CHEMISTRY (WEBWORK)

58,662 results, page 100

Chemistry

Calculate the pH at 298K of solutions having the following ion concentrations? A. [H+]=1.0 x 10^-4M B. [H+]=5.8 X 10^-11M for A do you subtract 1.0 X 10^-14 from H+]=1.0 x 10^-4M

Chemistry

CO(h20)6 2+ + 4Cl- <=> CoCl4 2- + 6H20 What would AgNO3 do when added to this? What is the equilibrium expression?

Chemistry

CO(h20)6 2+ + 4Cl- <=> CoCl4 2- + 6H20 What would AgNO3 do when added to this? What is the equilibrium expression?

Chemistry

What is the wavelength of radiation that has a frequency of 5.8 X 10^12 s-1? I keep getting 5.17e19 but it keeps saying that's wrong. Help!

Chemistry

How many kilograms of red iron oxide can be obtained from 1.00kg ferrous sulfate heptahydrate?

Chemistry

Complete and balance this equation for a combination reaction. Be + O2 ==> Would it be Be + O2 ==> BeO2 ? or... 2Be + O2 ==> 2BeO ? Why??

Chemistry

2NaHCO3 + H2SO4 ->Na2SO4 + 2H2O + 2CO2 Can u tell me physical states of the equation?

Chemistry

C9H20 + 19/2O2 -> 9CO2 + 10H2O Please Can u find the physical states for this equation?

Chemistry

Write a balanced chemical equation for each single replacement reaction. A) Au(s) + KNO3(aq) ==> ??? B) Al(s) + H2SO4(aq) ==> ???

Chemistry

What volume of 0.025 M sodium bromide, NaBr, contains 2.0 ´ 10-4 mole of Br-? a. 0.040 L b. 0.080 L c. 4.0 mL d. 8.0 mL e. 16 mL

Chemistry

If PbF2 is poured into a solution of 0.012 molar F-, how much will dissolve at equilibrium?

Chemistry

How many moles of air are there in flask with a volume of 125mL if the pressure is 745 mm Hg and the temperature is 22 celcius ?

chemistry

identify the atoms that are being oxidized and reduced.. 2FeCl3 + 2KI --> 2FeCl2 + 2KCl + I2

chemistry!

how many moles of product are formed in the reaction? 2Al(s),3Cl2(g)--->2AlCl3(s) please help me!! thank you so much

chemistry

How many joules of heat would be required to completely melt 5.00 grams of H2O (s) at 0C to H20 (l) at 0C

Chemistry

how much heat is required to vaporize 343 g of liquid ethanol at its boiling point?

Chemistry

How can you tell if [ MnCl6]4- or [ Mn(CN)6 ] 4- has the longer wavelength of light? and then how do you figure out how many unpaired electrons each has?

Chemistry

How can you tell if [ MnCl6]4- or [ Mn(CN)6 ] 4- has the longer wavelength of light? and then how do you figure out how many unpaired electrons each has?

Chemistry

The Ka values of H3PO4 are shown below. Ka1 7.5 10-3 Ka2 6.2 10-8 Ka3 4.8 10-13 What is the pH of a 0.19 M solution of NaH2PO4?

Chemistry

Identify the solvent and the solute in vinegar, a dilute aqueous solution of acetic acid.

Chemistry

Calculate the percent by mass of water in magnesium sulfate heptahydrdrate (MgSO4-7H2O)

chemistry

describe a method to determine if a solution is made of kci or C6 h12 o6 without tasting it

Chemistry

Identify the solvent and the solute in vinegar, a dilute aqueous solution of acetic acid.

Chemistry

Calculate the percent by mass of water in magnesium sulfate heptahydrdrate (MgSO4-7H2O)

chemistry

For a 0.001 molar solution of NH4HCO3, the van’t Hoff factor would be about a. 1. b. 2. c. 3. d. 4. e. 5.

