The U.S. has vast reserves of natural gas that are commercially viable as a result of advances in horizontal drilling and hydraulic fracturing technologies enabling greater access to gas in shale formations.
Yes, you can open the Keflex capsule and take the contents. However, that way you may miss some of the dose if all the contents of what you mixed it in don't get eaten. And the taste of the antibiotic powder may not be so nice.
If you cannot swallow the delayed-release capsules whole, you can open the capsules and mix the contents with a small amount of a soft, acidic food such as applesauce. You may be able to mix the capsule contents with certain other foods. Ask your doctor or pharmacist for more information.