Answer:There are total 118 elements in world as about marbale
Explanation:
1. “what forms of energy conversions occur during the process of photosynthesis? (How does energy transform?)
2. What is missing from the food web but is essential to maintain equilibrium?
A. Soil
B.water
C. Decomposers
D. Oxygen
Answer:
6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.
Explanation:
Using integrated rate law for first order kinetics as:
Where,
is the concentration at time t
is the initial concentration
Given:
Concentration is decreased to 1.56 % which means that 0.0156 of
is decomposed. So,
= 0.0156
Thus,
kt = 4.1604
The expression for the half life is:-
Half life = 15.0 hours
Where, k is rate constant
So,

<u>6 half-lives are required for the concentration of reactant to decrease to 1.56% of its original value.</u>
Noble gases
also known as Inert gases