Thursday
July 2, 2015

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry-is this right?
Water has a pH of 4.9? Calculate H3O and OH 1. H3O= 10^4.9=1.25*10^-5 2. OH= 14- 4.9= 9.1
Thursday, April 30, 2015 by Clare

chemistry
How to calcuate therotical pH 1.) 0.1 M HCl measured pH=1 2.) 0.1 M NaOH measured pH=13?
Thursday, April 30, 2015 by Clare

Chemistry
To titrate the acetic acid in 10.0 mL of vinegar sample, 25.5mL of 0.5M sodium hydroxide solution is needed. What is the concentration of acetic acid in the vinegar?
Thursday, April 30, 2015 by Anonymous

Chemistry
20.00mL of 0.55M CH3COOH solution is mixed with 9.95mL of 1.0M NaHCO3 solution. The reaction occurring is CH3COOH + NaHCO3 --> CH3CHOO + Na + H2O +CO2. Which is the limiting reagent in this reaction?
Thursday, April 30, 2015 by Kate

Chemistry Dr. Bob
I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
Thursday, April 30, 2015 by Jennie

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Thursday, April 30, 2015 by kim

Chemistry
I need help on my chem lab... I need to give you background info so you know how to help me.. Data Sheet: Specific gravity of distilled water Temp of distilled water = 20 C Specific gravity: 1.0000 or 1.000 (according to hydrometer used) sugar solution 1 : mass 18.01 g volume ...
Thursday, April 30, 2015 by Jennie

chemistry
CH4 (g) + 2 O2 (g) --> CO2 (g) + 2 H2O (g), (triangle)H rxn =-802.3 kj How much heat is produced by the complete combustion of 237 g of CH4?
Wednesday, April 29, 2015 by Kim

chemistry
I posted my specific heat wrong. Now, how many joules is required to change temp of 225 g of lead from 5.0*C. specific heat of lead is 0.129J/g*C. I came up with 5805. It just doesnt look correct. Please help
Wednesday, April 29, 2015 by kimberly

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Wednesday, April 29, 2015 by kim

chemistry
How many joules is required to change the temp of 225 g of lead from 5.0*C to 25*C. specific heat of lead is 0.139J/g*C. I came up with 5805 and it just doesn't look right.
Wednesday, April 29, 2015 by kimberly

chemistry
Write the balanced net ionic equation for the following reaction and determine the conjugate acid-base pairs. HNO3(aq)+Li2CO3(aq)<--->LiNo3(aq)+​LiHCO3(aq) Which component in the net ionic equation is the acid, the base, the conjugate base, and the conjugate acid ...
Wednesday, April 29, 2015 by kim

Chemistry
H2S+H2O<-> H3O +HS why THIS BUFFER SOLUTION IS ABLE TO RESIST CHANGE IN PH WHEN SMALL AMOUNTS OF OH ARE ADDED TO IT.
Wednesday, April 29, 2015 by Clare

Chemistry
Describe how you would prepare 250.0 mL of a 0.1500 M NaCl solution given that the NaCl is supplied as a solid. Describe how you would prepare 1.25 L of a 0.025 M sucrose solution from a stock solution with concentration of 5.00 M. What is the benefit of adding salt to water ...
Wednesday, April 29, 2015 by Caitie

Chemistry-is this right?
pH: 4.9 Calculate: H3O H30= 10^-pH H3O=10^-4.9 H30=1.25 * 10^-4 AND CALCULATE OH=14-pH OH=14-4.9 OH= 9.1
Wednesday, April 29, 2015 by Clare

Chemistry
Solarcaine aerosol spray is used for temporarily relieving pain as it works as a topical anesthetic numbing the skin. Solarcaine is in fact benzocaine, C9H11NO2 with molar mass 165.2 g/mol. If a 100.0 mL spray can contains 1.00 g of benzocaine, calculate the pressure within ...
Wednesday, April 29, 2015 by Caitie

Chemistry
Liquid vitamin C, (ascorbic acid) C6H8O6 , readily reacts with atmospheric oxygen, O2, to form liquid dehydroascorbic acid, C6H6O6 and water. Explain why this is a chemical reaction. Write a balanced equation for this reaction. How many mole of oxygen gas is required to react ...
Wednesday, April 29, 2015 by Caitie

