Recent activity by LesleyStyers

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Calculate the standard enthalpy change for the vaporization reaction of 2.00 moles of water at 100°C and 1 atm pressure, given that the molar enthalpy of vaporization of water is 40.7 kJ/mol.

answered 2 days ago in Chemical thermodynamics

1 answer 31 views

How does the chemical structure of aspirin contribute to its pharmacodynamics in the body?

answered 5 days ago in Medicinal Chemistry

1 answer 34 views

How does adding a strong acid or base affect the pH and equilibrium concentration of a weak acid or base such as acetic acid in a solution and how can we predict these changes using the equilibrium constant expression?

asked 5 days ago in Chemical equilibrium

1 answer 53 views

How can the concentration of a particular metal ion in a given sample be quantified using voltammetry and what are the factors that affect the accuracy of the measurement?

answered Jan 29 in Analytical Chemistry

1 answer 52 views

Calculate the Heat of Sublimation of iodine (I2) if 20.0 grams of iodine sublimate at standard temperature and pressure (STP) from a solid to a gas phase absorbing 62.30 kJ of heat energy in the process.

answered Jan 23 in ThermoChemistry

1 answer 47 views

Calculate the enthalpy change for the isomerization of butene-1 to butene-2 given that the heat of combustion of butene-1 and butene-2 are -2874 kJ/mol and -2854 kJ/mol respectively. Assume all reactants and products are in the gaseous state and that the reaction is carried out at constant pressure.

asked Jan 23 in ThermoChemistry

1 answer 46 views

Calculate the bond length between two oxygen atoms in an O2 molecule, given that the O-O bond energy is 498 kJ/mol and the reduced mass of the system is 15.9994 g/mol.

asked Jan 23 in Chemical bonding

1 answer 40 views

A chemistry student wants to measure the zeta potential of a colloidal solution. The student has chosen the appropriate instrument, but needs to determine the optimal pH range for the solution in order to obtain accurate and meaningful results. What is the recommended method to determine the optimal pH range for measuring the zeta potential of a colloidal solution, and how can the student ensure accurate and reliable measurements using this method?

asked Jan 22 in Surface Chemistry

1 answer 27 views

Where was the Rosenthal-Jacobson Pygmalion Effect study conducted?

answered Jan 20 in Psychology

1 answer 31 views

Why is it important to establish a causal relationship before making conclusions?

answered Jan 20 in Psychology

1 answer 41 views

Where does explanatory power fit in theory evaluation?

asked Jan 16 in Psychology

1 answer 21 views

According to the Social Cognitive Theory, what is the role of observation in learning new health behaviours?

answered Jan 16 in Psychology

1 answer 21 views

What is the role of the amygdala in emotion?

answered Jan 15 in Psychology

1 answer 17 views

What is a grief counselor?

answered Jan 14 in Psychology

1 answer 25 views

What sort of gas is found in balloons and blimps, and is used to make them float in the sky?

asked Jan 7 in Science

1 answer 54 views

What part of the body do fish use to absorb oxygen?

asked Jan 7 in Science

1 answer 21 views

What do you call any substance that opposes coagulation?

asked Jan 6 in Science

1 answer 43 views

Silver, gold, and copper all conduct what very well?

asked Dec 31, 2024 in Science

1 answer 59 views

Sepals, petals, pistils, and stamens are contained in all what, which are actually modified leaves or sporophylls organized around a central stalk?

asked Dec 31, 2024 in Science

1 answer 20 views

Light is energy that travels in the form of what type of wave?

answered Dec 31, 2024 in Science

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