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June 1, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
What volume of 0.149 M HCl must be added to 1.00x10^2 mL of 0.285 M HCl so that the resulting solution has a molarity of 0.205 M? Assume that the volumes are additive.
Monday, October 12, 2015 by Faith

Chemistry
I am told to find the "Total heat capacity of the system in the Calorimeter" All I have is this equation: Csys=Ccal+Csol What is this Csys? and how do I figure out how to use this equation? Thankyou
Monday, October 12, 2015 by Adam

Chemistry
Suppose that atomic masses were based on the assignment of a mass of 12.000 g to 1 mol of carbon, rather than 1 mol of ^12C. What would the atomic mass of oxygen be? (The atomic masses of carbon and oxygen based on the assignment of 12.000 g to 1 mol of ^12C are 12.011 amu and...
Sunday, October 11, 2015 by Anonymous

Chemistry
Neutron stars are composed of solid nuclear matter, primarily neutrons. Assume the radius of a neutron is approx. 1.0 x 10^-13 cm. Calculate the density of a neutron. [Hint: For a sphere V=(4/3) pi r^3. Assuming that a neutron star has the same density as a neutron, calculate ...
Sunday, October 11, 2015 by Anonymous

Chemistry
Nitric acid, HNO3, is produced from ammonia and oxygen by the consecutive reactions: 4NH3 + 5O2 => 4NO3 + 6H2O 2NO + O2 => 2NO2 3NO2 + H2O => 2HNO3 + NO How many grams of nitric acid can be obtained from 1.00kg NH3 if NO in the third reaction is not recycled? Why is ...
Sunday, October 11, 2015 by Faith

Chemistry
An alpha particle, ^4 He^2+, has a mass of 4.00151 amu. Find the value of its charge-to-mass ratio in C/kg.
Sunday, October 11, 2015 by Anonymous

chemistry
A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.73 nm. It then gives off a photon having a wavelength of 1094 nm. What is the final state of the hydrogen atom?
Sunday, October 11, 2015 by michelle

chemistry - HELP!
The equilibrium constant, Kc, for the reaction A(g) + B(g) <-->AB(g) is 115 at 25 degrees C. If 1.580 x 10^(‐1) mol of A and 4.721 x 10^(‐5) mol of B are introduced into a 1.00 liter vessel at 25 degrees C, calculate the equilibrium concentration of all ...
Sunday, October 11, 2015 by Sheri

Chemistry
glycine + valine-->glycine - valine+H2O What happens with this reaction and where does water molecule come from
Sunday, October 11, 2015 by Sharon

Chemistry
Reaction: C6H11OH(l) ==> C6H10(l) + H2O(l) Calculate the mass of cyclohexanol (C6H11OH) needed to produce 45.0g cyclohexene (C6H10) by reaction if the reaction has a 86.2% yield and the cyclohexanol is 92.3% pure. Usually this problem would be fairly easy, but the purity is...
Sunday, October 11, 2015 by Faith

Chemistry
Potassium permangenat reacts with sodium oxalate to form carbon dioxide and Mn2+.determine the consentration of a permangenate solution.since the reaction runs in acidic conditions, 25ml of 2 M sulfuric acid was added to 20.00ml of the unknown permangenate solution. It was ...
Sunday, October 11, 2015 by Aida

algebra
A chemistry lab wants to prepare 300 liters of 25% acid solution. In stock he has 20% and 35% acid solutions. How many liters of each in stock mixture should he mix tp prepare a 300-liter mixture?
Sunday, October 11, 2015 by Anonymous

Chemistry
Why does the height of the precipitate of strontium nitrate and sodium carbonate go up as the volume of strontium nitrate increase?
Sunday, October 11, 2015 by Anonymous

Chemistry
How many mL of 1.67M sulfuric acid would it take to neutralize 26.6mL of 3.12M sodium hydroxide?
Sunday, October 11, 2015 by Carol

