Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

chemistry
How many numbers of molecules are contained in 24 litre ccl4? density of ccl4 = 1.59 gm

Chemistry
A 99.99% pure, 0.4903 g sample containing only carbon, hydrogen, and nitrogen is subjected to combustion analysis, resulting in the formation of 1.373 g CO2, 0.2791 g H2O, and 0.1860 g NO. What is the empirical formula of the sample?

Chemistry - Stoichiometry/gases
When 2.38 g of methane burns in oxygen, 119 kJ of heat is produced. What is the enthalpy of combustion (in kJ) per mole of methane under these conditions? Your answer will be in kJ/mol. the Molar Mass of methane is 16.04, so I did 2.38g/16.04=0.14838 mol Then I did 119 kj/0....

chemistry
If a substance has a concentration of 85 mmol/L and gives 3 particles on ionization, what would be its concentration in milliosmoles per liter?

chemistry
2.3g hydrogen react with 29g of oxygen to form water what is the limiting reagent

Chemistry
Determine how many mL of 0.102 mol NaOH solution is needed to neutralize 35.0 mL of 0.125 mol H2SO4 solution.

Chemistry
48.0 mL of Ca(OH)2 solution was titrated with 19.2 mL of 0.385 mL mol HNO3. Determine the molarity of the Ca(OH)2 solution.

chemistry
You have made a buffer solution where you added 9 mL 1M Acetic Acid and 0.82 grams Sodium Acetate and diluted it with deionized water to 100 mL. If the Ka for Acetic Acid is 1.76*10-5 and the molecular weight of Sodium Acetate is 82.03 g/mole, what is the pH of the buffer you ...

Chemistry
Gxghj

Chemistry
Name the gas which reacts with lead acetate solution to turn black.

science chemistry
One word of the chemical used to dissolve gold in the leach tanks with the aid of oxygen

science chemistry
One word for the chemical used to dissolve gold in the leach tanks with the aid of oxygen

chemistry
what is electromagnetic radiation

chemistry
Which one of the two salts precipitated? AgNO3 + K2SO4 = Ag2SO4 + KNO3

Chemistry
We are asked to find the pH of a buffer solution of Dinitrophenol and NaOH,with the necessary data given. Do they react at 1:1 ratio? What would be the products?

Chemistry
The indicator HIn has a dissociation constant of 1*10^-4 M. HIn<===> H30^+ + In^- Yellow Red When the pH value of the solution is 7, 1)the indicator shows the colour red 2)at this time most of the indicator has been dissociated Which statements are true? 1)I took this as...

Chemistry
Can we consider two solutions of 10^-4 M NaOH and HCl ,as weak base and weak acid solutions?

Chemistry
If the percentage of water of crystallization in MgSO4.xH2O is 13% , then what is the value of 'X'.

Chemistry
If from 10 moles NH3 and 5 moles of H2S04,all the H-atoms are removed in order to form H2 gas,then find the number of H2 molecules formed.

Chemistry
According to the following reaction, how many grams of tetraphosphorus decaoxide are required for the complete reaction of 26.5 grams of perchloric acid (HClO4)? perchloric acid (HClO4) (aq) + tetraphosphorus decaoxide (s) ---> phosphoric acid (aq) + dichlorine heptaoxide (...

Chemistry
Classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds. CO2, HCl, Al2S3, Cd, F2,Ag,O2,NaCl

Chemistry
How are the three types of intermomecular forces similar? How are they different?

Chemistry
When diluting the commercial vinegar, what would have been the effect on acetic acid molairty of failing to rinse the pooped with commercial vinegar, assuming there was some distilled water left in the piper from a previous student? ( think about how the concentration of the ...

Chemistry
The density of palladium (Pd) is 12.0 g/mL and the cell volume is 5.89 ✕ 10^−23 mL. Determine the number of atoms in the unit cell. (Because there cannot be a part of an atom in a unit cell, we must round the number of atoms to the nearest whole number.)

Chemistry II
84.6g of NH3 are dissolved in 822g of water. What are the concentrations of this solution in mass percent and molality? Mass percent= 10.3% Molality = 6.05 Mol/kg

Chemistry
Calculate the moles of Carbon dioxide in 7.5×10 power 24?

chemistry
A single, neutral iodine atom has

Science-Chemistry(mole concept)
How many kg of wet NaOH containing 15% water are required to prepare 70 litre of 0.5N solution?

