These resources collect information on the most commonly encountered compounds and their most basic properties.
If you have trouble finding the chemical name, try using a synonym for that same compound. Or draw the structure of the compound you are looking for (NIST, ChemSpider).
If either of those don't succeed, try the add'l sources tab.
Both Wikipedia and Wolfram Alpha can be quick and easy to seach when it come to chemical and physical properties. Before you use these resources, consider the following:
There are many ways you can describe a compound in order to search for it within a database:
For example, consider ethanol:
Consider your options and what types of descriptions a particular database will accept.
If you get no results, try another synonym or another description, before moving on to another resource.