Answer:- 9.4 minutes.
Solution:- Radioactive decay obeys first order reaction kinetics and the equation used to solve this type of problems is:
where, k is decay constant and t is the time. 
is the initial amount of the radioactive substance and N is the remaining amount.
Since the value of decay constant is not given, so we need to calculate it first from given half life by using the formula:
where 
stands for half life.
Given half life is 3.0 minutes.
So, 
Let's plug in the values in the first order reaction equation and solve it for t.
It could also be written as:
k = 9.4 min
So, the radioactive substance would take 9.4 minutes to decay from 40.0 grams to 4.5 grams.
Chiral center is the center where all the attached substituents are different. For example, a carbon is said to be chiral carbon if it is attached to four different substituents.
The structure of threonine is attached here.
The marked carbons are chiral carbons because they have all the 4 different substituents.
Answer:
Below
Explanation:
This is a single replacement/displacement reaction! This is the "formula" for single replacement : A + BC = AC + B
The oxidation state is zero for Fe (s)
The organic nutrient stored in peanuts come from the peanut plants whereby peanut plants use sunlight to change inorganic matter into organic nutrients.
Option B is correct.
Inorganic matters are components of the soil as well as the CO₂ present in the soil. Thus, peanut plants use these inorganic matters together with the sunlight to carry out photosynthetic activities to manufacture food to the peanut plant so that the peanut plant can germinate, flower, and produce peanuts.
The process of the change of the inorganic matter to organic nutrients are as follows:
Peanut plants → peanuts → Peanut butter.
(inorganic material present) (organic nutrients) (processed peanuts)
Learn more about organic nutrients here:
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