Recent activity by CyrusG329117

1 answer 25 views

Calculate the standard enthalpy of formation of aluminum oxide from its elements given the following information:2 Al(s) + 3/2 O2(g) → Al2O3(s) ΔH°rxn = - 1675.7 kJ/molStandard enthalpy of formation of Al(s) = 0 kJ/molStandard enthalpy of formation of O2(g) = 0 kJ/mol

answered 1 day ago in ThermoChemistry

1 answer 55 views

What is the isomeric relationship between butane and 2-methylpropane? Draw the structures for each of the isomers and explain the difference in their physical properties.

asked 4 days ago in Organic Chemistry

1 answer 49 views

What is the concentration of iron(II) ions in a sample of water collected from a local pond using colorimetry, if the measured absorbance of the sample at 565 nm is 0.673 and the molar absorptivity of the iron(II) complex at this wavelength is 20,500 M⁻¹·cm⁻¹?

asked 6 days ago in Analytical Chemistry

1 answer 51 views

Calculate the mass of sodium chloride (NaCl) produced when 2.5 moles of sodium (Na) react completely with excess chlorine gas (Cl2). (Hint: Use the balanced chemical equation 2Na + Cl2 → 2NaCl)

answered Jan 23 in Chemical reactions

1 answer 22 views

According to the social identity theory, what is the basis of our self-concept?

answered Jan 20 in Psychology

1 answer 5 views

What is operationalisation in psychology research?

asked Jan 20 in Psychology

1 answer 3 views

Why is early identification of mental illness crucial?

answered Jan 17 in Psychology

1 answer 20 views

How has behavioural theory been criticised?

asked Jan 17 in Psychology

1 answer 29 views

Why is the positive psychology approach criticised?

answered Jan 16 in Psychology

1 answer 19 views

Who proposes that the grief process is influenced by societal expectations?

asked Jan 15 in Psychology

1 answer 5 views

Who was the first female president of the American Psychological Association?

asked Jan 13 in Psychology

1 answer 42 views

What molecules with a nitrogen base are the basic components of nucleic acids?

answered Jan 7 in Science

1 answer 47 views

The point in front of a mirror where the reflected rays intersect is known as what?

asked Jan 2 in Science

1 answer 44 views

The only obvious difference between boys and girls at birth is what type of organs?

answered Jan 2 in Science

1 answer 25 views

The mixture of gases that surrounds the planet and makes up the atmosphere is known as ________.

asked Jan 2 in Science

1 answer 55 views

Sedimentary rocks form in what kind of layers?

answered Dec 31, 2024 in Science

1 answer 31 views

Quantities have two parts: the number (how many) and what else?

answered Dec 31, 2024 in Science

1 answer 15 views

Most turtle bodies are covered by a special bony or cartilaginous shell developed from their what?

asked Dec 31, 2024 in Science

1 answer 23 views

Desert plants have evolved processes to conserve water and deal with harsh conditions. a more efficient use of co2 allows plants to adapt to living with what?

asked Dec 30, 2024 in Science

1 answer 26 views

Chemical and physical changes in a system may be accompanied by an increase or a decrease in the disorder of the system, corresponding to an increase or decrease in what?

answered Dec 30, 2024 in Science

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