Why are polymers solid at room temperature when most smaller molecules are liquid or gas?

High density and molecular weight

Explanation:

Polymers are typically huge structures of smaller structures which are bonded to each other by covalent bonds. These smaller structures are also known as monomers. Since all of the monomers, typically thousands of monomers, are bonded together in one structure and not present as separate molecules or ions, this effect produces a close packed structure with a greater density similar to those seen in metals.

Due to high density and high molecular weight, polymers are solid as a result.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml