4.36.3 Can you answer these questions?

4.36.3.1 Vertically Centering a section title

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=454870

How can I center a the section title "Summary Sheet" Vertically? 
\documentclass[11pt,a4paper,titlepage]{article} 
\usepackage{lipsum} 
\usepackage{graphicx} 
\usepackage[a4paper,margin=1.0in]{geometry} 
... 
[vertical-alignment] [titles]
 

asked by Omar https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=154853 1 vote

4.36.3.2 Weird vertical spacing when using `semantic` with `setspace`

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=454950

I'm writing my dissertation, which needs to be double spaced. There seems to be some issue with semantic inference rules in the presence of \doublespacing. When the rule has only one antecedent, the  ... 
[spacing] [setspace]
 

asked by Fidget324 https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=172301 1 vote

4.36.3.3 \chemleft bracket too far from molecule

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=454914

I am trying to draw a reaction scheme in chemfig, but the chemleft bracket is too far away from the actual molecule and I do not know why. My code looks like this: 
\documentclass{article} 
... 
[tikz-pgf] [chemfig]
 

asked by sab hoque https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=166730 1 vote