Chemistry

Can you draw a structural formula illustrating the complete combustion of ethanol? Please...It is confusing to me!

chemistry

The reaction SO2 + 1/2O2 -->SO3 has kp equal to 6.55 at 627C. what is the value of kc at this temperature? how do you set this up?

chemistry

DrBob222 - for molar mass do you use significant figures? If so would the answer be 0.05 (3.55/65.39)3.55 has 3 SF's correct?

gen chemistry

Which of the following compounds has the highest boiling point? HI H2Te H2O AsH3

Chemistry

45.0 ml of 9.0x10 the negative 2m hno3 I am needing the steps to help solve the above chem equation

Chemistry

Which aqueous solution has a freezing point closer to its predicted value 0.01 m NaBr or 0.01 m MgCl2?

chemistry

The mass of FeSO4.7H2O required to prepare 500mL of 280ppm Fe2+solutin is

chemistry

How much water at 25 degrees celsius is needed to dissolve 10 grams of baruim phosphate?

chemistry

write the two half-reactions for the reduction of nitrate to nitrite using Cd2+

chemistry

Write a net equation for the reaction between aqueous solutions of NH4Cl and Na2SO3.

chemistry

Write a net equation for the reaction between aqueous solutions of NaNO2 and NaH2PO4.

chemistry

Write a net equation for the reaction between aqueous solutions of HBr and NH3.

chemistry

Write a net equation for the reaction between aqueous solutions of NaHSO4 and NaCN.

chemistry

Write a net equation for the reaction between aqueous solutions of NaC2H3O2 and H3PO4.

chemistry

Write a net equation for the reaction between aqueous solutions of HClO4 and NaH2PO4.

chemistry

Write a net equation for the reaction between aqueous solutions of Na2HPO4 and H2CO3.

College chemistry

How do you calculate the number of mL you would use to prepare 5.0 L of 0.20 M NaOH from a 5.23 M stock solution.

General chemistry

What is the decay constant for a radioactive isotope which decreases to 34% of its original value in 2.48 hours?

Chemistry

what happens when sodium chloride is added to boiling water and why?? Can someone please explain!

chemistry

for flammable liquids what is the relationship between the evaporation rate and the likelyhood that the liquid will burn?

chemistry

for flammable liquids what is the relationship between the evaporation rate and the likelyhood that the liquid will burn?

chemistry

Why is the carbon dioxide gas that carbonates fountain drinks stored in sturdy canisters?

Chemistry

Determine the freezing points of each 0.20m aqueous solution. a)K2SO4 b)CsNO3 c)Al(NO3)3

Chemistry

Regarding previous post: I don't understand what I'm doing. My book says the answer is .50 M Ba(NO3)2 but I'm not getting that.

Chemistry

How many mL of 18 M H2SO4 are required to react with 250 mL of 2.50 M Al(OH)3 if the products are aluminum sulfate and water? How do i solve this?

Chemistry

What is the molal concentration of an aqueous calcium chloride solution that freezes at -2.43 degrees Celsius?

chemistry

Why is carbon dioxide gas that carbonates fountain drinks stored in sturdy canisters?

Chemistry

What is the molality of a solution composed of 11.1 g NaCl dissolved in 638 g of water? Answer in units of m.

chemistry

calculate the amount of heat necessary ti raise the temperature of 8.5kg of water from 12.5 to 84 degrees C

Chemistry

I think that titrating NH3 with HCl solution has a neutral equivalence point where the pH = 7.0. Is this right?

Chemistry

What does the subscript "s" on H2O(s) signify? A. seconds B. Super hard C. It is in its standard state. D. It's a solid

chemistry

What can be said about opposing forces of attraction when sodium chloride dissolves in water?

chemistry

describe the opposing forces of attraction that are at work in the dissolution of calcium chloride. which are greater?

Chemistry

Does titrating HNO3 with NaOH have a neutral equivalence point where the pH = 7.0? I say yes. Is that right?

Chemistry

Find the molar solubility of silver sulfide Ag2S. Ksp is 6.0 x 10^-51. I get 1.1 x 106-17. Right?

Chemistry

Sorry I nee to add something. The Ka for HF = 1 x 10^-3. Is 50.0 mL of 1.0 M HF and 25.0 mL of 1.0 M NaOH a buffer with an approximate pH of 3? I say yes. Right?

Chemistry

What is the molar hydronium ion concentration in solutions with pH values of a) 3.45 and b) 10.290. How do you work these problems?

chemistry

what mass of potassium hydroxide is required to produce 2.00L of a solution mthat has a pOH of 4.5?

College Chemistry

How do i calculate the pH when 200ml of .200M HCl is added .4998M of sodium acetate?

College Chemistry

How do i calculate the pH when 200ml of .200M HCl is added .4998M of sodium acetate?

chemistry

what type of intermolecular force describes the interaction between Ca2+ and Mg2+ with water?

chemistry

How many kilojoules are released when 90.0 methanol is burned? I know the answer is 1020 kj but have NO idea how to get it, or what I'm doing wrong.

