Tuesday
May 31, 2016

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Chemistry
List the grams of bleach solution necessary to provide 0.931g of NaClO(laundry bleach is 8.25% NaClO by weight) and the mL of bleach solution that contains the necessary amount... NaClO=74.442 g/mol. Need 0.931 grams of NaClO. Density of NaClO solution is 1.07 g/ml
Wednesday, February 10, 2016 by Niki

Chemistry
the actual yield of a reaction is 55.2g and the theoretical yield is 61.3g calculate the yield
Wednesday, February 10, 2016 by La Jon

Chemistry
The hydrogen gas is collected over water at 25.0°c. The volume of the gas is 246 ml measured at 760 mmhg. calculate the number of grams of h2 collected (vapor pressure of h2=23.76mmhg)
Wednesday, February 10, 2016 by Jocelyn

Chemistry
A gas has a volume of 500 mL at a temperature of -45.0°C. What volume will the gas occupy at 30.0°C? Show your work. What equation should I use for this one? Sorry but my allergies have me feeling drained. Where should i start on this one?
Tuesday, February 9, 2016 by bubble dragon

Chemistry
concentration of H30+ in 0.0250 moldm-3 aqueous epuation of HCL
Tuesday, February 9, 2016 by Archie

Chemistry
Two fixed charges, -4μC and -5μC, are separated by a certain distance. If the charges are separated by 20cm, what is the magnitude of the electric field halfway between the charges? My textbook says that the formula for electric field is (kq)/r^2. But Since I have ...
Tuesday, February 9, 2016 by Emma

Chemistry
If 1.6045g of anhydrous salt remains after heating 1.9045 g of CuC§¤2¡¤xH2O, determine the number of molecules of water of hydration in the original hydrate
Tuesday, February 9, 2016 by Addison

Chemistry
in a neutralization reaction, dilute tetraoxosulphate (vi) acid completely reacted with sodium hydroxide solution
Tuesday, February 9, 2016 by Archie

Chemistry
the ka value of 0.001moldm-3 solution of a weak acid is 1.6*10-6 calculate the ph and the pka
Tuesday, February 9, 2016 by Archie

chemistry
using the Kw for pure water, show that: pH = pKw - pOH
Tuesday, February 9, 2016 by william

AP CHEMISTRY
The equilibrium constant for the reaction PCl3(g) + Cl2(g) ⇀↽ PCl5(g) is 35000 at 760 ◦C. At equilibrium, the partial pressure of PCl5 was 150 bar and that of PCl3 was 8.12 bar. Calculate the equilibrium partial pressure of Cl2. Answer in units of bar. I got ...
Tuesday, February 9, 2016 by Lou

Chemistry
Calculate the mass of Na2C2O4 needed to react with 30mL of 0.050 M KMnO4. The net ionic equation is: 2MnO4- + 5C2O4-2 + 16H+ —> 2Mn+2 + 10CO2 + 8H2O I don't know where to start or how to end up with sodium oxalate. Thanks!
Tuesday, February 9, 2016 by Wayfinders

Chemistry 101
The mileage for a motorcycle with a fuel tank capacity of 22 liters is 35 miles per gallon. The density of gasoline is 0.74 g/cm^3.(dimensional analysis problem) a). How long a trip, in KM can be made on a full tank of gasoline? b). if the price of gasoline is $1.99 per gallon...
Tuesday, February 9, 2016 by Lilly

Chemistry 101
Joe Smith, the chemical engineer from Acme Chemical Company, wanted to determine the final volume in a large glass cylinder is he dropped a 12.52 pound ingot of lead whose density was 11.3 g/cm^3 into the cylinder which already contained 2500. mL of water. What is the final ...
Tuesday, February 9, 2016 by Lilly

Chemistry 101
A student using a 100mL graduated cylinder that contained 50.00mL of water. Th volume of the water increased to 57.50mL. The density of the object was 7.85 g/cm^2. How many grams did the metal object weigh?
Tuesday, February 9, 2016 by Lilly

Chemistry 101
A spherical bass has a diameter of 1.00 inch and a mass of 2.00 grams. Will the ball float or sink water? Remember that if the ball's density if greater than 1.00 g/mL the density of water, the ball will sink. Also remember to use dimensional analysis.
Tuesday, February 9, 2016 by Lilly

Chemistry
An aqueous solution of a molecular compkind freezes at -0.086 degrees Celsius. What is the molality of the solution?
Tuesday, February 9, 2016 by Dalli

chemistry
Predict how the compound Calcium Chloride would react to calcium nitrate, silver nitrate, Silver Nitrate + Ammonium Hydroxide,Silver Nitrate + Sodium Thiosulfate?
Tuesday, February 9, 2016 by jill

AP Chemistry
Determine the pH of an HF solution with a 4.70x10^-2M and 2.20x10^-2M. I tried this by looking up the Ka and putting it over molarity-ka squared. Am I doing something wrong? Can someone please show me the proper way to solve this problem?
Tuesday, February 9, 2016 by KC

Chemistry
Consider the following reaction. 2A(aq) (Two way arrows) B(aq) Kp = 5.48*10^-5 at 500K If a sample of A at 3.10atm is heated to 500K, what is the pressure of B at equilibrium? I know I need to do the ICE table, but am having trouble solving for x once I plug everything in. &...
Tuesday, February 9, 2016 by Ashtyn

Chemistry
For 2 SO2(g) + O2(g) equilibrium reaction arrow 2 SO3(g), Kp = 3.0 104 at 700 K. In a 2.00-L vessel the equilibrium mixture contains 1.21 g of SO3 and 0.183 g of O2. How many grams of SO2 are in the vessel?
Monday, February 8, 2016 by Jonathan Redd

chemistry
How many moles of chlorate ions, zinc ions, and oxygen atoms are present in 0.433 mol of zinc chlorate?
Monday, February 8, 2016 by Kaitlyn

Chemistry
How many moles of carbonate ions, aluminum ions, and oxygen atoms are present in 39.0 g aluminum carbonate?
Monday, February 8, 2016 by Kaitlyn

Chemistry
Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 2 L, the pressure is 1065 kPa (kilopascals). What is the pressure when the volume is 15 L ?
Monday, February 8, 2016 by Marie

chemistry
How the volume of the individual gas particles compared to the distance between each particle?
Monday, February 8, 2016 by Boberto

Chemistry
I have to calculate the heat capacity of a coffee cup calorimeter, but I'm not sure how. I have NaCl and NaOH, they both start at the same temperature, and I have the mass of the solutions used. I'd appreciate the help!
Monday, February 8, 2016 by Dan

chemistry
summarized the atomic structure and discovery of nucleus and protons
Monday, February 8, 2016 by lukman

Chemistry Dimensional analysis
A cyclist rides at an average speed of 18 miles per hour. if she wants to bike 212km, how long in hours must she ride? What I have so far.. 212km(10^3 miles
Sunday, February 7, 2016 by Joey

Chemistry
Calculate the mass of H2O that is produced from the combustion of 13.8 mol of C3H8n propane. C3H8 + 5O2---> 3CO2 + 4H2O known: 13.8mol C3H8 unknown: mass of H2O
Sunday, February 7, 2016 by A

Chemistry
to make a sodium chloride solution of the same molarity as household bleach (as determined in question 1) how many grams of salt would be needed for every 100 ml of solution question 1 answer: 0.871 M
Sunday, February 7, 2016 by Lola

Chemistry
Consider the thermal decomposition of potassium chlorate. 2 KClO3(s) ---> 2 KCl(s) + 3 O2(g) A mixture containing KCl and KClO3 weighing 1.80 g was heated producing 1.40 x 102 mL of O2 gas at STP. What percent of the original mixture was KClO3?
Sunday, February 7, 2016 by Ray

