Why is it called the periodic table of elements (why is the word periodic in it)
1 answer:
Answer:
It is called "periodic" because elements are lined up in cycles or periods. From left to right elements are lined up in rows based on their atomic number (the number of protons in their nucleus). ... Each horizontal row in the table is a period. There are seven (or eight) total periods.
Explanation:
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Explanation:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
Half life for second order kinetics is given by:
k = rate constant =?
= initial concentration
a = concentration left after time t
Integrated rate law for second order kinetics is given by:
a) Initial concentration of XY =
Rate constant of the reaction = k =
Half life of the reaction is:
1,436.78 seconds is the half-life for this reaction.
b) Initial concentration of XY = 0.100 M
Final concentration after time t = 12.5% of 0.100 M = 0.0125 M
Solving for t;
t = 10,057.47 seconds
In 10,057.47 seconds the concentration of XY will become 12.5% of its initial concentration.
c) Initial concentration of XY = 0.200 M
Final concentration after time t = 12.5% of 0.200 M = 0.025 M
Solving for t;
t = 5,028.73 seconds
In 5,028.73 seconds the concentration of XY will become 12.5% of its initial concentration.
d) Initial concentration of XY = 0.160 M
Final concentration after time t =
Solving for t;
t = 1,419.40 seconds
In 1,419.40 seconds the concentration of XY will become .
e) Initial concentration of
Final concentration after time t = x
t = 55.0 s
Solving for x;
x = 0.04906 M
The concentration after 55.0 seconds is 0.04906 M.
f) Initial concentration of XY= 0.050 M
Final concentration after time t = x
t = 500 s
Solving for x;
x = 0.04259 M
The concentration after 500 seconds is 0.0.04259 M.