A box spring.
Box Spring
yes
A split queen mattress is not as common as a split king sized mattress. A box spring for a queen bed can be purchased when the area for the bed is unreachable by the queen box spring in its original size.
When you are buying a bed there are two pieces. One is the box spring and the other mattress itself. You can use the mattress by itself but to be more comfortable you should get both pieces.
bed frame
Typically, a box spring is a combination of wood and steel springs that act like a shock absorber for a traditional spring mattress. a foundation is more of a solid structure , for use with a latex or memory foam mattress, it has been recommended that the foundation is used with the foam style mattress and the box springs purchased with the spring style mattress when buying a new set
Yes, they may not give a warranty with a new mattress however.
Yes, It's accually made the same.
Yes. We just did this three weeks ago in our 2002 Olds Silhouette. On an angle, box spring first, then mattress on top of that. Tight but no problem.
Technically yes, in the same sense that you can use a 4" plate for an 8" steak. A twin box spring is considerably smaller (slightly shorter and much narrower) than a queen mattress. The mattress will stick out nearly a foot on each side of the box spring, and a few inches at either the top or bottom (or both).
Yeshttp://www.perrysburgmattress.com/catalog/basics.php