chemistry! URGENT

60,378 results, page 94

Chemistry

energy required to raise the temp of H2O from -15C to 125c

Chemistry

How does looking at the number of molecules of products vs. reactants show the Estamation of ÄS?

chemistry

what is the final molarity when 250ml 0.45M is mixed with 350mL water

Chemistry

What is the frequency of the photons emitted by hydrogen atoms when they undergo transition from n=5 to n=3?

chemistry

Why does specific heat increase the greatest when it's near its freezing point?

Chemistry

Given 3.90mL of 1.80M HCl diluted to .520L, whats the pH?

Chemistry

Given 3.90mL of 1.80M HCl diluted to .520L, whats the pH?

Chemistry

What is the pH of a saturated solution of lead(II) hydroxide? The Ksp= 4.0 X 10-15. a) 4.7 b) 7.2 c) 9.0 d) 9.1 e) 9.3 What should I do to solve for this? Thank you

Chemistry

Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.03? The Ksp of Fe(OH)2 is 4.87×10-17 M3.

Applied Chemistry pls help!

At what depth in water is the pressure equal to 2.0m atmosphere?

Chemistry

Calculate the [H+] in a solution containing 1.00 M hydroflouris acid (Ka=7.2 x 10^-4) and .50 M sodium fluoride

Chemistry

Calculate the concentration of aqueous solution of barium hydroxide whose pH is 12

Chemistry

Calculate the concentration of aqueous solution of barium hydroxide whose pH is 12

Chemistry PLZ HELP!!!!!

what conditions must exist for a polyatomic molecule to be nonpolar?

Chemistry

How many mL of .175M H3PO4 are needed to neutralize 15.00mL of .33M NaOH?

Chemistry

What will happen to the room temperature if the refrigerator door is kept open?

Chemistry PLZ HELP!!!!!

what are the names of three important nitrogen fertilizers with their formulas?

chemistry

which are ionic compounds? SO2 PCl3 NaBr PbO AlF3

Chemistry help

COVALENT BONDS BETWEEN THE MONOMERS OF AN ENZYME MACRO MOLECULE ARE?

Chemistry

Complete and balance the following equation: NO2{-} + Cr2O7{2-} = Cr{3+} + NO3{-}

Chemistry

Complete and balance the following equation: NO2{-} + Cr2O7{2-} = Cr{3+} + NO3{-}

Chemistry

What is the equationfor this?: Sulfur reacts with oxygen to produce sufur trioxide

chemistry

Which of the following will cause a greater amount of oxygen to dissolve in 100 g of water?

Chemistry

what is the molality of a solution prepared by dissolving 13.0 g of Ba(NO3)2 in 450 g of water?

Chemistry

What is the smallest whole-number ratio of ions in a crystal lattice?

Chemistry

What is the possible ionic equation of TrisEDTA solution? REDOX reaction.

Chemistry

How many total atoms of all elements are present in an acetate ion?

Chemistry

What is the symbol for the element whose electron configuration ends with 4p6?

chemistry

Determine the heat of combustion of ethanol by using the bond energies

Chemistry

What are the possible values of the azimutal quantum number for an electron in the 4f subshell?

Chemistry

What physical properties will the ionic compound CaSO4 be expected to have?

Chemistry

Calculate the mass of each compound containd in 60g of a 4.5%m/m CaCl2(aq)solution

chemistry

Calculate the theoretical pH when 5.00 ml of 0.0100 M HCl is added to 30.00 mL of deionized water.

CHEMISTRY

THE HEAT OF NEUTRALIZATION OF 0.120KG OF ethanoic ACID WITH EXCESS OF NaOH

Chemistry

How do you prepare 2% Cu S04? How does this solution differ from 2M CuS04? I am stumped. Thank you. Deb

Chemistry

Balance the following equation in acidic conditions. S2O3^2- +Cu ^2+ > S4O6^2- +Cu^+

Chemistry

What is the limiting reagent when 150.0 g of nitrogen react with 32.1 g of hydrogen? N2(g) + 3H(g) > 2NH3(g) Thank you

Chemistry

7.8 g of calcium fluoride is dissolved in 100 L of water at 25°C. Will a precipitate be formed?

Chemistry

25 mL of NaOH 0.16 M is added to 50 mL of 0.1 M HCl. What is the concentration of hydroxide ions in the solution?

chemistry

how do you identify the base in this reaction? h2o(L) + CH3NH2(aq) yields OH-(aq) + CH3+(aq)

Chemistry

the chemical dichlorobenzne will not disolve in water, what muct the polarity of dichlorobenznebe by and why?

Chemistry

25g of ethanol is dissolved in 1.50 kg of whater. what will the boiling point of the solution be?

Chemistry

Calculate the volume of Ba(OH)2 0.20 M necessary to neutralize 300.0 mL of H3PO4 0.30 M. (4 marks)

chemistry

Write the double-replacement reaction of HgCl2 reacting with Na2CO3.

chemistry

Write the double-replacement reaction of PbCl2 reacting with Na2CO3.

chemistry

Can someone pleeeeeaaase explain Charle's law in a simple way.

Chemistry

As I understand it--As an acid is added to neutral water the (OH-) will...decrease?? Is this right?

