass. How many times as much chloride ion is there in seawater than the maximum amount...
Thursday, January 22, 2015 at 10:40pm

chemistry
Solid lead(II) iodide was prepared by reacting 65.0 mL of a solution containing 0.218 M lead(II) ions with 80.0 mL of a solution containing 0.265 M iodide ions. If the actual yield of the reaction was 3.26 g, which choice is closest to the %yield of the reaction?
Thursday, January 22, 2015 at 9:44pm

Chemistry
In a titration experiment involving an unknown concentration of HCl and a 0.100M solution of NaOH(aq), it was determined that it took 12.5mL of NaOH to neutralize 20.0mL of the HCl(aq). Write a balanced chemical equation for this reaction and determine the concentration of the...
Thursday, January 22, 2015 at 7:07pm

Chemistry
Calculate the pH and concentration of H3O of a 0.285M HCl solution.
Thursday, January 22, 2015 at 7:04pm

Chemistry
Calculate the pH and concentration of H3O+ of a 0.285M oxalic acid solution.
Thursday, January 22, 2015 at 7:03pm

Chemistry
What is the pH of the resulting solution when 25.0mL of 0.100 HNO3(aq)are reacted with 20.0 mL of 0.175M NaOH(aq)? Is the resulting solution acidic or basic in nature?
Thursday, January 22, 2015 at 5:08pm

Chemistry
What is the pH of the resulting solution when 25.0mL of 0.100 HNO3(aq)are reacted with 20.0 mL NaOH(aq)? Is the resulting solution acidic or basic in nature?
Thursday, January 22, 2015 at 5:06pm

chemistry
Given: 2so2 + o2 -> 2so3 + 44kcal Which change increase the concentration of so4? a. increasing temperature b. increasing the concentration of o2 c. decreasing the pressure d. decreasing the concentration of so2
Thursday, January 22, 2015 at 3:18pm

Ionic compounds Scinece
3. What happens to the change on individual ions when they form ions? 11. Write the names of the two ions in each of the following compounds. (C) Na2O (E) Na3PO4 (G) NH4OH (H) Ca (NO3)2 8. Use the tables of metals, non-metals, and polyatomic ions and the Periodic table to name...
Thursday, January 22, 2015 at 2:48pm

Chemistry
What is the pH of a buffer solution of 0.125M Acetic acid and 0.250M Sodium acetate? the Pk of Acetic acid is 4.76
Thursday, January 22, 2015 at 1:33am

Chemistry
A 5.0ml sample of liquid requires 4.5 ml of a 0.093N NaOH solution. What is the titratable acidity of the liquid expressed as g/L Tartaric acid?
Thursday, January 22, 2015 at 1:29am

Chemistry
25.0 ml of a 0.13M HCL solution is titrated with 17.6 ml of NaOH. What is the Molarity of the NaOH?
Thursday, January 22, 2015 at 1:22am

Chemistry/Math
Calculate the following and round to the allowed number of significant figures 1. (18.00 x 1.5) / 0.00625 2.4.61 X 10^3 / 5.1008 x 10^-4 My answers 1. 4320 2. 9.037 x 10^-1 Please explain what I did wrong if I'm incorrect. Thank you
Thursday, January 22, 2015 at 12:07am

Chemistry
A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. Step 1. 0.001694g * 25ml * 1/155 g/mol= 0.0002732 mol Step 2. Volume of EDTA needed = 0.0002732 mol/ 0.008640 M = 0.03125 ...
Wednesday, January 21, 2015 at 11:07pm

chemistry
Calculate the number of grams of sulfuric acid in 1 gallon of battery acid if the solution has a density of 1.25g/mL and is 38.3{\rm \\%} sulfuric acid by mass.
Wednesday, January 21, 2015 at 10:43pm

chemistry
A mixture of N2(g) and H2(g) has mole fractions of .40 and .60, respectively. What is the density of the mixture at 1 bar and 0 degrees celsius?
Wednesday, January 21, 2015 at 10:09pm

chemistry
C6H12 = 9O2 --> 6CO2 = 6H2O + 3,690 kJ *Personally Balanced* What quantity of heat is produced if 32g of cyclohexane react with 95 L of oxygen at STP? *My work so far is below* 95L*(1 mol O2/22.4L) = 4.2 mol O2 What would be the next motive?
Wednesday, January 21, 2015 at 9:53pm

Chemistry
Calculate the mass of a 0.253-mL sample of a liquid with density 0.789 g/mL
Wednesday, January 21, 2015 at 9:52pm

chemistry
Calculate the volume in milliliters of a 5.41-g sample of a solid with a density of 3.01 g/mL
Wednesday, January 21, 2015 at 9:49pm

