CHEMISTRY (WEBWORK)

58,662 results, page 96

chemistry

The mass of cao that can be prepared by heating 200g of caco3 which is 95 percent pure is

Chemistry

If only 1.31 grams of water are actually produced in the lab, what is the percent yield?

chemistry

What mass of Na2SO4 is needed to make 8.5L of 4.0M solution? Is the answer 7480 grams?

Chemistry

in the reaction: Cl2 + 2HBr ----> 2HCl + Br2 identify the reduced specie

Chemistry

What is the salt most likely to be formed at the junction of the Fe2+ions and SiO4+

Chemistry

What is the pH of a solution obtained by adding 15 g deK2SO4em 150 ml NaHSO4 with Molarity of 0, 2 m. HSO4 Ka = 1, 3.10^-2

Chemistry

Which of the following solutions has a molarity different from the rest? a. 6 N H3PO4 b. 4 N Ca(OH)2 c. 8 N HC2H3O2 d. 2 N NH40H

chemistry

Make the conversion 8.5 x10^2 cal to Calorie 4.5x10^-1kj to calories

Chemistry

What size container do you need to hold 0.0459 mol of N2 gas at stp

Chemistry

Suppose that 30 mL of 0.5 M CsOH and 55 mL of 0.1 M NaHS are mixed. What is the K for the dominant equilibrium in terms of Ka's, Kb's, Kw etc.? Ka of HS- 1/Ka of HS- Kb of OH- 1/Kb of OH- Kb of S-2 1/Kb of S-2 Kw 1/Kw There is no reaction.

chemistry

explain briefly why CuSo4 is more soluble in water than in organic solvent

Chemistry

. Okay 2HgO turns into 2hg + O2. What mass of Co2 can be produced from 25.0g of Fe3O4 ?

Chemistry

Describe how you would make a 125 mL of 0.025 M solution of potassium dichromate?

chemistry

When 23g of C8H18 is combusted at STP, how many liters of carbon dioxide is produced?

Chemistry

What is the difference between an Arrhenius acid/base, a Brønstead Lowry a/b and a Lewis a/b?

Chemistry

2Mg +O2 > 2MgO Write experiment to prove that the product is basic oxide?

Chemistry

What volume of 1.00M ca(oh)2 is needed to neutralize 250.0mL of 0.100M HCL?

Chemistry

what volume of 1.00M ca(oh)2 is needed to neutralize 250.0mL of 0.100M HCL?

Chemistry

If it takes 45 days for 80.0 mg of a particular radioactive isotope to decay to 10.0 mg what is its half-life?

Chemistry

If it takes 45 days for 80.0 mg of a particular radioactive isotope to decay to 10.0 mg what is its half-life?

chemistry

How many joules of heat are required to completely covert 95.0 grams of water to steam?

Chemistry

If you had .1 ml in a 1M solution of HCl how much water would you need to dilute it to a pH of 7?

Chemistry

How do you find the mass of iron in audio tapes per metre of tape?

Chemistry

What is the molecular mass of a substance X if 1.00 L of a solution containing 4, 5 g of X has an osmolality of 0.337 mmHg the 30° C?

Chemistry

The molar solubility of a generic substance, Mg(OH)2 ksp = (1.2x10^-11) in 0.10 M NH3 Kb = 1.8 x 10^-5 help me please =)

Chemistry

Use the collision theory to explain the increase in rates of the other reactions

Chemistry

Balance the reaction step-wise: As2S3(s) + NO3^- + H^+(aq) to AsO4(aq) + S(s) + NO(g) + H2O(l)

chemistry

Write the equilibrium constant expression for the reaction 2 NO (g) + Br2 (g) ↔ 2 NOBr (g)

Chemistry

calculate the molarity of a NaOH solution that requires 42.55 mL to neutralize 3.53 grams of KHP

chemistry

Which type of heat transfer is not blocked even by an insulated thermos? radiation ???

