1,698 Answered Questions for the topic biochemistry

03/12/21

Equilibrium concentrations

The equilibrium constant, Kc, for the following reaction is 55.6 at 698 K.H2 (g) + I2 (g)  2 HI (g)Calculate the equilibrium concentrations of reactants and product when 0.333 moles... more
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Biochemistry

03/12/21

Biochemistry Homework

Which of the following is responsible for nucleophilic attack on the substrate during the reaction catalyzed by Trypsin? The positively charged side chain of Histidine. The negatively charged... more
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Biochemistry Science Biology Physics

03/12/21

4. Plants heterozygous for a characteristic that determines petal colour were crossed (AB × AB)
The A allele represents a red phenotype, and the B allele represents a white phenotype. Work out the genotypic numbers if:a. This is an F1 cross. The results will be one AA to two AB to one BB. b.... more
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03/10/21

Equalibrium Concentrations

The equilibrium constant, Kc, for the following reaction is 1.80×10-4 at 298 K.NH4HS(s) NH3(g) + H2S(g)Calculate the equilibrium concentration of H2S when 0.390 moles of NH4HS(s) are introduced... more
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03/10/21

Equilibrium calculations
The equilibrium constant, Kc, for the following reaction is 83.3 at 500 K.PCl3(g) + Cl2(g) PCl5(g)Calculate the equilibrium concentrations of reactant and products when 0.282 moles... more
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03/10/21

Calculating K from Rearranged equations
The equilibrium constant, Kc, for the following reaction is 1.95×10-2 at 731 K.2HI(g) H2(g) + I2(g)Calculate Kc at this temperature for the following reaction:HI(g) 1/2H2(g) + 1/2I2(g)Kc = 
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03/10/21

Calculate K for Rearranged equations
The equilibrium constant, Kc, for the following reaction is 11.5 at 345 K.2CH2Cl2(g) CH4(g) + CCl4(g)Calculate Kc at this temperature for the following reaction:1/2CH4(g) + 1/2CCl4(g) CH2Cl2(g)Kc = 
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03/10/21

Manipulating K Expressions
Consider the reaction:C(s) + O2(g)CO2(g)Write the equilibrium constant for this reaction in terms of the equilibrium constants, Ka and Kb, for reactions a and b below: a.) C(s) + 1/2... more
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03/08/21

How much water do we lose per day?
i need help with this question
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Biochemistry Biology Microbiology

03/08/21

pGLO transformation
Hi!I did a lab about pGLO transformation, and in the instructions, it is said that the heat shock must last for exactly 50 seconds. But why is time so important here?
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03/05/21

Phosphate Buffer Preparation :Describe how would you prepare a phosphate buffer solution (100.0 mL, 0.100 M, pH 7.00)?
H2PO4− (aq) + H2O (l) ⇌ HPO42− (aq) + H3O+ (aq) pKa2 = 7.20Question: Describe how would you prepare a phosphate buffer solution (100.0 mL, 0.100 M, pH 7.00)? Available Stock Solution: Concentrated... more
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03/04/21

Calculate K from Equilibrium

The equilibrium constant, Kc, for the following reaction is 10.5 at 350K.2CH2Cl2(g) CH4(g) + CCl4(g)If an equilibrium mixture of the three gases in a 19.4 L container at 350K contains 0.372 mol... more
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03/04/21

Calculate K from Equilibrium

The equilibrium constant, Kc , for the following reaction is 7.00×10-5 at 673 K.NH4I(s) NH3(g) + HI(g)If an equilibrium mixture of the three compounds in a 6.70 L container at 673 K... more
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Biochemistry Chemistry Buffer Solution

03/04/21

from a 100mL prepared buffer, only 20mL was used for the addition of a strong acid or base. will the taken 20mL still represents the same moles as the originally prepared buffer solution?
Will the moles of the obtained 20mL buffer from the originally prepared 100mL buffered solution have the same moles or will they be different? What I am sure of is that the concentration of the 2... more
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03/03/21

What kinetic energy, 𝐸k , must the electrons have in order to resolve a protein molecule
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy ,𝐸k, must the electrons have in order to resolve a... more
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03/03/21

Maximum mass of an object
Assuming that the smallest measurable wavelength in an experiment is 0.430 fm, what is the maximum mass of an object traveling at 913 m⋅s−1 for which the de Broglie wavelength is observable?
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03/01/21

A sample of ethanol, C2H6O, has a mass of 21.50 g. Calculate the number of ethanol molecules in the sample.
Please Help I really indeed need help with this question!!! Like I got the number of moles of the ethanol being 0.46 but then I get confused from there.
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Biochemistry

02/28/21

Mechanism of coenzyme

mechanism of action of FMN
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Biochemistry

02/28/21

Amino acids converted

is serine converted to oxalacetates?If so how does it happen,if not why not
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Biochemistry

02/28/21

Amino acids degradation

show the path of serine degradation to CO2 H2O and urea
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02/24/21

Arrhenius Equation
The activation energy for the gas phase decomposition of ethyl chloroformate is 123 kJ.ClCOOC2H5C2H5Cl + CO2The rate constant at 462 K is 5.91×10-4 /s. The rate constant will be _____  /s... more
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02/24/21

Arrhenius equation
The activation energy for the gas phase isomerization of dimethyl maleate is 111 kJ.cis-CH3OOCCH=CHCOOCH3trans-CH3OOCCH=CHCOOCH3The rate constant at 713 K is 9.77×10-4 /s. The rate constant will... more
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02/24/21

Mechanisms: 2nd step
The following mechanism for the gas phase reaction of nitrogen dioxide with carbon monoxide at temperatures above 225 oC is consistent with the observed rate law......step 1.....fast:......NO2 +... more
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02/24/21

Concentration of sulfuric acid after neutralization
Write the balanced neutralization reaction that occurs between H2SO4 and in KOH aqueous solution. Phases are optional.Suppose 0.250 L of 0.500 M of H2SO4 is mixed with 0.200 L of 0.240 M KOH. What... more
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02/24/21

Chemistry: Mechanisms
A student proposed the following mechanism for the gas phase reaction of fluorine with chlorine dioxide......step 1.....fast:......2 ClO2  Cl2O4.....step 2.....slow:....Cl2O4 + F2  2 FClO2(1) What... more
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