Chemistry
You are given a bottle of dry NaCl. Explain the procedures required to make 900mL of a 0.5M NaCl solution. The formula weight of NaCl is 58.4g/mole.
Sunday, February 7, 2016 by Ana

Chemistry
Construct a cooling curve (looks the same as a heating curve) for a substance with a molar mass of 200 that has a gas phase specific heat capacity of 2.9J/g K, a boiling point of 525 K,a liquid phase specific heat capacity of 3.24 J/g K, a freezing point of 352 K, a solid ...
Sunday, February 7, 2016 by Neveah

Chemistry
Calculate the pressure of the dry gas collected over water at 10 degree celcius and 750mmHg. Given that the vapour pressure of water at 10 degree celcius is 20mmHg
Sunday, February 7, 2016 by Dolapo

chemistry
25ml of 0.01M KIO3 solution were put to react with an excess of KI. 32.04ml of the sodium thiosulfate solution were needed to titrate the triiodide ions that were present . What is the molar concentration of thiosulfate in the solution?
Sunday, February 7, 2016 by vicky

organic chemistry
4. A 300-ml aqueous solution containing 40 g compound A is to be extracted with ether. The solubility of compound A in either at room temperature is 20 g per 100 ml and in water is 13.3 g per 100 ml. calculate the weight of the compound that would be recovered by extraction ...
Sunday, February 7, 2016 by em-em

chemistry
. In the following reaction: Fe2O3 + 3C → 2Fe + 3CO; how many grams of C are needed to react with 16.5 g Fe2O3?
Saturday, February 6, 2016 by john

chemistry
how do i decide which stationary phase to choose if solute i want to separate is relatively non-polar??
Saturday, February 6, 2016 by Anonymous

Chemistry
Equilibrium is established between Br2(l) and Br2(g) at 25.0*C. A 250.0 mL sample of the vapor weights 0.486g. What is the vapor pressure of bromine at 25.0*C, in mmHg?
Saturday, February 6, 2016 by Yvette

Chemistry
An aqueous solution is composed of 7.50 g NaCl (MM = 58.44 g/mol) diluted to 0.100 L. Calculate the osmotic pressure of the solution at 298 K a. 5.83 atm b. 9.22 atm c. 18.3 atm d. 62.8 atm
Saturday, February 6, 2016 by Kat

master chemistry
The rate constant of a chemical equation has increased from 0.100s^-1 to 2.70s^-1 upon raising the temperature from 25C to 45C. Find the activation energy. So far I done 3.30=(Ea/8.314)(-2.11x10^-4)
Saturday, February 6, 2016 by Jay

Chemistry
The vapor pressure of pure water at 10C is 9.2 torr. How many grams of MgCl2 would you need to add to 500 mL of water to drop the vapor pressure to 8.0?
Friday, February 5, 2016 by Andrew Smith

chemistry
I need help in the formula to calculate these types of problems 125ml of 0.43M of HCl + 17ml of 1.8M HCl Calculate the concentrations of solutions resulting from the mixture
Friday, February 5, 2016 by michelle

Chemistry
1,15g of a non-volatile compound is dissolved in 75,0g of benzene. The boiling point of the solution 0,125ºC has a value greater than the corresponding pure benzene. Calculate the molecular weight of the compound.
Friday, February 5, 2016 by Anonymous

Chemistry
Explain how conc. H2so4 catalysis the speed of the reaction between salicylic acid and acetic anhydride.
Friday, February 5, 2016 by Alki

Chemistry
Is the unbalanced reaction for copper + silver nitrate Cu + AgNO3 = Cu(NO3)2 + Ag or Cu + 2AgNO3 = Cu(NO3)2 + Ag?
Friday, February 5, 2016 by Anonymous

