A fact can be disapproved with further evidence different details. So basically evidence can change a fact!! Hope this helps
The answers would be the mass before a reaction is the same as the mass after a reaction which basically means mass is conserved
The answer will be apart of a 60 caculace so it will equal to a efficacy amount so d
Answer:
The half-life of a radioisotope describes the amount of time it takes for said isotope to decay to one-half the original amount present in the sample.
Nitrogen-13, because it has a half-life of ten minutes, will experience two half-lives over the course of the twenty minute period. This means that 25% of the isotope will remain after this.
0.25 x 128mg = 32mg
32mg of Nitrogen-13 will remain after 20 minutes.
