Theo định nghĩa axit─bazơ của Bronstet, các chất và ion thuộc dãy nào dưới đây là trung tính? A. SO32-, Cl─ B. Na+, Cl─,
C. NH4+, HCO3-, CH3COO- D. HSO4-, NH4+, Na+

Answer is (d)a brainliest would be appreciated

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

Answer:

it was spontaneous.

explanation:

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.