Why is there weightlessness in space?

Because there is no gravity in space or at least nothing compared to earth's gravitational pull.

Because there is no gravity in space. In space your so far away from Earth so gravity doesn't pull you to the ground, so you float.

Hope this helps :)

maybe because its impossible for balloons to lift a whole entire house.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.