chemistry! URGENT

60,827 results, page 77

Chemistry

Please help! I need to calculate the enthalpy change of the POCL3.

Chemistry

How do I identify the reducing agent in a reaction of magnesium with oxygen?

chemistry

the particles protons and neutrons present in atomic nucleus are known as......

chemistry

what is reason for the different atomic masses of the isotopes of an element

Chemistry

How many moles of methanol are dissolved in 1.5 L of water to make a 2.0 m solution?

Chemistry

How many moles of K atoms are there in 152.8247 grams of KMnO4?

AP CHEMISTRY

What does a negative value for a standard potential indicate? PLEASE HELP!!

Chemistry

how many grams of aluminum sulfate are produced if 23.33 g Al reacts with 74.44 G CuSO4

Chemistry

Give the major ideas of the kinetic molecular theory.

chemistry / help please

What is the name of: ZnNO3, of (NH4)2O, of Rb3PO4, or NH4ClO4?

chemistry

why does C4H10 have a higher BP than C2H6,C3H8, CH4

Chemistry

What are some chemical, extensive, and intensive properties of a pencil?

Chemistry

What is the reason that chemists chatagories Fe,Co and Ni in the same group VIIIB?

chemistry

will fe3+ oxidize Sn2+ to Sn4+ in acidic solution?

Chemistry-please help!

What is the meaning of combining power of elements and radicals?

Chemistry-please help!

What is the meaning of combining power of elements and radicals?

chemistry

What is the molality of a solution containing 7.8 g of MgCl2 in 725 g of water?

chemistry

what mass NaOH is required to react exactly with 25.0 ml of 3.0 M H2S04

chemistry

Calculate the value of Kc for 4NH3(g) + 3O2(g)= 2N2(g) + 6H2O(l)

chemistry

if 25.0g of O2 gas has a temperature of 400k and a pressure of 610 mm Hg, what is its volume?

chemistry

Kp for the reaction is 1.47 at 727°S CO2(g) + C(s) 2CO(g) Calculate Kc at this temperature

chemistry

When the following reaction is at equilibrium, which of these relationships is always true? 2 O3(g) 3 O2(g) A. [O3]2 = [O2]3 B. Kc[O2]2 = [O3]3 C. [O3] = [O2] D. Kc[O3]2 = [O2]3 E. Kc[O2]3 = [O3]2

chemistry

What is the final volume in milliliters when 0.698 of a 42.2 (m/v) solution is diluted to 21.1 (m/v)?

chemistry .....please help

Which of these temperatures is closest to 100 K? A. -173 °C B. 18 °C C. 0 °F D. 212 °F

Inorganic Chemistry

1) 5.0 mL of 6.0 x 10^-4 potassium 5.0 mL of the solution prepared above are then mixed with

chemistry

determine the number of moles of FeSO4 in sample Y that you use

chemistry

determine the concentration of Fe2+ ion the prepared solution

chemistry

How many moles of chloride ions are present in 18.4g of CaCl2? I don't know how to set this up...

chemistry

describe a prepare a 0.25 L.0.5 mol standart solution of NaoH

Chemistry

COmbination of nahco3andhcl what is before,after,mixture, and change?

chemistry

On the pH scale, any substance with a value between 8 and 14 is considered _________.

chemistry

Calculate the pH of an Aqueous 3.8 x 10^-5 M solution of barium hydroxide. I need help.

chemistry

chemical formulae which ends with ite,ate and ide

chemistry

calculate the density of a liquid if 47.9mL of it has mass of 49.06g

chemistry

How many liters is 5.8 mole of neon at STP? Show work

Chemistry

When hydrogen reacts with a metal, does it form a cation or an anion?

Chemistry

What is the density of a solution of 9.0% Calcium chloride dissolved in water?

chemistry (lab)

how or where does the hat energy produced by the candle come from ?? help me!

Chemistry

What mass of KBr is required to prepare 8.oo L of .400 M solution?

organic chemistry

how to find ethyl benzoate from methyl benzene

chemistry

Calculate the molality of CsCl in a 19% by mass aqueous solution.

Chemistry

How can you predict the heat of combustion for a substance with no carbon atoms?

chemistry

a piece of copper has a mass 740kg,what is the units in grams

Chemistry

How many moles of H_2 are needed to produce 13.27g of NH_3?

science

what is the best way to study for my chemistry test tomorrow

chemistry

chemical formula for potassium hydrogen sulfide? is it KHS?

Chemistry

What is the reactant when sugar is mixed with water? Also, what is the product?

chemistry

What is the valency and outer most electrons in scandium to zinc?

