25,963 Answered Questions for the topic chemistry

Chemistry

09/27/23

At 423K, this reaction has a Kc value of 0.0659.

At 423K, this reaction has a Kc value of 0.0659. X(g)+Y(g)—><— 2Z(g). Calculate Kp at 423K. Note that the pressure is units of atmosphere(atm)
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Chemistry

09/27/23

Which of the four reactions below will occur (select all that apply)?
Pt(s) + 2H+(aq) → Pt2+(aq) + H2(g)Ni(s) + 2H+(aq) → Ni2+(aq) + H2(g)Sn2+(aq) + H2(g) → Sn(s) + 2H+(aq)2NaF(aq) + I2(g) → 2NaI(aq) + F2(g)3Ni2+(aq) + 2Au(s) → 3Ni(s) + 2Au3+(aq)
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Chemistry

09/26/23

A solution is made of 2.05g of sucrose [C12H22O11] dissolved in 9.87g of water . Calculate freezing and boiling points of sucrose solution
Show work step by step for easy understanding
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Chemistry

09/26/23

what liquids would cause a re usable thermal liquid
I am a business student at Kendal college doing a project and I am wondering how I can create a self heating cup using an exothermic reaction.
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Chemistry

09/26/23

40.0 L at a pressure of 352 torr . If the pressure changes to 1760 torr , with no change in the temperature or moles of gas, what is the new volume, V2 ?
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Chemistry

09/26/23

At 25 degrees Celsius, NO2 and N2O4 exist in the following equilibrium. Find the equilibrium pressure of N2O4 if Pno2=1.9 atm
2NO2(g)=N2O4
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Chemistry

09/26/23

Kinetics chemistry
A substance decays with zero order kinetics. What is the half-life given a rate constant that is 0.737 M^-1s^-1 and an initial concentration of 1.75 M? How much of the substance remains after 22.5... more
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Chemistry

09/26/23

Calculate the value of Kp for the equation: C(s)+CO2(g)=2CO(g)
Given that at a certain temperature C(s)+2H2O(l)=CO2(g)+2H2(g) Kp1=3.05H2(g)+CO2=H2O(l)+CO(g) Kp2=0.621
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Chemistry

09/26/23

Kinetics order chemistry
A first order reaction has a half-life of 26.41 seconds. How long does it take for the concentration of the reactant in the reaction to fall to 63.25% of its initial value? How long does it take... more
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Chemistry

09/26/23

Complete and balance the precipitation reactions. Include physical states. Refer to the solubility rules as necessary.
Complete and balance the precipitation reactions. Include physical states. Refer to the solubility rules as necessary.precipitation reaction:K3PO4(aq)+MgCl2(aq)⟶
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09/25/23

Biochemistry HW QUESTION-I am stuck! Please help!
Indicate which of the amino acid residues in the following peptide sequence contains a group that has a negative charge for its most likely charge state at pH 10.Thr-Glu-Trp-Lys-Ser-Asn-Ile-Gly-Gln
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Chemistry

09/25/23

What is the maximum number of electrons that can be identified with the following set of quantum numbers? n=4, l=0, ml=0, ms=+1/2
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Chemistry

09/24/23

Identify which sets are valid and classify the others, by the rule or principle that is violated.
The following sets of quantum numbers listed in the order in, lb, ML, and Ms were written, for the last electrons added to an atom. Identify which sets are valid and classify the others, by the... more
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Chemistry

09/24/23

A mixture of 0.5540 M CO and 0.3810 M Cl, is enclosed in a vessel and heated to 1000 K.
A mixture of 0.5540 M CO and 0.3810 M Cl, is enclosed in a vessel and heated to 1000 K.CO(g) + Cl2 (g) - COCI2 (g)K. = 255.0 at 1000 KCalculate the equilibrium concentration of each gas at 1000... more
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Chemistry

09/22/23

If a balloon filled with air has a volume of 15.0 L at 25.0°C, what is its volume (in L) at -100.0°C?

 If a balloon filled with air has a volume of 15.0 L at 25.0°C, what is its volume (in L) at -100.0°C? 
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Chemistry

09/22/23

Chemistry second order kinetics

Consider the equation; NO2< O2 + NOif the reaction proceeds at second order kinetics and has half-life of 100.0 seconds. If the reaction is carried out at some temperature and the initial... more
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Chemistry

09/21/23

Fill in the left side of this equilibrium constant equation
Fill in the left side of this equilibrium constant equation for the reaction of phosphoric acid (H3PO4) with water.__ = Ka
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Chemistry

09/21/23

Calculate the acid dissociation constant Ka of benzoic acid.

The pH of a 0.66 M solution of benzoic acid (HC6H5CO2) is measured to be 2.19. Calculate the acid dissociation constant Ka of benzoic acid. Round your answer to 2 significant digits.Ka=
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Chemistry

09/21/23

Calculate the pH of a 1.4 solution of allantoin at 25 C.
The base protonation constant Kb of allantoin (C4H4N3O3NH2) is 9.12 x 10-6. Calculate the pH of a 1.4 solution of allantoin at 25 C. Round your answer to  1 decimal place.pH =
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Chemistry

09/21/23

Calculate the pH of a 2.6M solution of hydrocyanic acid.

The acid dissociation constant Ka of hydrocyanic acid (HCN) is 6.2 x 10-10. Calculate the pH of a 2.6M solution of hydrocyanic acid. Round your answer to 1 decimal place. pH =
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Chemistry

09/21/23

Calculate the volume of concentrated hydrobromic acid

A chemist must prepare 750.0 mL  of hydrobromic acid solution with a pH of 1.50 at 25 C.He will do this in three steps: Fill a 750.0 mL volumetric flask about halfway with distilled water. Measure... more
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Chemistry

09/21/23

Calculate the pH of the solution.
A chemist dissolves 159. mg of pure barium hydroxide in enough water to make up 80. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 C.)Round your answer... more
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Chemistry

09/21/23

Calculate the pH of the solution. (The temperature of the solution is  25 C.)
A chemist dissolves 752. mg of pure sodium hydroxide in enough water to make up 180. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 C.)Round your answer... more
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Chemistry

09/21/23

Calculate the pH of the solution
A chemist dissolves 836. of pure nitric acid in enough water to make up 350. mL of solution. Calculate the pH of the solution. Round your answer to 3 significant decimal places. 
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Chemistry

09/21/23

The following is a thermochemical question for the combustion of 1-pentene where environment conditions are at 15.4°C.
2C5H10(l) + 15O2(g) → 10H2O(g) + 10CO2(g) + 6318kJIf 15MJ of energy were to be released in the process of burning 1-pentene, what mass ofthe fuel was used?
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