Which of the following materials is useful for making molds because it has a low melting point

Clay

Explanation:

Wood has higher thermal conductivity and it can be cooled easily and metal also posses high thermal conductivity and it also can be cooled easily.

The transformation of the wax can be very hard when it is present in the cooler climate conditions. It becomes hard because of the presence of lipid in it.

Clay is a soil material or natural rock which is finely grained . And the melting point of the clay is low by which it can be used for making molds.

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