What is the “observable physical properties of matter” meaning?

Explanation:

It means that you can see what is happening, either by just your eyes or a tool of some kind.

For example: water freezes at 0o C

CuSO4 is white.

Mass, weight, volume, density are considered measurable properties of matter.

Explanation:

I hope this helps, sorry if I'm wrong

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

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