Chemistry
Calculate Delta H for the reaction CH4(g)+NH3(g)-->HCN(g)+3H2(g) given, N2(g)+3H2(g)->2NH3(g) DeltaH=-91.8kj C(s)+2H2(g)->CH3(g) DeltaH=-74.9kj h2(g)+2C(s)+N2(g)->2HCN(g) DeltaH=270.3kj
Sunday, October 11, 2015 by James

Chemistry
The boiling point of pure water in Winter Park, CO ( elev. 9000 ft) is 94 oC. What is the boiling point of a solution containing 11.3 g of glucose (180 g/mol) in 55 mL of water in Winter Park? Kb for water = 0.512°C/m.
Sunday, October 11, 2015 by JPR

Chemistry
determine the vapor pressure lowering at 27 C of a solution of 750g of sucrose, dissolved in 180g of water. The vapor pressure of pure water at 27 C is 26.7 torr. Assume the solution is ideal
Sunday, October 11, 2015 by Anonymous

science
am stuck on the titration on maleic acid. am kindly asking for analytical chemistry by skoog.pdf. this assighnment is killing me. thank you
Sunday, October 11, 2015 by rexina

Chemistry
A 2.00 g impure sample of MgO (molar mass 40.3 grams) was completely dissolved in 50.0 mL of 1.000 M H2SO4. The excess acid was back-titrated with 25.0 mL of 0.800 M NaOH. Calculate the percent purity of the MgO sample. [80.6 %] MgO(s) + H2SO4(aq) MgSO4(aq) + H2O(l)
Sunday, October 11, 2015 by Anonymous

Chemistry
A particular vinegar contains 4.0% CH3COOH by mass. It reacts with sodium carbonate to produce sodium acetate, carbon dioxide, and water. How many grams of carbon dioxide are produced by the reaction of 5.00 mL of this vinegar with an excess of sodium carbonate? The density of...
Saturday, October 10, 2015 by Faith

Chemistry
Three colorless solutions in test tubes, with no labels, are in a test tube rack on the lab bench. Lying beside the test tubes are three labels: potassium iodide, KI, silver nitrate, AgNO3, and sodium sulfide, Na2S. You are to place the labels on the test tubes using only the ...
Saturday, October 10, 2015 by Diana

Chemistry
Write the half reactions and the balanced equation for the galvanic cell Cu(s)| Cu2+(aq)|| Cu+(aq)| Cu(s). What is the smallest possible integer coefficient of Cu2+(aq) in the combined balanced equation? When put together the balanced equation is just Cu + Cu+ = Cu2+ + Cu. So ...
Saturday, October 10, 2015 by Alex

Chemistry
The equation is: CuSO4(s) + Zn(s) -> Cu(s) + ZnSO4(aq) 3.22 g of powdered zinc is added to 200ml of 0.5M copper sulfate solution. What mass of copper is deposited? Hi guys. I am confused about the stoichmetry question. Q: The equation is: CuSO4(s) + Zn(s) -> Cu(s) + ...
Saturday, October 10, 2015 by G

Chemistry
When 22.3 mL of 1.00 M AgNO3 is mixed with 21.7 mL of 1.50 M NaCl, the temperature of the mixture rises for 21.6 degrees C to 29.7 degrees C. The mass of the aqueous mixture is 45.9 grams and its specific heat capacity is 3.94 J/grams degrees C
Saturday, October 10, 2015 by Sarah

chemistry
Write the balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI. Include phases. What mass of precipitate will form if 1.50 L of highly concentrated Pb(ClO3)2 is mixed with 0.350 L of 0.290 M NaI? Assume the reaction goes to completion.
Saturday, October 10, 2015 by jeff

Chemistry
* From your hint, I arrived at an answer of 3.46 x 10^4 but the answer key says 3.11 x 10^5 Ib. A backyard swimming pool holds 185 cubic yards (yd^3) of water. What is the mass of the water in pounds? DrBob222: 185 yd^3 x (3 ft/yd) x (3 ft/yd) x *3 ft/yd) = ? cubic feet. ...
Saturday, October 10, 2015 by Anonymous

