Why is oxygen paramagnetic? - Chemistry Stack Exchange Paramagnetic molecules are molecules that have single electrons When I draw the lewis structure of $\\ce{O2}$, it appears to be a diamagnetic structure What makes it paramagnetic?
orbitals - What is the origin of the differences between the MO schemes . . . This phenomenon is explained by s-p mixing All the elements in the second period before oxygen have the difference in energy between the 2s and 2p orbital small enough, so that s-p mixing (combination) can occur lowering the energy of the σ (2s) and σ* (2s) and increasing the energy of the σ (2p) and σ* (2p) molecular orbitals By moving towards right in a period, the s orbital gets more
Enthalpy of the reaction between hydrogen and oxygen In this case, the enthalpy of $484\ \mathrm {kJ}$ is released when $2\ \mathrm {mol}$ of hydrogen gas react with $1\ \mathrm {mol}$ of oxygen gas to form $2\ \mathrm {mol}$ of gaseous water: $$\ce {2H2 (g) + O2 (g) -> 2H2O (g)}\qquad\Delta H^\circ = -484\ \mathrm {kJ}$$ (By way of comparison, the corresponding value for liquid water is about
Why do we call O2 oxygen? - Chemistry Stack Exchange Likewise $\ce {O2}$ is as much oxygen as atomic oxygen is The only complication is that what we habitually think of as oxygen is oxygen as a gas comprised of $\ce {O2}$ molecules Like Humpty Dumpty in Alice in Wonderland, "a word means what [we] choose it to mean" and often we have to add modifiers or alternate terms to avoid ambiguity
What explains the relative order of melting and boiling of oxygen and . . . 5 Why is the melting point of nitrogen ($\ce {N2}$) greater than that of oxygen ($\ce {O2}$)? After all, both are non-polar, and $\ce {O2}$ has more electrons than $\ce {N2}$ In addition, why is the boiling point of both opposite?