Chemistry
C6H12O6 (aq) = 602 (g) - 6CO2 (g) = 6H20 (l) H -2837 A)Exo or endothermic? B)write an expression for the equilibrium constant C)Give the value of the equilibrium constant is very large, would this reaction be fast or slow? D)effects of equilibrium if.. i. incerasing temp ii. ...
Wednesday, April 29, 2015 by Caitie

Chemistry
Calculate the pH of the resulting solution if 50 cm3 of 0.045mol dm-3 solution of C5H5N is mixed with 100 cm3 of 0.035 mol dm-3 of C5H5NH+
Wednesday, April 29, 2015 by Morgan

Chemistry
Based on the following balanced equation: 2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O a. How many moles of CO2 are produced after complete reaction of 8.00 moles of C4H10? b. How many grams of CO2 are produced after complete reaction of 8.00 moles of C4H10? c. How many moles of H2O ...
Wednesday, April 29, 2015 by Anonymous

Chemistry
Based on the following balanced equation: 2 NH3 + 2 O2 -->N2O + 3 H2O a. How many moles of O2 are required to react completely with 6.00 moles of NH3? b. How many grams of O2 are required to react completely with 6.00 moles of NH3? c. How many moles of H2O are produced ...
Wednesday, April 29, 2015 by Anonymous

chemistry
Solution equals 0.015 M HCl Find OH Find pH Isn't pH=1.8? I don't know how to find OH :( Is there a formula or do subtract 14-1.8? I'm confused and I got this assignment today yet we haven't gone over anything yet.
Wednesday, April 29, 2015 by Clare

Chemistry-is this correct?
Calculate the pH and identify as acidic, basic,or neutral 1. H= 1.10 * 10^-11 M Answer: pH=11, basic 2. H= 2.61 * 10^-2 M Answer: pH:1.58, acidic 3. OH= 4.0 * 10^-9 M pH: 8.39, basic
Wednesday, April 29, 2015 by Clare

chemistry
the acid dissociation constant of dichloroethanoic acid is 0.033 . calculate the concentrations of hydrogen ions
Wednesday, April 29, 2015 by Anonymous

Chemistry
Calculate OH and H pH= 12 How to set this up
Wednesday, April 29, 2015 by Clare

Chemistry- is this right?
Calculate the H+ of 0.1 M NaOH Calculate the pH of 0.1 M NaOH [H+]=10^ph [H+]=10^-13 [H+]=1*10^-13M Since pH+ pOH=14 pH= -log (0.1M) pH=1 so 14-1 pH= 13
Wednesday, April 29, 2015 by Clare

Chemistry
Calculate the H+ for number #2 #2 : H+ = 10^-2, with a pH of 2 Not sure how to calculate H+
Wednesday, April 29, 2015 by Clare

Chemistry
A standard of red dye was prepared in the following manner: 4.5mL of 0.100M of food dye was added to a test tube and 5.5mL of water was added. What was the final concentration of food dye in the test tube?
Wednesday, April 29, 2015 by Kate

Chemistry
66.9 g of a substance X dissolves in enough water to make 0.428 L of a 0.68 M solution. Calculate the molar mass of X in g/mol.
Wednesday, April 29, 2015 by Devin

Chemistry
A 0.885 M solution of sulfuric acid (H2SO4) is to be reacted with a 0.552 M solution of sodium hydroxide to make sodium sulfate and water. How many L of the H2SO4 solution will react with 0.842 L of the NaOH solution? Give your answer to 3 decimal places.
Wednesday, April 29, 2015 by Devin

CHEMISTRY
When one mole of C6H6 is burned, 3.27 MJ of heat is produced. When the heat from burning 5.35 g of C6H6 is added to 5.69 kg of water at 21.0°C, what is the final temperature of the water?
Wednesday, April 29, 2015 by torri

Chemistry
Carbon monoxide and hydrogen react according to the equation: CO(g) + 3H2(g) CH4(g) + H2O When 1.00 mol CO and 3.00 mol H2 are placed in a 1L flask at 1200K and allowed to come to equilibrium, the reaction mixture is found to contain 0.387 mol H2O. What is the molar ...
Wednesday, April 29, 2015 by Emily

chemistry
Table of enthalpy of solution for selected cesium salts Compound and ΔsolH kJ mol-1: - Cesium bromide: 25.98 - Cesium iodide: 33.35 - Cesium chloride: 17.78 - Cesium fluoride monohydrate: -10.46 - Cesium fluoride sesquihydrate (·1.5H2O): -5.44 Data taken from CRC ...
Wednesday, April 29, 2015 by john

chemistry
Calculate the freezing point of 1molar aqueous solution (density =1.04g) of kcl (kf for water =1.86)K=39,cl=35.5
Wednesday, April 29, 2015 by shubham