Chemistry
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 g of luminol into a total volume of 75.0 mL of H2O. What is the molarity of the stock solution of luminol? Luminol has a molecular weight of 177 g/mol.

chemistry
what volume of ammonia gas, measured at 647.5 mmHg and 36.1C is required to produce 6.53 g of ammonium sulfate according to the following. 2NH3+H2SO4-(NH4)2SO4

Chemistry
At 57.7°C, the vapor pressure of CCl4 is 56.1 kPa, and its enthalpy of vaporization is 29.82 kJ/mol. Use this information to estimate the normal boiling point (in °C) for CCl4.

Chemistry
What's the difference between the pressure of a system and the partial pressures in relation to Le Chatelier's principles? I know that when the pressure of the system is increased, it goes to the side with less moles/particles and when decreased it will go to the side with the...

chemistry
Explain how 0.25molar sodium trioxocarbonate4 can be prepared for practical use the ml is 500.

Chemistry
How many moles of Cu are required to produce 16.25 g of H2O

Chemistry
How many moles of Cu are required to produce 16.25 g of H2O

Chemistry
A current of 96.5 amperes is passed for 18 minutes between nickel electrodes in 500 ml solution of 0.2M nickel nitrate.the molarity of solution after electrolysis is

chemistry
Which of the following ions possess a dipole moment? (a) ClF2+ has a dipole moment has no dipole moment cannot be determined (b) ClF2− has a dipole moment has no dipole moment cannot be determined (c) IF4+ has a dipole moment has no dipole moment cannot be determined (d) IF4...

Chemistry
"For 4HCl + O2 <-> 2Cl2 + 2H2O : If in a container of 1.0 L we start with 2 moles of O2 and 4 moles of HCl, the molar fraction of O2 is: a) x/5 - x/2 b) 1-x / 6+x c) 5x / 5-x d) 1-x / 5-x e) 2x / 6-x " I tried solving this, but I wasn't sure if all 2 moles of O2 were ...

chemistry
According to the following chemical equation: N2 + 3H2 → 2NH3 How many grams of hydrogen are needed to completely react with 28.0 grams of nitrogen?

Chemistry
What should be the pH value of the solution to double the solubility of the ionic compound NX? Ka of HX=2*(10)^-5 M My thoughts on the question: Let the solubility of NX=x M 1) NX(s)<====> N+(aq) + X-(aq) eq:con: x x (moldm-3) X^-<===> HX + OH^- -->(2) HX<...

chemistry kinetics
The rate constant is numerically the same for three reactions of first ,second and third order resp. Which reaction should be the fastest and is this for all ranges of concentrations ??

Chemistry
If you add 13.75 mL of 1.35 M HCl to 22.80 mL of 0.955 M Ca(OH)2, will you neutralize all the Ca(OH)2? You must show data to support your answer.

Chemistry
If it takes 22.75 mL of 1.75 M H3PO4 to neutralize 14.90 mL of Al(OH)3, what is the molarity of the Al(OH)3?

Chemistry
If it takes 15.0 mL of 0.450 M HNO3 to neutralize 22.00 mL Cu(OH)2, what is the molarity of the Cu(OH)2?

Chemistry
How many mL of 1.20 M H2SO4 are needed to neutralize 18.75 mL of 0.843 M LiOH?

chemistry
If 19.7g of ALL, is actually produced, what is the percentage yield? 2Al+3I2 2 All3

chemistry
if you react 5.00g of aluminum with 20.0g of iodine, how much aluminum iodide do you expect to produce from this reaction? what is the limiting reactant ? what is the excess reactant? how much of the excess reactant do you expect to have left over?

science - chemistry
The relative molecular mass of calcium carbonate (CaCO3) is 100. What is the minimum volume of 2.0 M hydrochloric acid (HCl) that would be needed to completely react with 2.0 g of calcium carbonate?

Chemistry
If a strong acid or base is dissolved in water, will all of its parts have the concentration? For example in Ca(OH)2 = Ca + 2OH if the concentration of Ca(OH)2 is 8.11x10^-3 M, would the concentrations of Ca and 2OH be the same? or in the case of OH, the concentration has to ...

CHEMISTRY
if the degree of dissociation of one molar monoprotic acid is 10 percent. calculate its Ka value?

Chemistry
Excess lead (II) nitrate solution is added to 1.30 g of zinc powder and the mixture is stirred. When the reaction is finished the lead formed is filtered, dried and weighted. It has a mass of 3.31 g. What is the percentage yield of the lead? Pb(NO3)2 + Zn -> Pb + Zn(NO3)2 A...

