A-Gas is: 1. a superheated form of matter where electrons are ripped away from atoms creating this soupy form of matter
2. an intermediate state of matter that flows to the lowest point in a container and takes the shape of the container without changing volume
3. a state of matter with closely packed particles that CANNOT move about freely within the substance but have a stable volume and shape
4. a state of matter that has NO fixed shape or volume, has freely spaced particles with a lot of empty space between them giving it energy

The "right" answer is 4.  When matter is a gas, the particles flow freely, having no fixed shape or volume and contain a lot of extra space between particles.

However the last part, "...with a lot of empty space between them giving it energy" is (I'm fairly certain) incorrect.  The relationship is the other way.  Energy is added to the system, causing the particles to move more, thus building up the space between them.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.