Chemistry
The single proton that forms the nucleus of the hydrogen atom has a radius of approximately 1.0 x 10^-13 cm. The hydrogen atom itself has a radius of approximately 52.9 pm. What fraction of the space within the atom is occupied by the nucleus.
Saturday, October 10, 2015 by Anonymous

Chemistry
A backyard swimming pool holds 185 cubic yards (yd^3) of water. What is the mass of the water in pounds?
Saturday, October 10, 2015 by Anonymous

chemistry
onsider the following reaction between sulfur trioxide and water: SO3(g)+H2O(l)→H2SO4(aq) A chemist allows 61.5 g of SO3 and 11.2 g of H2O to react. When the reaction is finished, the chemist collects 59.3 g of H2SO4.
Friday, October 9, 2015 by luis

chemistry
What is the (H3O+) and the ph of a buffer that consists of 0.25M HNO2 and 0.69M KNO2? (Ka of HNO2 = 7.1 x 10^-4) is this right? pH of acidic buffer pH = pka + log(salt/acid) pka = -log ka = -log(7.1*10^(-4)) = 3.15 = 3.15+log(0.25/0.69) pH = 2.71 [H3O+] = 10^-pH = 10^(-2.71...
Friday, October 9, 2015 by patrick

Chemistry
A sphere of metal has a radius of 5.7 cm and a density of 8.33 g/cm^3. What is the mass of the sphere? Answer in units of g.
Friday, October 9, 2015 by G

Chemistry
What is the mass of water required to fill a circular hot tub 3.6 m in diameter and 1.3 m deep? Answer in units of kg.
Friday, October 9, 2015 by G

Organic Chemistry
Simple Distillation: What is the molar composition of the vapor in equilibrium with a boiling liquid that has a composition of 60% A and 40% B? I know that the vapor should be richer in the lower-boiling substance, which is A in this case. And: If a sample of the vapor has the...
Friday, October 9, 2015 by Sasha

chemistry
What is the mass percent of nitrogen in ammonium carbonate, (NH4)2CO3?
Friday, October 9, 2015 by leona

chemistry
If 3.15 mL of vinegar needs 42.5 mL of 0.115 M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in a 1.40 qt sample of this vinegar?
Friday, October 9, 2015 by Anonymous

AP Chemistry
Hey guys stuck again! Bromine and chlorine dissolve in carbon tetrachloride and react to form BrCl: Br2 + Cl2--> 2BrCl (in CCl4) Under equilibrium conditions [Br2] = [Cl2] = 0.00430 M and [BrCl] = 0.0114 M. The addition of 0.100 moles of Br2 to exactly one liter of this ...
Friday, October 9, 2015 by Allie

chemistry
If the charge-to-mass ratio of a proton is 9.58 × 107 coulomb/kilogram and the charge is 1.60 × 10-19 coulomb, what is the mass of the proton?
Friday, October 9, 2015 by annonomus

Engineering Chemistry
One reaction that destroys O3 molecules in the stratosphere is NO + O3 → NO2 + O2 When this reaction was studied in the laboratory, it was found to be first order with respect to both NO and O3, with a rate constant of 1.9 x 104 L mol-1 s-1. If [NO] =1.2 x 10-5 mole L-1 ...
Friday, October 9, 2015 by Michelle Zuke

AP Chemistry
Hey guys! Stuck on another one: The reaction 2N2O(g) 2N2(g) + O2(g) has Kc = 3.5 × 10-18 at a particular temperature. If 0.20 mol of N2O is placed in a 1.00 liter container, what will be the N2 concentration when equilibrium is reached? 1. 4.4 × 10-9 mol/liter 4. 3...
Thursday, October 8, 2015 by Allie

Chemistry RUSH, Please
1) How many grams of CH4 (MM = 16.043) are needed to react with 50.0g of CL2 (MM=70.91)? 2) What is the molarity of a solution prepared by dissolving 20.0 g of methanol, CH3OH, oara sufficient water to prepare 500 mL of solution? Show calculations
Thursday, October 8, 2015 by Maria