Chemistry (Re-post)
A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. So this is my working out for this section, Step 1. Moles of CoSO4 = 0.0001694mg * 25mL * (1mol/155g/mol) 2.732*10^-4. ...
Wednesday, January 21, 2015 at 6:21pm

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- <...
Wednesday, January 21, 2015 at 5:51pm

Chemistry
Calculate the percentage of by mass of nitrogen in ammonium nitrate Nh4 No3
Wednesday, January 21, 2015 at 5:43pm

Chemistry
How much energy (in kilojoules) is released when 15.2g of steam at 114.5∘C is condensed to give liquid water at 63.5∘C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6 J/(K⋅...
Wednesday, January 21, 2015 at 5:26pm

chemistry
How much work is done at 1.2 atm and 316 K when 1 mole of propane undergoes combustion? C3H8 (l) + 5O2 (g) → 3CO2 (g) + 4H2O (l)
Wednesday, January 21, 2015 at 4:18pm

Chemistry
A 5.00 g mixture of methane (CH4) and ethane (C2H6) is combusted in oxygen gas to produce carbon dioxide and water. If 14.09 g of CO2 is produced, how many grams of methane was in the original 5.00 g mixture ?
Wednesday, January 21, 2015 at 2:15pm

Chemistry
Bromine is a reddish-brown liquid. Calculate its density (g/mL) if 586g of the substance occupies 188 mL.
Wednesday, January 21, 2015 at 11:11am

chemistry
A 0.8743 g sample of KHP was titrated 42.45-mL of NaOH solution until the phenolphthalein endpoint. What is the molarity of the NaOH solution?
Wednesday, January 21, 2015 at 10:50am

Analytic chemistry
A solution of HClO4 was standardized by dissolving 0.3745 g of primary standard grade HgO in a solution of KBr. The liberated OH- required 37.99 mL of the acid to be neutralized. Find the molarity(M) of HClO4. The given balanced chemical equation is: HgO + 4Br- + H20 ===> ...
Wednesday, January 21, 2015 at 8:17am

Chemistry (Acid-Base)
Butanoic acid (Ka = 1.52 x 10-5) has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the concentration of butanoic acid in each phase when 20.0 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at (a) pH 4...
Wednesday, January 21, 2015 at 5:59am

Chemistry
The following data are for a liquid chromatographic column: Length of packing (L) 24.7 cm Flow rate 0.313 mL/min VM 1.37 mL VS 0.164 mL A chromatogram of a mixture of species A, B, C and D provided the following data Retention time Nonretained 3.1 - A = 5.4 B = 13.3 C = 14.1 D...
Wednesday, January 21, 2015 at 4:25am

Chemistry
How many grams of CaCl2 * 6H2O are required to make 500 milliliters of a solution having the same concentration of Cl- as one that was prepared by dissolving 75.6 grams of NaCl in enough water to make exactly 1 liter of solution?
Tuesday, January 20, 2015 at 11:20pm

AP Chemistry
Calculate the entropy change when 4.88 g of H2 reacts with O2 according to the reaction 2H2(g) + O2(g)→2H2O(ℓ)at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ)at 298 K is −285.8 kJ/mol. The corresponding free energy of ...
Tuesday, January 20, 2015 at 10:28pm

Chemistry
How would you know if a salt will produce a neutral, acidic or basic solution? I am quite confused. I know you first break them up into their ions but I dont know what to do next. For example: NaH2PO4= acidic soln Mg(HSO4)2= neutral soln Ca(CN)2= basic soln NH4F= acidic soln
Tuesday, January 20, 2015 at 10:07pm

chemistry
A 12.42 gram sample of a mixture of NaCl and CaCl2 is dissolved in water and all the chloride is precipitated as AgCl. If the AgCl precipitate has a mass of 31.70 grams. How do I find the mass percentage of each component in the original mixture?
Tuesday, January 20, 2015 at 9:32pm

AP Chemistry
A sample of air contains 12.8 µg/m3 of beryllium dust. How many atoms of beryllium are present in a room with dimensions of 8 feet by 13 feet by 15.1 feet? Answer in units of atoms
Tuesday, January 20, 2015 at 9:24pm

Chemistry
if you start with 20.0g of phosphorus 30.0g of oxygen gas, and 15.0g water, what is the maximum mass of phosphoric acid that can be formed?
Tuesday, January 20, 2015 at 9:08pm

