Questions by Enmanuel Duran

Questions by Enmanuel Duran

An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21?

asked Apr 21, 2017

2 answers

5 votes

2.9k views

DNA samples should not be stored where

asked Apr 19, 2017

2 answers

4 votes

27.4k views

Find the non permissible replacement for y+3/y-1

asked Mar 27, 2017

2 answers

2 votes

148k views

1. How is the density of a substance calculated? 2. If the shape of an object is irregular, like a stone, how can you measure its volume? 3. If the volume of a cube of wood is15.625 cm3 and its mass is

asked Feb 8, 2017

1 answer

2 votes

159k views

Choose all the answers that apply. Mudslides can be caused by _____. earthquakes volcanoes tsunamis weathering

asked Feb 7, 2017

2 answers

2 votes

96.7k views

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