Which of the following is not an observable clue that a chemical reaction has occurred? a. release of a gas
b. color change
c. formation of a precipitate
d. mixing of the reactants

14 days is the half-life of phosphorus-32

the answer is c. nacl

i think its 100

i hope this !

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.