Chemistry
Calculate the pH of the resulting solution if 50 cm3 of 0.045mol dm-3 solution of C5H5N is mixed with 100 cm3 of 0.035 mol dm-3 of C5H5NH+
Wednesday, April 29, 2015 by Morgan

chemistry
Calculate the concentrations of all ions after 50.0 mL of a 0.100 M AgNO3 solution is mixed with 100.0 mL of a 1.00 M Na2SO4 solution.For Ag2SO4 Ksp = 1.2 x 10-5 Do I first do MiVi=MfVf and then using the two concentrations I use ksp value? I'm just so confused.
Wednesday, April 29, 2015 by Anon

Chemistry
Sulfur trioxide decomposes into sulfur dioxide and oxygen in an equilibrium. You have a 3.00 L vessel that is charged with 0.755 mol of SO3. At equilibrium, the amount of SO3 is 0.250 mol. 2 SO3 (g) ----> 2 SO2 (g) +O2 (g) A) calculate the equilibrium concentrations of SO2 ...
Tuesday, April 28, 2015 by Ashley

Chemistry
A sample of krypton gas occupies 95.0 mL at 0.500 atm. If the temperature remained constant, what volume would the krypton occupy at (a) 5.00 atm, (b) 0.0500 atm, (c) 555 torr, (d) 5.00 torr, and (e) 5.5 3 1022 torr?
Tuesday, April 28, 2015 by Alicia

Chemistry
Determine the energy absorbed as two moles of Nitrosyl Chloride are disassociated into nitric oxide and chlorine gas (used bond energies of kJ per mole to determine your net energy released in Joules): 2NOC1(g)-->2NO(g)+C12
Tuesday, April 28, 2015 by Sam

Chemistry
Determine the energy absorbed as two moles of Nitrosyl Chloride are disassociated into nitric oxide and chlorine gas (used bond energies of kJ per mole to determine your net energy released in Joules): 2NOC1(g)-->2NO(g)+C12
Tuesday, April 28, 2015 by Sam

Food Chemistry
A new food colorant has a molar absorptivity of 3.8x 10^3 cm^-1M^-1 at 510 nm: (1) what will be the absorbance of a 2X10^-4 M solution in a 1 cm cuvette determined at 510 nm; (2) what will be the percent transmittance (T%) of the solution in (1) in this case
Tuesday, April 28, 2015 by knolan

chemistry
is the reaction between Copper sulfate and zn exothermic or endothermic and does that involve the activity series?
Tuesday, April 28, 2015 by johnny

Chemistry
A 1X Phosphate Buffered Saline solution was prepared by adding 1.44g of Na2HPO4 and 1.44g of H2PO4- to 800mL of water. Additional components were dissolved in the solution: 8g of NaCl, 0.2g of KCl and 0.24g KH2PO4. The resulting buffer solution had a pH of 7.2. a. Calculate ...
Tuesday, April 28, 2015 by Nicole

Chemistry
In a basic solution how does the concentration of H3O+ compare to concentration of OH-?
Tuesday, April 28, 2015 by Anonymous

chemistry
Lithium chlorate is decomposed with heat to give lithium chloride and oxygen gas. If 2.23g of lithium chlorate is decomposed, how many milliliters of oxygen are released at stp?
Tuesday, April 28, 2015 by kimberly

Chemistry
How does a pH of a buffer solution go outside of its range?
Tuesday, April 28, 2015 by Avery

chemistry
Calculate the approximate pH of a 0.1 M solution of ethanoic acid at 298 K, given that the dissociation constant, Ka, is 1.75 x 10-5 mol/L at 298 K.Ethanoic acid dissociates in aqueous solution as follows: CH3COOH(aq) + H2O H3O+(aq) + CH3COO-(aq)
Tuesday, April 28, 2015 by Emily