Chemistry
A Sample of M2O3 weighing 11.205g is converted to 15.380g of MCL3, where M is the unknown metal, then what is the identity of M?
Friday, February 5, 2016 by Justin

chemistry
What are the names of Calcium in its ionic form the relationship of that element, in its ionic form, with our health? I understand calcium chloride is ionic form of calcium but the others what are others that have a relationship with our health?
Friday, February 5, 2016 by Anonymous

general chemistry
mercury has density of 13.53 g/mL. what is the mass of 345mL of mercury? D=13.53g/mL Mass=345mL 13.53/345=0.039217391 i just do not think i am doing this right
Friday, February 5, 2016 by lisa

chemistry
what is the bond order of oxygen
Friday, February 5, 2016 by kidist

chemistry
what is the mass of an empty 75 mm test tube?
Friday, February 5, 2016 by anonymous

chemistry
A 7.30-L container holds a mixture of two gases at 45 °C. The partial pressures of gas A and gas B, respectively, are 0.410 atm and 0.620 atm. If 0.150 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?
Thursday, February 4, 2016 by grace

Chemistry
What is the principal of seperation of metal ions in qualitative analysis?
Thursday, February 4, 2016 by Ri

Chemistry
suppose 4.52 g H2o and 20.09 g So3 are produced. How many grams of H2So4 decompose? Wouldn't the answer be 24.61?
Thursday, February 4, 2016 by Anonymous

Chemistry
1. How could a chemistry student change NaOH(s) to NaOH(aq)? s= solid aq= aqueous 2.) How could a chemistry student change NaOH(s) to NaOH(l) s= solid l= liquid
Thursday, February 4, 2016 by Anonymous

chemistry
Let I know the equation with symbol of 'iron2oxide from iron fillings'
Thursday, February 4, 2016 by chaw

Social Studies
In what way is geography an integrative science? a. Geography is an integrative science because it examines Earth in both physical and human terms.*** b. Geography is an integrative science because it borrows from physical sciences such as chemistry, biology, meterology, and ...
Thursday, February 4, 2016 by Kaai97

Chemistry- Dr. Bob222
Methanol (CH3OH) is a colorless volatile liquid, formerly known as wood alcohol. It boils at 65.0 °C and has a heat of vaporization ΔHvap = 37.4 kJ/mol. What is methanol’s vapor pressure at 22.0 °C? My answer: 109.5 torr
Thursday, February 4, 2016 by Anonymous

English academy.chemistry
Complete the following reaction 2F2(g) +2H2O(ĺ)=?
Thursday, February 4, 2016 by Anonymous

Chemistry
2F2(g)+2H2O(l)=?
Thursday, February 4, 2016 by Mainu

Chemistry
Complete the reaction- 2F2(g)+2H2O(l)=?
Thursday, February 4, 2016 by Mainu

Chemistry
What happens to the pH of an acidic solution when it is heated
Thursday, February 4, 2016 by Anonymous

Chemistry
Is optimum ph for enzyme 7-14?
Thursday, February 4, 2016 by Ri

Chemistry
How many liters of nitrogen monoxide are produced when 15.0 L of water vapor are also produced (assume STP)
Thursday, February 4, 2016 by Levie

chemistry
1. Identify the strongest intermolecular forces present in each of the following: CH3CH2CH3 C6H5NH2 HF SO2 CH3CH2OH NF3 CH3Cl
Thursday, February 4, 2016 by edwin

chemistry
Give equations showing the commercial methods for preparing of the halogens (F2, Cl2, Br2, and I2).
Thursday, February 4, 2016 by John

College Chemistry
Oxygen has a Henry’s law constant of 1.3*10^-3 mol/kg*bar at 25 °C when dissolving in water. If the total pressure of gas ( gas plus water vapor) over water is 1.00 bar, what is the concentration of O2 in the water in grams per milliliter? (The vapor pressure of water...
Wednesday, February 3, 2016 by Pablo

chemistry
Choose the pair of substances that are most likely to form a homogeneous solution. N2O4 and NH4Cl C6H14 and C10H20 LiBr and C5H12 C6H14 and H2O None of the pairs above will form a homogeneous solution.
Wednesday, February 3, 2016 by reem