Chemistry

Would Ti3(PO4)2 be titanium phosPHATE or phosPHIDE

chemistry

how do you name halogens as a functional group. like CH3-Cl

Chemistry

What is the pH of a 0.50 M solution of NaNO2 if the Ka of H20x = 4.5 x 10^-4. I know that you use the Ka to find Kb and solve from there, but why?

chemistry

Identify a haloalkane and describe the manner in which it functions as an anesthetic.

chemistry

balanced equation mg+ pbcl2---mgcl2+pb F+NaBr--FBr+Na

Chemistry

if there are 8.3grams of Mg used, how many moles of MgO can you expect to be produced?

chemistry

A sample of oil has a mass of 65g and a volume of 80.0 mL. What is the density?

chemistry

How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

chemistry

How many photons are produced in a laser pulse of 0.324 J at 631 nm?

chemistry

how much heat is released when 42.3 grams of ammonia is produced?

Chemistry

What mass (g) of KHP is required to neutralize 10.00 mL of 0.1092 M NaOH?

chemistry

If i have .0030M BaSO4 how do I calculate the moles of sulfate?

Chemistry

The volume in cubic meters of a 141541 kg blue whale?

chemistry

What is the mass (in grams) of 9.81 × 1024 molecules of methanol (CH3OH)?

chemistry

Why would benzene boil at 100C instead of 80C?

chemistry

what is the balanced molecular formula and state for this equation Mg+Cr(C2H3O2)3=

chemistry

how would you separate a mixture of NaCl, Fe pellets and water

chemistry

how would you separate a mixture of NaCl, Fe pellets and water

chemistry

2C6H6(l) + 15O2(g) --> 12CO2(g)+ 6H2O(g) how to calculate the ratio?

Chemistry

How many moles of KBr are present in 120mL of a 0.290M solution?

Chemistry

Why do acids and bases form ions when they dissociate in water

chemistry

5.22kg of H2 reacts with 31.5kg of N2, which one is the limiting reactant?

chemistry

How many grams of C3H18O2 contain 7.9 e25 atoms of Carbon?

chemistry

how to find ph of aqueous solution if your only given the concentration

chemistry

why is the bond length an average rather than a fixed number ?

Chemistry

how many grams of hydrogen occupy 40 ml at 300.15 K and 710 torr?

chemistry

What mass of sodium bicarbonate reacts with 225 mL of 6.00 M HCl?

Chemistry

which one of the following cannot disproportionate cl-, clo3-, cl2, cu+, fe2+

Chemistry

How many milliliters of 2.50 M KI must be diluted to make 365 mL of 0.432 M KI?

chemistry

what is free energy for h2+br2=2hbr at 25 degrees celcius

chemistry

what is the normality of sodium carbonate of 55 grams in a solution of 4000 ml

Chemistry

What element forms an ion with an electronic configuration of [Xe] and a –2 charge?

Chemistry

What happens to the size of an atom when it becomes a negative ion? Why?

Chemistry

What happens to the size of an atom when it becomes a negative ion? Why?

chemistry 101

How intermolecular forces is responsible for the phases of matter?

Chemistry

What is the generic outer electron configuration for the alkali metals?

Chemistry

12 grams of salt dissolved in 650 mL of water has what concentration?

chemistry

How many grams of K2HPO4 are there in a teaspoon? Tablespoon? How do I figure this out?

Chemistry

How many moles of propane are contained in a 5.00 L tank at 450 torr and 25°C?

Chemistry

How do I change 3,3,4,4,5,5-hexamethyl-1-hexyne into it's molecular formula

chemistry

How many atoms of nitrogen are in the chemical formula N2O? A. 1 B. 2 C. 3 D. 4 I say A

Inorganic Chemistry

Name this compound: [Co(NH3)5Cl]Cl2

chemistry

describe the troubles of boilers when impure water is used

chemistry

how many atoms are in a sample of 175 g of sodium (Na)? 4.58 x 1024 or 1.42 x 1027?

chemistry

Calculate the molarity of 38.5 mL of 1.80 M HNO3 diluted to 0.130 L with water

chemistry

what are the three pure liquids produced by chemical reactions

Chemistry

Devise a test to distinguish between Cu2+ and Co2+.

Chemistry

Devise a test to distinguish between Cu2+ and Co2+.

Chemistry II

Devise a test to distinguish between Cu2+ and Co2+.

Chemistry

Devise a test to distinguish between Cu2+ and Co2+.

Chemistry

Devise a test to distinguish between Cu2+ and Co2+.

chemistry

compleat and balance this equation. Na2CO3+Mg3(PO4)2

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