This is not a simple question, and it doesn't have a simple answer.
Some gloves are protective against certain chemicals, while others are almost useless.
The material that the glove is made from as well as the thickness of the glove determine its effectiveness. Various thickness' have different protection factors. Some gloves can be used for total immersion in a solvent for a specific period of time, while others can only withstand intermittent contact with chemicals, such as splashes. Factors such as flexibility, cut and tear resistance and temperature range need to be considered when selecting gloves. Anyone purchasing or planning to use gloves for protection should become familiar with the various protective materials which gloves are made and look at the glove selection charts for the suitability for the specific application.