Chemistry

What is the wavelength of light (in nm) if the energy of the wave is 1.33x 10^-19 J? How do I work this problem out????

Chemistry

How do i find the PH and pOH of 12.5ml of 15.8M HNO3 added to 400ml of 0.57M KOH

Chemistry

How many grams of ethanol, C2H5OH, are required to make a 7.1M solution using 1.50 L of water

Chemistry-Dr.Bob222

Calculate the molar solubility of calcium hydroxide in a solution buffered at each pH. a. pH=4 b. pH= 7 c. pH=9

chemistry

How many mL of 0.4040 M HNO3 would be needed to neutralize 55.00 mL of 0.1234 M potassium hydroxide?

Chemistry-ish

What is the pH of a solution that has a OH- concentration equal to 1x10-5M? 14-x 14-5=9 can I use that simple of math 9?

Chemistry

DrBobb22 Calcule the concentrations of Cd^+2 , [Cd(CN)4^-2] and CN^- at equilibrium, when 0.42 moles of Cd(NO3)2 dissolves in 1 L of 2.50 M NaCN Kf for Cd(CN)4^-2 Help!

Chemistry

what is the osmotic pressure produced by a 1.20M glucose (CH12O6) solution at 25 degree

chemistry

white powder of calcium oxide is added to beaker containing water?

chemistry

what is the actual freezing temperature of a 0.50m aqueous solution of sodium chloride?

Chemistry

What are transferred in an oxidation-reduction reaction? atoms*** electrons ions protons

Chemistry

What is the concentration of 127 mL of solution made with .450 g of nickel (II) nitrate hexahydrate?

Chemistry help asap

what two ingredients are used to prepare basic buffer solution??

chemistry

add any reducing agent to kmno4+k2cr2O7+k1 and reconcile the charges and equations

chemistry

Calculate the volume of the ammoniacgas formed when nitrogen reacts with 6 litres of hydrogen

Chemistry

A 25.0-g sample of sodium hydroxide is dissolved in 400.mL of water. What is the concentration of the solution?

chemistry

what are the products of a concentrated solution of magnesium chloride if the electrodes used are inert

chemistry

Which of the following is not a part of the scientific method? A. hypothesizing B. experimenting C. observing D. proving D?

Chemistry

what is the percent by mass of a solution by dissolving 200 g of NaCI in 500 mL of water?

chemistry

calculate the momentum of a particle ,whose de Broglie's wave length is 0.1nm ?

Chemistry

Calculate the mass of HF required to prepare 200 mL of 0.25 mol/L solution. P = 40%; d = 1.14 g/cm3

Chemistry

What is the theoretical yield of Fe2(SO4)3 if 20.00 g of FePO4 reacts with an excess of Na2SO4?

Chemistry

Ammonium phosphate and nickel(II) nitrate solutions are mixed, what precipitates out?

chemistry

Difference between a halogen and a halide? Explain using chemical formulas.

chemistry

To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.

Chemistry

Which of the following atoms would have the highest first ionization energy? A. Li B. Be C. Na D. Mg

chemistry

what will be formed when oxygen combines with hydrogen in the presence of hydrated iron 3 oxide?

Chemistry

How many grams of Nitrogen contains same number of neutrons as 6grams of 12C?

Chemistry

Mercury has a melting point of - 38. 9°C. what would this read in degrees Fahrenheit the and kelvin

Chemistry

Calculate the mass of the precipitate formed when 2.27 L of 0.0820 M Ba(OH)2 are mixed with 3.06 L of 0.0664 M Na2SO4.

