Which of the following is a chemical property of iron.
a) iron has a hardness of 4-5.
b) iron rusts when exposed to water and oxygen.
c) the melting point of iron is 1536 degrees celsius.
d) the boiling point of iron is 3000 degrees celsius.

clouds form

solid ice forms on leaves.

water droplets form on grass.

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