Chemistry
Cobalt and nickel can be simultaneously determined by formation of their coloured complexes with 8-quinolinol in solution. Molar extinction coefficients are: εCo = 3529, and εNi = 3228 cm-1 M-1 at 365 nm; and εCo = 428.9 and εNi = 0 cm-1 M-1 at 700 nm. ...
Tuesday, April 28, 2015 by FilthyF

analytical chemistry
What weight of potassium acid phthalate(KHC8H4O4) is required to react with 25 ml OF 0.5N NaOH solution
Tuesday, April 28, 2015 by jeslf

Chemistry
In which condition(s) can I get this reaction: Fe + H2SO4 = Fe2(SO4)3 + H2
Tuesday, April 28, 2015 by Keal

chemistry
the wavelength(nm)of a ball bearing with a mass of 10g, and a velocity of 10cm/s is what?
Tuesday, April 28, 2015 by Fernando

Chemistry
How many moles of ammonium nitrate is created from 10.7 grams of ammonium nitrate? Thus how many grams of ammonium nitrate is needed to make exactly one mole of ammonium nitrate?
Monday, April 27, 2015 by E'Manuel

Chemistry
What is the molality of a solution of aluminum nitrate that contains 77.0 g of Al(NO3)3 dissolved in 120.0 g of water? Use molar masses with at least as many significant figures as the data given.
Monday, April 27, 2015 by Heather

Chemistry
The soda was found to have a sugar concentration of 9.6% (wt./vol.). How many teaspoons of sugar are in a can of soda? (One can is 12fl.oz or 355mL) (1 teaspoon is approx. 4g)
Monday, April 27, 2015 by Carrie

Chemistry
When aqueous solutions of lead(II) ion are treated with potassium chromate solution, a bright yellow precipitate of lead(II) chromate, PbCrO4, forms. How many grams of lead chromate form when a 1.60-g sample of Pb(NO3)2 is added to 24.0 mL of 1.01 M K2CrO4 solution?
Monday, April 27, 2015 by Jamie lee

chemistry
An atom whose nucleus contains 7 neutrons and which has a mass number of 12 is an isotope of what element?
Monday, April 27, 2015 by danny

chemistry
What is the approximate effective nuclear charge for arsenic ?
Monday, April 27, 2015 by danny

chemistry
q4 What element has the greatest first ionization energy? Li Na K Rb Cs
Monday, April 27, 2015 by danny

Chemistry
How much SO2 is needed to saturate 50g of H2O at 5 degrees Celsius
Monday, April 27, 2015 by Sophia

chemistry
A 3.50L sample of neon gas has a pressure of 0.950 atm at 20 degrees C. What would the volume be if the pressure increased to 1.50 atm and the temperature remained constant?
Monday, April 27, 2015 by sun

Organic chemistry
Help with prediction products of a reaction! 4-phenylbutanoyl chloride + AlCl3 --> ? the molecular formula of the product is C10H10O, and I need to determine the product. I was thinking an acylium ion would form, and then the carbonyl carbon would form a bond with the ring ...
Monday, April 27, 2015 by anonymous

chemistry
A sample of potassium hydrogen oxalate, KHC2O4, weighing 0.717 g, was dissolved in water and titrated with 18.47 mL of an NaOH solution. Calculate the molarity of the NaOH solution.
Monday, April 27, 2015 by mary

Analytical Chemistry
Any help/advice on answering this question would be a big help! :) The analysis of lead (Pb) in a sample of solder was carried out using atomic absorption spectroscopy as follows. 1.013 g of solder was completely dissolved in a small volume of nitric acid and the solution made...
Monday, April 27, 2015 by Chris

Chemistry
Calcium hydroxide has Ksp = 5.5 x 10-5 at 25 oC and a molar mass of 74.10 g/mol. How many grams of calcium hydroxide are needed to create 365 mL of a saturated solution of calcium hydroxide at 25 oC?
Monday, April 27, 2015 by Molly

Chemistry
The radioactive nuclide 18F decays by first order kinetics with a half life of 1.83 hr. How many hours will it take for 68.5% of a give quantity of 18F to decay?
Monday, April 27, 2015 by Molly

Chemistry
20.0 mL of a 0.18 M HCl solution are combined with 50.0 mL of a 0.085 M NaOH solution. What is the pH of the resulting solution?
Monday, April 27, 2015 by Molly

chemistry
Can aluminum (Al) react with K2SO4 by single replacement to yield products? Using the activity series chart, I know that K is more reactive than Al so does that mean that a reaction will occur or not?
Monday, April 27, 2015 by Ally

chemistry
Which way will the equilibrium shift when subjected to the following changes? 2NOBr + heat <-> 2NO +Br2? NO is addded temp. doubled Br2 removed Pressure increased I said: reverse, forward, forward, forward
Monday, April 27, 2015 by Clare