Chemistry

Write the net ionic equation for HClO4(aq) + NaOH(aq) --> H2O (l) + NaClO4(aq).

chemistry

The amount of sulphuric acid (in gm) required to neutralise 10L of ammonia at STP is

Chemistry

Which of the following would be the best to measure 18mL of acohol accurately and precisely

Chemistry

How many electrons involved in the reduction of one mole of Al2o3 to aluminium metal

Chemistry

Which is a conjugate pair in the following equilibrium? H2C2O4(aq) + HPO4(aq) 2- HC2O4(aq)- + H2PO4(aq)-

Chemistry

Calculate the degree of dissociation and oh conc in 0.1m (nh4)3po4 having alpha 50%

chemistry

Which of the following bases could you write an equilibrium expression for? A. Ba(OH)2 B. KOH C. NaOH D. NH3

chemistry

Which is most acidic in its aqueous solution? a)FeCl3 b)AlCl3 c)NiCl3 d)BeCl2

chemistry

In an electrolytic solution the density of CuSO4 decreases or increases or remains constant?

chemistry

When we are calculating the molality of KNO3 in H2O do we add i the van hoff factor

value chemistry

observation made when chlorine is bubbled through sodium iodide

chemistry

How many mL of 0.6 M H2SO4 solution are needed to react completely with 23.62 g of Fe2O3 in the following reaction?

chemistry

Is the following sentence true or false? The value of an error must be positive.

Chemistry

to determine the concentration of ascorbic acid in fruit juice using DCPIP

chemistry

Calculate energy change that produced the 4th line in lyman series

Chemistry

What mass of Na2S is produced when 20g of sodium reacts with excess sulfur?

CHEMISTRY

15.0g of KCLO3 was crushed and heated with about 0.1g of MnO2.Write an equation for the reaction.

Chemistry

What two facts did Newton need to be able to calculate the acceleration of the Moon?

Chemistry

To what volume should 10L of 0.5M CH3COOH (Ka = 1.8×10–5) be diluted in order to double the OH– concentration?

chemistry

explain the meaning of this statement"specific heat capicity of alumminium is 900J/kg°C"

Chemistry

Why gay lussac's law applicable only for gases and not for solid and liquid??????????!

Chemistry

Calculate the mass of Crystals that will form in 400g of water if the solution is cooled from 55°C to 15°C?

Chemistry

When 13.0 grams of acetylene, C2H2, is reacted, what mass of water, H2O, is produced?

chemistry

proof that the energy of the first spectra line in Lyman series E =3/4Eo Eo=2.18×10-18

chemistry

Why do some reactions go to completion while others reach a state of equilibrium?

Chemistry

Calculate the mass of water produced when 9.53 g of butane reacts with excess oxygen

Chemistry

How much reaction is complete when Kc=1, options: a.10% b.25% c.50% d.100% please explain the answer

chemistry

Calculate the standard enthalpy change for the following reaction at 25 °C. H2O+C(graphite)(s) --> H2(g) +CO(g)

chemistry

what is the name of this coordination compound [CoSO4(NH3)5]Br? my attempt: cobaltsulfatepentaamine Bromine

Chemistry

What is the balanced equation for the reaction including states? Does it form a precipitate? Cu(NO3)2 + KI

Chemistry

What mass, in grams, of sodium chloride is needed to prepare 15.0 ml of 10% (m/v) NaCl solution?

Chemistry

What mass of carbon dioxide is formed by the complete combustion of 760 g of ethanol?

Chemistry

what kind of reaction is this Sr(NO3)2 (aq) + K2CrO4 (aq) = SrCrO4 (S) + 2KNO3 (aq) and does it take place or NR, why?

Chemistry

Determine the mass of iron in the following solution. 325mL of 0.050 M FeSO4.

Chemistry

How many mL of acetone are required to make a 8.42 % v/v aqueous solution in a 300 mL volumetric flask?

Chemistry

What problems might arise if the anesthesiologist did not know the patient's higher body temperature?

Chemistry

A patient requires 0.012 g of painkillers available as a 15 mg/ml solution. How many ml should be administered?

chemistry

give the name of the process when anhydrous copper sulphate becomes wet

Chemistry

In Cl2 + 2KBr -> 2KCl and Br2 produce that brown yellow effect?

Chemistry

What volume of hydrogen, reacting with nitrogen, will produce 500 dm^3 of NH3 at STP?

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