Yes this is normal. You may be interested by the info on this page
Google Chrome creates three different types of processes: browser, renderers, and plug-ins.
Browser. There's only one browser process, which manages the tabs, windows, and "chrome" of the browser. This process also handles all interactions with the disk, network, user input, and display, but it makes no attempt to parse or render any content from the web.
Plug-ins. The browser process also creates one process for each type of plug-in that is in use, such as Flash, Quicktime, or Adobe Reader. These processes just contain the plug-ins themselves, along with some glue code to let them interact with the browser and renderers.