Chemistry
Hi, Iodine has 53 electrons and configuration of: 2, 8, 18, 18, 7. Why does the fourth shell not reach maximum and therefore it picks up 7 electrons and begins a new shell. Thank you.
Monday, April 27, 2015 by Steph

Chemistry
A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25-g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at -4.00°C. Which of these choices is its molecular formula?
Monday, April 27, 2015 by Confuse

Chemistry
A 0.642 g sample of an unknown gas was collected over water at 25 C and 1.04 atm. The collection cylinder contained 151.3 mL of gas after the sample was released. Find the molar mass of the unknown gas?
Monday, April 27, 2015 by Anonymous

Chemistry
Samples of NH3 and 02 are placed in a rigid container. When the equilibrium below is established, the partial pressure of H2O is 0.784 atm. What is the partial erasure of NO when the system is at equilibrium? 4NH3 + 5O2 -----> 4NO + 6H2O
Monday, April 27, 2015 by Anonymous

chemistry
Suppose that a student performing this experiment recorded the concentration of NaOH solution as 0.513 M, instead of the correct value of 0.531 M. Assuming there were no other errors, would each of the following experimental results be high, low, or unaffected by the error? ...
Sunday, April 26, 2015 by kales

chemistry
please help !!! You are given an organic solid which reacts with most organic solvents. How would you obtain the IR spectrum of it?
Sunday, April 26, 2015 by katherine

Chemistry
Calculate the energy in Joules, of a photon of blue light have a frequency of 5.0 x 10^14 hertz. E=hv v=C/ƛ v= 3.00x10^8/5.0x10^14= 6x10^-7 E=(6.626x10^-34) (6x10^-7)= 3.9x10^40 Joules What am I doing wrong? I got this wrong on my exam and have a final tomorrow, so any ...
Sunday, April 26, 2015 by Stacie

chemistry
You are given an organic solution which reacts with most organic solvents. how would you obtain the IR spectrum of it?
Sunday, April 26, 2015 by Maria

chemistry
What is the pH of a 0.2 M solution of pyridinium chloride (C5H5NHCl)? Kb for pyridine (C5H5N) is 1.5 × 10−9 . 1. 8.824 2. 2.788 3. 4.761 4. 3.068 5. 3.308 6. 2.698 7. 2.938 8. 5.176 9. 9.239
Sunday, April 26, 2015 by Anonymous

chemistry
Arrange the acids I) hydrogen selenate ion (HSeO− 4 ), pKa = 1.92; II) phosphoric acid (H3PO4), pKa = 2.12; III) selenous acid (H2SeO3), pKa = 2.46; IV) phosphorous acid (H3PO3), pKa1 = 2.00; in increasing order of strengths. 1. I, III, II, IV 2. None of these 3. I, III...
Sunday, April 26, 2015 by Anonymous

chemistry
Which of the following 0.10 M aqueous solutions gives the LOWEST pH? 1. CH3COOH (pKa = 4.75) 2. CCl3COOH (pKa = 0.52) 3. HF (pKa = 3.45) 4. H3PO4 (pKa1 = 2.12) 5. Because all are acids, the pH is the same for all solutions
Sunday, April 26, 2015 by Anonymous

Chemistry
Why does AgCl dissolve in NH3 but AgBr and AgI don't? KSP of AgCl = 1.8 x 10-10 KSP of AgBr = 5.0×10–13 KSP of AgI = 1.5 x 10-16
Sunday, April 26, 2015 by Serena

chemistry
A 32.5 g sample of K2SO4 is dissolved in a quantity of water and stirred well. A 40.00 mL sample of the solution is evaporated to dryness and leaves behind 5.00 g of solid K2SO4.what is the molarity. Calculate molar masses of solutes to .01 grams
Sunday, April 26, 2015 by mark

chemistry
what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?
Sunday, April 26, 2015 by jk

