Recent activity by ChristinaPae

1 answer 24 views

Calculate the standard enthalpy change for the formation of ethylene glycol (C2H6O2) from its elements given that the standard enthalpies of formation of carbon dioxide, water, and ethylene glycol are -393.5 kJ/mol, -285.8 kJ/mol, and -421.1 kJ/mol respectively.

answered 2 days ago in Chemical thermodynamics

1 answer 29 views

How does changing the number of unpaired electrons in a molecule affect its magnetic properties, and how can these changes be calculated using quantum chemistry methods?

asked 2 days ago in Quantum Chemistry

1 answer 55 views

What steps can be taken to increase awareness about the importance of safety protocols in chemistry labs among students and faculty members to prevent accidents and ensure safe laboratory practices?

asked 6 days ago in Chemical education

1 answer 40 views

Calculate the entropy change for the following chemical reaction at 25 °C: 2H2(g) + O2(g) → 2H2O(l) Given that the standard molar entropy of H2(g), O2(g), and H2O(l) are 130.68 J/mol·K, 205.03 J/mol·K and 70.01 J/mol·K respectively.

asked Jan 23 in Chemical thermodynamics

1 answer 46 views

A chemical engineer needs to design a distillation column for the separation of a mixture containing ethanol (boiling point of 78.4°C) and water. The desired composition of the distillate is a minimum of 90% ethanol. What is the minimum number of theoretical trays needed in the column to achieve this composition, given that the feed contains 40% ethanol and the reflux ratio is 1.5?

answered Jan 22 in Chemical engineering

1 answer 74 views

What is the product formed when an amine reacts with an acid anhydride? Write the balanced chemical equation for the reaction and name the product obtained.

asked Jan 21 in Organic Chemistry

1 answer 22 views

According to Seligman's learned helplessness theory, what is the cause of depression?

answered Jan 16 in Psychology

1 answer 21 views

What are the effects of gender stereotypes?

asked Jan 15 in Psychology

1 answer 34 views

What is overt observation?

answered Jan 15 in Psychology

1 answer 42 views

Who suggests that meaning-making in the grief process is important for psychological adjustment to loss?

asked Jan 15 in Psychology

1 answer 23 views

How do hearing impairments occur?

answered Jan 14 in Psychology

1 answer 24 views

What is an attitude?

answered Jan 14 in Psychology

1 answer 21 views

What is the relationship between depression and anxiety?

answered Jan 14 in Psychology

1 answer 33 views

Wind blown sand contributes to what type of erosion?

asked Jan 8 in Science

1 answer 23 views

What type of plants grow on other plants?

answered Jan 8 in Science

1 answer 23 views

What determines the strength of a base when dissolved in water?

asked Jan 6 in Science

1 answer 10 views

In 1802, charles and gay-lussac both proposed that for a fixed amount of gas at a constant pressure, what is directly proportional to its absolute temperature?

asked Dec 30, 2024 in Science

1 answer 24 views

Gene expression is regulated primarily at the what level?

asked Dec 30, 2024 in Science

1 answer 23 views

Amplitude describes what about the wave's crest and trough?

asked Dec 30, 2024 in Science

1 answer 20 views

Sepals, petals, stamens, and carpels are what kind of organs?

asked Dec 27, 2024 in Science

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