No, the alcohol has now been turned into vinegar.
Vinegar of any type - white grain, cider, sherry, wine, etc - results from the oxidation of alcohol molecules. Acetic acid (vinegar) molecules are no longer ethyl alcohol molecules. I suppose some homemade vinegar which hadn't completed the oxidation could contain a minute amount of alcohol.
In most recipes, sherry would be appropriate. Often sherry vinegar is used in place of sherry by those who want to avoid alcohol. The exception might be when preparing a salad where the greater acidity of the vinegar is important.
If your sherry vinegar has lost its flavor, discard it and get some new sherry vinegar.
yes because it is a good substitute.
brown rice vinegar OR Chinese black vinegar (cheaper) OR red wine vinegar + sugar or honey OR sherry vinegar OR fruit vinegar
No, vinegar contains no wine and tastes very different than sherry.
Sherry is a fortified wine, usually brown in color. Wine vinegars are the result of bacterial action increasing the acidity in wine while lowering the alcohol content. Sherry vinegar is a type or sub-set of wine vinegar, often sweeter that most wine vinegars, started from Sherry wine. While other types of wine vinegar often show up in vinigrettes and salad dressing, due to its sweetness and stronger flavor, Sherry Vinegar does so rarely if at all. Other types of wine vinegars include red, white, champagne etc. Sherry vinegar is often used as a substitute for sweetened rice vinegar (Mirin).
Yes you may be able to use rice wine instead of dry sherry,most recipes when asking for dry sherry state either or can be used.
Red wine vinegar, if you have it.
Yes, if an acidic factor is all you are interested in. Sherry vinegar would be the next closest substitute but the taste of dry or sweet sherry for a sauce or marinade is fairly distinctive and to a discerning palate, quite noticable.
yes.
18-20% alcohol