Chemistry

What minimum amount of 1.55 M \rm HCl is necessary to produce 26.5 L of \rm H_2 at STP?

chemistry

KMnO4 + H2SO4 + KNO2---> MnO2 + KNO3 + K2SO4 + H2O

Chemistry

what elements are found in the following substances? C6H12O6, NaCl, NaHCO3

Chemistry

Describe the density and compressibility of solids versus liquids and gases.

chemistry

what is the mechanism of formation of various hydrazides by using hydrazine hydrate

Chemistry

Express the concentration of a 2.0 M NaOH solution as a mass/volume percent.

chemistry

How does a straw work? Using the Kinetic Molecular Theory to explain?

chemistry

a 100ml solution of 0.01M sodium chloride has how many ppm (mg/L) please?

Chemistry

in any aqueous solution what effect does the addition of NaOH (aq) have on the concentration of H+ (aq)

Chemistry

Which of ions most abondant in sea water Na+ ,Ca2+ ,Cl-,HCO3-

Chemistry. Please help quick!!!

Is this chemical formula (Fe2O3) iron oxide?

chemistry

what is the difference between a redox rxn in and acidic soln or basic

Chemistry

If a plant produces 8.06 mol of C6H12O6 how many moles of CO2 are needed

Chemistry-please help quick!!

Write the balance chemical equation for lime.

chemistry

Who much molar energy is releced from reacting NaHSO3 and HOCl?

chemistry

why the increasing in substrate concentration increase in the rate of reaction of enzymes.

chemistry

How can you precipitate BaCrO4(s) from a solution of barium nitrate and potassium dichromate?

chemistry

What is the absolute entropy of 3.1 mol of gaseous ammonia at 1.8 bar and 298 K?

chemistry

wh should the maximum percent yield never be above 100%

chemistry

why is it unwise to boil the oxolate solution in preparation for it's titration with permanganate

chemistry

How many moles of NaOH must be added to 1.00L of this solution to increase the PH to 9.25?

chemistry

why does a desert cooler cool better on a hot dry day ?

Chemistry

How would you separate a mixture of potassium chloride from copper metal?

Chemistry

Ammonia is a stronger ligand than is the chloride ion. What does this statement mean?

Chemistry

How many grams of CaSO4 are present in 320ml of a 0.00810 M solution of this compound?

Chemistry

Balancing Equation Al2C3O3 + H3PO4 --> AlPO4 + CO2 + H2O

chemistry

could the products ever become the reactants in chemical reaction? explain. thanks!

AP Chemistry

how many milliliters of 0.125 M H2SO4 are needed to neutralize 0.200 g of NaOH?

chemistry

What is the pH of an aqueous solution of a weakly acidic drug that is 40% dissociated and has a pKa =4.7?

Chemistry

Calculate the temperature at which k = 2.0 s-1 if k = 10.0 s-1 at 371 K. The activation energy for the reaction is 30.0 kJ mol-1.

chemistry

What mass in kilograms of E85(d = 0.758g/mL) can be contained in a 11.5gal tank?

chemistry

What is the density of a sphere with a radius of 12.7 meters and a mass of 285 kilograms?

Chemistry

What does the reaction of alkaline earth metals with water tell you? Thanks in advance.

chemistry

The concentrations of Ca and Na in a sample of river water are 13.4 mg/kg and 5.2 mg/kg. Express the concentration in molality

Chemistry

Calculate the H+ ion concentration if 0.20M NH3 solution is 2.5% ionized.

Chemistry

Which element has no stalbe isotopes: 82Pb, 27Co, 51Sb or 90Th?

AP Chemistry

What is the molarity of 827 mL of a solution that contains 0.057 mol of solute?

Chemistry

If your body develops a charge of -18 (microcoulombs), how many excess electrons has it acquired?

General Chemistry

A solution of LiCl in water has XLiCl = 0.0800. What is the molality?

chemistry

how would you, explain ans how calcium chloride [CaCl2] is bonded.

chemistry

how many grams of carbon dioxide can be produced by burning 7.04moles of propane

chemistry

What is the nuclear symbol for the radioactive isotope of copper with a mass number of 60?

Chemistry

Calculate the molarity of a 100. mL solution containing 22.3 g of sucrose (C12H22O11)

chemistry

large and small number are most easily handle when expressed in

chemistry

Which of the following elements is synthetic? uranium iodine helium nobelium

Chemistry - ASAP please!

what is the hybridisation state of the oxygen of a carbonyl group

chemistry

Radon-222 undergoes alpha decay.what is the nuclear equation

Chemistry

What is the temperature change in celsius when 29.5L of water absorbs 2.3 kwh of heat?

Chemistry

Round this to two sig figs: 4025000 Is the correct answer 4.0 x 10^6?

Chemistry

calculate the volume of a rectangular prism with a length of 5.6 , a width of 2.1 , and a height of 6.6 .

chemistry

what type of bond would carbon, sodium, and neon form?

chemistry

what is the complete ionic equation for the double displacement of CuNO3(aq)+K2S(aq)

Chemistry

How would we make 500mL of a 1.5 percent w/v solution of KCl in water?

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