Chemistry
a. Calculate the expected freezing-point depression of a 0.200 m KNO3 solution. b. Will the value you calculated match the actual freezing-point depression for this solution? Why or why not? a). -0.372 degrees Celsius b). Possibly because not all of the substance ionizes 100% ...
Wednesday, February 3, 2016 by Drew

Chemistry
If 2.43 grams of aluminum react with excess CuSO4, What is the theoretic yeild of Cu? And then Use the Actucal amount of Cu formed to find percent yield.You have 0.92 mass of copper metal product. 2Al + 3CuSO4 ---> Al2(SO4)3 + 3Cu 2.43 / 27 = 0.09 moles of al 0.09 x 3 / 2 x...
Wednesday, February 3, 2016 by Boberto

Chemistry
Explain in words what is happening in the reaction between copper and silver nitrate.
Wednesday, February 3, 2016 by Anonymous

Chemistry
In a sample of 100 liters of air a city's 2x10^-8 L of the pollutant SO2. How many ppm by volume ?
Wednesday, February 3, 2016 by Sara

chemistry
Propane is used in BBQs and burns according to the following equation: C3H8 + 5O2 -> 3CO2 + 4H2O. If 2.2 moles of carbon dioxide are produced, how many moles of oxygen gas reacted?
Wednesday, February 3, 2016 by Melanie

chemistry
Using the following equation 2C2H2 + 5O2 -> 4CO2 + 2H2O what volume of oxygen would be needed to react with 89.6L of C2H2 at a temp of 273 and a pressure of 101.3 kpa. I can't seem to figure out my first step. Using PV=NRT should I do initial and final conditions? I ...
Wednesday, February 3, 2016 by danielle

chemistry
For the reaction N2(g) + 3H2(g) 2NH3(g), what will happen if more ammonia gas is added?
Wednesday, February 3, 2016 by aaron

Chemistry
which element in the first transition series do not exhibit variation of oxidation state and why?
Wednesday, February 3, 2016 by Ri

Chemistry
in paramagnetic ions all the bonds formed between Mn and O are covalent,why?
Wednesday, February 3, 2016 by Minhye

Chemistry
Why is radius of Fe2+ less than that of Mn2+ ?
Wednesday, February 3, 2016 by Minhye

Chemistry
Why do argon and flourine not form compounds like Xenon Flourides?
Wednesday, February 3, 2016 by Minhye

chemistry
hcl + naoh ==> h2o + nacl limiting reagant
Wednesday, February 3, 2016 by Anonymous

Chemistry
A 1.0 mL volume of 0.010 M H2SO4 is added to a mixture of 6 drops of 0.010 M HIO3, 14 drops of deionized water, and 1 drop of starch solution. A color change in the reaction mixture occurred after 56 seconds. a. Assuming 20 drops per milliliter for all solutions, determine the...
Tuesday, February 2, 2016 by Aly

Chemistry
In interhalogen compounds of the type Ab5 and AB7, B is invariably flourine,why ?
Tuesday, February 2, 2016 by Minhye

AP Chemistry
What is a molecular dipole moment? A. The arrangement of charge around an atom in a nonpolar molecule B. A net cancellation of charge separation due to symmetry of the molecule C. A separation of charge characterizing a nonpolar covalent molecule D. A separation of charge ...
Tuesday, February 2, 2016 by FIFI

chemistry
He has narrowed the identity of his unknown to either molecule X, molecule Y, or molecule Z. The Merck Index tells him that all three molecules produce white, needle-like crystals from ethanol. How might he definitively identify his unknown molecule?
Tuesday, February 2, 2016 by Sean

Chemistry
7.5 L of hydrogen gas at STP and zinc (II) nitrate was produced by reacting zinc with nitric acid. Calculate the mass of zinc needed for this reaction. This is what I did: Zn + 2HNO3 = H2 + Zn(NO3)2. 7.5L H2 * 1 mole H2/ 22.4 L H2 * 1 mole Zn/ 1 mole H2 * 65.4 g Zn / 1 mole Zn...
Tuesday, February 2, 2016 by Anna Diaz

