Which type of substance can conduct electricity in the liquid phase but not in the solid phase and why?
1) ionic compound
2) metallic compound
3) nonmetallic compound
4) molecular compound

ionic compound

Explanation:

In an ionic solid, all the ions are tightly held by electrostatic attraction with the neighbouring oppositely charged ion hence they are immobile. Electricity conduction by ionic substances depends on the mobility of ions. When dissolved in water, these ions are now pulled apart from each other and migrate freely. The same occurs when the crystal lattice collapses and the solid melts. Hence only the fused substance or the solution of the substance can conduct electricity.

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

16

explanation:

the marks go by 4s