Questions by SelmaBumgarn

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1 answer 17 views

What is the optimal reaction temperature and reaction time required for the synthesis of polyvinyl chloride from vinyl chloride monomer with the highest possible yield and purity?

asked 4 days ago in Chemical synthesis

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1 answer 25 views

How does the molecular structure of conductive polymers affect their conductivity and mechanical properties, and how can this knowledge be applied to the design of more efficient and durable flexible electronic devices?

asked 4 days ago in Materials Chemistry

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1 answer 33 views

How does the surface modification of polymers affect their hydrophobicity and adhesion properties?

asked Feb 17 in Surface Chemistry

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1 answer 49 views

How does an increase in nutrient levels contribute to eutrophication in aquatic ecosystems, and what are the chemical processes involved? How can these chemical processes be harnessed to mitigate the effects of eutrophication on the environment?

asked Feb 13 in Environmental Chemistry

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1 answer 10 views

How can the production efficiency of surfactants be improved by designing an optimized system that enhances the mixing, heat transfer, and chemical reactions within the reactor?

asked Feb 10 in Chemical engineering

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1 answer 40 views

How can the efficiency of the production process for detergents be optimized while minimizing environmental impact?

asked Feb 7 in Chemical engineering

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1 answer 61 views

Here is a problem related to BET theory of multilayer adsorption for a chemistry student to solve:How many layers of nitrogen molecules can be adsorbed on the surface of a given amount of activated carbon if the monolayer coverage is 100 m²/g and the specific surface area of activated carbon is 1500 m²/g according to the BET theory?

asked Feb 4 in Surface Chemistry

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1 answer 46 views

Calculate the standard enthalpy change for the vaporization of 25.0 g of water at 100°C, given that the molar enthalpy of vaporization of water is 40.7 kJ/mol. (The molar mass of water is 18.015 g/mol.)

asked Feb 3 in Chemical thermodynamics

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1 answer 91 views

What actions can be taken by chemistry students and educators to address the limited availability of chemistry textbooks and resources in developing countries?

asked Jan 30 in Chemical education

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1 answer 43 views

Calculate the enthalpy change (in kJ/mol) for dissolving 10 grams of NaOH in 100 mL of water at 25°C, given that the molar heat of solution for NaOH is -444.6 kJ/mol.

asked Jan 23 in ThermoChemistry

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1 answer 55 views

A chemistry student needs to determine the standard enthalpy change for the formation of NH3(g) from its constituent elements, using Hess's Law calculations. The student is given the following information:ΔHf°(NH3) = -46 kJ/molΔHf°(N2) = 0 kJ/molΔHf°(H2) = 0 kJ/molΔH298°(N2H4) = 95 kJ/molΔHf°(N2H4) = 50 kJ/mol2NH3(g) + N2H4(l) → 3N2(g) + 4H2(g)What is the value of ΔHf° for NH3, based on the above data?

asked Jan 22 in ThermoChemistry

0 votes

1 answer 67 views

What is social action theory?

asked Jan 15 in Psychology

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1 answer 45 views

What is sexual dysfunction?

asked Jan 14 in Psychology

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1 answer 24 views

What is the difference between a feature detector and a complex cell?

asked Jan 14 in Psychology

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1 answer 32 views

What is the difference between a dialect and an accent?

asked Jan 14 in Psychology

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1 answer 42 views

Why is there very little evaporation in the boreal forests?

asked Jan 8 in Science

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1 answer 37 views

What would you need to see most cells?

asked Jan 8 in Science

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1 answer 35 views

What type of relationship is parasitism?

asked Jan 8 in Science

+2 votes

1 answer 31 views

What device detects and measuresee earthquake waves?

asked Jan 7 in Science

0 votes

1 answer 62 views

What is an element that tend to be malleable?

asked Jan 6 in Science

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