AP Chemistry
A saturated solution of CaF2 (of MW 78.0 g/mol) contains 0.0167 grams per liter. What is the solubility product constant of CaF2?
Tuesday, January 20, 2015 at 8:32pm

AP Chemistry
The Ksp of Ni(CN)2 is 3.0 × 10−23. What is the molar solubility of Ni(CN)2 in a 0.065 M KCN solution? Answer in units of mol/L. I found that the normal molar solubility is 1.957x10^-8, but I don't know how the KCN solution affects it. Sig figs aren't ...
Tuesday, January 20, 2015 at 8:22pm

Chemistry
Virtually all the nitric acid manufactured commercially is obtained by the ammonia oxidization process. This involves this first step: Ammonia gas combines with oxygen to form nitrogen monoxide and water vapour. a) Write a balanced equation for the reaction 6 NH3 + 4 O2 -> ...
Tuesday, January 20, 2015 at 8:00pm

Chemistry
Our blood works mostly as a carbonic acid buffer which has an optimal buffering pH of about 6.4, the pH of blood is around 7.4. What is the advantage for the body of having the buffer at the non-optimal pH??
Tuesday, January 20, 2015 at 6:36pm

Chemistry
How would you know if a salt will produce a neutral, acidic or basic solution? I am quite confused. I know you first break them up into their ions but I dont know what to do next. For example: NaH2PO4= acidic soln Mg(HSO4)2= neutral soln Ca(CN)2= basic soln NH4F= acidic soln
Tuesday, January 20, 2015 at 4:33pm

chemistry
A mosquito fed on a solution containing phosphorous-32 is released. Phosphorous-32 has a half-life of 14 days. When the mosquito is recaptured 28 days later, what percentage of the original Phosphorus-32 will remain?
Tuesday, January 20, 2015 at 3:40pm

college chemistry
calculate the average kinetic energies of CH4 and N2 molecules at 273k and 546k
Tuesday, January 20, 2015 at 11:46am

Chemistry
Chemical properties of salts
Tuesday, January 20, 2015 at 10:03am

Chemistry
Calculate the change in pH if 10mL of 0.1M HCl is added to the buffer made by mixing 25 mL of 1.0 M CH3COOH and 25 mL of 0.5 M CH3COONa.
Monday, January 19, 2015 at 11:45pm

chemistry
In a soda acid fire extinguisher, concentrated sulfuric acid reacts with sodium hydrogen carbonate to produce carbon dioxide, sodium sulfate and water. How many moles of sodium hydrogen carbonate are produced from a reaction of 0.4 moles of sulfuric acid? Write the balanced ...
Monday, January 19, 2015 at 9:51pm

Chemistry
For another picnic, you want to make hamburgers with pickles, again without having any left over. You need to balance the number of packages of buns (which usually contain 8 buns) with the number of packages of hamburger patties (which usually contain 12 patties) and the ...
Monday, January 19, 2015 at 9:23pm

Chemistry
The following data are for a liquid chromatographic column: Length of packing (L) 24.7 cm Flow rate 0.313 mL/min VM 1.37 mL VS 0.164 mL A chromatogram of a mixture of species A, B, C and D provided the following data Retention time | Width of Base Nonretained 3.1 - A 5.4 0.41 ...
Monday, January 19, 2015 at 9:14pm

Chemistry
A 0.200 g sample containing Cu is dissolved, and a diethyldithiocarbamate coloured complex is formed. The solution is then diluted to 50.0 mL and the absorbance measured as 0.260. A 0.500 g sample containing 0.240% Cu is treated in the same manner, and the resulting solution ...
Monday, January 19, 2015 at 6:45pm

Chemistry
A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. moles CoSO4 = 0.001694mg/ 155 g/mol = 1*10^-6 mol Moles EDTA = 1*10^-6mol/0.025L = 0.000436 mol/L (in 25 mL) This is where...
Monday, January 19, 2015 at 6:38pm

Chemistry
Butanoic acid (Ka = 1.52 x 10-5) has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the concentration of butanoic acid in each phase when 20.0 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at (a) pH 4...
Monday, January 19, 2015 at 6:24pm

Chemistry
If equal volumes of the following are combined, would they form buffered solutions? Why or why not? .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 someone could explain it to me. ...
Monday, January 19, 2015 at 6:05pm

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? I dont know which formula to use
Monday, January 19, 2015 at 5:48pm

Chemistry
Please help! If equal volumes of the following are combined, would they form buffered solutions? Why or why not? .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 someone could explain...
Monday, January 19, 2015 at 5:48pm

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

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