N Q2. A student added excess zinc metal to nitric acid. A gas also formed as a result
a Name the salt formed
b. How the excess metal can be removed
c. Name the gas formed
d. Give a test to identify the gas produced

Alpha particles have positive charge, beta particles have negative charge, and answer 4 just doesn’t make sense. thus, you are left with only one possible answer.

Thermohaline circulation and gyres

50? i have no !

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.