In the following reaction, indicate the oxidation numbers for all elements on BOTH sides of the equation. Which element is being oxidized in this reaction. Which
element is being reduced in the reaction?
2 Al + 6 HCl(aq) → 2AlCl3 (aq)
+ 3 H2(g)

There is no reason to think the results are biased or not conducted properly but you should not assume the results are correct just because they were done in a laboratory so the answer would be c. it is likely to be reliable because the results support the conclusion presented.

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.

Hello,#agreed with joseph002.i got my source also from  source: hope this