Questions by CherylDooley

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1 answer 32 views

How do the rheological properties of polymer melts vary with changes in temperature and molecular weight?

asked Feb 24 in Polymer Chemistry

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1 answer 38 views

What reaction occurs between sodium and chlorine to produce sodium chloride and what is the balanced chemical equation for this synthesis reaction?

asked Feb 22 in Chemical reactions

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1 answer 78 views

How does the chemical structure and composition of polymer-based packaging materials affect their biodegradability and environmental impact?

asked Feb 18 in Polymer Chemistry

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1 answer 73 views

How can the properties of graphene be modified to improve its suitability for electronic device applications, such as improving its conductivity or stability? Specifically, what chemical modifications, if any, can be made to the graphene structure to enhance its performance in electronic devices? How do these modifications affect the overall properties of graphene and its potential use in various electronic applications?

asked Feb 10 in Materials Chemistry

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1 answer 96 views

Given the reactants Copper(II) chloride and Sodium hydroxide, predict the products of the reaction and write the balanced chemical equation.

asked Feb 4 in Inorganic Chemistry

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1 answer 141 views

Determine the heat of hydration, in kJ/mol, for the reaction between solid Calcium chloride (CaCl2) and water (H2O), given that 1 mole of CaCl2 dissolves to produce 3 moles of ions and releases -82.8 kJ of heat in the process.

asked Feb 4 in ThermoChemistry

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1 answer 77 views

Calculate the standard enthalpy change for the following reaction at 25°C given the enthalpies of formation (in kJ/mol) of the compounds involved:CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)Hf(CaCO3) = -1206.9 kJ/molHf(CaCl2) = -795.8 kJ/molHf(CO2) = -393.5 kJ/molHf(H2O) = -285.8 kJ/molHf(HCl) = -92.31 kJ/mol

asked Feb 3 in Chemical thermodynamics

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1 answer 73 views

Calculate the enthalpy change when 2 moles of nitrogen gas are adsorbed onto the surface of activated charcoal at a temperature of 298 K, given that the pressure of nitrogen is 1 atm and the final pressure of nitrogen adsorbed is 0.5 atm. The standard enthalpy of formation of nitrogen gas is 0 kJ/mol.

asked Jan 23 in ThermoChemistry

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1 answer 35 views

What are the main ethical issues to consider when using animals in research?

asked Jan 20 in Psychology

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1 answer 45 views

According to the social cognitive theory, how can modeling influence behaviour?

asked Jan 20 in Psychology

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1 answer 42 views

When treating mental illness, why is it important to consider the individual's cultural background?

asked Jan 17 in Psychology

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1 answer 51 views

What is the difference between hearing and listening?

asked Jan 16 in Psychology

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1 answer 106 views

How does a schema influence attention?

asked Jan 14 in Psychology

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1 answer 54 views

What is the survey method?

asked Jan 13 in Psychology

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1 answer 90 views

Which part of the brain secretes hormones that tell the pituitary gland either to secrete or to stop secreting its hormones?

asked Jan 8 in Science

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1 answer 77 views

What type of machines generally have lower efficiency but greater mechanical advantage?

asked Jan 8 in Science

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1 answer 94 views

What is the type of cell division that produces gametes?

asked Jan 7 in Science

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1 answer 67 views

What is the only metal that is a liquid at room temperature?

asked Jan 7 in Science

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1 answer 124 views

Tar sands are rocky materials mixed with what?

asked Dec 31, 2024 in Science

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1 answer 70 views

Deoxyribonucleic acid (dna) is nucleotide that stores what type of information?

asked Dec 30, 2024 in Science

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