AP chemistry
what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?
Sunday, April 26, 2015 by jk

pre ap chemistry
you will need to explain in detail how to make 100.0 ml of a 0.500M CUSO4.5H20(s) SOLUTION. BE SPECIFIC about the measurements you would make and the type of equipment you will use . write out steps
Sunday, April 26, 2015 by nissa

chemistry
If 5.0 mL of 0.12 mmol dm-3 MB solution is diluted by adding 20.0 mL of 0.2 mol dm-3 HCl to it, what is the new MB concentration?
Sunday, April 26, 2015 by Mara

chemistry
what products would form after hydrogenation of 2-methyl-1-butene? after halogenation (cl2)?
Sunday, April 26, 2015 by jk

Chemistry
I need help, I don't know how to approach this question The free energy generated by ion movement in the cell is used by the cell to do work. Compute the minimum number of millimoles of sodium that would be needed to pump one millimole of calcium ions if the following ...
Sunday, April 26, 2015 by Ann

Chemistry 2
Does the reaction P4(s, white) + 5 O2(g) P4O10(s) occur spontaneously at 298 K and standard state conditions? Calculate the value of capital delta S°univ. Honestly do not know where to start.
Sunday, April 26, 2015 by Anonymous

chemistry
Can anyone help me with this question. Propose a method in detail to determine the concentration of two components, quinine and anthracene in a mixture using fluorimetry. You have access to pure sulutes and an appropriate solvent. The excitation and emission spectra of quinine...
Sunday, April 26, 2015 by Briam

CHemistry
Given the following information calculate the heat of formation of C2H4. C2H4 + 3 O2 ¡æ 2 CO2 + 2 H2O ¥ÄH¡Æ = -414 kJ/mol C + O2 ¡æ CO2 ¥ÄH¡Æ = -393.5 kJ/mol H2 + ¨ö O2 ¡æ H2O ¥ÄH&...
Sunday, April 26, 2015 by sam

chemistry
Hess¡¯ law says that when we add reactions together we can also add the enthalpies. Given the following set of reactions, use Hess¡¯ Law to calculate the enthalpy of the reaction given below. N2H4 + H2 ¡æ 2 NH3 ¥ÄH¡Æ = ? ...
Sunday, April 26, 2015 by jhon

analytical chemistry
Consider a general reaction where a ligand L and a metal ion Mn+ form a complex with m number of ligands (L) coordinated to each metal ions. Assume the metal is colorless. The ligand and metal solutions were mixed at molar fractions (and same total molar concentration). The ...
Saturday, April 25, 2015 by Katy

Chemistry 2
For the gaseous reaction of carbon monoxide and chlorine to form phosgene, (COCl2), calculate each of the following. (a) Calculate S° at 298 K I got -136.76 J/K using delta S = sum of delta S of products minus sum of delta S of reactants which is the right answer. But I ...
Saturday, April 25, 2015 by Anonymous

Chemistry
Need some direction.. where do I start? Vinegar is a 5% (mass/mass) solution of acetic acid in water. If vinegar has a density of 1.06 g/mL, what is the concentration in molar?
Saturday, April 25, 2015 by Mike

CHEMISTRY
question 1.Explain why fructose and alpha-hydroxyketose reacts with benediict’s solution. what structural arrangement is necessary for the reaction to occur? question 2. When aldose react with Barfoed reagent what type of organic compound forms. What type of chemical ...
Saturday, April 25, 2015 by SHALOM

chemistry
For the following chemical reaction, how many moles of silver iodide (AgI) will be produced from 4 mol of calcium iodide (CaI2)?
Friday, April 24, 2015 by chelsea

chemistry
In a 1.00 L container at 272 degrees C 1.3 mol of N2 and 1.65 mol of H2 are added at equilibrium 0.100 mol NH3 is present calculate the equilibrium concentrations of N2 and H2 2NH3(g)<-->N2(g)+3H2(g)
Friday, April 24, 2015 by kim

Chemistry
I have water pH 7.0 insulation with various other things that do not affect pH, I am trying to add X amount of HCL to lower the solution to a pH of 1.5 I know pH=-log[HCl] but I'm not sure how to approach this problem, after this I am then trying to add NaOH to return the ...
Friday, April 24, 2015 by Margaret

Chemistry
What is name of this according to the IUPAC: a benzene that has an ethyl group on an its carbon , and a double methyl group on another carbon ? thanks
Friday, April 24, 2015 by Mad

chemistry
A mixture is made using A 50.0 mL sample of a 0.20 M aqueous solution of NAOH was added to 50.0 mL of a 0.20 M aqueous solution of HCl.What is its pH at 25.0 °C?
Friday, April 24, 2015 by aireen

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