In a small bowl, thoroughly blend soy sauce, vegetable oil, Worcestershire sauce, lemon juice, brown sugar, garlic and ketchup. Divide sauce in half placing in two separate containers. Place pork chops in a medium baking dish, spread with 1/2 the sauce and let marinate for at least 1 hour.
Cover with aluminium foil and bake pork chops 30 minutes in the preheated oven. Turn and spread with remaining sauce. Continue baking 25 minutes, or until internal temperature of the chops has reached 160 degrees F (70 degrees C). Remove foil and broil 3 minutes.