8. Balance the Equation: H2O2 → __ H2O +
H2O + _O2
1->1+1
1->2+1
O
2->2+3
O
2->2+1

Must be negative.substance increases

Answerit is not a renewable energy source;

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.