25,963 Answered Questions for the topic chemistry

Chemistry

07/16/24

Chemistry - Solution Stoichiometry

A 701- mL sample of unknown HCl solution reacts completely with Na2CO3 to form 12.1g CO2. What was the concentration of the HCl solution?
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Chemistry

07/11/24

How many Joules of heat are removed from 500 g of H2O when it is cooled from 190 C to -35C ?
How many Joules of heat are removed from 500 g of H2O when it is cooled from 190 C to -35C ? The specific heat of solid water is 2.09 J/g*C, liquid is 4.18 J/g*C, and gas is 2.02 J/g*C. The molar... more
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Chemistry Organic Chemistry

07/11/24

Chemistry 30- Molar Enthalpy and Combustion Question HELP!
A 5.00 g sample of nitromethane was burned in a calorimeter that contained 250 g of water at 20.5°C. Calculate the final temperature of the water if all 5.00 g of nitromethane is combusted. Hint -... more
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Chemistry

07/10/24

4 Gas Laws and Stoichiometry Questions
1.) A bacterial culture isolated from sewage produced 34.5 mL of methane, CH4, at 30.0 degrees C and749 mm Hg. What is the volume of methane at STP (0 degrees C, 760 mm Hg)?My work: (P1V1)/(T1) =... more
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Chemistry

07/10/24

Gas Laws/Stoichiometry Chemistry Questions
A gas has a volume of 450 mL at 35 degrees C. If the volume changes to 400 mL, what is the newtemperature (give your answer in C)?What volume of Hydrogen gas at STP may be prepared by the reaction... more
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Chemistry

07/08/24

A Riddle: What can you swallow and it can swallow?
This is a universal substance that everybody drinks.
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Chemistry

07/07/24

Write the balanced NET ionic equation for the reaction when AgC₂H₃O₂ and Ni(ClO₄)₂ are mixed in aqueous solution
Write the balanced NET ionic equation for the reaction when AgC₂H₃O₂ and Ni(ClO₄)₂ are mixed in aqueous solution
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Chemistry

07/05/24

Microliter conversion

How many microliters of solvent is needed for 0.1g, 0.05g, and 0.009g to have the same content of NaNO3? Also will 0.1g have more liquid solvent because it is the highest concentration?
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Chemistry

07/04/24

nitrate calculation

If I have different levels of sodium nitrate (0.1g, 0.05g, 0.009g) what are the calculations in order to make one concentrated stock solution? I know that the end number needs to be in... more
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Chemistry

07/01/24

Prepare a buffer solution
Calculate how you would prepare 1.000 l of a pH 10.25 buffer made from NH3 and NH4Cl. You are provided with 2.000 l of 3.00 M NH3 and 250 g NH4Cl solid. Kb= 1.75x10-5 . Assume that the addition of... more
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Chemistry

06/30/24

How much energy (in J ) is lost when a sample of iron with a mass of 28.5 g cools from 75.0 ∘C to 29.0 ∘C ?

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Chemistry

06/28/24

How long does it take a metal to oxidise to dust
I will like to know the most time it will take a metal to oxidise to dust.
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Chemistry

06/26/24

1) Write the hydrolysis reaction(s) for the salt, KClO, and determine if the solution is acidic, basic, or neutral.
2) A solution contains 0.020 M KClO, what is the pH of the solution? Ka (HClO) = 3.5x10-8
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Chemistry

06/24/24

Hi. I want to convert 500um to how many mcg. Thank you. Andy

Please convert 500 um to mcg. Thank you. Andy
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Chemistry

06/20/24

Solving for a reaction in solution

Suppose an industrial quality chemist analyzes a sample from a copper processing plant in the following way. He added powdered iron to a 150 ml copper ii sulfate sample from the plant until no more... more
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Chemistry

06/17/24

A water sample contains 5 mg SO42- per liter. What is the concentration in micromoles/L?
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Chemistry Organic Chemistry

06/17/24

In esterification RCOOH reacts with ROH in the presence of an acid giving H+. Why does H+ react with RCOOH when it is a better acid than ROH? Shouldnt H+ react with the better base??
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Chemistry

06/17/24

How many sodium ions are used if 2.3 moles of sodium iodide react completely?
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Chemistry

06/17/24

What is the osmotic pressure, in atm, of a 0.161 M solution of MgCl₂ at 37.0 °C? (assume complete dissociation).
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Chemistry

06/12/24

What is the concentration(in Molarity)
  H2SO4 + 2 Na(OH)      2H2O + Na2SO4Based on the above equation, calculate the concentration (in M) of a 49.1 mL solution of Na(OH) if 50.0 mL of 2.95 M H2SO4 is required to react completely.
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Chemistry Biochemistry

06/12/24

I need help with this!!
A custom peptide is generated that can be injected into the affected zombies and used to disrupt the beta sheet zombie form. This peptide is thought to form a 310 helix in healthy individuals. The... more
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Chemistry

06/10/24

General Chemistry
A cereal contains 11.0 grams of sucrose(C₁₂H₂₂O₁₁) per 60.0 grams of cereal. What mass in grams of cereal must be eaten to consume a total of 0.0424 moles of sucrose?
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Chemistry

06/10/24

Chemistry Homework
A 6.082 gram sample of an organic compound containing, and is analyzed by combustion analysis and 10.84 grams of and 4.438 grams of are produced.In a separate experiment, the molar mass is found to... more
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Chemistry

06/09/24

Chemistry Lewis Structure (Boron and Fluorine)
What is the correct Lewis Structure for BF2- ?I thought Boron was an exception to the Octet rule and that Fluorine could not be double bonded but I am not sure if that is correct.Is it boron with... more
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Chemistry

06/07/24

Express your answer to SCIENTIFIC NOTATION.
Iron has a density of 7.86 g/cm37.86 g/cm3 (1 cm3=1 mL1 cm3=1 mL). Calculate the volume (in dLdL) of a piece of iron having a mass of 4.26 kgkg . Note that the density is provided in different... more
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