Answer: -
Water can dissolve other substances. Which factor best contributes to this property of water?
d. Water particles are not fixed in place.
Explanation: -
When a substance like say common salt sodium chloride NaCl is dissolved in water, the water molecules surround the Na⁺ and Cl⁻ which result from dissolving of NaCl in water.
The water molecules by surrounding the Na⁺ and Cl⁻ help in dissolving NaCl.
Thus in order to surround them,the water molecules should not be fixed in their place and be free to move about.
Answer:
Two Half-lives
Explanation:
Let number of Parent nuclei Initially present be X,
Then, finally Parent nuclei Will remain with
daughter nuclei.
In one half- life , parent nuclei becomes half of initial.
So, starting with X parent nuclei,
After one half-life, it will degrade to .
After another half life , Parent nuclei will become half of
Which is equal to .
So, Parent nuclei have to go through Two half-lives.