Questions by BernadineRei

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1 answer 24 views

How can the sensitivity of SERS be enhanced for the efficient detection and analysis of low-concentration analytes on surfaces?

asked 17 hours ago in Surface Chemistry

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1 answer 41 views

Calculate the standard enthalpy change for the reaction of the coordination compound Cu(NH3)4SO4 with excess NaOH to form Cu(OH)2(s), NH3(g), Na2SO4(aq), and H2O(l) at a constant pressure of 1 atm and a temperature of 25°C.

asked Feb 3 in Chemical thermodynamics

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1 answer 38 views

Calculate the standard enthalpy change (ΔH°) for the following reaction involving the coordination compound [Fe(H2O)6]2+:[Fe(H2O)6]2+(aq) + 2Cl-(aq) → [FeCl2(H2O)4](aq) + 2H2O(l) Given: ΔH°f [FeCl2(H2O)4](aq) = -334 kJ/mol ΔH°f [Fe(H2O)6]2+(aq) = -393 kJ/mol ΔH°f H2O(l) = -286 kJ/mol Note: The superscript ° denotes standard conditions (i.e. 1 atm and 25°C) and the superscript f denotes standard enthalpy of formation.

asked Feb 3 in Chemical thermodynamics

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1 answer 47 views

What are the common functional groups present in alcohols and how do they affect the chemical properties of alcohols? Provide examples of reactions that alcohols undergo due to the presence of functional groups.

asked Jan 31 in Organic Chemistry

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1 answer 63 views

A chemistry student wants to find out the effect on the equilibrium position when the volume of a reaction mixture is changed. They have an equilibrium mixture of hydrogen and iodine gases forming hydrogen iodide gas according to the equation:$$H_2 (g) + I_2 (g) \leftrightharpoons 2HI (g)$$At 298 K, the equilibrium constant for this reaction is 54.3. Initially, the reaction mixture contains 0.5 moles of hydrogen gas, 0.5 moles of iodine gas, and 0 moles of hydrogen iodide gas in a container of volume 2L. If the volume is reduced to 1L while maintaining the temperature at 298 K, what wi

asked Jan 22 in Chemical equilibrium

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1 answer 43 views

What is never lost and just changes forms?

asked Jan 6 in Science

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1 answer 26 views

What is another term for hydraulic fracturing?

asked Jan 6 in Science

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1 answer 25 views

The various sensory organs are part of what organ system?

asked Jan 2 in Science

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1 answer 27 views

All chemical changes involve a transfer of what?

asked Dec 30, 2024 in Science

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1 answer 11 views

Unlike theories, which are proved true, what are often falsified?

asked Dec 27, 2024 in Science

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