Which of these are caused by electric force? Check all that are true. Two charged balloons pushing away from each other. Wind blowing a balloon. A car rolling down a hill toward another car. A sock stuck to a towel because of charged particles.

D. h2o + h2o > h3o + oh- confirmed.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

4.49 gramshope that fren : )