AP Chemistry
Hey guys! Stuck on some problems: 1)Consider the following chemical reaction between gases: 2N2O(g) + O2(g)->4NO(g) + heat The amount of O2 at equilibrium will be decreased by: 1. Adding more NO(g). 2. Increasing the pressure by decreasing the volume. 3. Removing N2O. 4. ...
Thursday, October 8, 2015 by Allie

chemistry
Nitrobenzene, C6H5NO2, is prepared from benzene, C6H6, and nitric acid, HNO3. The other product of the reaction is water. When 22.4 g of benzene is reacted with an excess of nitric acid, 31.6 g of nitrobenzene is produced. What is the percent yield for this reaction?
Thursday, October 8, 2015 by shannon

chemistry
In the manufacture of iron, carbon monoxide reduces iron oxide. Why isn't hydrogen used?
Thursday, October 8, 2015 by Clive

chemistry (Organic)
According to the two reactions below; 1-chloro-2,2-dimethylbatune + (warm NaOH 3)) 1-chloro-2-methylpropane + (cold dil.NaOH) 1) identify whether the reactions are Nucleophilic Substitutions (SN) or Elimination (E) reaction. 2) Complete the reaction mechanismin each and name ...
Thursday, October 8, 2015 by johnny

chemistry
Describe how one would prepare these solutions in the laboratory, using weights reagents and volumes of solutions: -500 mL of .100M K2Cr)4 stock solution from pure K2CrO4(s) -10mL of .0025M K2CrO4(aq) from .100M K2CrO4(aq) -What would the concentrations of FeSO4 and KCL be if ...
Thursday, October 8, 2015 by Lay

general chemistry
a solution of sulfuric acid was titrated with sodium hydroxide. if you took 23.7 mL of .025 M NaOH to reach the endpoint with a 5.0 mL sample of the acid what was its concentration?
Thursday, October 8, 2015 by Lay

Chemistry
how many grams of NaOH do you need to prepare a 3.00 x 10^2 mL stock solution of 2.00 M NaOH
Wednesday, October 7, 2015 by Alexander

Chemistry
how can two clear solutions mix and produce a cloudy precipitate- what is going on? Is this good or can I add something else? When two clear solutions mix together and produce a cloudy precipitate, it means that the compound that was created, was insoluble, causing a full ...
Wednesday, October 7, 2015 by Finn

Chemistry
4.Report your answer in correct significant figures. A.1.32*10^4cm+2.1*10^2
Wednesday, October 7, 2015 by anonymous

chemistry (inorganic) reflection planes
how many planes of reflection (sigma v) does the letter "H" have? an infinite amount? this is for an intro to group theory / symmetry operations.
Wednesday, October 7, 2015 by paul

Chemistry
How do halogens (Cl2, Br2, I2) react with halides (Cl-, Br-, I-)? Can we explain this reactivity?
Wednesday, October 7, 2015 by Anonymous

Chemistry
What is the relationship between the relative reactivities of the halogens when compared to the relative reactivity of the halides?
Wednesday, October 7, 2015 by Anonymous

Chemistry
A 76.00-pound flask of mercury costs $150.00. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. Following intermediate values include grams, cubic centimeters and cubic inch. I have no idea ...
Wednesday, October 7, 2015 by Jenny

chemistry
Find the volume of a 2.5 M solution of sulfuric acid required to prepare 300.0 mL of 0.1 N solution of sulfuric acid
Wednesday, October 7, 2015 by Cole

chemistry
How many moles of platinum would be in 10.0 g of this metal?
Wednesday, October 7, 2015 by Lauren

Chemistry
How do magnesium atoms form ions? What about oxygen atoms?
Wednesday, October 7, 2015 by Trinity

chemistry
A graduated cylinder contains 17.0 mL of water. What is the new water level after 31.6 g of silver metal with a density of 10.5 g/mL is submerged in the water
Wednesday, October 7, 2015 by timmy

Chemistry
A Stock solution has a total volume of 1.5l. It is diluted by removing 10 ml of the stock and adding 90 ml of water. the diluted solution has a concentration of the solute of 40mg/l a, what is the concentration of the solute in the stock solution? b, How much solute is present...
Tuesday, October 6, 2015 by Tony Ayo

CHEMISTRY
is this right? 5. After heating the crucible is set on the lab bench where it is contaminated with the cleaning oil used to clean the lab bench but before its mass is measured. The analysis continues where the mass of the anhydrous salt is determined. While heating, the ...
Tuesday, October 6, 2015 by Diana

CHEMISTRY
I also need help in this please: Suppose the original sample is unknowingly contaminated with a second anhydrous salt. Will the reported percent water in the hydrated salt be too high, too low, or unaffected by its presence? Explain. is it low? if so, can you explain in some ...
Tuesday, October 6, 2015 by Diana

Chemistry
2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g) In the equation, if 14 L of ethane (C2H6) and 14 L of oxygen (O2) combined and burned to completion, which gas will be leftover after the reaction, and what is the volume of that gas remaining?
Tuesday, October 6, 2015 by Giselle Meza

Chemistry
How many moles of chloride ions are in 100mL of a 0.3molar solution of AlCl3? #moles Cl =(.3M AlCl3)(.1L)(105g/mol / 132g/m0l)
Tuesday, October 6, 2015 by Kim

chemistry
In a chemistry experiment, a student measures the density of iridium (Ir) metal as 21.52 g/cm3. The actual density of Ir metal is 22.65 g/cm3. What is the percent error of the student's measurement?
Tuesday, October 6, 2015 by SAM

Chemistry
A sample that is 63.9 % chloride by mass is dissolved in water and treated with an excess of AgNO3. If the mass of the AgCl precipitate is 1.045g, what was the mass of the original sample?
Tuesday, October 6, 2015 by Ashley

Chemistry
. Show a chemical reaction by which hardness is added to water that also explains the formation of caves in limestone formations?
Tuesday, October 6, 2015 by Lee

Chemistry
30cm^3 of a mixture of methane and ethyne require 70cm^3 of oxygen for complete combustion. Calculate the composition of the mixture.
Tuesday, October 6, 2015 by Khadeejah

Himma International College Minna
Chemistry: 30cm^3 of a mixture of methane and ethyne require 70cm^3 of oxygen for complete combustion. Calculate the composition of the mixture
Tuesday, October 6, 2015 by Khadeejah

Chemistry
Could someone please walk me through how to solve this problem: A sample that is 63.9 % chloride by mass is dissolved in water and treated with an excess of AgNO3. If the mass of the AgCl precipitate is 1.045g, what was the mass of the original sample?
Tuesday, October 6, 2015 by Ashley

Chemistry
A 453 mL solution has a chloride concentration of 0.0253 M. This solution was prepared by adding solid FeCl3 to water. How many grams of FeCl3 are required?
Monday, October 5, 2015 by Kim

chemistry
Find the equilibrium constant for the reaction Cr(s) + Zn2+(aq) → Cr2+(aq) + Zn(s) if the standard cell emf is −0.76 V at the cathode and −0.91 V at the anode. R T F = 0.025693 V
Monday, October 5, 2015 by jack hoff

Chemistry
A 0.1592g sample of a hydrocarbon upon combustion analysis produces 0.5008g CO2. Its molar mass is found in another experiment to be 70g mol. Determine the empirical formula, and its molecular formula. I completely messed up this question, and I don't know where I wen'...
Monday, October 5, 2015 by Sarah

chemistry
A student is asked to standardize a solution of barium hydroxide. He weighs out 0.986 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 27.8 mL of barium hydroxide to reach the endpoint. A. What is the molarity of the barium hydroxide ...
Monday, October 5, 2015 by charlotte

Organic Chemistry
Describe why an unsubstituted C6 ring doesnt have any steric strain, torsional strain or angle strain.
Monday, October 5, 2015 by A

Chemistry
15.00mL sample of a solution of H2SO4 of unknown concentration was titrated with 0.3200 N NaOH. The titration required 21.30mL of the base. What was the normality of the acid solution? what was the molarity of the acid solution?
Monday, October 5, 2015 by Mark

Chemistry
I need a balanced chemical equation for the titration of potassium iodate (KIO3^2-) and sodium thiosulfate (Na2S2O3^2-). This is what I have, but I was wondering if I should cancel the spectator ions: Na2S2O3 (aq) + 2KIO3 (aq) --> K2S2O3 (aq) + 2NaIO3(aq)
Monday, October 5, 2015 by Ronnie

chemistry
As electrons move from the higher to the lower energy level, they release energy and ________ occurs. excitation ground state emission quantum state
Monday, October 5, 2015 by help me please

chemistry
The following describes the process of an atom emitting light. Place the steps in order: (I already know the first two steps are: 1. Energy is absorbed by electrons and excitation occurs and 2. Electrons move from the ground state to the excited state.) Electrons are unstable ...
Monday, October 5, 2015 by What Teh Heck

Chemistry
The mass of a gold coin was measured three times and each measurement was made to five digits. The mass values were 23.319g, 23.341 g, and 23.296g. the average mass was reported as 23.32 g. The actual mass of the coin is 25.5631g. Why is the average mass of the gold coin ...
Monday, October 5, 2015 by Anonymous

chemistry
How do you think this relates to fireworks? In your explanation be sure to use the following key terms: Ground state Excited state Photon Energy Spectrum
Monday, October 5, 2015 by Jacob Harver

organic chemistry
the color change at the endpopint should persist for 30 second why
Monday, October 5, 2015 by yve

Chemistry
What is the balanced net ionic equation for the reaction between the permanganate ion and the ferrous ion in acid solution. What is the number of moles of ferrous ion that could be oxidized by 1.2×10^-2 moles of permanganate ion? Honestly don't understand a single ...
Sunday, October 4, 2015 by Minset

Chemistry
Compare the rate of effusion of carbon dioxide with that if hydrogen chloride at the same temperature and pressure.
Sunday, October 4, 2015 by Cade

Chemistry
I'm having trouble understanding hybrid atomic orbitals. Could you please explain? Thanks
Sunday, October 4, 2015 by Anonymous

Chemistry
How many grams of iron at 200.0 c must be placed in 200.0 g of water at 18.0 c so that the temp of both will be 30.0 c ? Okay so the SH of iron = .106 This is what I have set up.. Not sure if I'm going at this the right way.. (.106) (m) (170.0) = (1.0) (200.0) (12.0) I don...
Sunday, October 4, 2015 by John

chemistry
The weak acid HQ has pKa of 4.89. Calculate the (OH-) of 0.500 M HQ This is what I have: pKa = 4.89 so Ka = 10^-4.89 = 1.29x10^-5 Ka = 1.29x10^-5 = [H+][Q-] / [HQ] 1.29x10^-5 = x^2 / 0.046 - x x^2 + 1.29x10^-5x - 5.93x10^-7 = 0 x = [H+] = 7.64x10^-4M pH = -log[H+] = 3.12 1....
Sunday, October 4, 2015 by patrick

Chemistry
2 NaIO3(aq) + 5 NaHSO3(aq) → 3 NaHSO4(aq) + 2 Na2SO4(aq) + H2O(ℓ) + I2(aq) What is the theoretical yield of I2 if you mixed 16.0 g of NaIO3 with 120 mL of 0.853 M NaHSO3?
Sunday, October 4, 2015 by Julian

Chemistry
Suppose you dilute 20.0 mL of a 0.130 M solution of Na2CO3 to exactly 100.0 mL. You then take exactly 15.0 mL of this diluted solution and add it to a 250-mL volumetric flask. After filling the volumetric flask to the mark with distilled water (indicating the volume of the new...
Sunday, October 4, 2015 by Julian

