Is a 10 gallon aquarium big enough for a corn snake?

10 gallons means nothing - since this is an internationalsite, you would have been better listing the dimensions of the tank. Apart from that - an all-glass tank will waste energy - since 90 percent of the heat will escape straight through the glass !

The size of the vivarium should (on its longest side) be a minimum of half the adult snakes length ! Therefore - to allow the snake to move freely within the tank - it should be an absolute minimum of 36 inches long, 18 inches deep and 18 inches high !