Which of the following is true of liquids and solids?

a. solids have a definite shape and volume whereas liquids have a definite volume but not a definite shape.
b. liquids have a definite shape and volume whereas solids have a definite shape but not a definite volume.
c. solids and liquids have a definite shape of tightly packed particles.
d. liquids have fixed particles and do not expand when heated whereas solids have flowing particles that do expand when heated.

A. Solids have a definite shape and volume whereas liquids have a definite volume but not a definite shape.

Explanation:

Solid state : It is a state in which the particles are closely packed and does not have any space between them. This state has a definite shape and volume.

Liquid state : It is a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. This state has a definite volume but does not have a fixed shape.

Gaseous state : It is a state in which the particles are loosely arranged and have a lot of space between them. This state has indefinite volume as well as shape.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.