Chemistry
If 75.0 g of metal at 75.0 c is added to 135 g of water at 15 c the temp of water rises to 18.3 c what is the specific heat of the metal..? Can someone please help me plug the #s into the specific heat formula I'm very confused as to were to plug these #s in
Sunday, October 4, 2015 by Abby

chemistry
The weak acid HQ has pKa of 4.89. 1)Calculate the [H3O+] of .035 M HQ. 2)Calculate the (OH-) of 0.500 M HQ ....Am I correct? a) pKa = 4.89 => - log(Ka) = 4.89 => Ka = antilog(- 4.89) = 10-4.89 = 1.29x10-5 1. Given concentration of HQ, C = 0.035 M Dissociation of HQ is ...
Sunday, October 4, 2015 by patrick

chemistry
What is the conjugate acid for NH2- ? N3- NH2- NH4+ H+ I thought it was NH4+ but it was wrong. Isn't it suppose to be NH3+ but they don't have on this choices.
Sunday, October 4, 2015 by kris

Organic Chemistry
Write the equation for the reaction that occurs when sodium carbonate is added to the mixture of the reaction and water (hint: a gas is evolved). This is for benzocaine experiment
Sunday, October 4, 2015 by Peter

Chemistry
Calculate the amount of heat (calories) needed to raise the temp of 10.0g of water from 10.0 c to 75.0 c ??
Sunday, October 4, 2015 by Anonymous

ap chemistry
The weak acid HQ has pKa of 4.89. 1)Calculate the [H3O+] of .035 M HQ. 2)Calculate the (OH-) of 0.500 M HQ ....Am I correct? a) pKa = 4.89 => - log(Ka) = 4.89 => Ka = antilog(- 4.89) = 10-4.89 = 1.29x10-5 1. Given concentration of HQ, C = 0.035 M Dissociation of HQ is ...
Sunday, October 4, 2015 by patrick

Chemistry
How would you write the equation to represent "Nitrogen and Oxygen react to form Nitrogen Dioxide".
Sunday, October 4, 2015 by Elle

Chemistry
Write the dissociation equation for iron(II) ammonium sulfate hexahydrate in water . Fe(NH4)2(SO4)2 * 6H2O --> __?________ I know dissociate means to take apart so for example; NaCl would look like Na^+ + Cl^- And another one like: Fe2(SO4)3 would look like 2Fe^+3 + 3SO4^-...
Sunday, October 4, 2015 by Christine

Chemistry (Le Chatelier's Principal)
Methanol has the formula CH3OH and can be produced by the reaction of carbon monoxide with hydrogen gas. CO + 2 H2 <--> CH3OH + heat In an attempt to maximize the yield of methanol (amount of methanol produced), a chemist would try to shift the ...
Sunday, October 4, 2015 by Terry

chemistry
acetylsalicylic acid (aspirin) HC9H7O4 is the most widely used pain reliever and fever reducer. Find the PH of 0.040 M aqueous aspirin at body temperature (Ka at 37 C = 3.6 x 10-4) is this correct? initial concentration is 0.040 M. let change in concentration to equilibrium ...
Sunday, October 4, 2015 by patrick

chemistry
How many moles of H3O+ or OH- must you add per liter of HA solution to adjust its pH from 9.75 to 9.01? Assume a negligible volume change. ……….x 10………Moles of ……………… ​3;…..h3O+ or OH- I got 4.6001 x 10-5...
Sunday, October 4, 2015 by patrick

chemistry
how many rb atoms could be placed on a square surface that is 1.0cm on a side? The diameter of a rb atom is 4.95
Sunday, October 4, 2015 by linda

Chemistry
Write the dissociation equation for iron(II) ammonium sulfate hexahydrate in water . Fe(NH4)2(SO4)2 * 6H2O --> __?________ I know dissociate means to take apart so for example; NaCl would look like Na^+ + Cl^- And another one like: Fe2(SO4)3 would look like 2Fe^+3 + 3SO4^-...
Sunday, October 4, 2015 by Christine

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