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What are the differences between gel permeation chromatography and size exclusion chromatography, and how can these techniques be used to characterize polymers with different molecular weights and distributions?

asked Feb 13 in Polymer Chemistry by TitusTricket (210 points)

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1 answer 29 views

What is the structure and bonding of the metal complexes in gadolinium-based metallofullerenes, and how do they affect the magnetic properties of the compound?

asked Feb 13 in Coordination Chemistry by CNBDominique (210 points)

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How does the activation of G protein-coupled receptors (GPCRs) lead to the activation of downstream signal transduction pathways in biochemical terms?

asked Feb 13 in BioChemistry by ErnaPitt1143 (250 points)

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How do G protein-coupled receptors (GPCRs) initiate signal transduction pathways in cells and how can their activity be modulated by different allosteric ligands?

asked Feb 13 in BioChemistry by UTNDamien207 (170 points)

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How do G protein-coupled receptors (GPCRs) initiate signal transduction pathways in cells? Discuss the biochemical mechanism involved in the activation of GPCRs and the downstream signaling events that follow.

asked Feb 13 in BioChemistry by JolieTristan (370 points)

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How does the activation of G protein-coupled receptors (GPCRs) initiate signal transduction pathways in biochemistry, and what is the specific biochemical mechanism involved in this process?

asked Feb 13 in BioChemistry by BrandonBrewe (450 points)

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1 answer 25 views

What is the structural difference between furan and pyrrole, and what effect does this structural difference have on their chemical reactivity and physical properties? Provide specific examples of reactions and properties to support your answer.

asked Feb 13 in Organic Chemistry by LaraBosanque (170 points)

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1 answer 42 views

What is the primary difference between furan and pyrrole in terms of their aromaticity, and how does that affect their chemical reactivity?

asked Feb 13 in Organic Chemistry by SuzanneLaufe (230 points)

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1 answer 21 views

What is the mechanism of free radical polymerization of vinyl chloride and how does the reaction pathway lead to the formation of PVC with high molecular weight?

asked Feb 13 in Organic Chemistry by ChanaMedwort (270 points)

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What conditions are required for the successful synthesis of high molecular weight polypropylene using Ziegler-Natta catalysts from propylene monomer?

asked Feb 13 in Chemical synthesis by Krystle43G40 (370 points)

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How many geometric isomers can be formed for the square planar complex (PtCl₂(NH₃)₂)?

asked Feb 13 in Coordination Chemistry by EtsukoGunter (270 points)

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What conditions are needed for the catalytic polymerization of ethylene monomers in order to obtain high molecular weight polyethylene?

asked Feb 13 in Chemical synthesis by ChristalBeau (250 points)

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1 answer 34 views

What is the effect of doubling the concentration of reactant A on the initial rate of a second-order reaction having a rate constant of 0.002 M^-1s^-1 at a fixed concentration of reactant B?

asked Feb 13 in Chemical kinetics by OpheliaTuggl (510 points)

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What is the rate constant of a second-order reaction if its concentration is 0.5 M and its half-life is 5 minutes?

asked Feb 13 in Chemical reactions by ShaunteMcKim (330 points)

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What effect does varying the concentration of reactants have on the reaction rate for a reaction that follows a first-order reaction kinetics?

asked Feb 13 in Chemical kinetics by LashawnGoose (510 points)

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What is the rate constant for the reaction: A + B → C if the concentration of A is 0.1 M, B is 0.2 M, and the initial rate of formation of C is 2.5 x 10^-3 M/s? (Assume the reaction follows first-order kinetics with respect to both A and B.)

asked Feb 13 in Chemical kinetics by WoodrowLindg (350 points)

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1 answer 39 views

What is the reaction rate constant for the reaction A + B → C if the initial concentration of A is 0.2 M, the initial concentration of B is 0.3 M, the initial rate of reaction is 0.1 M/s, and the reaction is of first order with respect to both A and B?

asked Feb 13 in Chemical reactions by ArmandRolles (330 points)

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1 answer 19 views

What structural and electronic parameters are necessary for a metal ion to function as a cofactor in metalloenzymes and metalloproteins, and how do these factors affect the enzyme's catalytic activity?

asked Feb 13 in Coordination Chemistry by RaleighTearl (150 points)

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1 answer 45 views

What is the effect of changing the concentration of reactants on the reaction rate for a first-order reaction?

asked Feb 13 in Chemical kinetics by Gudrun21E556 (350 points)

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What is the rate constant for the decomposition of 2.00 mol/L of hydrogen peroxide (H2O2) at 25°C, given that the reaction follows first-order kinetics and the rate of decomposition is 0.050 mol/L·s?

asked Feb 13 in Chemical kinetics by MichaleSalis (350 points)

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