Please someone help my test is timed.
What is litmus paper used for?

A.) To indicate if all the reactants have been used up

B.) To determine if a chemical reaction has occurred

C.) To determine pH

D.) To detect the presence of water

The anser choice is c ph because when you dip it in a substance it changes color due to the pH

Explanation:

The anser choice is c ph because when you dip it in a substance it changes color due to the pH

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

you gotta add the following molecules so we can give u an answer

explanation: