Which of the following represents a type of change (physical or chemical) that is different from the rest? breaking a cracker in half grinding a cracker in a mixer biting on a cracker into smaller pieces digesting a cracker in the stomach

Answer is: Digesting a cracker in the stomach.

Digesting a cracker in the stomach is chemical change (chemical reaction), because new substances are formed , the atoms are rearranged and the reaction is followed by an energy change.

Other examples in this question are physical change, because state of matter and shape are changed.

Physical property can be observed and measured without any changes in molecular composition.

The same substance is present before and after the psysical change, just with different form or state of matter.  

sure what is it? ^w^

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