Chemistry
Kc = 28 at some temperature for the reaction H2(g) + I2(g) ⇀↽ 2 HI(g). If 16.7 moles of HI are introduced into a 10.0 liter vessel, how many moles of I2 are present at equilibrium? Answer in units of mol.
Tuesday, February 2, 2016 by Katie

Chemistry
The heat of vaporization of water is 9.73 kcal/mol. At what pressure (in torr) would pure water boil at 89◦C?
Tuesday, February 2, 2016 by Katie

chemistry
Crushing Can: youtube video: /watch?v=SBpqT-u8sjo 1. Explain why the can collapsed using the Combined Gas Law where T1 is the initial temperature of the air inside the can before the can was inverted and T2 is the temperature of the air inside the can after it was plunged into...
Tuesday, February 2, 2016 by help me please! :\

Chemistry
Using calculations, determine how you would make a 525 ml pg a 0.50 M solution of Cl- ions using CaCl2. I am unsure how to do this question, I was going to use C1V1=C2V2 but with this I would be missing the first part of the equation. If that is the case, would I assume the ...
Tuesday, February 2, 2016 by Heather

chemistry
How many moles of carbon dioxide will be created by the complete combustion of 2.25 moles of ethane?
Tuesday, February 2, 2016 by caleb

Chemistry
The National Vaccine Information Center estimates that 90% of Americans have had chickenpox by the time they reach adulthood. We now consider a random sample of 120 American adults: a) Would you be surprised if there were 105 people who have had chickenpox in their childhood? ...
Monday, February 1, 2016 by Anonymous

Chemistry
Assume the reaction of 55.25 g of Ge in the following reaction to determine the other quantities. 3Ge + 2N2 -> 1Ge3N4
Monday, February 1, 2016 by Kaitlyn

Chemistry
The elements 57 through 71 (Lanthanum and the Lanthanoids) all form Ln+3 ions in aqueous solution. These all have an electron configuration is [Xe]4fn, where n increases from zero to fourteen over the series from Lanthanum to Lutetium Select the two ions that have 4 unpaired ...
Monday, February 1, 2016 by Kaitlyn

chemistry
Crushing Can: youtube video: /watch?v=SBpqT-u8sjo 1. Explain why the can collapsed using the Combined Gas Law where T1 is the initial temperature of the air inside the can before the can was inverted and T2 is the temperature of the air inside the can after it was plunged into...
Monday, February 1, 2016 by help me please! :\

Chemistry
Answer the following questions using this balanced chemical equation. 2C3H6+9O2+6H2O How many grams of C3H6 are needed to produce 4.2 mol of H2O?
Monday, February 1, 2016 by Alana

chemistry
A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressu of the three gases in the tank are 5 atm of O2, 900 mm Hg of N2, and 1.4 kPa of He what total pressure inside of the tank?
Monday, February 1, 2016 by karen

Chemistry
Write a balanced equation for the following reaction. Use whole number coefficients and subscripts as appropriate. Carbon tetrachloride is an industrial liquid solvent. It is made by combining methane gas with elemental chlorine. These react to form carbon tetrachloride and ...
Monday, February 1, 2016 by Mike

Chemistry
A 1" x 1" 1/8" copper ingot has a density of 8.94 g/mL. 25 pellets were obtained from the ingot. Explain what would be the density of each pellet. I went ahead and found the mass of the ingot which is 1.1175g but I'm still stumped on what to do from there.
Monday, February 1, 2016 by Joe

chemistry
Write a balanced equation for the following reaction. Use whole number coefficients and subscripts appropriately. When hydrochloric acid is mixed with sodium hydrogen carbonate, the mixture fizzes. The fizzing occurs because the reaction produces a gas, namely carbon dioxide. ...
Monday, February 1, 2016 by Mike

chemistry
What is law of mass action
Monday, February 1, 2016 by Mukesh shankopal(koli)

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Homework Help: Science