Answers by JoannKinne38

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What is the relationship between surface tension and temperature as measured by the pendant drop method?

answered 1 day ago in Surface Chemistry

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20 views

What is the effect of different solvents (water, ethanol, and acetone) on the rate of the chemical reaction between sodium hydroxide and hydrochloric acid?

answered 3 days ago in Chemical kinetics

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19 views

How does the presence of heavy metals in contaminated soil affect the growth and development of crops, and what are the possible ways to mitigate their negative impact on agriculture?

answered 3 days ago in Environmental Chemistry

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21 views

What is the optimal reaction conditions and yield for the preparation of 2,4-dichloronitrobenzene from nitrobenzene and chlorine gas through the process of chemical synthesis?

answered 3 days ago in Chemical synthesis

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21 views

How does the photochemical behavior of transition metal complexes vary with changes in the ligand structure? Compare and contrast the photochemical properties of a series of transition metal complexes with different ligands.

answered 3 days ago in PhotoChemistry

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21 views

How does the formation of a passive layer on the surface of a metal prevent corrosion, and what factors influence the formation of this layer?

answered 5 days ago in Surface Chemistry

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25 views

What is the effect of concentration on the rate of reaction between sodium thiosulfate and hydrochloric acid and how does it affect the efficiency of the reaction?

answered 5 days ago in Chemical kinetics

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40 views

How does the change in reactant orientation affect the rate of the chemical reaction between magnesium and hydrochloric acid, and how can this be investigated?

answered Feb 18 in Chemical kinetics

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21 views

What is the balanced chemical equation for the reaction of hydrochloric acid (HCl) with sodium bicarbonate (NaHCO3) and what gas is evolved during the reaction?

answered Feb 17 in Chemical reactions

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36 views

What are the mechanisms responsible for the phosphorescent properties of certain materials and how can we utilize this knowledge to design more efficient phosphorescent materials for use in various applications?

answered Feb 14 in PhotoChemistry

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37 views

How can the yield of fragrances be improved in the production process while minimizing the formation of impurities and maximizing safety for workers and the environment?

answered Feb 13 in Chemical engineering

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42 views

How can the photochemical properties of phosphorescent materials be modified to enhance their efficiency as photovoltaic materials in solar cells?

answered Feb 10 in PhotoChemistry

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39 views

Determine the bond dissociation energy of methane (CH4) using the following data: Reaction: CH4(g) → C(g) + 4H(g)ΔH°f (kJ/mol): CH4(g) = -74.81C(g) = 715.32H(g) = 218.00Hint: bond dissociation energy can be calculated using the formula ΔH°rxn = Σ (ΔH°f, products) - Σ (ΔH°f, reactants)

answered Feb 4 in ThermoChemistry

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68 views

Design a polymerization reaction scheme to synthesize a biodegradable and water-soluble polymer for use in environmentally friendly packaging materials.

answered Feb 4 in Organic Chemistry

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52 views

Design a chemical reactor to produce 500kg of ammonia per hour from hydrogen and nitrogen gases. You are given the rate equation for the reaction as follow: N2(g) + 3H2(g) → 2NH3(g) The reaction is exothermic and a temperature range of 400-500°C is recommended for optimal production rate. The pressure of the system should be between 150-200 atm. You are required to determine the required size of the reactor and the flow rates of hydrogen and nitrogen gas.

answered Feb 3 in Chemical engineering

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54 views

Calculate the weight-average molecular weight of a polymer sample with the following information:- The polydispersity index (PDI) of the sample is 1.5.- The number-average molecular weight (Mn) of the sample is 20,000 g/mol. - The weight fraction (w) of the polymer with a molecular weight of 30,000 g/mol is 0.2, and the weight fraction of the polymer with a molecular weight of 10,000 g/mol is 0.8.

answered Feb 3 in Physical Chemistry

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62 views

What is the role of carnitine in lipid metabolism and how does its deficiency lead to lipid storage disorders?

answered Jan 31 in BioChemistry

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78 views

What is the amount of copper ions present in a 1.0 mL sample of copper sulfate solution, when a current of 3.0 A for 10 seconds is used for coulometry analysis, assuming 100% efficiency in electrode reactions and a coulombic efficiency of 90%?

answered Jan 30 in Analytical Chemistry

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66 views

Calculate the heat capacity of 10 grams of water at 25°C if it requires 500 joules of heat to raise its temperature by 5°C.

answered Jan 23 in Chemical thermodynamics

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54 views

Calculate the corrosion rate of a copper wire of diameter 0.5 cm and length 20 cm when immersed in a solution containing 1M HCl for 24 hours. The initial and final weights of the wire were 6.0 g and 5.6 g, respectively. The density of copper is 8.96 g/cm³. What is the corrosion rate of the copper wire in mm/year?

answered Jan 23 in ElectroChemistry

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