Chemistry
The relative molecular mass of calcium carbonate is 100. What is the minimum volume of 2.0 M hydrochloric acid that would be needed to completely react with 2.0 g of calcium carbonate? options are A) 20 cm^3 B) 10 cm^3 C) 5 cm^3 D) 30 cm^3 E) 40 cm^3 I wrote down what I ...

Organic Chemistry
Does Ethanoyl Chloride gives out a white precipitate with aqueous AgNO3? We've been thought that an acid chloride gives out the relative Carboxylic acid with water.So in the same way can we take that Ethanoyl Chloride reacts with the water in this aqueous solution to give out ...

Chemistry
Calculate the delta G of the reaction using the following information. 4HNO3+ 5N2H4 --> 7N2+ 12H2O Delta H(Kj/mol) -133.9 50.6 0 -285.8 Delta S(J/mol x K) 266.9 121.2 191.6 70.0

Chemistry
How do we order the following considering their acidic nature? 1)CH3COOH 2)Phenol 3)C6H5COOH 4)CH3C(triple bond)CH 5)a cyclic alcohol [ (CH2)5-CH-OH ] I know that Phenol is acidic than alcohols and Carboxylic acids are acidic than alcohols and the alpha H in the third compound...

chemistry
What is the balanced chemical equation and ingredients for brufen when reacts with HCL in the stomach

chemistry to @DrBob222
What is the reason for considering N2 has a boiling point lower than O2,because of its low molecular mass. Just curious about that old reason...

Chemistry - thermochemistry
Hydrogen gas (H2) is generated by the following reaction. Ca(s) + 2 HCl(aq) → CaCl2(aq) + H2(g); ΔH = −542.7 kJ/mol When this reaction takes place in a cylinder (fitted with a piston) containing 1.000 mol Ca(s), 542.7 kJ heat is lost to the surroundings. Because a gas is ...

Chemistry
We have been thought that BaC2O4 is a precipitate when dissolved in H2O. When comparing its solubilty in water and in an aqueous acidic solution,what is the reason for its higher solubility in an aqueous acidic solution than water?

Science - chemistry
Write the complete ionic equation for the reaction of magnesium phosphate with lead (II) nitrate. Include which ions will be aqueous and which compound will precipitate. (Valences: Mg=+2, PO4=-3, Pb=+2, NO3=-1)

Chemistry
In a qualitative analysis, the test for the presence of Cu^2+ ion is the formation of the bright blue complex ion Cu(NH3)42+. What is the equilibrium concentration of Cu2+ when 1.0 mL of 0.200 M Cu^2+ is combined with 1.0 mL of 15.0 M NH3? (Kf Cu(NH3)4^2+ = 5.0 x 10^12).

chemistry
AsH3 is more acidic than NH3 explane

Chemistry
Why N2(g) has a lower boiling point?

Chemistry
Please tell me how many bonds are in cucl2.4h2o and in CuSO4.5h20 and how cu+2 forms bonds in orbitals 4s,3d with cl2,so4. also please tell me 4h2o and 5h2o attachment in orbitals.

chemistry
while chloromethane is reactive towards nucleophiles, the Grignard reagent produced from chloromethane is reactive towards electrophiles. pl explain

Chemistry
What volume of O2 gas at STP is required to burn 32g of methane gas completely?

chemistry
sodium chloride has a molar mass of 58.4g/mole. how many grams of sodium chloride are needed to make 500.mL of a 0.0250 molar solution?

Analytic Chemistry
Barium Sulfate precipitated from a 1.300 sample was contaminated with 9.4 mg of Fe2(SO4)3 and weighed a total of 314.0 mg. Calculate the apparent % BaSO4 and True % BaSO4

Chemistry
When 20.0mL of 1.40M solution of calcium nitrate is mixed with 70.0mL of 0.234M potassium iodate, a precipitate Ca (IO3)2 is formed. Calculate the concentrations of both NO3- and IO3- before mixing and after mixing

Chemistry
When calcium iodate is added to water at 25 degrees Celsius, the equilibrium concentration of calcium ion was found to be 0.011M. Calculate the value of Ksp for this salt.

chemistry
while chloromethane is reactive towards nucleophiles, the Grignard reagent produced from chloromethane is reactive towards electrophiles. explain pl.

chemistry
why is soap produced from olive oil relatively hard and insoluble?