Chemistry

What is the formula for calcium oxalate dihydrate when 100 degree Celsius heat is added?

chemistry

how do you write teasing in an adjective way, like use the word to decribe the tone

Chemistry

what would be the concentration of chromate ion in a saturated solution of CaCrO4 (Ksp= 7.1x10^-4)

Chemistry

Calculate (triangle H) for the complete combustion of 10.0g benzen. Equation? and could someone give me the answer?

Chemistry

What is the standard heat of reaction (Delta H^0) for the decomposition of hydrogen peroxide? 2H2O2 (l) ==> 2H2O (l) + O2(g)

chemistry

What is the standard heat of reaction (Delta H^0) for the decomposition of hydrogen peroxide? 2H2O2 (l) ==> 2H2O (l) + O2(g)

chemistry

why do batteries keep their charge if kept in a refrigerator over a long period of time

chemistry

How many milliliters of 0.246 M HNO3 should be added to 213 mL of 0.00666M 2,2'-bipyridine to give a pH of 4.19?

chemistry help me please

What values does STP have for pressure in the units of kPa and atm and mmHg?

chemistry

how do i write this reaction in cell notation I2(s) + 2MnO4-(aq) + 4H+(aq) → 2IO3-(aq) + 2Mn2+(aq) + 2H2O(l)

10th chemistry

what mass of sucrose, C12H22O11, is needed to make 300.0 mL of a .50M solution?

chemistry

Which is the substance dat is oxidised & reduced ? : 2KMnO4 --> K2MnO4 + MnO2 + O2 ?? ( THANKZ ALOOT )

General Chemistry

What is the molarity of a solution produced by dissolving 61 g of KNO3 in a 100 mL volumetric flask?

Chemistry

How many grams of potassium chloride (KCl) could be dissolved in 200g of water at 80 degrees celsius?

chemistry

what is the oxidizing agent in the equation 8H(aq)+ 6Cl(aq)+ Sn(s)+ 4NO3(aq)yields SnCl6(aq)+ 4NO2(g)+ 4H2O

chemistry

How to Convert 1 ton Of Steam (Pressure 24Kg/cm2) and ( Temperature 320 C) to K Mol?

Chemistry

How many kilograms of chlorine are in 22 kg of each of the following chlorofluorocarbons CFCs? 1.CF2Cl2 2.CFCl3 3.C2F3Cl3 4.CF3Cl

chemistry

When you set up the ICE chart, are you supposed to bring the 0.05 to the product side to give you an equation of x^2 / x - 0.05?

Chemistry

If the light travel 3.0 times 10 to the power of 8 meters/secs. How long it will take in miles/hr

chemistry

you are right....I wrote it wrong. Does this mean that the solution will be more toward the redish side?

High School Chemistry

Determine the pH of solutions with the following ion concentrations: 1) {H+} = 1.0x10 to the negative 3 M

Chemistry

Write the condensed structural formula for each of the following molecules: a.ethylcyclopropane b. methylcyclohexane c. isopropylcyclopentane

chemistry

What solid is formed upon addition of silver nitrate to a solution of cobalt chloride?

Chemistry

A student worked with a sample of ZnSO4.7H2O, what is the stoichiometric ratio of salt to water?

Chemistry

What is the name of the following compounds; Hg2(BrO2)2 Au(OCN)3 AuSCN Ni3(AsO4)2 Thank you

Chemistry

What is the overall order of reaction for the elementary system A+2B=products? a)0 b)1 c)2 d)3 e)5 Can somebody explain this question to me. I don't get it.

Chemistry

what are the condensed structured formulas of the products in each of the following reactions: cyclohexane+ H2-->Pt and cis-2-butene+ H2 -->Pt

Chemistry

a 700 mL flask contans 0.500 moles of O2 at 25. degrees celcius what is the pressure in atmosphers.

12th grade chemistry

How do I prepare 500 ml of a .100 mol/L solution of copper sulphate.

Chemistry

If 5.0 moles of propane react, how many molecules of water will be formed? A.3.0x10.24 B.4.8x10.24 c.1.2x10.25

organic chemistry

account the difference in the crystals formed through rapid and slow crystallization.

chemistry

calculate volume of co2 produced by combustion of 40 ml of acetone in presence of excess oxygen?

chemistry

Using structural formula, draw formulae illustrating the complete combustion of ethanol

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