The half-life of any substance is the amount of time taken for half of the original quantity of the substance present to decay. The half-life of a radioactive substance is characteristic to itself, and it may be millions of years long or it may be just a few seconds.
In order to determine the half-life of a substance, we simply use:
t(1/2) = ln(2) / λ
Where λ is the decay constant for that specific isotope.
Answer:
- Shredded leaves
- Small bits of straw or hay, finely shredded
- Shredded paper
- Torn cardboard in small bits
Tip: The smaller the pieces, the faster it decomposes. Even fruits and veggies can decompose quickly if they are blended or chopped into small portions. If you add some worms to the compost pile, everything should decompose quickly! Just remember to avoid eggshells because they take FOREVER to decompose.
Answer:
c. Cr
Explanation:
The compound is containing 
ion.
If acid reacts with it, CO_2 evolves.
therefore, Cr would form a precipitate when added to an aqueous solution of this compound. Cr2CO3 is the precipitate.
Answer:
A) A solid salt dissolves in water.
Explanation:
A solid, like a salt, dissociates into ions as it dissolves in liquid. The particles (ions) become more spaced apart and with greater randomness. This is increasing entropy.
