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2 years ago

Write Democritus in your own words HELP ASAP

Chemistry

1 answer:

harina [27]2 years ago

7 0

Answer:

In explanation.

Explanation:

In the file attached is the answer, couldn´t answer it here.

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Suppose you are helping mccarthy choose her sample sites. you have the resources to conduct the study at only 4 sites. pick the

VARVARA [1.3K]

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3 years ago

The half-life of a radioactive isotope is the amount of time it takes for a quantity of that isotope to decay to one half of its

Sedaia [141]

Radio active decay reactions follow first order rate kinetics.

a) The half life and decay constant for radio active decay reactions are related by the equation:

$t_{\frac{1}{2}} =$ $\frac{ln 2}{k}$

$t_{\frac{1}{2}} = \frac{0.693}{k}$

Where k is the decay constant

b) Finding out the decay constant for the decay of C-14 isotope:

$Decay constant (k) = \frac{0.693}{t_{\frac{1}{2}}}$

$k = \frac{0.693}{5230 years}$

$k = 1.325 * 10^{-4} yr^{-1}$

c) Finding the age of the sample :

35 % of the radiocarbon is present currently.

The first order rate equation is,

$[A] = [A_{0}]e^{-kt}$

$\frac{[A]}{[A_{0}]} = e^{-kt}$

$\frac{35}{100} = e^{-(1.325 *10^{-4})t}$

$ln(0.35) = -(1.325 *10^{-4})(t)$

t = 7923 years

Therefore, age of the sample is 7923 years.

3 0

3 years ago

PLEASE HELP ITS DUE TODAY

dimulka [17.4K]

Answer:

2nd one and last one

Explanation:

im just that smart

8 0

3 years ago

Read 2 more answers

How many electrons should Nitrogen (N) have around its Lewis dot model?

Delvig [45]

Answer:

Explanation:

3 0

3 years ago

Sort each of the following elements by effective nuclear charge, Zeff, from smallest to largest:

krek1111 [17]

Answer:

Rb = +1 , Sr = +2, In= +3, Sn = +4, Sb= +5

Explanation:

Formula:

Zeff = Z - S

Z = atomic number

S = number of core shell or inner shell electrons

For Sn:

Electronic configuration:

Sn₅₀ = [Kr] 4d¹⁰ 5s² 5p²

Zeff = Z - S

Zeff = 50 - 46

Zeff = +4

For Rb:

Electronic configuration:

Rb₃₇ = [Kr] 5s¹

Zeff = Z - S

Zeff = 37 - 36

Zeff = +1

For Sb:

Electronic configuration:

Sb₅₁ = [Kr] 4d¹⁰ 5s² 5p³

Zeff = Z - S

Zeff = 51 - 46

Zeff = +5

For In:

Electronic configuration:

In₄₉ = [Kr] 4d¹⁰ 5s² 5p¹

Zeff = Z - S

Zeff = 49 - 46

Zeff = +3

For Sr:

Electronic configuration:

Sr₃₈= [Kr] 5s²

Zeff = Z - S

Zeff = 38 - 36

Zeff = +2

8 0

3 years ago