25,963 Answered Questions for the topic chemistry

02/08/25

Chemistry Kinetics
The reactionH2 (g) + Br2 (g) -> 2HBr (g)is first order in both H2 and Br2, withk=7.61x10^-4 L/mol*sat 291 °C. If 1.00 L of at a concentration of 0.0584 M is rapidly mixed with the same volume of... more
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Chemistry

02/07/25

If 88 g of NaCl reacted with an unknown amount of Ca(OH)2 and 95 g of NaOH was produced with 170 g of CaCl2, how many grams of Ca(OH)2 was reacted?
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Chemistry

02/07/25

Chemical Kinetics - Decomposes in a First-order Reaction
At 1000 degrees Celsius cyclobutene C4H8 decomposes in a first order reaction, with the very high-rate constant of 87 s-1 to two molecules of ethylene C2H4. a) the initial C4H8 concentration if... more
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Chemistry

02/02/25

Chemistry quistion
If the final temperature of the water and metal is 58.5 ∘C, what is the specific heat of the metal?    Express your answer in J/(g⋅∘C) using three significant figures.
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Chemistry

02/02/25

Chemistry Tutor
My daughter used Dr. Patrick V. last year - his profile seems to be up but there is no way to message him (empty page). Is he still tutoring Chemistry
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Chemistry

01/29/25

Please explain the bonding in a 2+2 cyclodaddtion with only one excited electron.
The photochemical 2 + 2 cycloaddition involves 1 electron in an excited pi* orbital of one alkene with an empty pi* orbital of the other ground state alkene. This gives the correct orbital overlap,... more
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Chemistry

01/27/25

Propane gas (C3H8) reacts with Oxygen in a combustion reaction, producing Carbon dioxide and water.

A) Write and Balance the following Word Equation: B) Using your balanced equation above, answer the following questions: in t chart belowHow many moles of Oxygen gas are necessary to react with... more
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Chemistry Biochemistry

01/23/25

I need help with these questions!!
This particular sequence of DNA encodes the peptide N’-PRANCED-C’:1.). If the pKa values of this fragment are 12.48, 4.07, 3.90, 2.20, 10.70 (N-terminus), 8.37 calculate the pH where you are most... more
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Chemistry

01/22/25

intro chemistry

You are on the management team of a company that is considering purchasing a tanker truck. The truck you want has a volume of 26,000 liters and an empty mass/weight of 15,500 kg. However, the route... more
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Chemistry

01/20/25

Chemistry 100 level - Element X
Element X is powerful enough to reduce sodium ions to sodium metal. Barium is a strong enough reducing agent to reduce X. What is the identity of X?I wrote K(S) or C(S), but my professor marked the... more
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Chemistry

01/20/25

Chemistry 100 level
What is the oxidation number of S in NH4H2SO4?My professor says the right answer is +5, but Chat GPT says the right answer is +6, and she doesn't include +6 as one of the multiple choice options.... more
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Chemistry

01/11/25

In a rare moment of carelessness, Ardy Brickfuss sprinkles 4.26 x 1022 molecules of sucrose (C12H22O11) on his breakfast cereal. Calculate the mass of sucrose involved in this blunder.
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Chemistry Organic Chemistry

01/11/25

What is the primary difference between an ionic bond and a covalent bond?
Choose the correct option describing the primary difference between an ionic and covalent bond.Options: Ionic bonds involve the sharing of electrons, while covalent bonds involve the transfer of... more
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Chemistry

01/09/25

How can i get my past tutoring sessions back?
I need to review the sessions for chem 1 I paid a lot of money I really need to review them!
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Chemistry

01/08/25

Volume of A Drop: Water Volume 30.0 ML Number of Drops =19
Water Volume= ? Number of Drops = 19Average Drop Volume = ?Volume of irregularly shaped objectsInitial water volume (mL): Metal nut: Die: ... more
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Chemistry

01/07/25

Calculate the pressure of 1.33 mol of argon gas in a 6.33 L container at 200°C using the van der waals equation
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Chemistry

01/02/25

How do you find final temperature

The molar enthalpy of combustion for methane (CH4) is –2242.0 J/mol. 0.50 g of methane is used to heat 45.0 mL of water at 24.0°C. What is the final temperature of the water (assuming perfect heat... more
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Chemistry Biochemistry

12/22/24

I need help with these questions!!
1.) Suppose trypsin lowers the standard enthalpy (∆Ho҂) of the transition state by 4.8 kcal/mol and increases the standard entropic favorability (∆So҂) of the transition state by 20 cal/mol*K. What... more
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Chemistry

12/12/24

Need Help Please
For the cell shown, the measured cell potential, 𝐸 cell is -0.3625 V at 25 °cPt(s) | H2(g,0.721 atm) | H+(aq,? M) || Cd2+(aq,1.00 M) | Cd(s)The balanced reduction half-reactions for the cell, and... more
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Chemistry

12/10/24

Phase Transition Chemistry - Determine Boiling Point
Determine the normal boiling point of a substance whose vapor pressure is55.1 mm Hg at 35°C and has a ΔHvap of 32.1 kJ/mol.
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Chemistry

12/09/24

Why do so many terms in our language have more than one meaning?
It frequently seems like words have too many meanings for my child to understand when they are acquiring new vocabulary. How can we determine which contemporary usage of the word is correct?... more
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Chemistry

12/08/24

Buoyant force (Archimedes's principle)
If an object is more dense than the oil but less dense than the water, will the object sink deeper in oil or water?
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Chemistry

12/07/24

Partial Pressure in a Flask

A rigid 9.45 L flask contains a mixture of 1.50 moles of O2, 0.500 mole of N2 and sufficient Ar so that the partial pressure of Ar in the flask is 2.60 atm. The temp is 80 degrees C. total pressure... more
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Chemistry

12/07/24

Unknown gas diffusion
A sample of an unknown gas takes 434 s to diffuse through a porousplug at a given temperature. At the same temperature, N2(g) takes 175 sto diffuse through the same plug. What is the molar mass of... more
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Chemistry

12/07/24

Root Mean Square Speed of Helium
At what temperature in kelvin is the root mean square speed of heliumatoms (atomic weight = 4.00) equal to that of oxygen molecules (molecularweight = 32.00) at 300. K?Please include all steps.
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