catalysis - What is HZSM-5? - Chemistry Stack Exchange
Jul 20, 2017 · 1 Answer. According to this article (1), the difference between the zeolites HZSM-5 and ZSM-5 is that the first has a monoclinic and the second has an orthorhombic framework. (1) H. van Koningsveld, J.C. Jansen, H. van Bekkum, The monoclinic framework structure of zeolite H-ZSM-5. Comparison with the orthorhombic framework of as-synthesized ZSM ...
What is a sacrificial agent? - Chemistry Stack Exchange
1 Answer. Sorted by: 3. "Sacrificial agent" usually refers to something variable, but with little value, that can be used to produce something specific or carry out a specific function. In this case, an alcohol (ethanol or glycerol) is sacrificed to act as a source of hydrogen gas, while the titanium species is a catalyst that is activated by ...
What are the maximum number of electrons in each shell?
Feb 20, 2014 · The 3d, 4d etc., can each hold ten electrons, because they each have five orbitals, and each orbital can hold two electrons (5*2=10). Thus, to find the number of electrons possible per shell. First, we look at the n=1 shell (the first shell). It has: The 1s orbital; An s-orbital holds 2 electrons. Thus n=1 shell can hold two electrons.
polarity - How can I tell if a molecule is polar or not? - Chemistry ...
Jul 16, 2015 · 1. Every sufficiently asymmetric molecule will be polar, but some more than others. The polarity of molecules is related to the polarity of bonds within the molecule, but just having polar bonds is not enough to create a polar molecule. Consider, for example, CCl 4 and CHCl 3.
Why does nitrogen have a maximum covalency of 4?
Feb 13, 2018 · Nitrogen has maximum covalency 4, because we know that maximum electrons a shell can accommodate is 2n2 2 n 2, and hence it can have only 8 electrons. So covalency cannot exceed more than 4. `. edited. Feb 13, 2018 at 11:09. BN SINGH.
How to calculate the total concentration after mixing two …
3M and 5M mean 3 mol/L and 5 mol/L i.e. the concentration. 20ml and 30ml are the volume. You said you were calculating the volume but you actually divided the concentration by the volume which gives mol/L/L. And you don't need to calculate any volumes since they are given, and you can add them to get the final volume.
Why should the temperature be maintained at 0–5 °C in a …
Jun 19, 2017 · In aqueous solution diazonium salts are unstable at temperatures above 5 °C (Ref: Wikipedia) At temperatures above 5 °C, diazonium salts (in aqueous solution) have been known to decompose, often explosively, to liberate nitrogen gas, temperatures too low however can cause crystallisation, which causes issues later on (diazonium salts should ...
How to calculate the amount of gas in a compressed cylinder
Apr 15, 2015 · The 9450 L 9 450 L is the total volume of standard pressure gas compressed into the cylinder to 20 MPa 20 M P a. Using V2 =V1/(p2/p1) V 2 = V 1 / (p 2 / p 1) having p1 = 0.101 MPa p 1 = 0.101 M P a, p2 = 20 MPa p 2 = 20 M P a, V1 = 9450 L V 1 = 9 450 L. The total volume of gas within the cylinder is about 47 L 47 L a reasonably fitting size for ...
physical chemistry - How do I calculate how much sodium …
Aug 18, 2015 · A 100 ml $\ce{HCl}$ solution has a pH of $3.7$. You want the solution to be of pH 4.5. You have a solution of $10\ \mathrm M$ $\ce{NaOH}$.
Why does ionization energy increase as we go from left to right in …
Apr 15, 2015 · 415 2 2 gold badges 5 5 silver badges 12 12 bronze badges $\endgroup$ 2