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3 years ago

What was the result of the atomic theory?

1 answer:

5 0

Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. ... Dalton also postulated that chemical reactions resulted in the rearrangement of the reacting atoms.

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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

Textbook mass 2000 grams volume 4000cm3 density

PIT_PIT [208]

Density = mass/volume = 2000/4000 = 0.5 grams/cm3. Hope this hopes!

8 0

3 years ago

svp [43]

Answer: ph scale

Explanation:

7 0

2 years ago

5,6-dimethyl-2-heptyne <br><br> Due in 1 hr pls help me

mina [271]

Answer:

Please see the attached pictures.

Explanation:

☆ To ensure that each carbon has 4 bonds, fill the other bonds with Hs.

4 0

3 years ago

In which reaction is it possible for nitrogen to change into carbon?

sertanlavr [38]

C. ionization reaction...
THANKS!!

5 0

3 years ago