Which of the following is equal to 4 kilograms?
a. 4,000 g
b. 4,000 mg
c. 40 g
d. 4,000 cg

First of all, you have to compare the two instances. So if 1000g makes 1kg. Then how many grammes will make 4kg

1000g=1kg

x=4kg.

   I represented the unknown with (x)

   So you make 1 multiply x and 4 multiply 1000

1x=1000x4

1x=4000

1x is the same as x. So

x=4000g

     Which is A. Hope I helped.

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