Chemistry
Consider the Unbalanced Reaction: Al2O3(s) + CO(g) → Al(s) + CO2(g) Estimate ∆G at 298 K if 7.1 moles of Al2O3(s) is reacted.

Chemistry
Frequency(v)=5×10to the power9 c=3×10to the power8 Wave length=c/v . . =3×10 8 /5×10 9 . . =?????

Chemistry
If 18oo cal:of heat is added to a system while system does work equivalent to 2800 cal:by expanding against its surroundings. What is the value of deltaE for the system?

Chemistry PLEASE HELP ME
Would a precipitate form if 200 mL of 0.006 M AgNO3 were added to 700 mL of a 0.005 M solution of K2CO3?

Chemistry
Write the net ionic equation for the precipitation of manganese(II) carbonate from aqueous solution:

Chemistry
Write the net ionic equation for the precipitation of iron(II) sulfide from aqueous solution:

Chemistry
Write the net ionic equation for the precipitation of zinc carbonate from aqueous solution:

Chemistry
You need to make an aqueous solution of 0.233 M magnesium nitrate for an experiment in lab, using a 125 mL volumetric flask. How much solid magnesium nitrate should you add? (fill in blank) __ grams

Chemistry
How many milliliters of an aqueous solution of 0.138 M potassium nitrate is needed to obtain 19.4 grams of the salt?

chemistry
How many grams of Al2(SO4)3 can be produced from 10.0g of CuSO4?

Chemistry
Which one of these properties is directly proportional to molality and why? A) Electrical conductance B) Heat of solution C) Equilibrium of solution D) Vapour pressure Thanks

Chemistry
Find active mass of 4gm of H2. Please solve it and explain it.

chemistry
At a given temperature, for a reversible reaction , if the concentration of reactants is doubled then the equilibrium costant will (a) be doubled (b) be halved (c) change to 1/3 (d) remaine same

Chemistry
How many meters are there in one picometer?

Chemistry
A dime is found to have a mass of 2.33 grams. Using unit analysis, show what the mass of this dime is in kilograms. 2.33 grams x ________ _______ (number) (unit) ________________________________________​________ ________ ________ (number) (unit) = ? ___ kg

Chemistry
Expressing amounts of energy in different energy units is necessary to solve many chemistry problems. For practice, complete the following table. FILL IN THE BLANKS PLEASE. The Joule (J) is the SI unit of energy. 1 calorie (cal) = 4.184 J J cal kJ 695 ___ ___ ___ 132 ___ ___ ...

chemistry
If Cl − is the only anion in the solution, what is the Cl − concentration in milliequivalents per liter?

Chemistry - Kinetic Molecular Theory
Question: What is the density (in g/L) of ethyne gas at 743 torr and 12.2°C? The unrounded molar mass of ethyne is 26.036 g/mol. I did some unit conversions, so 743 torr=0.97763 atm and 12.2°C=285.35°K I used the equation d=PMr/RT and I plugged in values to get d=(0.97763*...

Chemistry
Aldol condensation of formic acid will create?

chemistry
How many moles of methane are produced when 25.1 moles of carbon dioxide gas react with excess hydrogen gas

chemistry
HF reaction with MnO2 Explain why it is a redox reaction?

Chemistry
What is the reason for the higher ability of Fe3+ , than Fe2+, for being hydrolyzed? Does this has something to do with Fe3+ having higher electron density than Fe2+ ? And how are they related?

Chemistry
What would be more acidic? SO2 or SO3? Does this have to do something with the higher oxidation state? And why is that? Or can we say SO3 is more acidic by, SO2+H2O--->H2SO3 SO3+H2O--->H2SO4 as H2SO4 is more acidic?

Chemistry
Calculate the number of moles of solute in 497.2 L of 0.815 M sodium cyanide?

Chemistry
With which of the following AgNO3 makes a precipitate quickly? And what would be the reason? 1) C6H5Br 2)C6H5-CH2Br 3)(CH3)3-C-Br 4)C6H5-CH2-CHBr-C(triple bond)H 5)C6H5-CH2Br-CH=CH-CH3 I feel like that 1st one is most probably,not the answer as it is not very (reactive)and I ...

Chemistry
How to identify anions

Chemistry
Calculate the weight of anhydrous Na2CO3 necessary to prepare M/20 solution in 100cm3 volumetric flask

Chemistry
How much Na2CO3 would you weigh to prepare M/20 Na2CO3 solution in 100cm3 volumetric flask?

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Homework Help: Science