Top new questions this week:
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We recently bought a home and found about 2 litres of hydrochloric acid 20% (also known as muriatic acid) that was used to manage acidity in a swimming pool that no longer exists. I would like to …
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A machine has overheated in an air filled enclosure, and a major brass component of mass around 1kg turned black. It was probably not in the high temperature regime for more than 2 hours at a guess …
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I know that this question has many other variations on this site, but I’m trying to see if I understood Helmholtz and Gibbs energy properly or not. The material I’m reading from is Physical chemistry …
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I am working through a problem set from MIT’s open courseware course Principles of Chemical Science. The question is: Phosgene $\ce{(COCl2)}$ is a chemical warfare agent that decomposes by the …
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Cold welding is the process of joining metals using pristine surfaces without contaminents(oxide layers, oil, dust…) using pressure through atomic diffusion between the metal joints. Why does this …
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During a lecture, my professor said that sublimation at atmospheric pressure (1 atm), as a purification/separation technique, can be performed when the sublimating substance has a triple point falling …
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NaOH in water becomes $\ce{Na+}$ and $\ce{OH-}$ ions. If it’s a Bronsted Lowry base then the $\ce{OH-}$ ions will take $\ce{H+}$. But FROM where exactly – from the water molecules or from the …
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Greatest hits from previous weeks:
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Was looking at Henry’s law and Raoult’s law constants and there seemto be lots of equations involved. Henry’s law involves partial pressure and the latter involves the vapor pressure. Wondering what …
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Is the melting and boiling point of ionic bond usually higher than covalent bond? I know that compounds with ionic bonds are usually solid at room temperature, so I want other answers than this. (…
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I know that solubility of alkaline earth metal hydroxides increases down the group and solubility of alkaline earth metal sulfates decreases down the group. What is the reason for these trends?
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I always have trouble naming my graphs in class. They never seem too scientific or professional. For example, we are reviewing density now, and had to graph the mass (Y) of different volumes (X) of …
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This is a 10th-grade question. The melting point of a substance decreases with increase in presence of impurities in it. The melting point of ice decreases from 0 °C to -22 °C on mixing salt in it …
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During the formation of a molecule of water ($\ce{H2O}$), what kind of bond occurs between the elements? I’m studying this subject on my own and from some sources I saw that there is a covalent bond …
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If one considers boiling points (in °C) of primary alcohols, one finds the following: methanol: 65 ethanol: 79 1-propanol: 97 1-butanol: 117 1-pentanol: 138 This trend is due to Van der Waals forces …
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Can you answer these questions?
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I have read some papers that say that a Kohn anomaly mode is a particular feature of 2H- transition metal dichalcogenides and that the existence of such a mode can be seen in neutron scattering data …
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I am looking for the absorption spectrum of linear polyenes (1,3,5-hexatriene, 1,3,5,7-Octatetraene, 1,3,5,7,9-decapentaene, etc..) in the range of UV and Visible light wavelength. I see the data at …
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Should the local coupling constant g not be without a unit, as the Holstein Hamiltonian suggests? $ H=\underbrace{\sum_{P, Q} h_{P Q}^{(0)} a_P^{\dagger} a_Q}_{\text{Fixed geometry}}+\underbrace{\sum_{…
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